All Developer Tools

The complete index of all 275 free developer tools on ThisDevTool, organized into 26 categories. Every tool runs entirely in your browser - instant, private, and no signup required.

API Tools 7

• cURL to Code Converter — Convert cURL commands to Python, JavaScript, Go, PHP, and more.
• API Mock Generator — Generate realistic mock API data with faker patterns and schema-based generation.
• GraphQL Query Builder — Build GraphQL queries, mutations, and subscriptions with visual field selection.
• OpenAPI Spec Viewer — Parse and display OpenAPI 3.x specs with endpoint browsing and analysis.
• Browser Feature Detector — Test 40+ Web API support: WebGL, WebGPU, Service Workers, WebRTC, and more.
• JWT to OpenAPI Schema — Paste a decoded JWT JSON payload and generate an OpenAPI 3.0 Schema Object or JSON Schema. Type inference for all claim types.
• HTTP Status Code Reference — Complete reference for all HTTP status codes with descriptions and use cases.

CSS & Design Tools 15

• Color Palette Generator — Generate harmonious color palettes. Export as CSS, Tailwind, or SCSS.
• CSS Gradient Generator — Build linear, radial, conic, and repeating CSS gradients with presets.
• CSS Grid Generator — Visual CSS Grid builder with interactive cells, gap controls, and template areas.
• Flexbox Playground — Interactive Flexbox playground with visual item controls and CSS output.
• Typography Scale — Generate a modular type scale. Preview sizes and export as CSS.
• Box Shadow Editor — Design layered box shadows with sliders, presets, and live preview.
• CSS Animation Builder — Build @keyframes animations with timeline editor and preset effects.
• Glassmorphism Generator — Create frosted glass UI effects with backdrop-filter and live preview.
• Color Contrast Checker — Check foreground/background color contrast against WCAG AA and AAA standards.
• Color Converter — Convert between HEX, RGB, HSL, HSV, CMYK with harmonies and color blindness sim.
• SVG Optimizer — Optimize and minify SVG files by removing metadata, comments, and redundant data.
• CSS Clip Path Editor — Create clip-path shapes: circle, polygon, inset, and custom paths.
• CSS Filter Playground — Adjust blur, brightness, contrast, grayscale, and more with live preview.
• Font Pairing Suggester — Browse curated font pairs, preview layouts, and export CSS font declarations.
• Tailwind to CSS Converter — Convert Tailwind CSS utility classes to vanilla CSS with responsive and state handling.

Encoding & Decoding Tools 18

• Base64 Encoder/Decoder — Encode text to Base64 or decode Base64 strings instantly.
• URL Encoder/Decoder — Encode and decode URLs and URL components instantly.
• HTML Entity Encoder/Decoder — Encode and decode HTML entities including named and numeric references.
• Hex ↔ ASCII Converter — Convert between hexadecimal and ASCII text with multiple formats.
• Binary ↔ Text Converter — Convert text to binary representation and binary back to text.
• Number Base Converter — Convert between binary, octal, decimal, and hexadecimal number systems.
• String Escape/Unescape — Escape and unescape strings for JSON, HTML, URL, SQL, Regex, and CSV.
• Punycode / IDN Converter — Convert internationalized domain names between Unicode and Punycode (xn--).
• Base32/58/85 Encoder — Encode and decode Base32, Base58, Base85 (Ascii85), and Base62 formats.
• Data URL Creator — Convert files and text to data: URIs (Base64) and reverse.
• Image to Base64 — Convert images to Base64 data URIs with preview and CSS background output.
• Base64 to Image — Convert Base64 strings back to downloadable images with format detection.
• XSS Payload Encoder — Encode payloads for security testing: HTML entities, URL, Base64, Unicode escapes.
• Zero-Width Encoder — Hide secret messages inside text using zero-width Unicode characters.
• IP Address Converter — Convert between IPv4, IPv6, decimal, and binary IP representations.
• Morse Code Translator — Translate text to Morse code and back with audio playback via Web Audio API.
• SSL Certificate Decoder — Decode PEM X.509 certificates and display subject, issuer, and validity.
• Basic Auth Header Generator — Generate and decode HTTP Basic Auth headers. Get the Authorization value, cURL command, fetch, and Python snippets.

Format Tools 10

• JSON Formatter — Format, validate, and minify JSON. Syntax highlighting with error detection.
• SQL Formatter — Format and beautify SQL queries with keyword uppercasing and indentation.
• CSS Minifier & Beautifier — Minify or beautify CSS with size comparison and compression stats.
• JavaScript Minifier & Beautifier — Minify or beautify JavaScript code with size reduction stats.
• HTML Minifier & Beautifier — Minify or beautify HTML markup with comment removal options.
• XML Formatter & Validator — Format, validate, and minify XML with error detection.
• Line Number Tool — Add or remove line numbers with configurable format, padding, and start number.
• IBAN Validator & Formatter — Validate IBANs with ISO 13616 mod-97 checksum. Format with spaces, extract BBAN, bank code, country.
• E.164 Phone Formatter — Format messy phone numbers to E.164 standard (+1234567890). Country code selector, batch mode, and reference table.
• Image Format Converter — Convert images between PNG, JPEG, and WebP formats with quality control.

Free Accessibility Tools 2

• Color Contrast Checker — Check foreground/background color contrast against WCAG AA and AAA standards.
• WCAG Palette Generator — Generate accessible color palettes that pass WCAG contrast requirements.

Free Cipher Tools 15

• Enigma Machine Simulator — Authentic WWII Enigma M3 - Rotors I - V, Reflectors B/C, plugboard, double-step anomaly.
• Polybius Square Cipher — Encode text to row/column coordinate pairs using the classic 5×5 Polybius grid.
• Baconian Cipher — Map letters to 5-bit A/B sequences - Francis Bacon's 1605 steganographic cipher.
• Playfair Cipher — Digraph substitution with a 5×5 keyword square. Encrypt and decrypt paired letters.
• ADFGVX Cipher — WWI fractionating cipher - 6×6 Polybius square substitution + columnar transposition.
• Tap Code — Prison wall cipher used by Vietnam War POWs. 5×5 grid, audio tap playback.
• Rail Fence Cipher — Zig-zag transposition cipher with visual rail display. Choose 2 - 10 rails.
• Columnar Transposition — Write in rows, read columns by keyword alphabetical order - keyword permutation cipher.
• One-Time Pad (OTP) — XOR perfect secrecy. Generate cryptographically secure random keys. Encrypt and decrypt.
• Dancing Men Cipher — Encode and decode messages using the Sherlock Holmes stick-figure alphabet. Flags mark word boundaries. SVG stick figures for every letter.
• T9 Phone Decoder — Encode text to old-school multi-tap SMS keypad sequences and decode them back. 44 33 555 555 666 = HELLO. Visual keypad included.
• Vanity Phone Number Converter — Convert vanity phone numbers like 1-800-FLOWERS to dialable digits via ITU E.161 keypad mapping. Reverse lookup finds words in numbers.
• Scytale Cipher — Ancient Spartan cylinder transposition cipher. Set the diameter, encrypt or decrypt, and visualize the column grid.
• Baudot / ITA2 Code Decoder — Encode and decode text using 5-bit ITA2 teletype code with Letters/Figures shift states. Render as punched paper tape.
• Letters to Numbers (A1Z26) — A=1, B=2...Z=26 cipher. Encode, decode, reverse (Z=1), custom offset, and sum mode. Used in Gravity Falls and escape rooms.

Free Code Generation Tools 7

• JSON to TypeScript — Convert JSON data to TypeScript interfaces, type aliases, or readonly types.
• JSON to Go Struct — Convert JSON to Go structs with json tags and proper Go naming.
• JSON to Python Dataclass — Convert JSON to Python dataclasses, TypedDict, or Pydantic models.
• JSON to C# Classes — Convert JSON to C# classes, records, or JsonProperty-annotated models.
• JSON to Java Classes — Convert JSON to Java POJOs, Lombok classes, or Java 16+ records.
• JSON to Rust Structs — Convert JSON to Rust structs with serde Serialize/Deserialize derives.
• cURL to Code Converter — Convert cURL commands to Python, JavaScript, Go, PHP, and more.

Free Cryptography Tools 16

• Hash Generator — Generate SHA-256, SHA-384, SHA-512, and SHA-1 hashes using Web Crypto API.
• ROT13 / ROTn Cipher — Apply ROT13, ROT5, ROT47, or custom rotation ciphers to text.
• Caesar Cipher — Encrypt/decrypt with Caesar cipher. Brute force mode with frequency analysis.
• AES Encryption — Encrypt and decrypt text with AES-256-GCM using Web Crypto API and PBKDF2.
• RSA Key Generator — Generate RSA key pairs (2048/4096-bit) and export as PEM via Web Crypto API.
• HMAC Generator — Generate HMAC signatures using SHA-256/384/512 via Web Crypto API.
• File Checksum Verifier — Calculate and verify SHA-256/SHA-1/SHA-512 file checksums in your browser.
• Password Hasher (PBKDF2) — Hash and verify passwords using PBKDF2-SHA256 with configurable iterations.
• Text Hash Compare — Hash two texts with SHA-256/512/SHA-1 and compare results side by side.
• Hash Identifier — Identify hash types (MD5, SHA-1, SHA-256, bcrypt, etc.) from pasted hash strings.
• BIP39 Mnemonic Generator — Generate 12-24 word cryptocurrency recovery phrases with entropy and checksum validation.
• Clock Code Decoder — Decode messages hidden in clock face positions with visual display.
• Colored Squares Cipher — Map hex colors to alphabet characters and render as visual blocks.
• Five-Needle Telegraph — Victorian Cooke & Wheatstone 5-needle telegraph simulator.
• Slash-and-Pipe Encoder — Encode binary as ASCII art using slashes and pipe characters.
• Gallifreyan Symbol Generator — Generate Doctor Who circular Gallifreyan text via SVG rendering.

Free DevOps Tools 8

• Nginx Config Generator — Generate Nginx configs for reverse proxy, static sites, SSL, and load balancing.
• .htaccess Generator — Generate .htaccess rules for redirects, security, performance, and rewrites.
• Docker Compose Builder — Build docker-compose.yml with visual service cards, volumes, and templates.
• Dockerfile Builder — Generate Dockerfiles with language presets, multi-stage builds, and best practices.
• SSH Config Builder — Build ~/.ssh/config with host entries, proxy jumps, and cloud templates.
• GitHub Actions Builder — Generate CI/CD workflow YAML for Node.js, Python, Docker, and custom pipelines.
• Systemd Service Builder — Generate systemd .service and .timer unit files with presets and install commands.
• .env Template Builder — Parse .env files to generate .env.example with redacted secrets and comments.

Free Fun & Esoteric Tools 10

• Dancing Men Cipher — Encode and decode messages using the Sherlock Holmes stick-figure alphabet. Flags mark word boundaries. SVG stick figures for every letter.
• T9 Phone Decoder — Encode text to old-school multi-tap SMS keypad sequences and decode them back. 44 33 555 555 666 = HELLO. Visual keypad included.
• Vanity Phone Number Converter — Convert vanity phone numbers like 1-800-FLOWERS to dialable digits via ITU E.161 keypad mapping. Reverse lookup finds words in numbers.
• Scytale Cipher — Ancient Spartan cylinder transposition cipher. Set the diameter, encrypt or decrypt, and visualize the column grid.
• Baudot / ITA2 Code Decoder — Encode and decode text using 5-bit ITA2 teletype code with Letters/Figures shift states. Render as punched paper tape.
• Letters to Numbers (A1Z26) — A=1, B=2...Z=26 cipher. Encode, decode, reverse (Z=1), custom offset, and sum mode. Used in Gravity Falls and escape rooms.
• Pig Latin Translator — Translate English to Pig Latin and back. Handles consonant clusters, vowel-start words, capitalisation, and hyphenated words.
• DNA Sequence Encoder — Encode text to DNA codon sequences (A/C/T/G) and decode them back. Translate codons to amino acids using the standard genetic code table.
• Resistor Color Code Calculator — Decode 4/5/6-band resistor color codes to resistance values or find bands for any value. Visual resistor diagram. Tolerance and TC support.
• Periodic Table Word Speller — Can you spell a word using only element symbols from the periodic table? Ba+C+O+N = BACON. Backtracking algorithm finds all valid spellings.

Free Network Tools 14

• Subnet Calculator — Calculate CIDR subnets: network, broadcast, host range, and subnet splitting.
• DNS Record Builder — Construct A, AAAA, CNAME, MX, TXT, SRV, and NS records in BIND format.
• HTTP Status Codes — Searchable reference of all HTTP status codes (1xx-5xx) with descriptions.
• HTTP Header Inspector — Parse and explain HTTP headers with security scoring and builder mode.
• User Agent Parser — Parse User-Agent strings to extract browser, OS, device, and engine info.
• MIME Type Lookup — Look up MIME types by file extension or find extensions by MIME type.
• IP Address Converter — Convert between IPv4, IPv6, decimal, and binary IP representations.
• URL Parser — Break down URLs into protocol, host, path, query params, and hash components.
• HTTP Methods Reference — Complete HTTP method reference: GET, POST, PUT, DELETE with examples and properties.
• MAC Address Generator — Generate random or vendor-prefixed MAC addresses. Colon, hyphen, and Cisco dot formats. Bulk & validate.
• Random Port Generator — Generate random ephemeral ports (1024-65535) with well-known port exclusion. Bulk, range, and reference modes.
• IPv6 ULA Generator — Generate RFC 4193 Unique Local Addresses (fd00::/8). Create /48 prefixes, list /64 subnets, validate ULA addresses.
• DNS over HTTPS Lookup — Query A, AAAA, MX, TXT, CNAME, NS records via Cloudflare 1.1.1.1 and Google 8.8.8.8 DoH resolvers. Batch mode and CSV export.
• HTTP Status Code Reference — Complete reference for all HTTP status codes with descriptions and use cases.

Free Online CSS & Design Tools 10

• CSS Grid Generator — Visual CSS Grid builder with interactive cells, gap controls, and template areas.
• Flexbox Playground — Interactive Flexbox playground with visual item controls and CSS output.
• CSS Gradient Generator — Build linear, radial, conic, and repeating CSS gradients with presets.
• Box Shadow Editor — Design layered box shadows with sliders, presets, and live preview.
• Glassmorphism Generator — Create frosted glass UI effects with backdrop-filter and live preview.
• CSS Animation Builder — Build @keyframes animations with timeline editor and preset effects.
• Image Color Picker — Pick colors from images with magnifier, palette extraction, and HEX/RGB/HSL output.
• Tailwind to CSS Converter — Convert Tailwind CSS utility classes to vanilla CSS with responsive and state handling.
• SVG Optimizer — Optimize and minify SVG files by removing metadata, comments, and redundant data.
• CSS Clip Path Editor — Create clip-path shapes: circle, polygon, inset, and custom paths.

Free Online JSON Tools 10

• JSON Formatter — Format, validate, and minify JSON. Syntax highlighting with error detection.
• JSON Schema Generator — Infer JSON Schema from sample data. Supports Draft-07 and Draft-04.
• JSONPath Evaluator — Test JSONPath expressions against JSON data with highlighted matches.
• JSON to TypeScript — Convert JSON data to TypeScript interfaces, type aliases, or readonly types.
• JSON to Go Struct — Convert JSON to Go structs with json tags and proper Go naming.
• JSON to Python Dataclass — Convert JSON to Python dataclasses, TypedDict, or Pydantic models.
• JSON to C# Classes — Convert JSON to C# classes, records, or JsonProperty-annotated models.
• JSON to Java Classes — Convert JSON to Java POJOs, Lombok classes, or Java 16+ records.
• JSON to Rust Structs — Convert JSON to Rust structs with serde Serialize/Deserialize derives.
• JSON Size Analyzer — Analyze JSON size by key with treemap visualization and optimization tips.

Free Online Math Tools 6

• Prime Number Tester — Test if any number is prime using trial division and Miller-Rabin. Find next/previous prime. Factorize.
• Fibonacci Generator — Generate Fibonacci sequences, compute any Nth term with BigInt precision, and explore golden ratio convergence.
• Digital Root Calculator — Calculate the digital root of any number with step-by-step reduction. O(1) shortcut formula and batch mode.
• Fraction Approximator — Convert any decimal to its closest fraction using continued fractions. Shows convergents and approximation error.
• Clock Angle Calculator — Calculate the angle between clock hands at any time. Shows acute and reflex angles with a visual clock face and quiz mode.
• Golden Ratio Calculator — Apply Phi (1.618) to any dimension. Get the golden pair, visualize the Fibonacci spiral, and explore design applications.

Free Online Security & Crypto Tools 10

• AES Encryption — Encrypt and decrypt text with AES-256-GCM using Web Crypto API and PBKDF2.
• RSA Key Generator — Generate RSA key pairs (2048/4096-bit) and export as PEM via Web Crypto API.
• HMAC Generator — Generate HMAC signatures using SHA-256/384/512 via Web Crypto API.
• Password Hasher (PBKDF2) — Hash and verify passwords using PBKDF2-SHA256 with configurable iterations.
• JWT Builder — Construct JWT tokens with custom claims, timestamps, and header options.
• SSL Certificate Decoder — Decode PEM X.509 certificates and display subject, issuer, and validity.
• CSP Builder — Build Content Security Policy headers with directive form and strictness rating.
• CORS Headers Builder — Generate CORS headers with code snippets for Express, Nginx, Apache, and Flask.
• SRI Hash Generator — Generate SHA-256, SHA-384, and SHA-512 Subresource Integrity hashes for scripts and stylesheets.
• Hash Generator — Generate SHA-256, SHA-384, SHA-512, and SHA-1 hashes using Web Crypto API.

Free Online SEO Tools 13

• Meta Tag Generator — Generate SEO-optimized meta tags with title, description, and OG tags.
• Schema JSON-LD Generator — Generate FAQ, HowTo, Article, Product, and LocalBusiness structured data.
• SERP Preview — Preview how your page will look in Google search results.
• Robots.txt Generator — Generate and validate robots.txt files for search engine crawlers.
• OG / Twitter Card Preview — Preview how your links look when shared on social media.
• UTM Bulk Builder — Generate tracked UTM URLs in bulk for marketing campaigns.
• Canonical Tag Checker — Check if a URL has a canonical tag and whether it points to itself.
• Hreflang Tag Builder — Generate hreflang tags for multi-language and multi-region sites.
• Slug Normalizer — Clean and normalize URL slugs in bulk. Handles special characters.
• Backlink Profile Dashboard — Import CSV backlink data to visualize domain authority distribution and top referring domains.
• Voice Search Suggester — Generate long-tail keyword matrices with question words and prepositions for voice search SEO.
• AMP HTML Validator — Validate AMP HTML by checking for banned tags, required elements, and custom JS restrictions.
• Social Share Preview — Preview how links appear on Facebook, Twitter/X, LinkedIn, Discord, and Slack.

Generator Tools 15

• Password Generator — Generate strong passwords with a strength meter. Customizable length and chars.
• UUID Generator — Generate v4 UUIDs instantly. Bulk generate up to 100 at a time.
• QR Code Generator — Generate and decode QR codes. Download as PNG or SVG.
• Barcode Generator — Generate Code 128, EAN-13, UPC-A, and Code 39 barcodes as PNG or SVG.
• Fake Data Generator — Generate realistic test data as JSON, CSV, or SQL INSERT statements.
• Favicon Generator — Generate a full favicon pack (ICO, PNG, Apple Touch) from any image.
• Email Signature Generator — Create professional HTML email signatures with social links and images.
• Color Palette Generator — Generate harmonious color palettes. Export as CSS, Tailwind, or SCSS.
• Slug Generator — Generate clean URL slugs from any text. Handles accents and special chars.
• RSA Key Generator — Generate RSA key pairs (2048/4096-bit) and export as PEM via Web Crypto API.
• Placeholder Image Generator — Generate solid, gradient, or patterned placeholder images. Download as PNG.
• Random Number Generator — Cryptographic RNG with dice roller, coin flipper, lottery picker, and histogram.
• Random Name Generator — Generate random names, words, sentences, and paragraphs from built-in databases.
• ULID Generator — Generate Universally Unique Lexicographically Sortable Identifiers with Crockford Base32 encoding.
• MAC Address Generator — Generate random or vendor-prefixed MAC addresses. Colon, hyphen, and Cisco dot formats. Bulk & validate.

Image Tools 9

• Image Color Picker — Pick colors from images with magnifier, palette extraction, and HEX/RGB/HSL output.
• Placeholder Image Generator — Generate solid, gradient, or patterned placeholder images. Download as PNG.
• Dockerfile Builder — Generate Dockerfiles with language presets, multi-stage builds, and best practices.
• Image to Base64 — Convert images to Base64 data URIs with preview and CSS background output.
• Base64 to Image — Convert Base64 strings back to downloadable images with format detection.
• Emoji to PNG — Render any emoji as PNG at custom sizes (16-512px) with background options.
• Color Palette Extractor — Drop any image to extract its dominant colors using K-Means clustering. Get hex, RGB, and CSS variables.
• Image Resizer & Compressor — Resize and compress images in your browser. Adjust dimensions, quality, and format.
• Image Format Converter — Convert images between PNG, JPEG, and WebP formats with quality control.

Markdown Tools 9

• Markdown Preview — Write Markdown and see a live rendered preview side-by-side.
• HTML ↔ Markdown — Convert HTML to Markdown or Markdown to HTML instantly.
• Markdown Table Builder — Build markdown tables visually. Add rows, columns, and alignment.
• README.md Generator — Generate README.md templates with badges, sections, and live markdown preview.
• JSON to Markdown Table — Convert JSON arrays, objects, or CSV to formatted Markdown tables with alignment.
• Markdown to Slides — Convert Markdown to navigable slide presentations with fullscreen mode.
• HTML to Plain Text — Extract readable text from HTML. Preserve links as Markdown or convert full HTML to Markdown.
• Markdown to Plain Text — Strip markdown syntax while preserving readable text content.
• Markdown to PDF — Convert Markdown to a styled HTML preview and export as PDF.

Minify Code & Files 6

• JSON Formatter — Format, validate, and minify JSON. Syntax highlighting with error detection.
• CSS Minifier & Beautifier — Minify or beautify CSS with size comparison and compression stats.
• JavaScript Minifier & Beautifier — Minify or beautify JavaScript code with size reduction stats.
• HTML Minifier & Beautifier — Minify or beautify HTML markup with comment removal options.
• XML Formatter & Validator — Format, validate, and minify XML with error detection.
• SVG Optimizer — Optimize and minify SVG files by removing metadata, comments, and redundant data.

Preview Tools for Developers 8

• Markdown Preview — Write Markdown and see a live rendered preview side-by-side.
• SERP Preview — Preview how your page will look in Google search results.
• OG / Twitter Card Preview — Preview how your links look when shared on social media.
• Responsive Design Tester — Preview HTML at different viewport sizes with device presets and side-by-side mode.
• Base64 to Image — Convert Base64 strings back to downloadable images with format detection.
• Web-Safe Fonts Preview — Preview 20+ web-safe fonts with adjustable size, weight, and comparison mode.
• Social Share Preview — Preview how links appear on Facebook, Twitter/X, LinkedIn, Discord, and Slack.
• Markdown to PDF — Convert Markdown to a styled HTML preview and export as PDF.

Testing & Debugging Tools 15

• Regex Tester — Test regular expressions with real-time matching, capture groups, and visual highlights.
• Diff Checker — Compare two texts side-by-side with line-level diff highlighting.
• JSON Formatter — Format, validate, and minify JSON. Syntax highlighting with error detection.
• JSON Schema Generator — Infer JSON Schema from sample data. Supports Draft-07 and Draft-04.
• XML Formatter & Validator — Format, validate, and minify XML with error detection.
• Regex to English — Explain regular expressions in plain English with detailed breakdowns.
• Regex Pattern Library — 50+ searchable regex patterns for emails, URLs, dates, IPs, and more.
• Responsive Design Tester — Preview HTML at different viewport sizes with device presets and side-by-side mode.
• WebSocket Tester — Connect to any ws:// or wss:// endpoint, send messages, and view live event logs with timestamps. JSON auto-detected.
• Browser Feature Detector — Test 40+ Web API support: WebGL, WebGPU, Service Workers, WebRTC, and more.
• IBAN Validator & Formatter — Validate IBANs with ISO 13616 mod-97 checksum. Format with spaces, extract BBAN, bank code, country.
• JavaScript Keycode Info — Press any key to see event.key, event.code, keyCode, which, location, and all modifier states in real time.
• Browser Performance Timing — Analyze navigation waterfall, resource timing, and Core Web Vitals (LCP/CLS/INP) live from the Performance API.
• AMP HTML Validator — Validate AMP HTML by checking for banned tags, required elements, and custom JS restrictions.
• Log File Forensics Analyzer — Paste or drag-drop logs to extract and count IPs, emails, URLs, file paths, timestamps, and MAC addresses with highlighting and CSV export.

Text & Content Tools 15

• Word Counter — Count words, characters, sentences, paragraphs, and reading time.
• Case Converter — Convert text between UPPER, lower, Title, camelCase, snake_case, and more.
• Lorem Ipsum Generator — Generate placeholder text by paragraphs, sentences, or words.
• Slug Generator — Generate clean URL slugs from any text. Handles accents and special chars.
• Readability Score — Calculate Flesch-Kincaid, Gunning Fog, Coleman-Liau, SMOG, and ARI readability scores.
• Text Sorter — Sort lines alphabetically, numerically, by length, randomly, or by custom column.
• List Deduper — Remove duplicate lines from lists. Sort, trim, and filter blank lines.
• Find & Replace (Advanced) — Advanced find and replace with regex, multi-rule, capture groups, and diff preview.
• Text Reverser — Reverse text by characters, words, lines, or sentences with Unicode support.
• Unicode Text Generator — Generate fancy text in bold, italic, script, fraktur, and more Unicode styles.
• Markdown Table Builder — Build markdown tables visually. Add rows, columns, and alignment.
• Whitespace Visualizer — Visualize invisible characters: spaces, tabs, newlines, NBSP with colored symbols.
• Character Frequency Analyzer — Analyze character frequency with bar chart, percentages, and CSV export.
• Emoji Picker — Search and copy from 1,800+ emojis organized by category with skin tone support.
• String Length Calculator — Calculate string length in characters, bytes (UTF-8/16), codepoints, and graphemes.

Unicode Tools 9

• Unicode Text Generator — Generate fancy text in bold, italic, script, fraktur, and more Unicode styles.
• Braille Translator — Convert text to Unicode Braille patterns with Grade 1 and Grade 2 support.
• Punycode / IDN Converter — Convert internationalized domain names between Unicode and Punycode (xn--).
• Zero-Width Char Detector — Detect and remove zero-width characters (ZWS, ZWNJ, ZWJ, BOM) from text.
• Emoji Picker — Search and copy from 1,800+ emojis organized by category with skin tone support.
• Unicode Search — Search Unicode characters by name, hex code, or description across all blocks.
• Unicode Inspector — Inspect character properties: codepoint, UTF-8/16 encoding, category, block, and script.
• Homoglyph Detector — Detect look-alike Unicode characters used in phishing and homoglyph attacks.
• String Obfuscator — Obfuscate text with Unicode homoglyphs, zero-width spaces, or HTML entities. Decode mode included.

Validator Tools 8

• JSON Formatter — Format, validate, and minify JSON. Syntax highlighting with error detection.
• JSON Schema Generator — Infer JSON Schema from sample data. Supports Draft-07 and Draft-04.
• XML Formatter & Validator — Format, validate, and minify XML with error detection.
• MAC Address Generator — Generate random or vendor-prefixed MAC addresses. Colon, hyphen, and Cisco dot formats. Bulk & validate.
• IBAN Validator & Formatter — Validate IBANs with ISO 13616 mod-97 checksum. Format with spaces, extract BBAN, bank code, country.
• IPv6 ULA Generator — Generate RFC 4193 Unique Local Addresses (fd00::/8). Create /48 prefixes, list /64 subnets, validate ULA addresses.
• E.164 Phone Formatter — Format messy phone numbers to E.164 standard (+1234567890). Country code selector, batch mode, and reference table.
• AMP HTML Validator — Validate AMP HTML by checking for banned tags, required elements, and custom JS restrictions.

More Tools 83

• JWT Decoder — Decode JWT tokens to inspect header, payload, and expiration. No validation.
• Cron Parser — Parse cron expressions to human-readable schedules and generate cron syntax.
• Timestamp Converter — Convert between Unix epoch timestamps and human-readable dates.
• CSV ↔ JSON — Convert between CSV and JSON formats with delimiter detection.
• YAML ↔ JSON — Convert between YAML and JSON formats with validation.
• .env Redactor — Paste .env files and redact secret values for safe sharing.
• XML ↔ JSON Converter — Convert between XML and JSON formats with attribute handling.
• TOML ↔ JSON Converter — Convert between TOML and JSON configuration formats.
• chmod Calculator — Calculate Unix file permissions with visual checkboxes and presets.
• Indent Converter — Convert between tabs and spaces with customizable indent width.
• Code Line Counter — Count lines of code, comments, and blank lines with language detection.
• .gitignore Builder — Generate .gitignore files by selecting project types and frameworks.
• ASCII Art Generator — Convert text to ASCII art with multiple font styles.
• Text Shadow Editor — Create text shadow effects with neon, 3D, retro, and custom layered styles.
• Border Radius Editor — Per-corner border radius editor with advanced blob shapes and presets.
• CSS Transform Playground — 2D and 3D CSS transform playground with rotate, scale, skew, and translate.
• Neumorphism Generator — Generate soft UI / neumorphic designs with concave, convex, and pressed states.
• Easing / Bezier Curve Editor — Interactive cubic-bezier curve editor with animation preview and presets.
• CSS Specificity Calculator — Calculate CSS selector specificity with visual breakdown and compare mode.
• CSS Unit Converter — Convert between px, rem, em, vw, vh, %, pt, and more CSS units.
• SVG to CSS Background — Convert SVG to CSS background-image with data URI, Base64, or URL encoding.
• SVG Path Editor — Visual SVG path editor - draw, edit control points, and export path data.
• Aspect Ratio Calculator — Calculate, compare, and resize aspect ratios with common preset references.
• NATO Phonetic Alphabet — Convert text to NATO, LAPD, or Western Union phonetic alphabets.
• TOTP 2FA Generator — Generate TOTP two-factor authentication codes with countdown timer.
• License Picker — Browse, compare, and generate open source license files (MIT, Apache, GPL, etc.).
• Changelog Generator — Build CHANGELOG.md entries in Keep a Changelog or Conventional format.
• SemVer Comparator — Compare, sort, increment, and test semantic version ranges.
• Git Cheat Sheet — Interactive Git command reference with 65+ commands, topics, and workflows.
• Text to Speech — Preview text with browser Speech Synthesis API. Adjustable voice, rate, pitch, and volume.
• Column Extractor — Extract columns from text by delimiter, fixed width, regex, or JSON path.
• ASCII Table — Interactive ASCII reference table (0-127) with search, convert, and extended ASCII.
• Syntax Highlighter — Highlight code syntax for JS, Python, HTML, CSS, SQL and export as styled HTML.
• Typing Speed Test — Test your typing speed (WPM) and accuracy with timed text passages.
• Pomodoro Timer — Pomodoro technique timer with customizable work/break intervals and session stats.
• Keyboard Shortcuts — Searchable keyboard shortcut reference for VS Code, JetBrains, Vim, and Terminal.
• Smart Quotes Converter — Convert between straight and curly quotes, fix dashes, ellipses, and typography.
• Unit Converter — Convert 100+ units across length, weight, temperature, volume, area, speed, and more.
• Byte Calculator — Convert between B, KB, MB, GB, TB, PB in binary (1024) and SI (1000) modes.
• Time Zone Converter — Convert times between 30+ world time zones with DST awareness.
• Date Calculator — Add/subtract dates, find differences in days/weeks/months, business day calculator.
• Roman Numeral Converter — Convert between Arabic numbers and Roman numerals (1-3999) with quiz mode.
• Percentage Calculator — 5-in-1 percentage tool: X% of Y, % change, increase/decrease, fraction to percent.
• Statistics Calculator — Calculate mean, median, mode, std dev, variance, percentiles with visual charts.
• Matrix Calculator — Matrix add, subtract, multiply, transpose, determinant, and inverse operations.
• Boolean Evaluator — Generate truth tables for boolean expressions with AND, OR, NOT, XOR, NAND, NOR.
• Bitwise Calculator — Perform AND, OR, XOR, NOT, shift operations with visual bit toggles.
• JSON ↔ XML Advanced — Bidirectional JSON/XML converter with attribute handling and namespace support.
• DPI Calculator — Calculate DPI/PPI from pixel dimensions and physical sizes for screen and print.
• Scientific Notation Converter — Convert between standard, scientific, and engineering notation with sig figs.
• Number to Words — Convert numbers to English words with ordinal and currency modes (up to trillions).
• Color Blindness Simulator — Simulate protanopia, deuteranopia, tritanopia, and achromatopsia on any color.
• Screen Info Detector — Detect screen resolution, DPR, color depth, orientation, touch, battery, and network.
• Time Duration Calculator — Add/subtract time durations, convert units, and calculate timesheet totals.
• Pi Digit Searcher — Search for any number sequence in the first 10,000 digits of Pi.
• Regex Golf — Write the shortest regex to match target strings. 10+ challenges with scoring.
• Epoch Countdown — Countdown timer to any Unix timestamp with milestone tracking.
• SQL Injection Demo — Educational SQL injection simulator with challenges and parameterized query fixes.
• Number to Emoji — Convert numbers to emoji digits, dice, Roman numeral emoji, and tally marks.
• Binary Art Generator — Convert text to visual binary patterns with customizable block characters.
• CSS Color Name Finder — Find the nearest CSS named color for any hex/RGB input using color distance.
• Lorem Ipsum Alternatives — Generate placeholder text: Classic, Hipster, Bacon, Pirate, Corporate, Cat ipsum.
• CSS Named Colors — Browse all 148 CSS named colors with search, sort by hue/lightness, and copy hex.
• HTML Symbols Reference — Searchable reference of 200+ HTML entities: currency, math, arrows, Greek, and more.
• Pixel Ruler — On-screen pixel measurement tool with horizontal/vertical rulers and DPI calibration.
• CSR Command Generator — Generate OpenSSL commands for CSR, self-signed certs, and key generation with SAN.
• JSON ↔ YAML Advanced — Bidirectional JSON/YAML converter with multi-document, anchors, and block/flow styles.
• Delimiter Converter — Convert between CSV, TSV, PSV, SSV with auto-detection and RFC 4180 quoted fields.
• Browser Fingerprint Viewer — Inspect your browser fingerprint: user agent, screen, hardware, WebGL renderer, canvas hash, and entropy estimate.
• SQL to ORM Model Generator — Paste a CREATE TABLE statement and generate Sequelize (JS), GORM (Go), SQLAlchemy (Python), or Prisma boilerplate instantly.
• Protobuf Schema Preview — Paste a .proto file to parse and visualize messages, services, enums, and fields as a structured tree.
• Math Expression Evaluator — Safely evaluate math expressions using the Shunting-yard algorithm (no eval). Supports +−×÷^%, sqrt, trig, log, ln, abs, pi, e with RPN trace and history.
• Download ETA Calculator — Calculate download/upload time from file size and speed. Supports all units (B→TB, Kbps→Gbps, KB/s→GB/s). Batch mode, progress simulator, and speed reference.
• Vigenère Cipher — Encrypt and decrypt text with the Vigenère polyalphabetic cipher. Brute force and tabula recta included.
• Anagram Checker — Check if two strings are anagrams. Character frequency comparison table and anagram generator.
• Palindrome Checker — Check if a word or phrase is a palindrome. Batch mode and famous palindromes reference.
• Email List Normalizer — Deduplicate email lists, strip Gmail dots and plus aliases, lowercase, and validate format.
• CSS Button Generator — Design CSS buttons visually with live preview. Customize padding, radius, colors, shadows, and get :hover/:active states.
• CSS Variable Theme Builder — Build a CSS custom property theme visually with live mock dashboard preview. Export a :root block.
• Layout Mockup Builder — Drag-and-drop wireframe blocks (header, sidebar, main, footer). Export clean HTML + CSS skeleton.
• Sudoku Solver — Solve 9x9 Sudoku with backtracking algorithm and step-by-step animation.
• Password Entropy Calculator — Calculate Shannon entropy with crack time estimates and strength rating.
• AI Token Counter — Count tokens for OpenAI, Anthropic, and Gemini models with cost estimation.