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126+ Free Developer Tools
Stop paying for overpriced software. Create professional documents, calculate rates, generate hashes, test JSONPath, convert TOML, decode JWTs, generate UUIDs, format SQL, compare text diffs, convert number bases, convert YAML, encode URLs, look up HTTP status codes, calculate chmod permissions, build cron expressions, convert colors, build CSS grids, generate .gitignore files, create README docs — all free, all in your browser.
ZapInvoice
Create professional invoices and download as PDF instantly.
- Multi-currency support (8 currencies)
- Tax calculations built in
- Multiple line items
- Custom payment terms
- PDF download, no watermark
ZapReceipt
Generate business receipts for clients and expense tracking.
- Professional receipt format
- Custom business details
- Payment method tracking
- Tax-ready formatting
- Instant PDF download
ZapProposal
Write winning business proposals that close deals faster.
- Structured proposal format
- Scope, timeline & pricing
- Professional PDF layout
- Custom branding options
- Send directly to clients
Free Calculators
Know your numbers. Calculate your rates and manage overdue invoices with precision.
Rate Calculator
Calculate your ideal freelance hourly rate based on income, expenses, and taxes.
- Accounts for taxes & expenses
- Billable hours calculator
- Hourly, daily & monthly rates
- Multi-currency support
Late Fee Calculator
Calculate how much a client owes on an overdue invoice with interest and fees.
- Simple interest calculation
- Flat fee + percentage
- Copy payment summary
- Days overdue tracking
Content & Design Tools
Essential tools for writers, designers, and content creators. All free, all instant.
Word Counter
Count words, characters, sentences, and paragraphs. Reading time, keyword density, and top frequent words.
- Words, characters, sentences, paragraphs
- Reading & speaking time
- Top 10 keywords with density
- Real-time stats as you type
Aspect Ratio Calculator
Calculate and convert aspect ratios. Lock ratio mode, common presets, and platform-specific dimensions.
- Auto-simplify ratios (e.g. 16:9)
- Lock ratio & resize proportionally
- YouTube, Instagram, Twitter presets
- Visual aspect ratio preview
Screen Size Detector
Detect your screen and viewport size in real-time. Responsive breakpoints, device reference, and media query snippets.
- Live screen & viewport dimensions
- Current CSS breakpoint indicator
- Common device size reference
- Copy media query snippets
Emoji Picker
Browse 400+ emojis by category, search by name, and copy as emoji, Unicode, HTML entity, or CSS code.
- 9 categories, 400+ emojis
- Search by name or keyword
- Unicode, HTML & CSS codes
- Recently copied history
Developer Tools
Essential utilities for developers. All free, all client-side, all instant.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes. Hash text or files, HMAC mode, verify hashes.
- MD5, SHA-1, SHA-256, SHA-384, SHA-512
- File hashing via drag & drop
- HMAC generation with secret key
- Hash verification / compare mode
JSONPath Tester
Test JSONPath expressions in real-time with match highlighting, filter support, and a clickable cheatsheet.
- Live expression evaluation
- Match highlighting in JSON view
- Filter expressions (?(@.prop))
- 20+ clickable examples
TOML ↔ JSON Converter
Convert between TOML and JSON with validation, error line numbers, pretty-print and minify.
- TOML to JSON & JSON to TOML
- Full TOML spec: tables, arrays, dates
- Error messages with line numbers
- Pretty-print & minify options
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates with timezone support.
- Timestamp to date & date to timestamp
- Live current timestamp counter
- Multiple formats (ISO, RFC, local)
- Timezone selector
JWT Decoder
Decode and inspect JSON Web Tokens. See header, payload, and expiration instantly.
- Decode header & payload
- Expiration status check
- Algorithm detection
- Tokens never leave your browser
cURL BuilderPRO
Build cURL commands visually or convert cURL to Python, JavaScript, Go, and more.
- Visual request builder
- Import existing cURL commands
- Convert to 7+ languages
- Copy code with one click
UUID Generator
Generate UUID v4 identifiers, bulk create up to 100, validate format, and create short IDs.
- Cryptographically random UUID v4
- Bulk generate 1–100 UUIDs
- Validate & inspect any UUID
- Short hex ID generator
HTTP Status Codes
Complete reference for all HTTP status codes with descriptions, common causes, and troubleshooting tips.
- All codes from 1xx to 5xx
- Search & filter by code or text
- Detailed troubleshooting tips
- Deep-link to any code
URL Encoder/Decoder
Encode and decode URLs, Base64, and HTML entities. Auto-detect encoded input.
- URL encode & decode
- Base64 encode & decode
- HTML entity conversion
- Bulk mode for multiple lines
YAML ↔ JSON Converter
Convert between YAML and JSON formats with validation, pretty-print, and minify.
- YAML to JSON & JSON to YAML
- Side-by-side editor
- Syntax validation
- Pretty-print & minify
YAML Validator & Linter
Validate YAML syntax, find errors with line numbers, and format valid YAML with pretty-print.
- Syntax validation
- Error line numbers
- Pretty-print formatting
- Real-time linting
HTML Entity Encoder
Encode and decode HTML entities with a searchable reference table of 100+ entities.
- Named & numeric entities
- Searchable reference table
- Click to copy any entity
- Bulk processing
URL Slug Generator
Convert any text into SEO-friendly URL slugs. Handles unicode, accented characters, and special chars.
- Live slug preview
- Custom separators
- Unicode transliteration
- Bulk slug generation
Markdown Table Generator
Build Markdown tables visually with a spreadsheet-like editor. Import CSV, set alignment, copy output.
- Visual table editor
- Column alignment options
- CSV/TSV import
- Preset templates
Placeholder Image Generator
Generate custom placeholder images with any size, color, and text. Download as PNG, SVG, or JPEG.
- Custom size & colors
- Text overlay
- PNG, SVG, JPEG export
- Quick size presets
Chmod Calculator
Calculate Unix file permissions visually. Convert between numeric (755) and symbolic (rwxr-xr-x) formats.
- Visual permission grid
- Numeric & symbolic output
- Common presets (644, 755, 777)
- chmod command preview
Cron Expression Generator
Build and understand cron expressions visually. Human-readable explanations and next execution times.
- Visual cron builder
- Human-readable explanation
- Next 5 execution times
- Common schedule presets
Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats with live preview and color harmony.
- HEX, RGB, HSL, HSV, CMYK
- Live color preview & picker
- Complementary & triadic colors
- One-click copy any format
CSS Grid Generator
Build CSS Grid layouts visually. Configure rows, columns, gaps, alignment, and item placement with live preview.
- Visual grid builder with live preview
- Custom row & column sizes (fr, px, %)
- Grid item span & placement
- Common layout presets
.gitignore Generator
Generate .gitignore files for 30+ languages and frameworks. Combine templates, search, preview, and copy.
- 30+ language & framework templates
- Combine multiple templates
- OS, IDE & env file patterns
- Live preview & one-click copy
Dockerfile GeneratorPRO
Generate production-ready Dockerfiles visually. Multi-stage builds, best practices hints, and layer optimization.
- 15+ base images (Node, Python, Go, etc.)
- Multi-stage build support
- Best practices & security hints
- Layer optimization & one-click copy
README.md Generator
Generate professional README.md files for GitHub projects with templates, badges, and live preview.
- 5 templates (minimal to detailed)
- Badge generator (shields.io)
- Live Markdown preview
- One-click copy & download
CSS & JS Minifier
Minify CSS and JavaScript code instantly. See compression stats, copy minified output, or beautify code.
- CSS & JavaScript minification
- Compression stats (% saved)
- Beautify / format option
- One-click copy output
Meta Tag Generator
Generate SEO meta tags, Open Graph, and Twitter Card tags. Preview how your page looks in Google and social media.
- SEO, OG & Twitter Card tags
- Google SERP preview
- Character count indicators
- One-click copy all tags
JSON-LD Schema Generator
Generate structured data markup for Google rich results. Supports Article, Product, FAQ, LocalBusiness, and more.
- 11 schema types supported
- Dynamic form fields
- Live JSON-LD preview
- Copy & validate output
SQL Formatter
Format and beautify SQL queries with syntax highlighting, or minify for production. Configurable indentation and keyword case.
- Format & beautify SQL queries
- Minify SQL for production
- Syntax highlighting
- Configurable indent & keyword case
Text Diff
Compare two text blocks side by side. See added, removed, and changed lines with word-level highlighting.
- Side-by-side text comparison
- Word-level diff highlighting
- Lines added/removed/unchanged stats
- Copy diff output
Base Converter
Convert numbers between binary, octal, decimal, hex, and custom bases (2-36). BigInt support and bit visualization.
- Binary, Octal, Decimal, Hex
- Custom bases 2–36
- Bit visualization & ASCII display
- Two’s complement for negatives
XML Formatter
Format, validate, and beautify XML with proper indentation. Minify XML or view as collapsible tree structure.
- Format & beautify XML
- Validate syntax with error details
- Minify XML option
- Tree view & one-click copy
Regex TesterPRO
Test and debug regular expressions in real-time with match highlighting, capture groups, and common pattern library.
- Real-time match highlighting
- Capture group extraction
- Flags support (g, i, m, s)
- Common regex pattern library
CSV ↔ JSON Converter
Convert CSV to JSON and back. Auto-detect delimiters, smart type coercion, RFC 4180 compliant parsing.
- CSV to JSON & JSON to CSV
- Auto-detect comma/tab/pipe/semicolon
- Pretty-print with 2/4 space indent
- Download as .json or .csv
ASCII Table
Complete ASCII character reference (0-127) with decimal, hex, octal, binary codes. Text ↔ ASCII converter.
- Full 128-character reference table
- Search by code, char, or description
- Text to ASCII & ASCII to Text
- Color-coded categories & click-to-copy
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, and 9 more formats instantly.
- 13 case formats simultaneously
- Smart word splitting
- Bulk multi-line conversion
- Click-to-copy any result
JSON Formatter
Format, validate & beautify JSON online. Configurable indentation, minification, tree view, and error reporting.
- Format with 2/4 spaces or tabs
- Validate with line/column errors
- Minify JSON in one click
- Tree view & stats (keys, depth, size)
Markdown Preview
Live Markdown editor with side-by-side preview. Full CommonMark support with code blocks and tables.
- Side-by-side live preview
- Headers, lists, tables, code blocks
- Export as HTML
- Word, character & line count
CSS Flexbox Generator
Visual Flexbox playground with live preview. Generate CSS code for any layout with preset templates.
- Visual drag-and-drop playground
- All flex properties with controls
- Preset layouts (navbar, sidebar, grid)
- Copy generated CSS instantly
HTML to Markdown
Convert HTML to clean Markdown instantly. Handles headings, lists, links, images, tables, code blocks, and more.
- Full HTML element support
- Table & code block conversion
- Paste HTML, get clean Markdown
- One-click copy output
IP Subnet CalculatorPRO
Calculate network address, broadcast, host range, subnet mask, and wildcard mask from any IP/CIDR notation.
- CIDR notation input with slider
- Network, broadcast, host range
- Subnet mask & wildcard mask
- Common subnet presets
Image to Base64
Convert images to Base64 data URIs or decode Base64 back to images. Drag & drop, preview, and copy.
- Drag & drop image upload
- Base64 data URI output
- Reverse: Base64 to image preview
- File size & dimension info
CSS Gradient Generator
Create beautiful CSS gradients with a visual editor. Linear, radial, and conic gradients with real-time preview.
- Linear, radial & conic gradients
- Visual color stop editor
- Angle & direction controls
- 10 preset gradient templates
CSS Box Shadow Generator
Design box shadows visually with slider controls. Multiple layers, inset shadows, and neumorphism presets.
- Offset, blur, spread & color controls
- Multi-layer shadow support
- Inset shadow toggle
- 10 preset shadow styles
CSS Animation GeneratorPRO
Build CSS animations visually. 14 pre-built templates with full control over timing, direction, and keyframes.
- 14 animation presets (fade, slide, bounce...)
- Duration, delay & timing controls
- Live preview with play/pause
- Copy @keyframes + animation CSS
CSS Filter & Effects Generator
Visual CSS filter editor with sliders for blur, brightness, contrast, grayscale, hue-rotate, invert, opacity, saturate, and sepia.
- 9 filter property sliders
- Live preview on sample element
- Reset all & copy CSS
- Real-time filter string output
robots.txt Generator
Build robots.txt files visually. Add user-agent rules, block AI crawlers, set crawl-delay, sitemap URL, and more.
- User-agent presets (Googlebot, GPTBot...)
- Allow/disallow rule builder
- Block AI crawlers preset
- Download & copy output
XML Sitemap Generator
Generate valid XML sitemaps with changefreq, priority, and lastmod for each URL. Bulk add support.
- Add URLs with metadata
- Bulk URL import
- Valid XML output
- Download as sitemap.xml
CSS Border Radius Generator
Design border radius visually with individual corner controls. Link/unlink corners, presets, and live CSS output.
- Individual corner sliders
- Link/unlink corners toggle
- 12 presets (pill, circle, blob...)
- Live preview & copy CSS
JS Beautifier & Minifier
Beautify or minify JavaScript code. Configurable indentation, compression stats, and string-safe processing.
- Beautify with 2/4 spaces or tabs
- Minify with compression stats
- Preserves strings & comments
- One-click copy output
CSS Unit Converter
Convert between px, em, rem, vw, vh, pt, cm, mm, and more. Set base font size and viewport dimensions.
- All CSS units supported
- Custom base & viewport
- Instant conversion table
- One-click copy values
Lorem Ipsum Generator
Generate placeholder text as paragraphs, sentences, or words. HTML output option with customizable count.
- Paragraphs, sentences, or words
- Classic or random start
- HTML output option
- One-click copy
Social Media Character Counter
Check character limits for Twitter/X, Instagram, LinkedIn, YouTube, TikTok, and more. Visual progress bars.
- 8 platform limits
- Visual progress bars
- Word count & reading time
- Real-time counting
JSON Schema Generator
Generate JSON Schema from sample JSON data. Supports Draft 4, 6, 7, and 2020-12 with type inference and nested objects.
- Auto type inference
- Multiple draft versions
- Nested object support
- Copy & download
Favicon Generator
Create favicons from text, emoji, or initials. Multiple sizes, custom colors, and download as PNG.
- Text/emoji input
- Custom colors & radius
- All common sizes
- PNG download
Color Palette Generator
Generate harmonious color palettes using color theory. Complementary, analogous, triadic, and more schemes.
- 6 harmony types
- Export CSS/Tailwind/SCSS
- Random generator
- Lock & regenerate
CSS Clip-Path GeneratorPRO
Visual CSS clip-path builder with drag handles. Preset shapes, custom polygons, and real-time CSS output.
- Interactive drag handles
- 10+ preset shapes
- polygon/circle/ellipse
- Copy CSS output
Code Screenshot GeneratorPRO
Create beautiful code screenshots like Carbon. Multiple themes, syntax highlighting, and PNG download.
- 5 color themes
- Syntax highlighting
- Window controls
- PNG export
HTML Table Generator
Visual HTML table builder. Edit cells inline, add/remove rows and columns. Export as HTML, Markdown, CSV, or JSON.
- Inline cell editing
- 4 export formats
- CSV import
- Styled preview
JSON DiffPRO
Compare two JSON objects side by side. Highlights additions, deletions, and changes with color-coded diff view.
- Side-by-side & unified view
- Color-coded differences
- Deep nested comparison
- Copy diff output
XML ↔ JSON Converter
Convert XML to JSON and JSON to XML. Handles attributes, namespaces, CDATA, and nested structures.
- Bidirectional conversion
- Namespace & CDATA support
- Syntax highlighting
- Download output
HTML Playground
Live HTML/CSS/JS editor with instant preview. Built-in templates, console output, and export as single file.
- Live preview as you type
- HTML, CSS, JS panes
- Console output panel
- 5 starter templates
SVG OptimizerPRO
Optimize and clean SVG files. Remove metadata, comments, hidden elements. See exact bytes saved.
- 11 optimization options
- Before/after size stats
- Live SVG preview
- Download optimized file
CSP GeneratorPRO
Build Content Security Policy headers visually. 14 directives, presets, nonce/hash helper. Copy as header or meta tag.
- 14 CSP directives
- 5 security presets
- Nonce & hash helper
- Header & meta tag output
OpenAPI EditorPRO
Visual OpenAPI/Swagger spec editor. Define endpoints, schemas, parameters. Export as YAML or JSON.
- Visual form editor
- YAML & JSON output
- Import existing specs
- 5 API templates
.env Editor
Edit and validate .env files. Syntax highlighting, duplicate detection, convert between .env, JSON, and YAML formats.
- Syntax highlighting
- Duplicate key detection
- .env ↔ JSON ↔ YAML
- Framework templates
API TesterPRO
Send HTTP requests from your browser. Custom headers, JSON body, response viewer with timing. Like Postman, but free.
- GET, POST, PUT, DELETE
- Custom headers & body
- Response time tracking
- Generate cURL commands
Cookie Parser
Parse Cookie and Set-Cookie headers. Visual builder for Set-Cookie with all attributes. Detect common issues.
- Parse cookie strings
- Visual Set-Cookie builder
- Security issue detection
- Encode/decode values
HTTP Headers
Complete HTTP headers reference. Search by name, expand for details. Build header blocks with security & CORS presets.
- All standard headers
- Search & filter
- Security presets
- CORS configuration
SSH Config
Generate ~/.ssh/config entries visually. Presets for GitHub, AWS, bastion hosts. Parse existing configs.
- Visual config builder
- GitHub/AWS presets
- Parse existing configs
- Best practice tips
Markdown to HTML
Convert Markdown to clean HTML with live preview. Supports headings, lists, code blocks, tables, and more.
- Live side-by-side preview
- Full Markdown syntax
- Copy HTML output
- Client-side only
JSON to TypeScript
Convert JSON data into TypeScript interfaces automatically. Nested objects, arrays, optional properties support.
- Nested interface generation
- Array type inference
- Export keyword toggle
- Real-time conversion
HTML to JSX
Convert HTML to valid JSX/React code. Handles className, style objects, self-closing tags, event handlers.
- class to className
- Style string to object
- Event handler conversion
- Real-time conversion
JSON to Go Struct
Convert JSON data to Go struct definitions with proper field names, json tags, and type inference.
- CamelCase field names
- JSON tags generated
- Nested struct support
- omitempty toggle
CSV to SQL
Convert CSV data to SQL INSERT statements. MySQL, PostgreSQL, SQLite support with CREATE TABLE generation.
- Auto-detect columns
- Multiple SQL dialects
- CREATE TABLE option
- File upload support
Unit Converter
Convert between units of length, weight, temperature, volume, area, speed, data, and time instantly.
- 8 unit categories
- Bidirectional conversion
- Swap button
- Copy result
Image Compressor
Compress images client-side. Adjust quality, resize, convert formats. See before/after comparison.
- JPEG, PNG, WebP output
- Quality slider
- Size comparison
- 100% client-side
CSS Animation Generator
Build CSS keyframe animations visually. Presets for bounce, fade, spin, shake. Live preview and generated code.
- Visual keyframe editor
- 8 preset animations
- Live preview
- Copy CSS output
QR Code Reader
Decode QR codes from images. Drag and drop or paste from clipboard. Auto-detects URLs.
- Drag & drop upload
- Paste from clipboard
- URL auto-detection
- Copy decoded text
Color Picker
Advanced color picker with HEX, RGB, HSL formats. WCAG contrast checker, color history, and CSS output.
- HEX, RGB, HSL sync
- WCAG contrast check
- Color history
- Copy any format
URL Parser
Break down any URL into components: protocol, host, port, path, query params, hash. Rebuild and copy.
- Parse any URL into parts
- Editable query parameters
- Rebuild URL from parts
- Copy individual components
Password Generator
Generate strong, secure passwords with customizable length and character sets. Strength meter and bulk mode.
- Length 8-128 characters
- Uppercase, lowercase, numbers, symbols
- Password strength meter
- Bulk generate up to 50
Morse Code Translator
Convert text to Morse code and back. Play audio beeps. Supports letters, numbers, and punctuation.
- Text to Morse & Morse to text
- Audio playback with Web Audio
- Visual dot/dash display
- Copy encoded result
Binary/Text Converter
Convert between text, binary, hex, octal, and decimal. Space-separated or continuous format.
- Text to binary & binary to text
- Hex, octal, decimal modes
- Space-separated toggle
- Copy converted result
HTML Minifier
Minify HTML by removing whitespace and comments. Also beautify/format with indentation. Size comparison.
- Minify & beautify HTML
- Remove comments & whitespace
- Size savings display
- Copy minified output
SQL String Escaper
Escape strings for SQL queries. MySQL, PostgreSQL, SQLite, SQL Server. Parameterized query builder.
- 4 SQL dialects supported
- Escape & unescape modes
- Parameterized query output
- Copy escaped result
Number Formatter
Format numbers with locale-specific separators, currency, percentage, scientific notation, and number to words.
- Locale-aware formatting
- Currency & percentage modes
- Scientific notation
- Number to words converter
Date Format Converter
Convert dates between 20+ formats: ISO 8601, Unix timestamp, RFC 2822, human readable, and more.
- 20+ date formats
- Unix timestamp conversion
- Timezone support
- Copy any format
IP Address Analyzer
Detect your public IP, validate IPv4/IPv6, CIDR calculator, subnet ranges, and binary representation.
- Auto-detect public IP
- IPv4/IPv6 validator
- CIDR subnet calculator
- Binary IP representation
Character Counter
Advanced text analyzer: characters, words, sentences, paragraphs, reading time, word frequency, and more.
- Characters with/without spaces
- Reading & speaking time
- Word frequency analysis
- Character breakdown
String Escaper
Escape and unescape strings for JSON, JavaScript, Python, Java, C#, HTML, URL, SQL, CSV, and XML.
- 10 language formats
- Escape & unescape modes
- Live conversion on input
- Side-by-side editor
Line Sorter
Sort lines alphabetically, numerically, by length, or naturally. Deduplicate, shuffle, reverse, and trim.
- A-Z, Z-A, numeric, natural sort
- Remove duplicate lines
- Shuffle & reverse
- Trim whitespace & blank lines
Unicode Lookup
Search Unicode characters by name or code point. Convert between U+, HTML entity, CSS, and JS formats.
- Search by name or code point
- Category browser (Arrows, Math, etc.)
- Click-to-copy characters
- 6 format conversions
Find & Replace
Find and replace text with plain text or regex. Case-sensitive, whole word, match highlighting.
- Plain text & regex modes
- Case sensitive toggle
- Match highlighting preview
- Replace all or first only
Nginx Config Generator
Generate Nginx configs for static sites, reverse proxies, WordPress, Node.js, and PHP-FPM apps.
- 5 common presets
- SSL, gzip, CORS, rate limiting
- Syntax-highlighted output
- One-click copy
JSON ↔ YAML
Convert between JSON and YAML with auto-detection, bidirectional swap, and indentation control.
- Auto-detect input format
- Swap direction button
- 2 or 4 space indentation
- Error display for invalid input
Mock Data Generator
Generate fake JSON data with 16+ field types. Export as JSON, CSV, or SQL INSERT statements.
- 16 field types (name, email, etc.)
- 1–100 records
- JSON, CSV, SQL output formats
- Schema builder UI
.htaccess Generator
Generate Apache .htaccess files with redirects, security headers, caching, gzip, CORS, and more.
- 5 CMS/framework presets
- Redirects & URL rewriting
- Security headers & caching
- IP blocking & hotlink protection
AI Token Counter
Count tokens for GPT-4, Claude, and Llama models. See cost estimates and context window usage.
- 8 AI model estimates
- Cost per input/output
- Context window usage bars
- Real-time counting
Contrast Checker
Check WCAG color contrast ratios. AA/AAA compliance for normal and large text with accessible alternatives.
- WCAG 2.0 contrast ratio
- AA & AAA pass/fail badges
- Hex, RGB, HSL input
- Suggest accessible alternatives
SVG to PNG Converter
Convert SVG to PNG online. Upload or paste SVG code, preview, set custom output dimensions, and download as high-quality PNG.
- Upload or paste SVG code
- Live SVG preview
- Custom width, height & scale
- Download as PNG
JSON Validator
Validate and format JSON online. Error reporting with line and column, beautify, minify, and interactive tree view.
- Validate with line/column errors
- Beautify & minify JSON
- Interactive tree view
- Stats: keys, depth, size
CSS Minifier & Beautifier
Minify or beautify CSS online. Remove whitespace and comments, format with indentation, and see size reduction stats.
- Minify & beautify CSS
- Remove comments & whitespace
- Size reduction percentage
- Copy minified output
Cron Expression Generator
Build cron expressions visually with dropdowns. Common presets, human-readable descriptions, and next 5 scheduled run times.
- Visual dropdowns for each field
- 14 common presets
- Human-readable description
- Next 5 run times
XPath Expression Tester
Test and evaluate XPath expressions against XML/HTML. Common examples, node matching, and result highlighting.
- Real-time XPath evaluation
- 20+ common examples
- Node type badges
- Copy results
Tailwind CSS Class Reference
Searchable reference of 200+ Tailwind CSS utility classes. Categories, CSS equivalents, and one-click copy.
- 200+ classes
- 8 categories
- Live search & filter
- Click to copy
Visual SQL Query Builder
Build SELECT, INSERT, UPDATE, DELETE queries visually. WHERE clauses, ORDER BY, GROUP BY with syntax highlighting.
- 4 query types
- Visual WHERE builder
- Syntax highlighting
- Copy SQL
CSS Media Query Generator
Generate CSS media queries with preset breakpoints, custom builders, and 16 device presets including iPhone and iPad.
- 12 preset breakpoints
- 16 device presets
- Custom builder
- Copy CSS
Git Command Builder & Reference
Build git commands interactively. 25 actions with flags, plus a searchable reference of 40+ common commands.
- 25 git actions
- Interactive flags
- 40+ command reference
- Click to copy
Keyboard Event Code Reference
Press any key to see event.key, event.code, keyCode, which, and location. Visual keyboard with key highlighting.
- Full event properties
- Visual keyboard
- Key history
- Modifier badges
HTML Table Generator
Visual table editor with dynamic rows/columns. Style options: bordered, striped, hover. Live preview and HTML output.
- Visual cell editor
- 4 style options
- Dark/light themes
- Copy HTML
JSON to CSV Converter
Convert JSON arrays to CSV and back. Flatten nested objects, configurable delimiters, download CSV files.
- Bidirectional conversion
- 4 delimiter options
- Nested object flattening
- Download CSV
Color Blindness Simulator
See how colors appear under 8 types of color blindness. WCAG contrast ratio calculator with AA/AAA grading.
- 8 vision types
- WCAG contrast check
- AA/AAA grading
- Click to copy hex
Text to Speech Converter
Convert text to speech using the Web Speech API. Choose voices, adjust rate, pitch, and volume. Play, pause, stop.
- Multiple voices
- Rate/pitch/volume
- Play/pause/stop
- Works offline
YAML Validator & Linter
Validate YAML syntax, get error messages with line numbers, lint for common issues, and pretty-print valid YAML.
- Syntax validation with line numbers
- Lint warnings for common issues
- Pretty-print / format YAML
- Stats: keys, depth, size
HTTP Status Codes Reference
Complete HTTP status codes reference (1xx-5xx). Color-coded by category with search, filter, and detailed descriptions.
- All 63 HTTP status codes
- Color-coded by category
- Search & filter by code or name
- Detailed descriptions & usage
JWT Debugger
Decode and inspect JWT tokens. View header, payload, claims, check expiry, and validate structure. Color-coded output.
- Decode header & payload
- Expiry status & timestamps
- Claims table with descriptions
- Color-coded token preview
Cheat Sheets & References
Quick-reference guides for the languages and tools you use every day. Searchable, copy-paste ready, always free.
TypeScript Cheat Sheet
Complete TypeScript reference: types, interfaces, generics, utility types, enums, type guards, mapped types, and more.
- 55 items across 10 categories
- Code examples with syntax highlighting
- Search & filter by topic
- Click to copy any snippet
React Cheat Sheet
Complete React reference: hooks, components, events, forms, context, performance, custom hooks, and React 18+ features.
- 26 items across 12 categories
- Real-world code patterns
- Search & filter by topic
- Click to copy any snippet
Bash Cheat Sheet
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- 50+ items across 13 categories
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