Free online developer tools and utilities for everyday coding tasks.
130 tools available
Encode and decode Base64 strings
Generate MD5, SHA-1, SHA-256 hashes
Generate QR codes from text or URLs
Encode and decode URL strings
Convert between timestamps and dates
Generate placeholder text
Convert text case (uppercase, lowercase, etc.)
Count words, characters, and lines
Generate UUIDs (v1, v4)
Generate secure random passwords
Test and debug regular expressions
Decode and verify JWT tokens
Preview Markdown with live rendering
Pick colors and convert between formats
Compare two texts and find differences
Convert Markdown to HTML
Convert HTML to Markdown
Generate SEO-friendly URL slugs
Reverse text by characters, words, or lines
Convert between binary, octal, decimal, and hex
Parse and validate cron expressions, see next run times
Beautify and format HTML with proper indentation
Calculate Unix file permissions with visual toggles
Escape and unescape JS, HTML, URL, and regex strings
Convert text to binary and binary back to text
Encode and decode HTML entities
Inspect Unicode code points, names, and encodings
Convert JSON to Go struct type definitions
Beautify, minify, and validate YAML documents
Generate random numbers within a custom range
Complete reference for all HTTP response status codes
View CSV data as a sortable, searchable table
Convert length, weight, temperature, area, volume, and more
Compute HMAC-SHA256, SHA512 signatures with a secret key
Encrypt and decrypt text with AES-256-GCM or AES-CBC
Convert CSV data to XML format with custom element names
Convert XML data to CSV format for spreadsheets
Create Markdown tables visually with alignment support
Set a countdown timer with hours, minutes, and seconds
Pick random items from a list for decisions and giveaways
Convert text to ASCII art with multiple font styles
Check password strength and get security improvement tips
Generate time-based one-time passwords from a Base32 secret
Browse, search, and copy emojis by category instantly
Convert Excel XLSX/XLS files to JSON with multi-sheet support
Parse SQL INSERT statements and export data as CSV
Generate linear and radial CSS gradients visually with live preview
Build CSS box shadows visually with multi-layer support and live preview
Create multi-size favicons from text, emoji, or image upload
Generate RSA public and private key pairs in PEM format in your browser
Convert unified diff output to a downloadable .patch file
Generate SHA3-256, SHA3-512, and Keccak hash variants
Parse and validate TOML files, convert to JSON
View any file's raw bytes in hexadecimal format
Convert text to speech using browser built-in voices
Build cron expressions visually with a simple UI
Curated library of common regular expressions to copy
Searchable Git commands cheat sheet with one-click copy
Generate docker-compose.yml files with a visual builder
Encode text to Base32 or decode Base32 strings (RFC 4648)
Generate and sign JSON Web Tokens with HS256, HS384, or HS512
Generate and verify BCrypt password hashes with configurable cost factor
Convert images to Base64 data URL, CSS background, or HTML img tag
Minify CSS by removing comments, whitespace, and redundant characters
Minify HTML by removing comments, collapsing whitespace, and more
Translate text to Morse code and decode Morse code back to text
Encode text to Base58 and decode Base58 using the Bitcoin/IPFS alphabet
Convert colors between HEX, RGB, HSL, and HSV formats with a live preview
Parse any URL into protocol, host, port, path, query params, and hash
Convert text to hexadecimal bytes and decode hex back to text (UTF-8)
Convert numbers to English words — integers, decimals, negatives, and ordinals
Convert between px, rem, em, vw, vh, pt, cm, mm and more with custom viewport settings
Calculate network address, broadcast, host range, subnet mask and binary from any IPv4 CIDR
Generate complementary, triadic, analogous, and monochromatic palettes from any base color
Visually build HTTP requests and generate curl, fetch, and axios code snippets with headers, body, and auth
Analyze JSON field sizes with an interactive tree. See which fields take the most space in your payload
Generate realistic test data with a custom schema. Export as JSON, CSV, or SQL INSERT statements
Beautify, minify, and validate XML online with configurable indentation
Sort, deduplicate, reverse, and shuffle lines of text with alphabetical, numeric, and length modes
Convert between decimal numbers and Roman numerals. Supports 1–3999 with full validation
Count character and word frequency in any text with ranked frequency tables and percentage bars
Convert YAML configuration files to TOML format with nested tables and array-of-tables support
Recursively sort all JSON object keys alphabetically in ascending or descending order
Convert JSON objects to dotenv key=value format and back. Nested keys flattened with underscores
Analyze text readability with Flesch-Kincaid, Gunning Fog, SMOG, and ARI scores
Beautify or minify CSS online with configurable indentation and compression ratio
Generate arithmetic, geometric, Fibonacci, prime, square, and other number sequences
Clean and minify SVG files by removing comments, metadata, and editor namespaces
Comprehensive IPv4 tool: CIDR subnet details, subnet splitter, VLAN 802.1Q tags, and route summarization
Write HTML and CSS with a live preview pane — experiment with layouts, animations, and styles instantly
Deep-inspect JWT tokens: decode header, payload, signature, expiry status, and all RFC 7519 claims
Format and beautify SQL queries with configurable indentation, keyword case, and minify mode
Preview how your image looks to people with 8 types of color vision deficiency including deuteranopia and protanopia.
Check WCAG 2.1 AA and AAA contrast ratio compliance for foreground and background colors.
Convert HTML to JSX — transforms class, for, inline styles, event handlers, and void elements.
Convert cURL commands to JavaScript (fetch), Python (requests), Go (net/http), and Rust code.
Render code snippets as beautiful syntax-highlighted PNG images with themes and window chrome.
Press any key to see its JavaScript KeyboardEvent properties: key, keyCode, code, which, and modifiers.
Generate a full 11-stop tints and shades palette from any base color. Export as Tailwind config or CSS variables.
Convert font sizes between px, rem, em, and pt with a configurable base size. Includes common size reference table.
Convert a JSON sample into a Zod schema with TypeScript types. Supports nested objects, arrays, and null values.
Paste any regular expression and get a plain-English breakdown of every token, quantifier, group, and flag.
Calculate the (a, b, c) specificity score of any CSS selector and compare two selectors side by side.
Generate placeholder images at any size with custom colors. Download as SVG or PNG, or copy HTML/CSS snippets.
Build Apache .htaccess rules visually — HTTPS, www redirects, GZIP, caching, CORS, and custom error pages.
Generate Nginx server block configuration — HTTPS, reverse proxy, PHP-FPM, gzip, rate limiting, and security headers.
Build a robots.txt file visually. Control bot access per user-agent, block paths, set crawl delays, and add sitemap URL.
Generate HTML meta tags including Open Graph and Twitter Card. Preview how your page looks in search results and social media.
Convert .env files to JSON and JSON back to .env format. Supports comments, quoted values, and the export prefix.
Searchable MIME types reference table. Find the correct Content-Type for any file extension.
A searchable Linux commands cheat sheet covering files, permissions, networking, processes, and more.
Build Content Security Policy headers visually. Configure directives, add allowed sources, and copy the header or meta tag.
Find the closest Tailwind CSS color to any hex, RGB, or HSL value. See the top 8 matches ranked by perceptual similarity.
Convert SQL INSERT statements or pipe-delimited query results to JSON arrays. Auto-coerces types.
Check if a semantic version satisfies a range. Supports ^, ~, >=, hyphen, wildcard, and OR ranges.
Verify JWT HMAC signatures (HS256, HS384, HS512) client-side. Decode header, payload, and check token expiry.
Analyze a Content-Security-Policy header for unsafe directives, missing policies, and security risks.
Pretty-print and format XML online with configurable indentation.
Convert TOML configuration files to YAML format online.
Convert YAML config to .env KEY=VALUE pairs with nested key flattening.
Searchable reference for HTTP request, response, and security headers.
Search Unicode characters by name or code point. Copy char, HTML entity, or JS escape.
Searchable reference for JWT registered, public, and private claims with types and examples.
Complete HTTP methods reference with safe/idempotent properties, use cases, and request examples.
Complete Markdown syntax reference covering headings, lists, links, tables, and GFM extensions.
All 140 CSS named colors with hex, RGB, and HSL values. Search and copy any format.
Convert SQL CREATE TABLE DDL statements to TypeScript interfaces instantly.
Look up Tailwind CSS utility classes for any CSS property. 250+ mappings.
Perform arithmetic and bitwise operations on binary, octal, decimal, and hex numbers.
Complete DNS record types reference: A, AAAA, CNAME, MX, TXT, SPF, DKIM, DMARC, and more.