Developer Tools
Encode, decode, format, and validate. Essential utilities for developers that run entirely in the browser.
All Developer Tools (28)
Explore our collection of free developer tools
Base64 Encoder
Encode and decode text and files to Base64.
Encode Base64Color Picker
Native color picker with HEX/RGB/HSL output and recent-colors history. Click the swatch or type a hex — values update instantly.
Pick ColorCron Expression Parser
Translate 5-field POSIX cron expressions into plain English with field breakdown and the next 5 scheduled runs.
Parse CronCSS Beautifier
Pretty-print minified CSS — preserves comments, parens (calc/url/var), string literals; canonical 'prop: value;' formatting.
Beautify CSSCSS Minifier
Compress CSS using Yandex's csso engine — removes whitespace, comments, merges rules, dedupes selectors, compresses colors.
Minify CSSGitHub Profile README Generator
Generate a stunning GitHub profile README with stats, badges, and tech stack — in seconds, no coding needed.
Generate READMEJSON Formatter
Beautify, minify, and sort-key JSON in real time. Surfaces parse errors with line + column. 100% client-side.
Format JSONJSON Validator
Validate JSON in real time with structural diagnostics — node count, max depth, type counts, and precise parse-error location.
Validate JSONJWT Decoder
Paste any JSON Web Token to decode header, payload claims, and inspect expiry status — 100% client-side, signature never leaves the browser.
Decode JWTRegex Tester
Live regex testing with highlighted matches, capture groups, named groups, and JS-engine flag toggles (i/m/s/u/y).
Test RegexURL Encoder / Decoder
Encode or decode URLs and query parameters — supports both encodeURIComponent and encodeURI modes.
Encode URLUUID Generator
Generate cryptographically random RFC 4122 v4 UUIDs — single, bulk (up to 1000), with format options. 100% client-side.
Generate UUID.env File Parser
Parse and validate .env files in your browser — catch duplicate keys, empty values, and syntax errors, then export clean JSON.
Parse .env.gitignore Generator
Build a clean .gitignore by combining curated templates for Node, Python, Rust, Go, macOS, Windows, JetBrains, VS Code, Docker and more.
Generate .gitignoreBase64 Encoder/Decoder
Encode plain text to Base64 or decode Base64 back to text — Unicode-safe, instant, browser-only.
Encode / DecodeDiff Checker
Compare two blocks of text or code side by side and highlight every added, removed, and unchanged line — with line, word, or character precision.
Check DiffDNS Record Lookup
Look up A, AAAA, CNAME, MX, TXT, NS records for any domain via public DNS resolvers.
Use ToolGradient Generator
Build CSS linear, radial, and conic gradients with a live preview, custom colour stops, and one-click copy — no sign-up, runs entirely in your browser.
Generate GradientHTML Entity Encoder
Encode and decode HTML entities both directions — escape &, <, >, quotes, and decode named, decimal, and hex entities back to text.
Encode EntitiesHTML Formatter
Format, indent, and prettify messy or minified HTML — or minify it back — entirely in your browser with adjustable indentation.
Format HTMLHTML to Markdown
Convert HTML markup into clean Markdown — headings, links, lists, emphasis, blockquotes, and code — entirely in your browser.
Convert to MarkdownHTTP Header Inspector
Paste a URL or response headers — see security headers, CORS, cache directives.
Use ToolHTTP Status Code Lookup
Look up any HTTP status code (100–599) — meaning, when to use, related codes.
Use ToolIP Address Validator
Validate IPv4 and IPv6 addresses and see their breakdown — class, integer, hex, binary, expanded form, and whether they fall in private, loopback, or reserved ranges.
Validate IPQuery String Builder
Build URL query strings from key-value pairs with proper percent-encoding, or parse and decode any URL's query parameters — instantly in your browser.
Build Query Stringrobots.txt Generator
Generate a valid robots.txt file with per-user-agent allow/disallow rules, crawl delay, sitemap URL, and host directive. Copy-paste ready, with warnings for common mistakes.
Generate robots.txtURL Parser
Break any URL into protocol, host, port, path, query parameters, and fragment — with subdomain, domain, and TLD detection. Parses live in your browser.
Parse URLWebSocket Tester
Open a WebSocket connection to any URL and send/receive messages from the browser.
Use ToolSuggest a Tool
Missing something? Let us know.
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