Developer Tools
Encode, decode, format, and validate. Essential utilities for developers that run entirely in the browser.
All Developer Tools (29)
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. Highlight duplicate keys, empty values, syntax issues.
Use Tool.gitignore Generator
Combine .gitignore templates for any stack — Node, Python, Rust, macOS, JetBrains.
Use ToolBase64 Encoder/Decoder
Encode plain text to Base64 or decode Base64 back to text — Unicode-safe, instant, browser-only.
Encode / DecodeCSS Gradient Generator
Generate beautiful CSS linear and radial gradients.
Generate GradientDiff Checker
Compare two blocks of code and highlight line differences.
Check DiffDNS Record Lookup
Look up A, AAAA, CNAME, MX, TXT, NS records for any domain via public DNS resolvers.
Use ToolHTML Entity Encoder
Encode and decode HTML entities — &, ', <, > — both directions.
Use ToolHTML Formatter
Format and prettify HTML markup for readability.
Format HTMLHTML to Markdown
Convert HTML markup to clean Markdown text.
Convert HTMLHTTP 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. Detect private/public ranges and reserved blocks.
Use ToolQuery String Builder
Build URL query strings from key-value pairs with proper percent-encoding.
Use Toolrobots.txt Generator
Generate robots.txt with allow/disallow rules per user-agent and sitemap reference.
Use Toolsitemap.xml Generator
Generate a valid sitemap.xml from a list of URLs with lastmod, priority, changefreq.
Use ToolURL Parser
Break a URL into protocol, host, port, path, query params, and fragment. Edit live.
Use ToolWebSocket Tester
Open a WebSocket connection to any URL and send/receive messages from the browser.
Use ToolSuggest a Tool
Missing something? Let us know.
Related Categories
Explore more tools you might need
YouTube Tools
17+ tools
Image Tools
25+ tools
Calculators
24+ tools
Converters
21+ tools
PDF Tools
12+ tools
Text Tools
23+ tools
SEO Tools
10+ tools
Data Tools
16+ tools
Social Media Tools
12+ tools
Email Tools
8+ tools
Security Tools
14+ tools
Date & Time Tools
18+ tools
URL & Link Tools
8+ tools
Finance Tools
14+ tools
Health & Fitness
12+ tools
Education Tools
8+ tools
Productivity Tools
16+ tools
AI Tools
11+ tools
India Tools
15+ tools
Design Tools
20+ tools