Free Online Developer Tools
20 free browser-based developer tools — no sign-up, no server uploads, all processing happens in your browser.
Regex Tester & Debugger — Free Online Tool
Test and debug regular expressions with real-time matching, live highlighting, capture groups, and a built-in cheatsheet. Free regex tester with flags support (g, i, m, s)
JWT Decoder & Debugger
Decode and debug JSON Web Tokens online. Verify HS256 & RS256 signatures, check expiration, inspect header & payload claims. 100% client-side.
Diff Checker
Compare two texts and find differences with unified and side-by-side views
SQL Formatter & Beautifier
Format, beautify, and minify SQL queries online. Supports MySQL, PostgreSQL, SQLite, SQL Server, Oracle dialects with configurable indentation and keyword casing
HTML Beautifier & Formatter
Beautify, format, and minify HTML with proper indentation and void element handling
XML Formatter & Validator
Format, validate, beautify, and minify XML online. Syntax highlighting with line numbers, well-formed XML checking with error location, and download as .xml file.
JavaScript Minifier & Beautifier
Minify and beautify JavaScript with safe string, template literal, and regex preservation
Cron Expression Parser
Parse cron expressions into human-readable schedules with next run times and syntax reference
Cron Expression Generator
Build cron expressions visually with dropdowns, preset templates, human-readable descriptions, and next run time previews. Reverse-parse any cron expression
YAML Formatter & Beautifier
Format, beautify, minify, and sort YAML with proper indentation for Kubernetes, Docker, and config files
TOML Formatter & Validator
Format, beautify, minify, sort, and validate TOML files for Cargo.toml, pyproject.toml, and configs
IP Address Lookup & Subnet Calculator
Find your public IP with geolocation, look up any IP address, and calculate subnets with CIDR notation
Unix Timestamp Converter & Epoch Tool
Convert Unix timestamps to human-readable dates and back. Live counter, timezone selector, milliseconds toggle, and common timestamps reference table
HTTP Status Codes Reference
Complete HTTP status codes reference. Search all HTTP response codes from 100 to 511 with descriptions, common use cases, and category filters. Find what 404, 500, 301, 429 and every other status code means
Chmod Calculator
Interactive Unix file permission calculator. Convert between numeric (755, 644) and symbolic (rwxr-xr-x) permissions with checkboxes, common presets, and ready-to-copy chmod commands
HTTP Headers Analyzer
Parse, categorize, and audit HTTP headers with plain-English explanations, security scoring, and export as curl or JSON. Paste raw headers from DevTools or curl.
Markdown to HTML Converter
Convert Markdown to clean HTML online. Live preview, raw HTML view, copy button. Supports headings, tables, code blocks, lists, links, images, blockquotes, horizontal rules. 100% client-side.
Open Graph & Meta Tag Generator
Free Open Graph and meta tag generator. Create og:title, og:description, og:image, Twitter Card tags and more. Live preview shows exactly how your page looks when shared on Facebook, Twitter/X, LinkedIn, Discord, and Slack.
Open Graph & Meta Tag Generator
Generate Open Graph and Twitter Card meta tags instantly. Preview how your page looks when shared on social media. Copy ready-to-paste HTML.
Cron Expression Generator
Free online cron expression generator. Visually build cron schedules with minute/hour/day/month/weekday selectors. See human-readable description and next 5 run times instantly.