Developer Tools

Formatters, encoders, and converters for everyday coding tasks. Everything runs in your browser.

Runs in your browser — nothing uploaded
JSON Formatter & BeautifierFormat, beautify, and validate JSON instantly in your browser. Your data never leaves your device.JWT Decoder & VerifierDecode and verify JSON Web Tokens (JWT) in your browser. HS256, RS256, ES256 supported. Tokens and keys never leave your device.Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text instantly in your browser. Unicode-safe. Nothing is uploaded.URL Encoder & DecoderEncode and decode URLs and query parameters in your browser. Handles full URLs and individual components. Always private.UUID GeneratorGenerate cryptographically random UUIDs (v4) in your browser. Bulk-generate, copy one, or copy all. Nothing leaves your device.Password GeneratorGenerate strong, random passwords in your browser. Choose length, character types, exclude lookalikes. Nothing is sent to any server.Hash Generator (MD5, SHA-256…)Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text in your browser. Verify checksums without leaking the input.Regex TesterTest JavaScript regular expressions in real time. See matches, capture groups, and flags as you type. Pattern and text stay in your browser.HTML MinifierMinify HTML by stripping comments, collapsing whitespace, and tightening tags. Runs entirely in your browser.CSS MinifierMinify CSS by removing comments, whitespace, and trailing semicolons. Fast, private, browser-only.SQL FormatterBeautify SQL queries with consistent indentation and casing. Supports MySQL, PostgreSQL, SQL Server, SQLite, BigQuery, and more. All client-side.Cron Expression ParserTranslate a cron expression into plain English and preview the next runs. Supports standard 5-field cron plus shorthand like @daily and @hourly.CSV ViewerPaste or drop a CSV file and read it as a clean, searchable table. Auto-detects delimiter and headers. Files never leave your browser.JSON ValidatorPaste JSON and find out instantly whether it parses. Pinpointed line and column for syntax errors, structure stats when it's valid. Runs in your browser.JSON MinifierStrip whitespace from JSON for compact transport. See the byte savings and the compression ratio side-by-side. All in your browser.HTML Entity Encoder & DecoderEncode and decode HTML entities — named like & and ©, numeric like €, hex like €. Live preview. All in your browser.Meta Tag Generator (SEO + Open Graph + Twitter)Build the full set of SEO, Open Graph, and Twitter Card meta tags from one form. Live preview of Google, Facebook, and Twitter cards. All client-side.Robots.txt GeneratorBuild a robots.txt file from a simple form. Per-bot allow/disallow rules, crawl-delay, sitemap URL. Validates as you type, copy or download. Always private.