Developer Tools
Session-local minify, format, encode, and test utilities for JSON, HTML, CSS, JavaScript, SQL, UUID, Base64, JWT, regex, and cron - all in your browser, no upload.
What you can do here
- Minify and format JSON, HTML, CSS, JavaScript, and SQL without leaving the tab
- Encode Base64, generate UUIDs, hash strings, and decode JWTs client-side
- Test regex patterns and cron expressions with instant feedback
JSON Minifier & Formatter
Free online JSON minifier and formatter. Minify JSON to shrink payloads or beautify (pretty-print) JSON with 2-space indentation. Validates as you go - no upload required.
HTML Minifier
Free online HTML minifier. Compress and minify HTML by removing comments and collapsing whitespace - smaller files, faster page loads. Runs in your browser, no upload required.
CSS Minifier
Free online CSS minifier. Compress and minify CSS by removing comments and collapsing whitespace - smaller stylesheets, faster page loads. Runs in your browser, no upload required.
JavaScript Minifier
Free online JavaScript minifier. Compress and minify JS by removing comments and collapsing whitespace - smaller files, faster page loads. Runs in your browser, no upload required.
UUID Generator
Generate UUID v4, UUID v7, ULID, or NanoID in your browser. Create one or many IDs for databases, APIs, and testing - nothing is uploaded.
Base64 Encoder / Decoder
Free online Base64 encoder and decoder. Encode text to Base64 or decode Base64 back to plain text, with full Unicode (UTF-8) support - runs entirely in your browser.
Image to Base64 Converter
Convert an image to Base64 or a data URL in your browser - your image never leaves your browser. Paste screenshots, copy CSS/HTML/Markdown snippets, or decode Base64 back to a downloadable file.
Text to Binary Converter
Convert text to binary and binary back to text instantly. Free ASCII/UTF-8 text-to-binary translator and encoder in your browser.
URL Encoder / Decoder
Encode or decode percent-encoded URLs, or build and parse query strings from key/value pairs. encodeURIComponent, encodeURI, and parse-back - all in your browser.
Hash Generator
Generate SHA-256, SHA-1, SHA-384, and SHA-512 hashes from any text. HMAC lives on the same page. Get the lowercase hex digest instantly in your browser - nothing is uploaded.
Bcrypt Hash Generator
Free bcrypt hash generator and verifier in your browser. Hash passwords with configurable rounds, then verify hashes locally - nothing is uploaded.
JWT Decoder
Decode JWT header, payload, and signature in your browser. Encode HS256 test tokens on the same page. Free JSON Web Token decoder - nothing uploaded.
Regex Tester
Test JavaScript regular expressions in your browser. See match groups, flags, and highlights - nothing is uploaded.
Cron Expression Generator
Build or paste a Unix cron expression in your browser. See plain-English meaning, field-by-field breakdown, next 5 run times, and copy crontab or GitHub Actions snippets. Nothing is uploaded.
SQL Formatter & Minifier
Free SQL query formatter online and SQL minifier online. Beautify SELECT/JOIN/CTE queries or minify to one line in your browser - production SQL never leaves your device.
XML Formatter & Minifier
Free XML formatter online and XML minifier online. Beautify or compress XML, SVG, RSS, and config files in your browser - nothing is uploaded.
JSONPath Tester
Test JSONPath online in your browser. Extract a field from JSON, try a filter example, and copy normalized paths - nothing is uploaded.
JSON to TypeScript Interface Converter
Free JSON to TypeScript interface converter. Paste a JSON sample, generate nested interfaces or type aliases, and keep optional keys separate from JSON null. Nothing is uploaded.
User-Agent Parser
Free User-Agent parser in your browser. Paste a UA string to detect browser, OS, device, engine, and bots - nothing is uploaded.
PEM Certificate Decoder
Free PEM certificate decoder in your browser. Paste an X.509 PEM to read subject, issuer, validity, SANs, and fingerprints - nothing is uploaded.
JSON Schema Generator
Free JSON Schema generator in your browser. Paste sample JSON, infer types and formats, and copy a Draft-07 or 2020-12 schema. Nothing is uploaded.
JSON Diff Checker
Free structural JSON diff in your browser. Compare two JSON documents by keys and values - not line order. Nothing is uploaded.
Chmod Calculator
Free chmod calculator in your browser. Toggle rwx for owner, group, and other, convert to octal, and copy a chmod command. Nothing is uploaded.
Browse 23 free developer tools on ToolsMinify. Session-local minify, format, encode, and test utilities for JSON, HTML, CSS, JavaScript, SQL, UUID, Base64, JWT, regex, and cron - all in your browser, no upload.