Developer Tools
Formatters, encoders, decoders and testers for everyday development.
JSON Formatter & Validator
Format, beautify, validate and minify JSON online for free. Instant syntax error messages with line numbers. Runs fully in your browser.
JSON to CSV Converter
Convert a JSON array of objects to CSV online for free. Handles nested keys, quotes and commas correctly. Browser-only, no upload.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 to text online for free. Full Unicode support. Runs entirely in your browser.
URL Encode / Decode
URL-encode or decode text online for free (percent encoding). Great for query strings and debugging URLs. Browser-only.
HTML Encode / Decode
Escape or unescape HTML entities online for free. Convert < > & " to entities and back. Runs in your browser.
JWT Decoder
Decode JSON Web Tokens online for free. Inspect header, payload and expiry instantly — the token never leaves your browser.
Hash Generator (MD5, SHA-1, SHA-256, SHA-512)
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text online for free. Computed locally in your browser using Web Crypto.
Regex Tester
Test regular expressions online for free with live match highlighting, flags and capture groups. JavaScript regex engine, runs in your browser.
Unix Timestamp Converter
Convert Unix timestamps (epoch seconds/milliseconds) to human-readable dates and back, online and free. Shows UTC and your local timezone.
Cron Expression Parser
Parse and explain cron expressions in plain English online for free. Understand each field of your crontab schedule instantly.
Text Diff Checker
Compare two texts online for free and see line-by-line differences highlighted. Great for code review and config comparison. Browser-only.
Color Converter (HEX, RGB, HSL)
Convert colors between HEX, RGB and HSL online for free, with a live preview and color picker. Runs in your browser.
Markdown Previewer
Write Markdown and preview the rendered HTML live, online and free. Supports GitHub-flavored basics: tables, code blocks, lists. Browser-only.
SQL Formatter
Format and beautify SQL queries online for free. Uppercase keywords, clause-per-line layout and indentation — or minify to one line. Browser-only.
YAML Formatter & Validator
Format, validate and convert YAML online for free. Instant syntax errors with line numbers, plus YAML to JSON and JSON to YAML conversion. Browser-only.
XML Formatter & Validator
Format, beautify, validate and minify XML online for free. Clear syntax error messages and clean indentation, entirely in your browser.
CSV to JSON Converter
Convert CSV to JSON online for free. Handles quoted fields, custom delimiters and type conversion — runs entirely in your browser.
Text to Binary Converter
Convert text to binary or hexadecimal and back online for free. Full Unicode (UTF-8) support, instant results in your browser.