too-ly.eu — Free Online Developer Utilities
A free, browser-based toolkit for developers. All tools run entirely in your browser — no data is sent to any server. Please enable JavaScript to use the interactive tools.
JSON Validator & Formatter
Paste JSON to validate it instantly. Detects syntax errors with line and column information, auto-fixes common mistakes (trailing commas, single quotes, unquoted keys), and formats output with full syntax highlighting. Supports pretty-print and minify modes.
Code Minifier
Minify JavaScript, CSS, HTML, JSON, SQL and XML instantly in your browser. Strips comments and unnecessary whitespace, shows original size, minified size, bytes saved and percentage reduction. Download the result as a .min file. All processing is local — your code never leaves your device.
Data Converter
Convert data between JSON, XML, CSV, TSV, YAML, HTML Table, Markdown Table, and SQL INSERT statements instantly in your browser. Auto-detects your input format, lets you choose an output format, and supports drag-and-drop file loading. All processing is local — your data never leaves your device.
Code Beautifier & Formatter
Prettify and format JavaScript, CSS, HTML, JSON, SQL and XML instantly in your browser. Configurable indentation (2 spaces, 4 spaces, or tabs), JSON key sorting, and SQL keyword uppercasing. Paste minified code and instantly restore readable, indented output. All processing is local — your code never leaves your device.
Base64 Encoder & Decoder
Encode any text or binary file to Base64. Decode Base64 strings back to readable text. Includes URL-safe mode (replaces + with - and / with _), file drag-and-drop, and swap between encode and decode in one click.
Regex Tester & Debugger
Test regular expressions against a string with live match highlighting. Inspect every capture group by number and name. Preview replacement strings using $1, $2 and named group syntax. Get a token-by-token plain-English explanation of your pattern, and consult the built-in syntax cheatsheet — all without leaving the page.
QR Code Generator
Generate QR codes for URLs, plain text, WiFi credentials, vCard contacts, email, and phone numbers. Customize colors, size, and error correction level. Download as PNG. All processing runs locally — your data never leaves your device.