utili.dev
Free, fast developer tools that run entirely in your browser.
JSON Formatter
Format, validate, and beautify JSON instantly in your browser.
Open tool →Diff Checker
Compare two pieces of text and see the differences highlighted.
Open tool →Regex Tester
Test regular expressions with live highlighting and AI plain-English explanations.
Open tool →Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to readable text. Supports standard and URL-safe variants.
Open tool →Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Live ticker, offset calculator, all formats.
Open tool →UUID / GUID Generator
Generate UUID v4, v7, and NanoID in bulk. Includes a real-time UUID validator.
Open tool →JWT Decoder / Inspector
Decode and inspect JWT tokens — header, payload, expiry, and security warnings. Your tokens never leave your browser.
Open tool →MD5 Hash Generator
Generate MD5 hashes from text or files instantly. Includes a hash verifier. Everything runs in your browser.
Open tool →HTML Formatter / Beautifier
Format and beautify HTML with configurable indentation, or minify HTML to reduce file size.
Open tool →Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and 9 more naming conventions instantly.
Open tool →SQL Formatter / Beautifier
Format and beautify SQL with configurable keyword case, indentation, and dialect support. Supports MySQL, PostgreSQL, SQLite, T-SQL, and BigQuery.
Open tool →CSV to JSON Converter
Convert CSV to JSON and JSON to CSV instantly in your browser. Supports custom delimiters, quoted fields, and automatic type detection.
Open tool →URL Encoder / Decoder
Encode and decode URLs and query strings. Supports URL component and full-URL modes with query parameter breakdown.
Open tool →