Developer Tools
Small, dependable utilities for everyday development work. Every tool runs client-side, so API responses, credentials and data samples never leave your machine.
JSON FormatterPaste minified or messy JSON and get a cleanly indented, readable version. Invalid JSON produces an error with the line and position of the problem.JSON MinifierStrip every unnecessary space and line break from JSON to get the smallest valid representation — with the size saving shown.JSON ValidatorCheck whether a JSON document is valid. Errors are reported with line and column, plus a plain-English explanation of the likely cause.CSV to JSONTurn CSV data — pasted or from a file — into a JSON array of objects, using the header row as keys. Quoted fields and embedded commas are handled correctly.JSON to CSVConvert a JSON array of objects into CSV that opens cleanly in Excel or Google Sheets, with correct quoting and a stable column order.URL Encode/DecodePercent-encode text for URLs, or decode %20-style strings back into readable text. Choose component encoding (strict) or full-URL encoding.Base64 TextConvert text to Base64 and back. Unlike naive implementations, this handles UTF-8 correctly, so emoji and non-Latin text round-trip safely.UUID GeneratorGenerate version-4 UUIDs using your browser's cryptographic random source. Create one or a batch, with uppercase and hyphen-free formatting options.Password GeneratorCreate strong random passwords with control over length, symbols, digits and ambiguous characters. Generated locally with cryptographic randomness — never transmitted.QR Code GeneratorCreate a QR code from any text or URL and download it as PNG or scalable SVG. No watermark, no expiry — the code is generated in your browser.
Private, browser-based processing
Every tool in this category runs entirely in your browser. Files and text are processed by JavaScript on your own device and are never uploaded to a server, so the tools are safe to use with confidential material and keep working at full speed regardless of your connection.