Developer Tools

JSON, Base64 and URL utilities that run locally — your data never leaves the page. Every tool runs in your browser — nothing is uploaded.

All developer tools

5 tools

JSON FormatterFormat and indent JSON, or minify it. Invalid JSON gets an error that points at the problem. Free, i… JSON ValidatorCheck whether JSON is valid, and get the exact position and likely cause when it is not. Free, insta… JSON to CSV ConverterTurn an array of JSON objects into CSV, ready for a spreadsheet. Free, instant, runs entirely in you… Base64 Encoder and DecoderEncode text to Base64 or decode Base64 back to text, with full Unicode support. Free, instant, runs … URL Encoder and DecoderPercent-encode text for URLs, or decode an encoded URL back to readable text. Free, instant, runs en…

About these tools

JSON, Base64 and URL utilities that run locally — your data never leaves the page. They share a small number of engines configured differently on each page — a target file size, and where a form demands it, exact pixel dimensions. The result is tuned to the specification you actually need to meet, rather than a generic "make it smaller" pass.

Processing happens on your device. Your files are never uploaded to a server, which is why there are no usage limits and no account to create.