I kept doing the same thing: copy a string, guess if it's JSON/Base64/URL-encoded, open the right tool, paste. Ten times a day.

So I built PureMark — browser-based dev tools that auto-detect what you paste and process it immediately. No sign-up, no server, everything stays in your browser.

Tools: JSON Formatter, Base64, URL Encoder, Diff Checker, Timestamp Converter.

What makes it different: - Zero-click: paste and it just works - Recipe URLs: share formatted results via URL (data in the hash, never sent to a server) - Chrome extension that auto-detects clipboard format and opens the right tool - Myers diff implemented from scratch (~130 lines, zero dependencies)

Try it: https://json.puremark.app — paste any JSON.

Would love feedback on the detection algorithm and what tools to add next.