12 tools live · nothing leaves your machine

Developer tools that never see your data

Paste the API response with the live bearer token in it. Drop the export with real customer emails. It stays on your machine, because there is nowhere for it to go.

JSON tools How we prove it

Available now

JSON

12 tools

Format, convert, diff and de-secret JSON.

Formatter Minifier JSON → TypeScript JSON → Zod JSON → JSON Schema JSON → CSV JSON → YAML YAML → JSON Flatten / unflatten JSON diff JSONPath tester Secret & PII scanner

Being built

We have not built these yet, so each one points at whoever does it best today — labelled with whether it actually runs on your device. These pages get replaced by our own tools, at the same address.

CSV & spreadsheets

next up

Convert, clean and inspect tabular data.

Regex

curated

Build, test and understand regular expressions.

PDF

curated

Merge, split, compress and edit PDFs.

Images

curated

Compress, convert and strip metadata.

Encoding & crypto

curated

Base64, hashes, ciphers and data mangling.

JWT & tokens

curated

Decode and inspect tokens and certificates.

How we prove it

Nothing is uploaded

Each tool is a pure function running in your tab. The pages ship a Content-Security-Policy that forbids network connections outright, so this is enforced by your browser rather than promised by us.

No account, no limits

No sign-up, no file cap, no watermark, no "upgrade to convert more than three files". There is no server to meter.

Works offline

Load a page once, then turn off your network. Everything keeps working — which is the only demonstration of the first point that actually counts.

Every deploy runs an automated check that loads a real page, confirms the tools still work, then tries to exfiltrate data by every means a browser offers — fetch, XHR, WebSocket, beacon, remote module, image pixel. If any of them gets a response, the deploy fails. The check is in the repo.