Verify: 0 uploads
Every BrainCoder tool runs 100% in your browser. This page proves it — with a live network audit you can watch, and a demo file you can hash without a single byte leaving your device.
The audit below intercepts fetch and XMLHttpRequest. If a tool ever tried to upload your file, it would be caught and shown here in red.
Live network audit
This panel hooks the browser's network APIs the moment the page loads and logs anything that tries to send data anywhere.
0
upload attempts detected
0
outbound requests
—
no file watched yet
drop a file below — the audit begins the moment you do.
Try it — hash a file right now
Pick any file and watch the audit stay at zero while its SHA-256 fingerprint is computed locally with the Web Crypto API.
Live demo — drop a file, it's hashed locally
Uses the browser's own Web Crypto API. No server involved.
copy the hash elsewhere, edit the file, repeat — the only way the digest changes is if a server round-trip had been involved.
How can tools run without a server?
Modern browsers are powerful enough to do the heavy lifting on device — so we do.
Static delivery
The site is a static Next.js build served from a CDN. Your browser downloads code, not a processing service.
Client-side engines
PDFs are handled by pdf.js / pdf-lib, images by canvas + WASM, text by JS — all bundled and run in your tab.
Nothing to send
Processing reads the file into memory, transforms it, and emits a download link via a Blob URL. No request exists to upload anything.
Open source
The entire codebase is public. You can read every tool's implementation and confirm nothing phones home.
How to verify it yourself
- 1
Open any tool on this site — say the PDF Compressor.
- 2
Open your browser's Developer Tools (F12) — Network tab.
- 3
Process a file, watch the request log.
- 4
You'll see static assets load once… and never a request carrying your file. Because there isn't one to make.
The only traffic this site generates is loading its own static assets and your privacy-respecting, aggregate analytics beacon — neither ever contains file content.
Free forever — nothing to install, nothing to upload
Every language, format and file type has a tool here — and each one runs on your device just like the demo above.
Browse all tools