Privacy by architecture
Your files never leave your browser
Most file tools upload your documents to their servers. Filecraft doesn't. Every file is processed locally in your browser — we never see your content.
How Filecraft is different
Other file tools
- Upload your file to their server
- Process it on their infrastructure
- Your file passes through unknown systems
- You trust them to delete it afterwards
- No way to verify what happens to your data
Filecraft
- Files stay in your browser — never uploaded
- Processing runs locally using Web Workers
- We never see your file contents or names
- Nothing to delete — we never had it
- You can verify this yourself in DevTools
Don't take our word for it
Open your browser's developer tools (F12), go to the Network tab, and process a file. You will see zero requests carrying file data to our servers. This is not a claim you need to take on trust — you can confirm it in 30 seconds.
Every tool on Filecraft works the same way: your file is read into browser memory, processed using standard web APIs and Web Workers, and the result is offered as a download. At no point does the file content leave your machine.
How it works
You select a file
Your file is read from disk into browser memory. It never touches a server.
Processing runs locally
Web Workers process the file using JavaScript — the same technology that powers your browser.
You get the result
The processed file is offered as a download. It goes from browser memory to your disk.
Memory is cleared
Temporary data is released. No file content is stored, cached, or retained.
Cloud integrations
Pro plans can import files from OneDrive and SharePoint and save results back. Even then, your files never pass through Filecraft servers:
Your browser authenticates directly with Microsoft. We never see your credentials.
The file is downloaded from Microsoft into your browser — not through our servers.
Processing happens locally, same as any other file.
The result is uploaded from your browser directly to your cloud storage.
Technical controls
Content Security Policy
HTTPS and HSTS
No telemetry on file contents
File size enforcement
Worker isolation
Dependency policy
Enterprise: server-assisted processing
For files too large to handle in the browser, Enterprise accounts can optionally enable server-assisted processing. This requires your explicit consent before each use and is clearly separated from the default local flow. It is not available on Free, Pro, or Team plans.