Private · 100% on-device
Looking for a Document Editor That Keeps Your Files Private?
Edit Word (DOCX), Excel (XLSX), PowerPoint (PPTX) and CSV files right in your browser — where the file stays on your own device from start to finish. Nothing is uploaded, and there is no account to create.
Privacy here is simple and literal: the document you open never leaves your computer. Everything runs locally in your browser with WebAssembly, so opening, editing and downloading all happen on your machine. There is no server-side copy of your file to worry about, and no cloud folder syncing it somewhere else.
That makes it a good fit for contracts, financial spreadsheets, medical notes, HR paperwork or anything else you would rather not hand to a third party. You get a full-fidelity editor — powered by the OnlyOffice engine, so fonts, tables, formulas and layout are preserved — without the trade-off of sending the file away first.
What you can do
- Keep every file on-device — 100% client-side; your documents never leave your machine.
- Edit the common formats — DOCX, XLSX, PPTX and CSV, with full formatting preserved.
- Skip the account — no sign-up, no login, nothing to register.
- Work offline — installable as a PWA and usable with no connection.
- Verify the privacy claim — read the open-source code or self-host your own copy.
How it works
- Open the editor — there is no sign-up screen in the way.
- Pick a DOCX, XLSX, PPTX or CSV file from your device.
- Read and edit it locally; the file is processed in your browser, not on a server.
- Download your changes back to your device when you are done.
Frequently asked questions
What makes this a private document editor?
Your files are opened and edited entirely inside your own browser with WebAssembly. The document is never uploaded to a server, so it stays on your device the whole time.
Do my files ever get uploaded?
No. All processing is 100% client-side. Your DOCX, XLSX, PPTX or CSV file is read and written locally and never leaves your device.
Do I need an account to keep my files private?
No account, no sign-up and no login. You open the editor and start working immediately, and there is no cloud copy of your document to manage.
Can I verify that nothing is uploaded?
Yes. The whole editor is open source under the AGPL-3.0 license, so you can read the code, watch the network tab, or self-host your own copy.
Does it still work without an internet connection?
Yes. It is an installable PWA and works fully offline once loaded, which keeps your editing self-contained on your machine.