Local-first · open source

Open Word, Excel & PowerPoint files, right in your browser.

No Office installed? View any DOCX, XLSX or PPTX instantly — and edit it when you need to. Everything runs on your device: no upload, no sign-up, works offline. Free with MacigHub.

Open a file New Word New Excel New PowerPoint
Close the tab by accident and nothing is lost: your edits are saved into this browser as you work. Saved copies stay for 7 days and are then deleted automatically — or delete them yourself at any time. Saved documents
0 bytes uploadedno accountworks offline.docx .xlsx .pptx .csv
Open a file

No Office installed? No problem.

.docx Open DOCX Word documents with fonts, tables and images intact. .xlsx Open XLSX Formulas, charts and multiple sheets, fully rendered. .pptx Open PPTX Slides with layouts, themes and media preserved. .pdf Open PDF Read, comment and annotate, then save it back. .odt .ods .odp Open OpenDocument LibreOffice formats — save back as ODT, DOCX or PDF. .docx → .pdf Convert to PDF Word, Excel and PowerPoint become PDFs on your device. .xlsx → .csv Convert between formats Spreadsheets to CSV and back, without uploading a byte.
Why it's different

Private by design, not by promise

100% client-side

Files never leave your device

Every document is opened, edited and saved locally. There is no server to upload to.

No account

Nothing to sign up for

No email, no login wall. Open the page and start editing immediately.

PWA · offline

Install it, use it on a plane

Add it to your home screen and it keeps working with no internet connection.

Free forever

Free for everyone

No trials, no locked features, no watermarks. Everything runs on your device with the MacigOffice engine.

Process

How it works

01

Open a file

Drop in a DOCX, XLSX, PPTX or CSV — or start a blank one.

stays on device
02

Edit for real

Full formatting, tables, charts and formulas, with full MacigOffice fidelity.

stays on device
03

Save it back

Export to the same format. Nothing was ever uploaded.

stays on device
FAQ

Questions, answered

Longer answers — file size limits, error codes, self-hosting — are in the help pages.

Can it save back into my own file, or only download a copy?

It saves back into your own file. The first save asks you to pick the file; every save after that writes straight into it, with no dialog and no duplicate in your downloads folder. This uses the browser's File System Access API, so it works in Chrome, Edge and other Chromium browsers; Safari and Firefox download a copy instead. Either way the file goes from the browser to your own disk and is never uploaded.

Are my files uploaded anywhere?

No. There is no server. Files are opened and saved locally on your device and are never uploaded — you can verify it in the network tab, or read the source.

Which formats can I edit?

Word (DOCX), Excel (XLSX), PowerPoint (PPTX) and CSV, running on the MacigOffice engine entirely in WebAssembly on your device.

What happens if I close the tab or refresh the page?

Nothing is lost. Your edits are saved into this browser as you work, so reopening the editor offers the document back and a refresh returns to it. The saved copies stay on your device for 7 days and are then deleted automatically; you can also delete any of them yourself at any time. Nothing is uploaded — the copies exist only in this browser.

Does it work offline?

Yes. It is an installable PWA — once loaded it keeps working with no internet, because all editing runs locally in your browser.

Do I need an account?

No account, no sign-up, no email. Open the page and edit.