Online Office Editor — Word, Excel, PowerPoint & PDF in your browser

Editing Office documents online — without giving up your files

A private alternative to cloud office suites

Most online office editors work by uploading your document to someone else's server, editing it there, and syncing it back. That is convenient — but it means a third party holds a copy of every contract, budget, and draft you touch.

This editor takes the opposite approach. The editing engines are compiled to WebAssembly and run inside your browser tab. When you open a .docx, .xlsx, or .pptx file, it is parsed locally; when you save, the result is written to your browser's own storage. There is no upload step to disable, because there is no upload at all.

What you can do with each editor

Because the engines understand the real Office formats (not approximations), round-tripping works: open a file you received, make changes, and save it back — colleagues using Word, Excel, or PowerPoint will see the same document. PDFs work the same way: your annotations are merged into the actual file, so they survive in any PDF viewer.

PDF editing: annotate and save — privately

The PDF editor opens any PDF and lets you add text annotations, draw freehand with the pen, highlight passages, and fill interactive forms. Everything happens locally in your browser.

Saving uses the same two-stage merge that server-based editors use: your annotations are compiled into a changes stream and merged into the original PDF by a WebAssembly converter. The result is a real, standard PDF — open it anywhere and your edits are there. No upload, no 'please sign up to download your own file'.

One honest limitation: offline PDF editing supports saving back to PDF only (converting a PDF to Word or images, and printing, are not available offline). If you need to convert a PDF, use our dedicated PDF converter tools.

Saving: browser library vs. downloading

The Save button (or Ctrl+S) stores the document in a local file library kept in your browser's IndexedDB. This is what makes the editor feel like an app: your files are still there when you come back tomorrow, without any account or cloud sync.

Two practical notes: the library belongs to this browser on this device (clearing site data removes it), so for anything important also export a copy to disk. And if you switch browsers or machines, bring the file with you the old-fashioned way — by downloading it.

Tips for a smooth session

• Large spreadsheets with thousands of formulas take a moment to recalculate — that is the WebAssembly engine working locally, not a slow connection.
• The editor keeps your work in the local library automatically on save; get into the habit of Ctrl+S after big edits, just like in a desktop app.
• If you only need to convert a document (for example docx to Markdown), our document converter tools are lighter-weight — this editor is for when you want to actually edit.