EditXLSX is a free browser spreadsheet editor: open .xlsx locally with no upload on the free path. Optional cloud sync is $5/year after sign-in. This page compares that path to the named alternative.
Quick comparison
| EditXLSX (local) | Typical upload editor | |
|---|---|---|
| File transfer to start | Read into your tab | Upload to their server |
| Server-side copy | None on local path | Usually yes (often time-limited) |
| Account wall | Optional | Often required or ad-gated |
| Engine | OnlyOffice WebAssembly | Varies (sometimes preview-only) |
| Verify the claim | Network panel + open source | Trust their privacy policy |
| Optional sync here | $5/year, explicit sign-in | N/A |
When to use this editor
- Privacy is the reason you searched
- You need real spreadsheet editing, not a static HTML table
- You want offline-capable editing after the first load
- You may later want cheap personal cloud without changing tools
When an upload tool might be enough
- The file is already public or disposable
- You only need a one-shot format conversion and accept their retention window
- You have no alternative network path and accept the risk
Honest limits
Local-in-browser still means your device does the work — huge workbooks can strain RAM. Upload tools that run conversion on a big server can feel faster for giant files, at the cost of sending the bytes away.
How to verify nothing is uploaded (local path)
- Open the browser network panel.
- Open a local
.xlsxin the editor. - Confirm there is no multipart upload of your workbook to a third-party edit API.
- Edit and download — still on-device.
Cloud workbooks after sign-in do store bytes in your account by design. That path is opt-in.
FAQ
What is EditXLSX?
A privacy-first browser editor for Word, Excel, and PowerPoint. Local editing runs in your tab; files are not uploaded on the free path.
Does my file upload?
No on the local path. Optional cloud workbooks after sign-in are an explicit choice.
Is it free?
Yes for local open and edit. Optional personal cloud sync on this site is $5/year.