Convert XLS to CSV
Convert legacy Excel files to CSV — free, instant, and private. Files never leave your browser.
About Converting .XLS (XLS) to .CSV (CSV)
Converting files from XLS (.xls) to CSV (.csv) is essential for cross-platform compatibility, workflow archiving, and downstream application ingestion. Unlike traditional cloud converters that upload your files to third-party storage buckets, ViewAnyFile.app prioritizes local browser execution and ephemeral memory isolation.
This conversion pair runs 100% client-side inside your browser tab using WebAssembly and HTML5 APIs. Your .xls source file is read directly into an ArrayBuffer in local RAM, transcoded to .csv, and emitted as a downloadable Blob URL — zero bytes ever traverse the network.
How to Convert XLS to CSV
Select File
Drop your .xls file into the converter box above or click to browse
Convert Instantly
Click “Convert to CSV Now” — processing starts immediately
Download .CSV
Save your converted .csv file directly to your device
FAQ — XLS to CSV Conversion
How do I convert XLS to CSV?
Drop your .xls file into the interactive converter widget at the top of this page, click Convert, and download your .csv file immediately.
Is the XLS to CSV converter free?
Yes! ViewAnyFile.app's XLS to CSV converter is completely free with no account, watermark, or signup required.
Is it safe to convert XLS to CSV online?
Absolutely. Your file is processed entirely in your browser using WebAssembly and HTML5 APIs — it never leaves your device.
What is the maximum file size?
There is no hard limit for client-side conversions. Performance depends on your device RAM — most files under 100MB convert in seconds.