XLS to XLSX
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Step 1: Start the conversion by uploading your XLS file to our uploader on the right side. Just drag or drop your file, or you can simply click on it.
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Step 2: The file conversion from XLS to XLSX will start automatically and will be complete within just a few seconds.
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Step 3: Click the download button to save your XLSX file locally.
You can upload up to 20 files simultaneously.
Measured on our servers
What to expect when converting XLS to XLSX
Real numbers from every conversion on this tool since 24 October 2026. Nothing here is estimated: we record how long each job took and how large the files were. File names and contents are never stored.
1.4 s
Typical processing time
for a 0.1 MB file (median)
21
Conversions
since 24 October 2026
37 MB
Largest file converted
since 24 October 2026
-72%
Output size
about 72% smaller than the input
How long conversions take
share of all conversions
- under 1 s10%
- 1–10 s86%
- 10–60 s5%
- 1–5 min0%
- over 5 min0%
Times are server processing only, measured after the upload finished; upload and download are not included. Large files take longer, but the limit is the same for everyone: no account, no queue priority to buy. Updated 2026-10-26
