Excel spreadsheet
The legacy binary Microsoft Excel workbook format.
Best for older spreadsheet archives and Office compatibility.
XLS to XLSX
Updates legacy Excel XLS workbooks to XLSX. Add your files, convert them in one batch, and download each XLSX directly.
1-hour guest cleanupMalware scanned2 at once, 10 per day
How to convert XLS to XLSX
The converter runs in your browser and an isolated processing queue. Nothing to install, and every upload is scanned for malware before it is processed.
- 1Add your XLS filesDrop XLS files into the converter or choose them from your device. Guest files can be up to 25 MB each.
- 2Choose XLSXSet XLSX as the output for the whole batch, then change individual files if needed.
- 3Convert and downloadStart the batch and download each XLSX directly, or save it to your workspace to get a permanent link.
Excel spreadsheet
The modern XML-based Microsoft Excel workbook format.
Best for editable tables, formulas, and business data.
XLS to XLSX
What to expect from XLS to XLSX
What changes in the file, and what to check before you share the result.
Sheets and formulas carry over
Sheets, formulas, and basic formatting usually transfer between XLS and XLSX. Macros, some pivot table features, and some conditional formatting may not.
XLS to XLSX questions
Short answers about limits, privacy, and keeping the converted file.
Is the XLS to XLSX converter free?
Yes. Without an account you can convert up to 10 files a day, 2 at a time, up to 25 MB each. A free account adds monthly conversion credits and larger files.
How long are my files kept?
Guest uploads and results are deleted automatically after 1 hour. Conversions stay temporary when you are signed in too, unless you save a result to your workspace.
Can I get a permanent link to the XLSX file?
Yes. Save the result to a SteadyLink workspace and it gets a stable link. If you make a new version later, replace the file and the link stays the same.
Browse by file type
Each category has its own converter, format list, and common routes.
Images
JPG, PNG, WebP, AVIF, GIF, TIFF, BMP, HEIC, ICO, SVG
Documents
DOC, DOCX, ODT, RTF, TXT, HTML, PDF
Spreadsheets
XLS, XLSX, ODS, CSV, PDF
Presentations
PPT, PPTX, ODP, PDF
PDF, DOCX, JPG, PNG, TXT
Audio
MP3, WAV, AAC, FLAC, OGG, M4A, Opus
Video
MP4, WebM, MOV, AVI, MKV, GIF, MP3
Archives
ZIP, TAR, TAR.GZ, 7Z
Ebooks
EPUB, MOBI, AZW3, PDF, TXT
Keep the useful ones.
Conversions remain temporary even when you are signed in, so save a result to your workspace when you want a stable URL and revision history.
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