Compress an Excel spreadsheet
Make a .xlsx small enough to email by recompressing oversized photos inside it. Text, formatting and everything else stay exactly the same.
Free forever · Runs on your device · 0 bytes uploaded
Speed depends on your device; big files on phones take longer. Slow or not working? Report it on GitHub
How to compress Excel
- Add one .xlsx file (from Excel or Google Sheets).
- Choose Balanced or Strong compression.
- Click “Compress Excel” and download the smaller file.
Also good for
- reduce Excel file size
- compress XLSX with images
- make spreadsheet smaller for email
- shrink XLSX
- compress Excel free
Private by design — and you can check
Your files are never uploaded, because there is nowhere to upload them to.
- No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
- The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
- See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
- Open sourceEvery line is on GitHub, built on qpdf, pdf.js & pdf-lib.
Frequently asked questions
Are my files uploaded anywhere?
No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.
How much smaller will it get?
Files with large photos often shrink by half or more. Files that are mostly text are already compact; if Fizzdoc cannot make a file smaller, it tells you and keeps the original.
Does it work with Google Sheets?
Yes. In Google Sheets, choose File → Download → Microsoft Excel (.xlsx), then add that file here. Nothing is sent to Google or to us.
Is Fizzdoc free?
Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.
More private tools
- Excel to CSVExport every sheet of an .xlsx to CSV.
- CSV to ExcelTurn a .csv into a proper .xlsx workbook.
- Excel to JSONTurn spreadsheet rows into clean JSON objects.
- JSON to ExcelTurn JSON into a spreadsheet with a header row.
- Remove Excel MetadataErase author, company and editor names from a .xlsx.
- Extract Images from ExcelSave every picture in a .xlsx at original quality.
- Merge PDFCombine several PDFs into one, in the order you choose.
- Split PDFExtract the pages you need into a new PDF.