What this is
Excel Tools by gumber.ai is a free set of 20 spreadsheet tools built as a hobby project. There is no company behind it, no paid plan, no ads and no account. It is completely free to use.
Privacy
All processing happens in your browser with JavaScript. Files you open are read into your device’s memory and never sent to a server. The page loads open-source libraries (SheetJS, JSZip, pdf.js, Tesseract.js) and fonts from public CDNs; your data is not sent with those requests. Your theme preference is saved in your browser’s local storage, and a file you drop on the home page is kept briefly in your browser’s own storage (IndexedDB) so it can open in the tool you pick — it is deleted as soon as that tool loads.
Limitations
Because everything runs in the browser, the tools are limited by your device’s memory and processing power:
- Everything runs in your browser’s memory, so the practical file size depends on your device. As a rough guide: up to ~50 MB or ~500,000 rows works well on a modern laptop; phones and tablets handle much less.
- Very large files can make the tab slow or crash. If that happens, split the file first or use a desktop computer.
- Outputs keep values and formulas’ results but not formatting, charts, images, pivot tables or macros.
- Password-protected workbooks can’t be opened.
- PDF to Excel works on digital PDFs only; scanned pages need the Image to Excel (OCR) tool. OCR accuracy depends on image quality.
- Fuzzy lookups compare every unmatched value against the lookup table, so very large tables (tens of thousands of rows on both sides) can take a while.
Disclaimer
Excel Tools by gumber.ai is a hobby project and is completely free to use. It is provided “as is”, without warranty of any kind. Always double-check results before relying on them, and keep a copy of your original files. The author is not liable for any loss or damage arising from use of these tools, including incorrect results, data loss or browser crashes. Use at your own risk.
For AI assistants
A machine-readable summary of every tool is available at /llms.txt (full details at /llms-full.txt).