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We use jszip for parsing xlsx/xlsm/xlsb files in the browser (Excel 2007+ files are zip files that contain XML or binary files in specific locations): https://github.com/SheetJS/js-xlsx

JSZip works well for small files, but unzipping XLSB files larger than 50M seem to cause out of memory issues in Firefox

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This project is great, because it's something I never envisioned for the library!

You may want to take a look at the master branch, because we've recently updated our inflate/deflate implementation to use the much faster Pako, https://github.com/nodeca/pako

Have you considered zip.js instead? It claims to work with files up to 4GB. It also can zip large files without any issues for me in Firefox.

When we first evaluated options, zip.js only supported IE9+ (and IE6-8 were still relevant browsers) while JSZip supports IE6+. In fact, the Base64 text box was introduced in http://oss.sheetjs.com/js-xlsx/ specifically to test IE6-9 (which do not support the HTML5 File API)

I see. Inevitably its support for older browsers makes it slower, however.

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