SheetJS vs ExcelJS vs EatSheet

SheetJS converts between spreadsheet formats, ExcelJS creates and edits styled workbooks, and EatSheet shows workbooks in the browser. Pick by the job: all three can read an XLSX file, but only SheetJS and ExcelJS can write one, and only EatSheet renders it with its styles.

Best for

Converting formats

Creating styled workbooks

Showing files in the browser

Reads XLSX and CSV

Yes

Yes

Yes

Reads .xls, .xlsb and .ods

Yes

No

No

Writes files

Yes

Yes

No

Renders styled HTML

No, in SheetJS Pro

No

Yes

Calculates formulas

No

No

Common functions

Parses in a Web Worker

You set it up

You set it up

Built in

Gzipped browser build

328 KB

258 KB

27 KB

License

Apache-2.0

MIT

Apache-2.0

ExcelJS's size is its dist/exceljs.min.js file gzipped. Versions checked on November 7, 2026. For speed and memory, see the EatSheet and SheetJS benchmarks. ExcelJS wasn't benchmarked.

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