--- title: CRC32 Checksum hide_table_of_contents: true pagination_prev: constellation/frac/index --- The SheetJS `crc-32` library computes standard CRC32 and Castagnoli CRC32C checksums. It is a core component in ZIP file processing, powering XLSX, XLSB, ODS, NUMBERS, and other formats. The library is also available for standalone use on the SheetJS CDN[^1]. Source code and project documentation are hosted on the SheetJS Git server at https://git.sheetjs.com/sheetjs/js-crc32 #### Live Demos https://oss.sheetjs.com/js-crc32/ computes checksums of files and text. https://oss.sheetjs.com/js-crc32/large uses incremental file processing and Web Workers to compute checksums of large files. Since the file is processed in chunks, it is possible to compute checksums of files larger than 4GB. [^1]: See https://cdn.sheetjs.com/crc-32/ for more details.