Archive tools 15

Create and extract zip and tar archives, compress or decompress gzip, zlib and deflate streams, split large files into parts and join them back. All of it runs locally, so an archive holding sensitive files never crosses a network.

Zip & tar4

n→1Create ZIPBundle files into a single .zip.1→1Extract ZIPUnpack a .zip into its files, on your device. Refuses an archive whose own headers declare more than 1 GB of uncompressed content, so a decompression bomb cannot take the page down with it.n→1Create tarBundle files into a plain (uncompressed) .tar, on your device. Hand-rolled USTAR, so see Extract tar for what it does not handle.1→1Extract tarUnpack a plain (uncompressed) .tar into its files, on your device. Hand-rolled USTAR reader: regular files and nested paths only; GNU long-name and PAX extended headers (common for paths over 100 bytes from some tars) are rejected with a clear error rather than mis-read, and it does not decompress .tar.gz/.tar.bz2/etc, only plain .tar.

Compress a stream6

n→nGzip compressGzip compress a file locally. Nothing leaves your device.n→nGzip decompressGzip decompress a file locally. Nothing leaves your device.n→nDeflate compressDeflate compress a file locally. Nothing leaves your device.n→nDeflate decompressDeflate decompress a file locally. Nothing leaves your device.n→nZlib compressZlib compress a file locally. Nothing leaves your device.n→nZlib decompressZlib decompress a file locally. Nothing leaves your device.

Split & join2

1→1Split large fileCut a file into fixed-size parts named <name>.partNNN, on your device. Not the same naming as the Unix split(1) tool.n→1Join split filesConcatenate parts back into one file, in filename order. Pairs with Split large file. For a recognised .partNNN set, a gap at the start or in the middle is detected and refused (e.g. part001 or part003 missing). A gap at the end (the last part missing entirely) cannot be detected from the parts alone, so verify the count yourself.

Verify & convert3

1→1Checksum verifyCompare a file against an expected checksum, computed locally.n→nData URI generatorEmbed any file as a base64 data: URI.n→nLine-ending & BOM normalizerRewrite a text file to consistent line endings and BOM handling, on your device. Refuses input that is not valid UTF-8 text. This is not a binary-safe tool.

Questions

Are my archives uploaded?

No. Zip, tar, gzip, zlib and deflate all run in this tab through fflate and a local tar implementation. An archive of private documents never crosses a network.

Which formats can I extract?

Zip and tar, plus raw gzip, zlib and deflate streams. Zip extraction caps at 1 GiB declared in the header, and the tool page is explicit that an archive lying about its size is outside what that guard covers.

Can I split a large file to email it?

Yes. Split file cuts a file into numbered parts and Join files puts them back. The joiner cannot tell that a trailing part is missing, so check the count before you rely on the result.

What metadata do created archives carry?

As little as possible: fixed permissions, uid 0 and a zero timestamp, so building the same input twice gives the same bytes and no path from your machine leaks into the archive.

Do these work offline?

Yes. The compression code is part of the site bundle, which is precached on your first visit.