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Almost everybody arrives at this category with the same problem: an archive in a format their computer refuses to open, and no wish to install a program to fix it once. Converting it to ZIP solves that, and ZIP is the one format every operating system has understood without help for decades.
Up to 100 files at once. Mixed formats are fine.
They convert one after another and download together as a ZIP.
7 formats in this category, 36 working conversions — 0 of them without your file leaving the device.
The archive format built into every operating system.
Compresses harder than ZIP but needs its own tool on most systems.
Bundles files without compressing them. The Unix packaging step, usually paired with GZ.
Compresses a single file. Combined with TAR it becomes the standard Unix archive.
Compresses better than GZ and takes noticeably longer doing it.
The strongest of the common Unix compressors. Standard for source and package downloads.
A proprietary archive format. Can be unpacked everywhere, created almost nowhere.
Somebody sent an archive on a machine that will not open it, or on a phone, and who wants one file out of it rather than all of them.
Somebody who needs several files bundled into one before sending them, usually on a machine where they cannot or would rather not install anything.
Windows, macOS and every Linux desktop open ZIP with nothing installed. 7Z compresses better and RAR often better still, but both need software the recipient may not have — which is why an archive that will not open is a far more common problem than an archive that is slightly too large.
Repacking does not recompress what is inside the archive in any way that loses data. The files that come out are byte-for-byte the files that went in; only the container around them changes.
We can open RAR archives and we deliberately cannot create them. This is a licensing constraint rather than a technical one: the licence for the RAR decoder explicitly permits extracting archives and forbids using it to build a compatible packer. That is a line we will not cross, so RAR appears here as a source and never as a target.
In practice this costs nothing. Nobody needs to *create* a RAR; what people need is to get out of one, and that works.
Yes. RAR is one of the formats we read, and ZIP is the target that opens everywhere without extra software. The reverse — creating a RAR — is not offered, because the decoder’s licence forbids using it to build a compatible packer.
Nothing inside is altered in a way that loses data. The files that come out are identical to the files that went in; only the container changes.
No. It is repacked in your browser and never leaves your device — which matters, because an archive is usually several files at once and often the ones somebody bothered to bundle up.
No. Without the password the contents cannot be read, so there is nothing to repack. Extract it locally with the password first.