Does it open the compressed data?

No. Comparing only reads each archive’s file index — names, sizes, and compression metadata. Actual file contents stay compressed, which keeps the tool fast even on multi-gigabyte archives.

Can I compare archives of different formats?

Yes. Drop a ZIP on one side and a 7z on the other and the diff works. Paths are compared as strings, so identical folder structures across formats diff cleanly.

What does a size mismatch mean?

Two files with the same path but different uncompressed sizes have been modified between the two snapshots. Identical sizes usually mean the contents match, but they are not a cryptographic guarantee — use a hash tool for that.

Are the archives ever uploaded?

No. Both archives are read into the current browser tab and diffed there. They never travel over the network.

Compare Archives

Inspect · ZIP · 7z · RAR · TAR · GZ

1. Drop archive A

Archive A — drop a ZIP, 7z, RAR, TAR, or GZ

Select a file

2. Drop archive B

Archive B — drop a ZIP, 7z, RAR, TAR, or GZ

Select a file

Inspect ArchiveView the contents, sizes, and metadata of any archive without extracting it.
Estimate CompressionSee how small your files get at each ZIP level — store, fast, normal, max — before you commit.
Checksum ArchiveSHA-256 and SHA-1 for a ZIP archive and every file inside. Verify integrity without uploading.
Create ZIPCombine files and folders into a ZIP archive with adjustable compression levels.

Compare Archives

1. Drop archive A

2. Drop archive B

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