How does it decide a file changed?

It compares entries that share the same path across both archives and flags them as changed when their contents or metadata differ, while files present in only one archive are reported as added or removed.

What metadata does the comparison show?

For each entry it shows the file path, size, and last-modified date on both sides, so you can see not just that a file changed but how.

Does it compare nested folders inside the ZIP?

Yes. It reads the full path of every entry, so files in nested directories are matched and compared just like top-level files.

Is there a file-size limit?

Because the archives are read in your browser, very large ZIPs depend on your device's available memory. Typical project and release bundles compare quickly.

Are my ZIP files uploaded anywhere?

No. Both archives are read and compared locally in your browser, so their contents are never sent to a server or stored.

Zip File Diff Checker

Compare two Zip files and identify differences including added, removed, changed, and unchanged files with detailed metadata.

Old ZIP File

Upload first ZIP file

New ZIP File

Upload second ZIP file

About Zip File Diff Checker

Two ZIP archives can look the same on the outside while their contents have quietly diverged — a file added in a newer build, one removed, another changed even though its name stayed the same. Unzipping both and comparing folders by hand is slow and easy to get wrong, especially when the archives hold hundreds of entries.

This tool reads two ZIP files and produces a clear, side-by-side report: which files were added, which were removed, which changed, and which are unchanged, along with each entry's size and last-modified date. It's useful for verifying a release bundle against the previous version, auditing what a build process changed, or confirming that two backups really hold the same data.

Both archives are read entirely in your browser. The files inside them are never uploaded, so you can compare private builds, backups, or deployment bundles without them leaving your machine.

How to use Zip File Diff Checker

Upload the old ZIP
Select the first or baseline archive you want to compare against.
Upload the new ZIP
Add the second or updated archive. The tool reads both files locally.
Run the comparison
Start the compare and the tool lists every entry, classified as added, removed, changed, or unchanged.
Review the side-by-side details
Inspect the per-file size and last-modified metadata to confirm exactly what differs between the two archives.

Frequently asked questions

Text Diff Checker

Compare two texts side-by-side and highlight the differences between them.

Image Diff Checker

Compare two images and analyze their differences in type, size, resolution, and visual content.

File Size Estimator

Estimate original and compressed (gzip, brotli) sizes for text or files to gauge network transfer impact.