Add ZIP files
Choose two or more .zip files to combine into one archive.
Combine ZIP files, in your browser
This tool merges two or more .zip files into a single archive. Add your files, and every entry from each archive is written into one new ZIP you can download. The folder structure inside each archive is preserved, and your original files are left unchanged.
When the same path exists in two archives, nothing is silently overwritten. By default both are kept and the later one is renamed with a numeric suffix; you can switch to skipping duplicates instead. Either way, the tool reports how many name collisions it found.
Why your files stay on your device
Privacy here is structural, not a promise. There is no upload step because there is no server to upload to:
- The merge runs entirely in your browser.
- The page is served as static files and makes no request with your archive data.
- The source is open and anyone can read it (MIT).
- It works offline, which is only possible because nothing leaves the device.
If you want to check for yourself, open your browser's Network panel while merging — no request carries your files. Read the source.
How to use it
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Add ZIP files
Click to select two or more .zip files, or drop them anywhere on the page. You can add more at any time.
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Set the order and duplicate rule
Move archives up or down — on a name collision the earlier one keeps the original path. Choose whether duplicates are renamed or skipped.
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Merge and download
Combine everything into one ZIP and download it. The result shows how many files and collisions were handled; your originals are untouched.
FAQ
Are my files uploaded anywhere?
No. The merge runs entirely in your browser. There is no server component, so your files have no path off your device. The source is open and you can confirm this in your browser's Network panel.
What happens when two archives contain the same file name?
Nothing is silently overwritten. By default both files are kept and the later one is renamed with a numeric suffix (for example docs/readme.txt becomes docs/readme (1).txt). You can instead choose to skip duplicates and keep only the first. The tool tells you how many collisions it resolved.
Is the folder structure inside each ZIP preserved?
Yes. Every entry keeps its full path, so nested folders are carried over exactly. Empty folders are preserved too when the archive records them.
Does merging change my original ZIP files?
No. Your input files are read on the device and left unchanged. The tool produces a new combined archive for you to download; nothing is overwritten.
Can it merge password-protected ZIP files?
Encrypted entries can't be read without the password, so a protected archive can't be fully merged. Remove the password first, then combine the archives.
Does it work offline?
Yes. It is a PWA. After the first visit it is cached, so merging works without a network connection. You can also install it to your home screen.
Is there a limit on file size or number of archives?
There is no fixed limit. Because everything runs in your browser, the practical ceiling depends on your device's memory. Very large or numerous archives may be slower.