Merge ZIP Files

Merge ZIP files online: combine several ZIP archives into one, each in its own folder or flattened together. Free and private, files are never uploaded.

Files are processed in your browser and never uploaded.

How to merge ZIP files

  1. Drop two or more ZIP files onto the drop zone above, or click to choose them. You can add more archives before merging.
  2. Choose a Layout:
    • One folder per ZIP – the contents of each source archive go into a folder named after that ZIP.
    • Merge everything into one folder – all files are combined at the same level, keeping whatever folder paths they already had.
  3. Set the Archive name. It defaults to merged, giving merged.zip.
  4. If the sources are encrypted, enter the password in Password (only if the archive is encrypted). The same password is used for every archive.
  5. Click Merge ZIP files and download the combined archive.

The archives are read and rewritten in your browser, so nothing is uploaded to a server.

Which layout should you use?

The right layout depends on whether the source archives contain overlapping file names. Suppose you merge january.zip and february.zip, and both contain a file called summary.xlsx:

One folder per ZIPMerge everything into one folder
Resulting pathsjanuary/summary.xlsx
february/summary.xlsx		summary.xlsx
summary (2).xlsx
Can you tell where a file came from?Yes, from the folder nameOnly from the original folder paths, if any
Best forMonthly exports, submissions from different people, backups taken on different daysPhoto sets or downloads that were split across several ZIPs

In both layouts nothing is overwritten: when two files would land on exactly the same path, the later one gets " (2)", " (3)" and so on added to its name. With the flat layout, folders that existed inside the source archives are still kept, so a.zip containing img/1.jpg and b.zip containing img/2.jpg end up sharing one img folder.

What carries over and what does not

  • Dates – each file keeps the modification date stored in its source archive.
  • Passwords – encrypted sources are decrypted with the password you enter; the merged ZIP is written without a password. Add one afterwards if needed.
  • Empty folders – only files are copied, so folders with no files inside are not recreated.
  • Mac metadata – __MACOSX/ folders and ._ files that macOS adds to archives are skipped, so they do not clutter the merged ZIP.
  • Size – every source is unpacked in browser memory before the new ZIP is written. A combined total over roughly 700 MB is slow, and more than 2 GB is refused.

Tips

  • Protect the merged result with Password Protect ZIP, choosing AES-256 or ZipCrypto.
  • Need to rename or remove a few files after merging? Open the result in Edit ZIP.
  • Got a RAR or 7Z among your archives? Convert it first with RAR to ZIP or the Archive Converter, then merge.
  • If the merged archive is too large to send, cut it into standalone parts with Split ZIP.
Tip: Rename the source ZIPs before merging with "One folder per ZIP". A clear name like client-a.zip becomes a clear folder name in the result, while download (3).zip does not.

Frequently asked questions

Can I merge parts created by Split ZIP back into one archive?

Yes. Each part is an ordinary ZIP, so add them all and choose "Merge everything into one folder" to get the original file layout back in a single archive.

Can I merge .z01/.z02 split volumes?

No. Multi-volume ZIP sets made by WinZip or 7-Zip are pieces of one archive rather than separate ZIPs, and this tool does not join them.

What if my archives have different passwords?

The password field applies to all sources. Remove the passwords one by one with Remove ZIP Password first, then merge the unlocked copies.

Does merging recompress my files?

The files are extracted and written into a new ZIP with standard Deflate compression. The contents are identical to the originals; only the packed size may differ slightly.

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