ZIP to 7Z Converter

Drop ZIP files here or browse One or many - locked ZIPs and split parts (.z01, .zip.001) work too ZIP RAR TAR.GZ ISOCAB+more

Try a sample

Batch + split parts Folders and dates kept Nothing is uploaded

Smaller archives

LZMA2 often makes documents, code and databases 10-40% smaller than the ZIP.

Hidden file names

With a password the 7Z is AES-256 encrypted and nobody can even see the names inside.

Your choice of speed

Store, Fast, Normal or Maximum - and the measured size before and after for every file.

A whole batch

Drop many ZIPs and get one 7Z per ZIP, each with the same name.

Nothing shuffled

Folders, file names and modified dates come across exactly, empty folders included.

Private and safe

Nothing is uploaded, unsafe paths are cleaned and disguised programs are flagged.

ZIP vs 7Z at a glance

ZIP opens everywhere, 7Z saves space.

	ZIP	7Z
Compression	Deflate	LZMA2 - 10-40% smaller
Password	AES-256 or ZipCrypto	AES-256, names hidden
Opens without extra apps	Everywhere	Windows 11 (2023+) only
Open one file without unpacking all	Yes	Slower in solid archives
Best for	Sharing with anyone	Backups, uploads, long-term storage

Tip: keep the 7Z for storage and send people a ZIP - 7Z to ZIP converts it back in seconds.

What shrinks and what does not

Text-based files shrink the most.

Documents, spreadsheets, source code, logs, CSV exports and database dumps often end up a third smaller as 7Z. Programs and fonts land somewhere in between.

JPG photos, MP4 videos, MP3 music and Office files such as DOCX are already compressed, so their size hardly changes. For those, Compress JPG or Compress PDF help much more.

Frequently Asked Questions

Drop the ZIP file on this page and press Convert to 7Z. Every file is unpacked in your browser and packed again with 7-Zip's LZMA2 compression, keeping folders, names and dates.

The 7Z downloads as soon as it is ready.

For text, documents, code, databases and program files 7Z is usually 10-40% smaller, sometimes much more. Photos, videos and music are already compressed, so they barely shrink in any format.

The tool shows the measured size before and after, so you see the saving right away. For photos, Compress JPG and Compress PNG save far more.

Normal is the best trade-off for most files. Maximum squeezes out a few more percent but takes longer, Fast is quick for big batches, and Store only bundles files without compressing them.

Yes. Type a password under Password for the new archive and the 7Z is encrypted with AES-256. The file names are hidden too, so nobody can even see what is inside without the password.

Need a strong one? The Password Generator makes one in a click.

Yes. ZIP files locked with AES-256, AES-128 or ZipCrypto convert after you type their password.

Add a password for the 7Z as well if it should stay locked.

On Windows use the free 7-Zip, or Explorer on Windows 11 since its late-2023 update. On a Mac use Keka or The Unarchiver.

To look inside in a browser use the 7Z File Viewer, and 7Z to ZIP turns it back into a ZIP any time.

The 7Z is built by 7-Zip running in your browser, which can pack up to about 900 MB of unpacked files per archive.

Bigger ZIP files need 7-Zip on a computer - the tool warns you before you start. Still having trouble? Please contact us and we'll be happy to help!

No. The ZIP is unpacked and the 7Z is built by your browser with WebAssembly, so nothing leaves your device - not the files and not the password.

Converted!

How to convert ZIP to 7Z

Why use this ZIP to 7Z converter