ZIP – ZIP Archive
ZIP is the most common archive format. It bundles files and folders into one compressed file that every operating system can open.
More ZIP conversionsDrop your ZIP files here
or click to choose ZIP files · up to 95MB each
How to convert ZIP to 7Z
- Choose your files. Click Select File or drag your ZIP files into the upload box. You can add many at once.
- Pick the settings. 7Z is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
Why convert ZIP to 7Z?
7Z usually compresses better than ZIP, so converting a ZIP to 7Z can make backups and large downloads smaller.
When to keep the ZIP
Keep the ZIP for sharing with people who do not have 7-Zip or a similar tool, since ZIP opens everywhere.
Tips for the best result
- All files and folders are kept with the same structure.
- Text, documents and code shrink the most; photos and videos are already compressed and shrink very little.
- Archives that unpack to a very large size are refused, for safety.
Common problems and fixes
- The 7Z is not smaller.
- If the ZIP contains JPGs, MP4s or other compressed files, there is little left to save.
- The ZIP will not convert.
- Password-protected ZIPs cannot be opened. Unpack them with the password first.
7Z – 7-Zip Archive
7Z is the open archive format of 7-Zip. Its LZMA compression usually gives smaller files than ZIP.
More 7Z conversionsConverting ZIP to 7Z
- GZ, BZ2 and XZ hold a single file. Unpacked size is limited to protect the server.
Frequently asked questions
Is 7Z better than ZIP?
7Z often makes smaller files; ZIP is supported everywhere without extra software.
What opens 7Z files?
7-Zip on Windows, Keka or The Unarchiver on Mac, and many file manager apps on phones.
How do I convert ZIP to 7Z?
Click Select File or drop your ZIP file onto the upload box. The converted 7Z appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.