ZIP to 7Z Converter
Convert ZIP archives to compact 7Z files while preserving folders, filenames, and the complete archive structure. Free and no account required.
Drop your ZIP files here
Up to 50MB per file.
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your ZIP files
Drag and drop or select ZIP files from your device. You can upload multiple files at once.
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Create the new archive
Start the conversion to unpack the ZIP safely and package the original files and folders in a genuine 7Z archive.
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Download 7Z files
Download the completed 7Z archive with its folders and filenames preserved.
Why convert ZIP to 7Z?
ZIP is a widely supported archive that opens natively on common desktop and mobile systems. Converting it to 7Z creates a high-compression archive that can contain multiple files and folders, ready for workflows that use the destination format.
7Z opens with 7-Zip, PeaZip, Keka, The Unarchiver, and compatible archive tools on major operating systems.
Frequently Asked Questions
Why convert ZIP to 7Z?
7Z is useful when you want a compact archive for storage, transfer, or software that specifically accepts the .7z format.
Will my folders and filenames stay intact?
Yes. The converter keeps the archive's folder structure and filenames when it creates the new 7Z file.
Is the result a genuine 7Z archive?
Yes. Crest Convert extracts the ZIP contents and packages them in a real 7Z archive.
Can I convert several ZIP files?
Yes. Add multiple ZIP files and convert them together, then download each completed 7Z archive.
Do I need to install 7-Zip?
No. The conversion runs online, and the finished 7Z file can be downloaded directly.