Upload Your ZIP
Select a ZIP archive from your device or drag and drop it into the upload area.
Fast, Secure & Easy
ZIP to 7Z Converter
Convert ZIP archives into modern 7Z files with secure extraction and strong compression. No technical skills required.
Secure path validation
Strong 7Z compression
Automatic daily cleanup
How to Convert ZIP to 7Z
Turn your ZIP archive into a 7Z file in three simple steps.
Start Conversion
Click “Convert to 7Z.” The server safely extracts the ZIP and creates a new 7Z archive.
Download 7Z
When conversion finishes, download your new .7z archive with one click.
Why Use Our ZIP to 7Z Converter?
A secure, dependable way to rebuild ZIP contents in the efficient 7Z format.
Efficient Archive Format
7Z supports strong compression and works with archive managers on Windows, Linux, and macOS.
Security Checks
Unsafe paths, symbolic links, excessive file counts, and oversized extracted archives are rejected.
Strong Compression
Compression level 7 and multithreading provide a practical balance of archive size and speed.
What Is a ZIP File?
ZIP is a widely supported archive format used to package files and folders into one downloadable file. It supports lossless compression and works natively with Windows, macOS, Linux, mobile devices, browsers, and many file-management applications.
Why convert ZIP to 7Z?
7Z is a modern archive format known for strong compression and large-file support. Converting ZIP to 7Z can improve storage efficiency for documents, source code, logs, and repeated data. Already compressed media may not become smaller.
Professional 7Z output
This converter validates each ZIP entry, safely extracts the archive into an isolated temporary folder, and rebuilds the contents with 7-Zip using multithreading and compression level 7.
Frequently Asked Questions
Helpful answers about converting ZIP archives to 7Z.
How do I convert a ZIP file to 7Z?
Upload your .zip archive, click “Convert to 7Z,” wait for processing to finish, and then download the new 7Z file.
What compression software does the tool use?
The converter uses PHP ZipArchive for safe reading and the server’s 7-Zip command to create the final .7z archive.
Is this ZIP to 7Z converter free?
Yes. The tool can be used without registration or special conversion software.
Will the 7Z archive always be smaller?
No. Documents and repeated data often compress well, while images, videos, MP3 files, and other pre-compressed data may show little reduction.
What is the maximum upload size?
The tool accepts ZIP archives up to 100 MB, 5,000 entries, and 500 MB after extraction. Your PHP upload limits must also allow 100 MB.
Are uploaded archives kept on the server?
The tool removes temporary extracted files immediately and automatically deletes uploaded and converted files older than 24 hours.
Why is my ZIP file not converting?
The archive may be damaged, encrypted, unsafe, too large after extraction, or your server may not have PHP ZipArchive, PHP exec(), and 7-Zip available.