ZIP to 7Z Converter
Convert ZIP archives to 7Z format for better compression. Free, private, no data stored.
Complete the security check to begin
Compress your ZIP into a smaller 7Z archive
7Z uses the LZMA2 algorithm, which achieves significantly better compression ratios than ZIP's DEFLATE. Convert your archives for maximum space savings.
- Better compression - typically 30-70% smaller than ZIP
- Structure preserved - all folders and files are kept intact
- Security validated - zip bomb and path traversal protection
About Converting ZIP to 7Z
ZIP is the universal archive format that bundles and compresses multiple files into one. Every operating system opens ZIP natively, making it the default for sharing file collections. When you need to move away from ZIP, the usual reason is simple: weaker compression than 7z.
Converting your ZIP archive to 7Z solves that. 7Z is a high-ratio archive format from 7-Zip that compresses noticeably tighter than ZIP and supports strong AES-256 encryption. It is ideal for shrinking large file sets. In practice you gain higher compression than zip and strong aes-256 encryption. PrivConvert runs the whole ZIP-to-7Z conversion in server memory and deletes your file the instant the 7Z is ready — nothing is stored, logged or reused.
When this conversion helps
- You need higher compression than ZIP
- You need strong AES-256 encryption
- You need open format
- Sharing a ZIP archive with someone whose software expects 7Z
Tips for best results
- 7Z preserves quality exactly, so the conversion from ZIP will not introduce any new compression artifacts.
- Files up to 250 MB are supported, and you can batch-convert several ZIP files at once; each is processed privately and deleted immediately.
How to Convert ZIP to 7Z Online
You can convert ZIP to 7Z right in your browser in under a minute. What you gain with 7Z: higher compression than ZIP.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from ZIP to 7Z starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
Why choose PrivConvert?
Converting ZIP to 7Z should not mean handing a stranger a permanent copy of your data. PrivConvert processes everything in memory and forgets it instantly.
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your archive cannot be intercepted on the way to the server or back to you.
Convert instantly with no sign-up, no email and no profiling cookies. We never build a profile around you or the files you convert.
Runs in any modern browser on Windows, macOS, Linux, Android and iOS — no install, plugin or desktop software needed.
ZIP vs 7Z - Format Comparison
| Feature | ZIP | 7Z |
|---|---|---|
| File extension | .zip | .7z |
| Full name | ZIP Archive | 7-Zip Archive |
| Introduced | 1989 | — |
| Compression | Lossless | Lossless |
| Encoding | Binary | Binary |
| Open standard | Yes | Yes |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
A converter you do not have to worry about
PrivConvert handles thousands of conversions every day for developers, designers and privacy-conscious people who need a archive converted without handing over a permanent copy.