7Z is an open archive format with support for LZMA/LZMA2 compression, offering some of the best compression ratios. It supports encryption, solid compression, and multiple files.

7Z vs ZIP — which is better?

7Z typically achieves 30-70% better compression than ZIP. ZIP has universal compatibility, while 7Z is better for maximum compression.

How much compression can I expect?

Text and document files can compress by 60-90%. Mixed content archives typically see 40-60% reduction.

Is this 7Z compressor free?

Yes, completely free with no limits. Compress as many files as you need.

Compress 7Z

Compress files to 7Z format with high compression ratio.

or drop files here

Maximum file size: 500MB total

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Learn more about this tool

About 7Z Compression

7Z is a modern archive format developed by 7-Zip, supporting LZMA and LZMA2 compression algorithms for excellent compression ratios. It supports AES-256 encryption, multi-volume archives, and solid compression. Our tool uses WebAssembly for efficient browser-based compression. Whether you are optimizing assets for a US-hosted site on AWS, Cloudflare, or Vercel, trimming email attachments for Gmail and Outlook, or submitting documents to federal portals, this tool keeps your files lean and your workflow fast — all without uploading anything to a server.