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7Z File Format

7-Zip Archive category

7Z is the format of 7-Zip: the best compression ratios of any mainstream archiver, with AES-256 encryption, but Windows Explorer cannot open it without extra software.

Typical use: 7Z is ideal for big archives you store or share with power users; convert to ZIP when the recipient just needs to double-click.

About the 7Z format

7Z is the native format of Igor Pavlov's 7-Zip (1999), built around LZMA/LZMA2 compression — for years the ratio king against ZIP and RAR — with AES-256 encryption, solid archiving (similar files compress as one stream) and open, unpatented specifications. A 7Z of the same photos or code is routinely 20–40% smaller than its ZIP.

The trade-off is platform defaults: Windows Explorer and macOS Archive Utility do not open 7Z without third-party tools (7-Zip, PeaZip, Keka). It is the format for maximizing compression on your own terms, and for encrypted archives done properly (header encryption included).

Strengths

  • ✓ Top-tier compression ratio (LZMA2)
  • ✓ Real AES-256 encryption, optional header encryption
  • ✓ Open format, free tooling everywhere

Limitations

  • ✗ No native OS support — recipients need tools
  • ✗ Solid mode makes single-file extraction costly
Compression
LZMA / LZMA2
Encryption
AES-256 native
Bundling
Multi-file, solid mode
Best for
Maximum compression, secure archives

Convert 7Z to…

11 direct directions, sorted A–Z; 🔥 marks popular targets.

7Z to APK 7Z to JAR 7Z to TAR Hot 7Z to TAR.BZ2 7Z to TAR.GZ Hot 7Z to TAR.XZ 7Z to TBZ2 7Z to TGZ 7Z to TXZ 7Z to WIM 7Z to ZIP Hot

Convert other files to 7Z…

APK to 7Z ARJ to 7Z BZ2 to 7Z CAB to 7Z CHM to 7Z CPIO to 7Z DEB to 7Z DMG to 7Z GZ to 7Z ISO to 7Z Hot JAR to 7Z LZ4 to 7Z LZH to 7Z LZO to 7Z MSI to 7Z RAR to 7Z Hot RPM to 7Z TAR to 7Z Hot TAR.GZ to 7Z Hot TGZ to 7Z UUE to 7Z WIM to 7Z XXE to 7Z XZ to 7Z Z to 7Z ZIP to 7Z Hot ZST to 7Z

Cross-engine workflows

3DS to 7Z 3G2 to 7Z 3GP to 7Z 3MF to 7Z AAC to 7Z AC3 to 7Z AIF to 7Z AIFF to 7Z ALAC to 7Z AMB to 7Z AMR to 7Z APE to 7Z ASF to 7Z AU to 7Z AVI to 7Z AVIF to 7Z AVR to 7Z BMP to 7Z BVH to 7Z CAF to 7Z CIN to 7Z CSV to 7Z CUR to 7Z CVS to 7Z CVU to 7Z DAE to 7Z DCX to 7Z DDS to 7Z DivX to 7Z DSS to 7Z DTS to 7Z DV to 7Z E-AC3 to 7Z F32 to 7Z F4A to 7Z F4B to 7Z F4V to 7Z F64 to 7Z FAP to 7Z FARBFELD to 7Z FBX to 7Z FITS to 7Z FLAC to 7Z FLV to 7Z FSSD to 7Z GeoTIFF to 7Z GIF to 7Z GLB to 7Z glTF to 7Z GRAY to 7Z GRAYA to 7Z GSM to 7Z GSRT to 7Z H.264 to 7Z HCOM to 7Z HDR to 7Z HEIC to 7Z HEIF to 7Z HTK to 7Z ICO to 7Z IRCAM to 7Z J2C to 7Z J2K to 7Z JFIF to 7Z JP2 to 7Z JPE to 7Z JPEG to 7Z JPG to 7Z JPT to 7Z JXL to 7Z LWO to 7Z M1V to 7Z M2TS to 7Z M2V to 7Z M4A to 7Z M4B to 7Z M4R to 7Z M4V to 7Z MAUD to 7Z MD2 to 7Z MJPEG to 7Z MKV to 7Z MOD to 7Z MOV to 7Z MP2 to 7Z MP3 to 7Z MP4 to 7Z MPEG to 7Z MPEG1 to 7Z MPEG2 to 7Z MPEG4 to 7Z MPG to 7Z MTS to 7Z MXF to 7Z OBJ to 7Z OGA to 7Z OGG to 7Z OGV to 7Z OMA to 7Z OPUS to 7Z OTB to 7Z PAF to 7Z PALM to 7Z PBM to 7Z PCL to 7Z PCX to 7Z PDF to 7Z PFM to 7Z PGM to 7Z PLY to 7Z PNG to 7Z PNG24 to 7Z PNG8 to 7Z PNM to 7Z PPM to 7Z PSB to 7Z PSD to 7Z PVF to 7Z QCP to 7Z QOI to 7Z RAS to 7Z RAW to 7Z RM to 7Z RMVB to 7Z S16 to 7Z S24 to 7Z S32 to 7Z S3M to 7Z SD2 to 7Z SHN to 7Z SIXEL to 7Z SMP to 7Z SNDR to 7Z SNDT to 7Z SPX to 7Z STL to 7Z SVG to 7Z SVGZ to 7Z TAK to 7Z TGA to 7Z TIF to 7Z TIFF to 7Z TS to 7Z TTA to 7Z TXW to 7Z U8 to 7Z UYVY to 7Z VICAR to 7Z VMS to 7Z VOB to 7Z VOC to 7Z VQF to 7Z VRML to 7Z W64 to 7Z WAV to 7Z WAVPCM to 7Z WEBM to 7Z WebP to 7Z WMA to 7Z WMV to 7Z WTV to 7Z WV to 7Z WVE to 7Z XBM to 7Z XI to 7Z XM to 7Z XPM to 7Z XV to 7Z Xvid to 7Z Y4M to 7Z

Frequently asked questions

What is a 7Z file?

7Z is the format of 7-Zip: the best compression ratios of any mainstream archiver, with AES-256 encryption, but Windows Explorer cannot open it without extra software.

How do I convert 7Z files online?

Pick a target format from the "Convert 7Z to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert 7Z files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can 7Z convert to?

This page lists all 11 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.