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format

7z

7z is the 7-Zip archive format with stronger compression than ZIP.

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What is a 7z file?

An open archive format using LZMA2 solid compression, typically 20–40% smaller than ZIP for the same content.

Technical characteristics

Representation
binary
Compression
LZMA2, BZip2, PPMd
Lossy
No
Open specification
Yes
Encryption support
Yes

History and origin

Introduced
1999
Created by
Igor Pavlov

Compatibility

  • Windowsplugin
  • macOSplugin
  • Linuxfull
  • Androidplugin

Advantages of 7z

  • Excellent compression ratio
  • Strong AES-256 encryption
  • Open format

Limitations to know about

  • No built-in OS support
  • Slow to compress at high levels

When to use 7z

  • Large backups
  • Software distribution
  • Long-term storage

Convert 7z files

7z scores

Deterministic scores calculated from the structured facts above. Identical facts always produce identical scores.

Overall score

55/100

  • Openness score

    100
    • the specification is published openly
    • an openly specified format can be implemented without a licence negotiation

    Confidence 49% · evidence coverage 100%

  • Archiving score

    97
    • the specification is public, so a decoder can always be rebuilt
    • the specification is published openly
    • it is actively maintained and current
    • an openly specified format can be implemented without a licence negotiation

    Confidence 62% · evidence coverage 89%

  • Longevity score

    88
    • it is actively maintained and current
    • the specification is published openly
    • the specification is public, so a decoder can always be rebuilt
    • it does not satisfy: mainstream applications ship support for it

    Confidence 62% · evidence coverage 100%

  • AI score

    67
    • open specifications are implemented by the open-source decoders that ML stacks rely on
    • the specification is published openly
    • only a narrow set of applications handles it
    • large lossless payloads cost bandwidth and memory

    Confidence 47% · evidence coverage 100%

  • Printing score

    53
    • lossless data means no compression artefacts appear at print resolution
    • only a narrow set of applications handles it

    Confidence 50% · evidence coverage 50%

  • Photography score

    44
    • lossless data survives repeated open-edit-save cycles without degrading
    • it stores data losslessly, so files stay large
    • some devices ask the person to install something first

    Confidence 52% · evidence coverage 44%

  • Web score

    41
    • the specification is published openly
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 50% · evidence coverage 67%

  • Editing score

    38
    • lossless data survives repeated open-edit-save cycles without degrading
    • only a narrow set of applications handles it

    Confidence 46% · evidence coverage 63%

  • Performance score

    35
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 57% · evidence coverage 100%

  • Streaming score

    33
    • it stores data losslessly, so files stay large
    • large lossless payloads cost bandwidth and memory

    Confidence 59% · evidence coverage 50%

  • Compatibility score

    14
    • an open specification means cloud SDKs can implement it without licensing friction
    • at least one mainstream platform needs extra software
    • only a narrow set of applications handles it

    Confidence 66% · evidence coverage 75%

What 7z is recommended for

Every conclusion below is derived from the structured facts on this page — nothing is written by hand.

  • Long-term archiving100/100

    • Because the specification is public, so a decoder can always be rebuilt.
    • Because lossless storage preserves the original data for future migrations.
    • Because it is a current, actively maintained format.

  • Open standards100/100

    • Because the specification is published openly.

  • Licensing100/100

    • Because an openly specified format can be implemented without a licence negotiation.
    • Because the core patents are old enough to have expired.

  • Future-proofing88/100

    • Because it is actively maintained and current.
    • Because open specifications outlive the companies that create them.
    • Because nothing in the graph supersedes it yet.

  • AI compatibility75/100

    • Because open specifications are implemented by the open-source decoders that ML stacks rely on.
    • Because lossless pixels avoid compression artefacts leaking into training data.

  • Printing suitability71/100

    • Because lossless data means no compression artefacts appear at print resolution.

What 7z is not recommended for

  • Operating system compatibility0/100

    • Because at least one mainstream platform needs extra software.
    • Because platform coverage is thin.

  • Software compatibility0/100

    • Because only a narrow set of applications handles it.
    • Because documented application support is minimal.

  • Compression efficiency23/100

    • Because it stores data losslessly, so files stay large.
    • Because its codec generation predates modern entropy coding and block partitioning.

  • Everyday consumer usage25/100

    • Because some devices ask the person to install something first.
    • Because it does not satisfy: small files are easy to email, message and upload.

  • Web suitability33/100

    • Because lossless payloads cost more bandwidth than the web usually justifies.

Related to 7z

File extensions

Supported by

Compression used

Compared with

Alternatives

Data quality

Every claim on this page is classified as a verified fact, a derived fact or an assumption.

Overall confidence
83%
Verification status
verified
Last reviewed
2026-08-03
Verified facts
2

2 classified claims backed by 1 source.

  • Convert Always editorial review — Convert Always

Sources and review status

Review status: verified · confidence 80%

Last reviewed 2026-08-03 (revision 1).

  • Convert Always editorial review — Convert Always