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What is a ZIP file?

ZIP bundles many files into one losslessly compressed archive and has been the default on every major operating system for decades. Each file is compressed independently, so a single corrupt entry does not destroy the whole archive, and individual files can be extracted without unpacking everything.

At a glance

Full name
ZIP archive
Extensions
.zip
Type
Archive
Introduced
1989
Created by
Phil Katz, PKWARE
Compression
Lossless
MIME type
application/zip

Strengths

  • Built into Windows, macOS and Linux with no extra software
  • Individual files can be extracted without unpacking the archive
  • Optional password protection

Limitations

  • Compresses less than 7z or modern alternatives
  • The legacy ZipCrypto encryption is weak; AES support varies by tool
  • Filename encoding differences cause mangled names across platforms

When to use ZIP

Use it when

Packaging files for someone else, where guaranteed compatibility matters most.

Avoid it when

You need maximum compression or strong encryption.

Convert ZIP files

Every tool below runs in your browser unless it is labelled otherwise, so the file stays on your device.

ZIP compared