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QOI File Format

Quite OK Image category

QOI(Quite OK Image Format)は高速でシンプルな可逆圧縮形式です。実装が数百行と軽く、エンコードもデコードも PNG より圧倒的に速いのが特徴です。

Typical use: とにかく速く可逆で保存したいときに QOI を使います。

About the QOI format

QOI(Quite OK Image Format)は高速でシンプルな可逆形式です。実装が数百行と軽く、エンコードもデコードも PNG より圧倒的に速いのが特徴です。

圧縮率は PNG にやや劣ります。速さを優先する用途に向きます。

Strengths

  • ✓ とにかく速い
  • ✓ 実装が極めて簡単
  • ✓ 可逆で画質劣化なし

Limitations

  • ✗ PNG よりは大きい
  • ✗ 対応ソフトが少ない
Compression
Lossless (RLE/delta)
Transparency
Supported
Animation
Not supported
Metadata
None
Best for
Hobby engines, lossless simplicity

Convert QOI to…

53 direct directions plus 15 workflows, sorted A–Z; 🔥 marks popular targets.

Convert other files to QOI…

Frequently asked questions

What is a QOI file?

QOI (Quite OK Image) is a 2022 lossless format with a ~200-line spec — PNG-class simplicity that compresses similarly fast.

How do I convert QOI files online?

Pick a target format from the "Convert QOI 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 QOI 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 QOI convert to?

This page lists all 68 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.