PNG to QOI — Format Comparison & Online Converter
Fast, instant PNG to QOI conversion. No signup required. Just drop your .png file and get .qoi in seconds.
Batch Settings
お手持ちのPNG画像を、より高効率なQOI形式へ変換しませんか？QOI（Quite OK Image）は、その名の通り「かなり良い」画像フォーマットとして注目を集めています。特に、ウェブサイトの読み込み速度向上や、開発現場での画像処理の高速化に貢献します。PNGが持つ豊かな表現力はそのままに、ファイルサイズを抑え、デコード速度を飛躍的に向上させることが可能です。漫画やイラスト、ビジネス資料など、様々な用途で画像を用いる機会の多い日本において、QOI形式への変換は、作業効率の向上とユーザー体験の最適化に繋がるでしょう。当サービスでは、複雑な設定なしに、どなたでも簡単に高品質な変換を行っていただけます。ぜひ一度、その軽快さをお試しください。
- ウェブコミック・漫画の高速表示
- ビジネス資料・プレゼンテーションの軽量化
- ゲーム開発におけるテクスチャ処理
QOIはアルファチャンネルを効率的に扱えるため、透過表現が重要なアニメーションやゲーム素材において、PNGからの移行先として特に有効です。
About PNG to QOI Conversion
PNG (introduced 1996) and QOI are both image formats, but they differ in important ways. PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots. QOI is a widely used file format.
When you convert PNG to QOI, the goal is to convert between formats quickly. Converting PNG to QOI maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your PNG file is decoded and re-encoded as QOI. The conversion involves 4 steps: (1) your png file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in qoi format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a QOI file. For the opposite direction, CocoConvert also supports QOI to PNG conversion.
How to Convert PNG to QOI
- 1
Upload .png file
Select your PNG file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .qoi
Set QOI as the output format. The converter uses optimal settings based on the PNG→QOI conversion profile.
- 3
Convert
The server-side engine decodes your PNG file and re-encodes it as QOI. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .qoi file. Multiple output files can be downloaded together.
What Happens When You Convert PNG to QOI
Your PNG file is decoded and re-encoded as QOI.
Your PNG file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in QOI format
The converted file is ready for download
Format Comparison
PNG
.png file
| Extension | .png |
| MIME Type | image/png |
| Category | Image |
QOI
.qoi file
| Extension | .qoi |
| MIME Type | image/qoi |
| Category | Image |
Should You Convert PNG to QOI?
When to Convert
- ✓When you need a QOI file
Frequently Asked Questions
What is the difference between PNG and QOI?
PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots. QOI is a widely used file format.
Does PNG to QOI conversion affect quality?
Converting PNG to QOI maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, PNG or QOI?
PNG uses lossless compression. QOI is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does PNG to QOI conversion take?
Most conversions finish in seconds. Larger files or complex image content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is PNG or QOI better for long-term storage?
PNG is better for archival since it's lossless.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.