BMP vs QOI — Comparison & Free Converter
Fast, instant BMP to QOI conversion. No signup required. Just drop your .bmp file and get .qoi in seconds.
Batch Settings
デジタルの世界では、日々新しい画像フォーマットが登場し、私たちの表現の幅を広げています。BMPは古くから親しまれてきた形式ですが、ファイルサイズが大きくなりがちという特性から、特にウェブやモバイルでの利用においては、より効率的な形式への変換が求められることが少なくありません。そこで注目されているのがQOI（Quite OK Image Format）です。QOIはその名の通り「かなり良い」画像フォーマットとして、高速なエンコード・デコードと優れた圧縮率を両立させ、次世代の画像表現を支える可能性を秘めています。このページでは、お手持ちのBMP画像をQOIへと変換する手順を、日本のユーザーの皆様にとって分かりやすく、そしてスムーズにご案内いたします。ファイルサイズの最適化や表示速度の向上をお考えでしたら、ぜひこの機会にQOIへの変換をお試しください。
- 漫画・アニメのウェブ公開
- ビジネス資料の軽量化
- 同人誌データの効率的な管理
日本では、特に高解像度のイラストや漫画のデジタル配信が増えており、QOIのような新しい高効率フォーマットは、回線速度が限られる環境でも快適な閲覧体験を提供するために重要な役割を果たすでしょう。
About BMP to QOI Conversion
BMP or QOI — which format should you use? The answer depends on your needs. Here's a quick breakdown.
BMP is an uncompressed raster format that preserves every pixel but produces very large files. It has universal platform support. QOI is a widely used file format. It has common platform support.
So when should you convert BMP to QOI? This conversion is ideal when you When you need a QOI file. This conversion helps you convert between formats quickly.
Converting BMP to QOI maintains high quality with CocoConvert's optimised encoder settings.
If you've decided QOI is the right choice, CocoConvert makes the conversion effortless. Upload your .bmp file, pick QOI, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert BMP to QOI
- 1
Choose your BMP file
Upload your .bmp file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to QOI
Select .qoi from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large image files.
- 4
Get your QOI file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert BMP to QOI
Your BMP file is decoded and re-encoded as QOI.
Your BMP 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
BMP
.bmp file
| Extension | .bmp |
| MIME Type | image/bmp |
| Category | Image |
QOI
.qoi file
| Extension | .qoi |
| MIME Type | image/qoi |
| Category | Image |
Should You Convert BMP to QOI?
When to Convert
- ✓When you need a QOI file
Frequently Asked Questions
Should I use BMP or QOI?
It depends on your goal. BMP preserves full quality. QOI preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is QOI higher quality than BMP?
Not necessarily. Converting BMP to QOI maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert BMP to QOI on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for BMP to QOI?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for BMP to QOI?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.