Convert BMP to QOI Online Free
Convert BMP images to QOI format in your browser. QOI is a modern lossless format with much faster encoding and decoding than BMP or PNG.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts BMP to QOI instantly in your browser using the Canvas API. No file upload needed — your image stays on your device. Drop your BMP and download the result in seconds. Free and completely private.
Convert BMP to QOI
Drop your BMP file here to convert it instantly
Drag & drop your .bmp file here, or click to browse
Convert to QOI instantly
BMP vs QOI: Format Comparison
Key differences between the two formats
| Feature | BMP | QOI |
|---|---|---|
| Compression | None (uncompressed raw pixels) | Lossless run-length encoding |
| File size | Very large — no compression | Smaller — light compression |
| Encoding speed | Fast — no processing needed | Very fast — minimal overhead |
| Decoding speed | Fast — direct memory map | Very fast — trivial algorithm |
| Transparency | Limited (rare 32-bit BMP) | Full RGBA alpha support |
| Portability | Windows-native, limited elsewhere | Cross-platform, open spec |
| Best for | Windows system bitmaps | Game assets and real-time rendering |
When to Convert
Common scenarios where this conversion is useful
Shrink uncompressed Windows screenshots
BMP screenshots from Windows tools are uncompressed and can be enormous. Converting to QOI compresses the image using a lossless algorithm, reducing file size while preserving every pixel.
Game asset modernization
Legacy games stored textures as BMP files. Converting to QOI is a drop-in upgrade — QOI files are smaller than BMP and decode at the same speed, making it an easy modernization step.
Cross-platform image sharing
BMP is a Windows-native format with poor support on Linux and macOS. QOI is an open format with libraries available on every platform, making it a better choice for cross-platform pipelines.
Real-time rendering pipeline
Applications that load BMP textures at runtime can switch to QOI for smaller file size with equivalent decode speed. QOI's simple algorithm means the CPU overhead is negligible.
How to Convert BMP to QOI
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1
Select your BMP file
Drag and drop your BMP file onto the converter, or click browse to choose from your files.
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2
Instant conversion
The browser converts your BMP to QOI locally using the Canvas API. No upload needed and no data leaves your device.
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3
Download the QOI
Save your converted QOI file. Ready to use immediately in your application.
Frequently Asked Questions
QOI compresses image data using a simple lossless algorithm, making files significantly smaller than uncompressed BMP. QOI also has better cross-platform support and is better suited for game development pipelines.
No. QOI is lossless. Every pixel from your BMP will be stored exactly in the QOI file. The conversion is bit-perfect — no quality loss at all.
QOI files are typically 30-70% smaller than equivalent BMP files for photographic content. For images with large uniform areas (like screenshots), QOI can be 50-80% smaller.
No. Conversion runs entirely in your browser using the Canvas API. Your file never leaves your device.
QOI (Quite OK Image) is a fast lossless image format introduced in 2021. Its simple encoding algorithm makes it faster to encode and decode than PNG while still being fully lossless.
Yes, QOI supports RGBA (with full alpha transparency). If your BMP has an alpha channel (32-bit BMP), transparency will be preserved in the QOI output.
GIMP, ImageMagick, and many game engines support QOI. Libraries are available in Python, C, Rust, Go, Java, and most major languages. Standard OS image viewers do not support QOI natively.
No server limit — conversion is local. The practical limit is your browser's available memory. Standard desktop browsers can handle BMP files up to several hundred MB without issue.
Yes. 32-bit BMP includes an alpha channel. The Canvas API reads the alpha data and the QOI output will be RGBA, preserving the transparency from your BMP.
Chrome, Firefox, Safari, and Edge — any modern browser with Canvas API support. BMP reading and QOI writing via canvas are supported on all current browser versions.
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