Image converter
Convert BMP to ICO
Private format conversion with optional resizing, compression, and adjustments. Your files never leave this browser.
Drag & drop images here, or click to browse
PNG, JPG, WEBP, HEIC, AVIF, BMP, GIF, TIFF — up to 25MB each (max 20 files)
About converting BMP to ICO
Convert BMP images to ICO for Windows application icons and classic desktop shortcuts. The bitmap is squared and bundled at standard icon sizes for taskbar, start menu, and desktop use.
BMP is one of the oldest Windows image formats, dating to the early days of Microsoft Windows. It stores pixels with essentially no compression. ICO is the native Windows icon format, used for taskbar shortcuts, application executables, and — most commonly today — browser favicons.
Both formats share the same compression philosophy, so the conversion is mainly about compatibility and file size rather than a change in image quality behaviour.
When to use BMP vs ICO
Choose ICO when website favicons, PWA icons, Windows desktop shortcuts, browser tabs, and application branding assets. Keep BMP when legacy Windows applications, pixel-art editing, machine-vision pipelines, raw texture data, and software that predates modern formats.
On strengths: BMP brings zero decoding complexity, bit-exact fidelity, and acceptance by legacy industrial, scientific, and manufacturing software that refuses compressed formats. ICO brings required format for Windows shortcuts and classic favicons, multi-resolution packing, and transparent backgrounds on every supported size.
The trade-off: Extremely large files — a single screen-sized BMP can be several megabytes — plus weak transparency support and poor handling of photographic content. Square dimensions only, limited color handling compared to PNG, and no purpose outside icon display — it is not a general image format.
How to convert BMP to ICO
The converter runs entirely in this browser tab — there is no upload, no account, and no file-size harvesting. Follow these steps:
- Drop your BMP files onto the converter above, or click the drop zone to browse. Up to 20 files can queue at once, each up to 25 MB.
- The output defaults to ICO. Adjust the quality slider if the format is lossy, or resize/crop first if you also want to change dimensions.
- Press Convert. Decoding and encoding happen in browser memory using Canvas — your pixels never leave the device.
- Preview the result, then download it individually or grab the whole batch as a ZIP.
About BMP — Bitmap picture
BMP is one of the oldest Windows image formats, dating to the early days of Microsoft Windows. It stores pixels with essentially no compression.
Typical uses: Legacy Windows applications, pixel-art editing, machine-vision pipelines, raw texture data, and software that predates modern formats.
About ICO — Icon file
ICO is the native Windows icon format, used for taskbar shortcuts, application executables, and — most commonly today — browser favicons.
Typical uses: Website favicons, PWA icons, Windows desktop shortcuts, browser tabs, and application branding assets.
Tips for a clean BMP → ICO conversion
- Work from the highest-quality BMP source you have. Converting from an already-compressed copy stacks compression artifacts on top of each other.
- You can re-export ICO as many times as needed without losing data — ideal if the file will be edited repeatedly.
- Batch similar images together — files with comparable dimensions convert in the same pass, which keeps the workflow fast.
- Keep the original file. Even lossless conversions can subtly change color profiles, and the source is your safety net.
Frequently asked questions
Is this BMP to ICO converter free?+
Yes. All image conversions are completely free with no sign-up, no watermarks, and unlimited usage.
Are my images uploaded to a server?+
No. All conversion happens locally in your browser via the HTML5 Canvas API. Your files are never uploaded or stored anywhere.
Will converting BMP to ICO reduce quality?+
ICO is a lossless format, so the converted file stores every decoded pixel exactly — quality does not degrade during conversion, and you can re-save it repeatedly without generational loss.
Can I convert multiple BMP files at once?+
Yes — drop up to 20 files into the converter and they will all be processed in a single batch. Each file can be up to 25 MB. The batch downloads as a ZIP, or you can save results individually from the preview.
Does this converter work on phones and tablets?+
Yes. The converter is a responsive web app that runs in any modern mobile browser — iOS Safari, Chrome for Android, and others. Files are processed on-device, so mobile uploads are not sent anywhere and the connection speed does not affect conversion time.