ICO Won't Open? Convert to BMP Instantly
Fast, instant ICO to BMP conversion. No signup required. Just drop your .ico file and get .bmp in seconds.
Batch Settings
Transparency will be lost
ICO supports transparency, but BMP does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead.
お持ちのICOファイルを、様々な用途で使いやすいBMP形式へ変換しませんか？アイコンやちょっとした画像に利用されるICO形式は、手軽さが魅力の一方で、DTPソフトやビジネス文書への埋め込み、あるいは高解像度での印刷といった場面では、その特性上、扱いにくいと感じることも少なくありません。特に、鮮明な表示が求められる場面では、ビットマップ形式の持つ色の再現性や汎用性が大きな強みとなります。当社の変換ツールは、お客様の大切な画像を、品質を損なうことなくスムーズにBMP形式へと変換いたします。複雑な設定は一切不要。直感的な操作で、どなたでも簡単にご利用いただけます。あなたのクリエイティブな作業やビジネスシーンを、より快適にサポートするための第一歩として、ぜひご活用ください。
- 漫画・アニメ関連の同人誌制作
- ビジネス資料へのロゴ挿入
- 縦書き文書における画像配置
日本のDTP環境やビジネス文書では、BMP形式の方がICO形式よりもフォントやレイアウトとの親和性が高く、特に高解像度での出力時にその差が顕著に現れることがあります。
About ICO to BMP Conversion
Dealing with a ICO file that won't open on your device? You're not alone — ICO compatibility issues are one of the most common reasons people search for a file converter. ICO is the icon format used for website favicons and Windows application icons.
The fix is simple: convert your ICO to BMP. BMP is an uncompressed raster format that preserves every pixel but produces very large files. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Full Name: ICO uses Icon File, while BMP uses Bitmap Image. Compression: ICO uses Lossless, while BMP uses None (uncompressed). Transparency: ICO uses Yes, while BMP uses No. ICO supports transparency, but BMP does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead.
CocoConvert processes your ICO file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you You need maximum device and software compatibility. Common misconception: ""My file's transparent background will carry over to BMP"" — in reality, bmp doesn't support transparency. transparent areas become solid (usually white). save as png or webp if you need transparency.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert ICO to BMP
- 1
Add your ICO file
Drag and drop your .ico file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick BMP output
Select .bmp as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The image engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .bmp file. For batch jobs, download all at once as a zip.
What Happens When You Convert ICO to BMP
Your ICO image is decoded into raw pixel data, then re-encoded as BMP. No quality loss — pixel data is preserved exactly.
Your ICO file is decoded — the compressed/stored pixel data is expanded into raw RGBA (with alpha channel) pixels
Transparency is resolved: transparent pixels are composited onto a white background
Pixels are re-encoded using no compression (raw pixel storage)
Metadata (EXIF, ICC profiles) is transferred where BMP supports it
The BMP file is saved and ready for download
ICO vs BMP — Detailed Comparison
| Feature | .ICO | .BMP |
|---|---|---|
| Full Name | Icon File | Bitmap Image |
| Compression | Lossless | None (uncompressed) |
| Transparency | Yes | No |
| Animation | No | No |
| Color Depth | 32-bit (with alpha) | up to 32 bits/channel |
| HDR Support | No | No |
| Typical File Size | <100 KB | 10–50 MB per photo (uncompressed) |
| Platform Support | Universal | Universal |
| Browser Support | Universal | Limited |
| Year Created | 1985 | 1986 |
| Open Standard | No | No |
Should You Convert ICO to BMP?
When to Convert
- ✓You need maximum device and software compatibility
When NOT to Convert
- ✗You need to preserve transparent areas — BMP doesn't support transparency
Consider alternatives:
Common Mistakes When Converting ICO to BMP
"My file's transparent background will carry over to BMP"
BMP doesn't support transparency. Transparent areas become solid (usually white). Save as PNG or WebP if you need transparency.
"BMP will be smaller than my ICO file"
BMP uses no compression, so the output file is often larger than a lossy ICO. If you need a small file, BMP may not be the right choice.
Frequently Asked Questions
Why won't my ICO file open?
ICO files may not open if your device lacks the right codec or application. Converting to BMP — a more widely supported format — usually resolves this. BMP is an uncompressed raster format that preserves every pixel but produces very large files.
Is it safe to convert ICO to BMP online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting ICO to BMP?
ICO supports transparency, but BMP does not. Transparent areas will be filled with a solid color (typically white). If you need transparency, consider converting to PNG or WebP instead. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my ICO file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert ICO to BMP on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.