BMP Won't Open? Convert to PNG Instantly
Fast, instant BMP to PNG conversion. No signup required. Just drop your .bmp file and get .png in seconds.
Batch Settings
デジタルの世界で画像を扱う際、ファイル形式の選択は仕上がりの印象を大きく左右します。特に、歴史あるBMP形式から、現代のウェブやビジネスシーンで主流のPNG形式への変換は、単なるデータ形式の変更以上の意味を持ちます。BMPはかつてWindows環境で広く使われ、そのシンプルさゆえに多くの場面で活躍しました。しかし、ファイルサイズが大きく、ウェブでの表示速度や透過性の面で課題がありました。一方、PNGは可逆圧縮による高画質保持、透過背景のサポート、そしてウェブフレンドリーな特性から、現在ではアニメーション制作、ビジネス文書、あるいは個人のブログまで、幅広い用途でその真価を発揮しています。この変換を通じて、皆さんの大切な画像がより多くの場面で、より美しく、より効率的に活用されるお手伝いができれば幸いです。
- 漫画・アニメの背景透過素材作成
- ビジネス資料のロゴ・図版最適化
- 縦書きウェブサイトの画像軽量化
日本のデザイン、特に漫画やアニメ、あるいは伝統的な和風デザインでは、線の美しさや色の鮮やかさが重視されます。BMPからPNGへの変換は、透過性を持たせることでキャラクターと背景の合成を容易にし、また、ファイルサイズの軽量化はウェブコミックやデジタル出版の表示速度向上に直結するため、非常に有効な手段と言えます。
About BMP to PNG Conversion
Dealing with a BMP file that won't open on your device? You're not alone — BMP compatibility issues are one of the most common reasons people search for a file converter. BMP is an uncompressed raster format that preserves every pixel but produces very large files.
The fix is simple: convert your BMP to PNG. PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Full Name: BMP uses Bitmap Image, while PNG uses Portable Network Graphics. Compression: BMP uses None (uncompressed), while PNG uses Lossless. Transparency: BMP uses No, while PNG uses Yes. Converting BMP to PNG maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your BMP 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 a file that works in web browsers, or when you You need maximum device and software compatibility.
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 BMP to PNG
- 1
Add your BMP file
Drag and drop your .bmp file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick PNG output
Select .png 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 .png file. For batch jobs, download all at once as a zip.
What Happens When You Convert BMP to PNG
Your BMP image is decoded into raw pixel data, then re-encoded as PNG. No quality loss — pixel data is preserved exactly.
Your BMP file is decoded — the compressed/stored pixel data is expanded into raw RGB pixels
Pixels are re-encoded using Portable Network Graphics's lossless compression
Metadata (EXIF, ICC profiles) is transferred where PNG supports it
The PNG file is saved and ready for download
BMP vs PNG — Detailed Comparison
| Feature | .BMP | .PNG |
|---|---|---|
| Full Name | Bitmap Image | Portable Network Graphics |
| Compression | None (uncompressed) | Lossless |
| Transparency | No | Yes |
| Animation | No | No |
| Color Depth | up to 32 bits/channel | 8 or 16 bits/channel (up to 48-bit color) |
| HDR Support | No | No |
| Typical File Size | 10–50 MB per photo (uncompressed) | 5–20 MB per photo, <1 MB for graphics |
| Platform Support | Universal | Universal |
| Browser Support | Limited | Universal |
| Year Created | 1986 | 1996 |
| Open Standard | No | Yes |
Should You Convert BMP to PNG?
When to Convert
- ✓You need a file that works in web browsers
- ✓You need maximum device and software compatibility
Frequently Asked Questions
Why won't my BMP file open?
BMP files may not open if your device lacks the right codec or application. Converting to PNG — a more widely supported format — usually resolves this. PNG uses lossless compression and supports transparency, making it perfect for graphics, logos, and screenshots.
Is it safe to convert BMP to PNG 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 BMP to PNG?
Converting BMP to PNG maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my BMP 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 BMP to PNG 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.