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
Vous travaillez avec des images bitmap (BMP) et souhaitez les convertir au format PNG pour une meilleure compatibilité, une taille de fichier réduite ou une gestion optimisée de la transparence ? Que ce soit pour des projets professionnels, des publications académiques ou des usages personnels, la conversion de BMP à PNG est une étape fréquente. Le format BMP, bien que fidèle à l'original, peut s'avérer lourd et peu pratique pour le web ou le partage. Le PNG, en revanche, offre une compression sans perte et supporte la transparence alpha, le rendant idéal pour une multitude d'applications. Notre outil vous accompagne dans cette transition, assurant une conversion rapide et de qualité, préservant l'intégrité visuelle de vos images tout en les rendant plus polyvalentes. Simplifiez vos flux de travail et optimisez vos fichiers graphiques sans effort.
- Archivage de documents administratifs numérisés (France)
- Illustrations pour publications scientifiques (Suisse)
- Optimisation d'éléments graphiques pour sites web (Québec)
Dans les administrations publiques et le secteur académique francophone, le PNG est souvent privilégié pour la diffusion en ligne de graphiques et schémas, offrant un bon équilibre entre qualité d'image et taille de fichier, ce qui est crucial pour le respect des directives d'accessibilité numérique.
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.