Convert BMP to PNG Online
Turn BMP files into PNG directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert BMP to PNG nowHow to convert BMP to PNG
Open the converter
Click the button to open the BMP to PNG tool. It loads instantly — no install, no signup.
Drop your BMP file
Drag your BMP file into the upload area or click to browse. The file stays in your browser memory only.
Download PNG
The conversion runs locally and finishes in seconds. Click download to save the PNG file to your device.
BMP vs PNG at a glance
Key technical differences between the two formats, so you know what to expect before converting.
| Feature | BMP | PNG |
|---|---|---|
| Type | Raster image | Raster image |
| Compression | Uncompressed / text | Lossless |
| Transparency | — | Full alpha channel |
| Animation | No | — |
| Bit depth | 1–32 bit/pixel | 1–16 bit/channel |
| Browser support | All browsers | All browsers |
| Extensions | .bmp | .png |
| MIME type | image/bmp | image/png |
| Introduced | Microsoft | 1996 · PNG Development Group / W3C |
What changes when you convert BMP to PNG
- Both formats are lossless, so the pixels in the PNG file are identical to the BMP source. Only the container and compression method change.
- PNG compresses more efficiently than BMP, so the converted file is usually noticeably smaller at similar visual quality.
About BMP
BMP (bitmap) is a Microsoft raster format that normally stores pixels uncompressed. It is simple to read and write, which is why it still appears in older Windows software and hardware tools.
- Best for
- Legacy Windows applications, embedded systems and tools that need raw pixel data.
- Strengths
- No compression artifacts, trivial to decode.
- Limitations
- Huge files, poor web support in practice and no reliable transparency.
About PNG
PNG (Portable Network Graphics) is a lossless raster format created as a patent-free replacement for GIF. It supports full alpha transparency and up to 16 bits per channel.
- Best for
- Screenshots, logos, UI graphics, diagrams and any image that needs a transparent background or pixel-perfect edges.
- Strengths
- Lossless quality, full transparency, opens everywhere.
- Limitations
- Photos produce large files compared with JPG, WebP or AVIF.
Frequently asked questions
Is the BMP to PNG conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the BMP to PNG converter. We support the project through unobtrusive ads.
Are my BMP files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The BMP bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For BMP input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
Does converting BMP to PNG reduce quality?
No. Both formats are lossless, so every pixel is preserved exactly.
Will the PNG file open everywhere?
Yes. PNG is supported by every modern browser, operating system and most apps, so it is the safe choice for sharing.
Related guide
PNG vs JPG vs WebP: Which Format to Use WhenRelated conversions
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