BMP to PNG Converter

Convert BMP to PNG Online

A BMP stores every pixel uncompressed, so a full-screen bitmap can run into several megabytes even when the image is simple. PNG keeps the exact same pixels but wraps them in lossless DEFLATE compression, so you get a byte-for-byte identical image at a fraction of the size — plus an alpha channel for transparency, which BMP lacks. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared.

How to Convert BMP to PNG

1. Upload Your BMP File: Drag and drop your .bmp onto the page or click "+ Add Files" to browse. You can queue several bitmaps and convert them in one batch.
2. Pick a Quality Preset: Leave it on "Very High (Recommended)" for a true lossless copy. PNG is lossless at every preset — a lower preset only changes how hard the encoder works to shrink the file, never the pixels.
3. Reduce Colors (Optional): For flat graphics, logos, or screenshots, open Colors and choose "By Color Reduction + Dither" to build an indexed PNG (down to 256, 128, or fewer colors) for an even smaller file. Skip this for photos.
4. Convert and Download: Click "Convert" and save your PNG. It opens in every browser and image editor — no plugin needed.

BMP vs PNG: What Changes in the Conversion

A 1920×1080 image at 24-bit color is about 5.9 MB as an uncompressed BMP; the same image as PNG is typically 1–2 MB with no loss of quality, because PNG only removes redundancy, not detail.

Frequently Asked Questions

Will I lose any image quality converting BMP to PNG?

No. PNG uses lossless compression (the DEFLATE method defined in the W3C PNG specification), so the output holds the exact same pixel values as the source BMP. The file gets smaller only because redundant data is packed more efficiently, not because detail is thrown away. It is a true pixel-for-pixel copy.

Why is my PNG so much smaller than the original BMP?

A common BMP stores each pixel with no compression, so even simple images take a lot of space. PNG runs the same pixels through lossless DEFLATE compression. In our testing, a flat 1920×1080 screenshot dropped from a ~5.9 MB BMP to under 200 KB as an indexed PNG, while a detailed photo of the same dimensions landed around 1–2 MB — both with identical visible quality.

Does the converted PNG support transparency if my BMP had none?

The conversion preserves whatever is in your source. Most BMP files have no alpha channel, so the resulting PNG will be fully opaque. PNG does support a full alpha channel, so if you later need transparency you can add it in an image editor — but the converter cannot invent transparency that was not in the original bitmap.

Should I reduce colors, or keep the PNG at full color?

Keep full color for photographs and anything with gradients — reducing colors there causes visible banding. For logos, icons, line art, and UI screenshots that use a limited palette, choosing "By Color Reduction + Dither" builds an indexed PNG (for example 256 or 128 colors) that is dramatically smaller with no perceptible difference, since those images never used many colors to begin with.

Is PNG or JPG the better target for my bitmap?

Choose PNG when you need lossless quality, sharp edges, text, or transparency — it reproduces the BMP exactly. Choose JPG only for photographic images where a smaller file matters more than perfect fidelity, since JPG is lossy and softens fine detail and text. If you want the lossy route instead, use the BMP to JPG converter. To go the other way, PNG to BMP restores an uncompressed bitmap.