BMP to PNG Converter

About the BMP to PNG Converter

BMP and PNG both store every pixel exactly, but PNG adds lossless compression — so you get the same detail in a much smaller, more portable file that modern apps and websites accept. This tool re-encodes your BMP bitmaps to PNG on your own device, with no upload and no watermark, keeping the image pixel-for-pixel identical.

A pixel-for-pixel copy, several times smaller

PNG combines row filtering with DEFLATE compression, both of which are lossless — decode the PNG and you get back precisely the bytes the BMP held. How much you save depends on content rather than on any setting: screenshots, diagrams and flat-colour graphics routinely compress ten to twenty times, while a photographic bitmap full of sensor noise may only manage two or three. Either way the result is strictly smaller than an uncompressed BMP, and strictly identical as an image.

Why this is usually the right conversion for a BMP

BMP is a Windows-era container that email clients, web forms and chat apps regularly refuse, and that many photo libraries will not index. PNG is accepted everywhere, preserves the exactness that made someone choose BMP in the first place, and adds an alpha channel that most BMP files cannot store. Reach for JPG instead only when the bitmap is a photograph and file size matters more to you than keeping every pixel.

Frequently asked questions

Is BMP to PNG lossless?

Yes. PNG uses lossless compression, so the converted image is pixel-for-pixel identical to the BMP — just in a much smaller, more widely supported file.

Why is the PNG smaller than the BMP?

BMP stores images with no compression, while PNG compresses the same pixels losslessly. That usually cuts the file size substantially with no change to the image.

Is it private?

Yes. The conversion runs entirely in your browser, so your bitmaps are never uploaded to a server.

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