Convert BMP bitmaps into lossless PNG files, right in your browser. Nothing is uploaded.
BMP is an old, largely uncompressed bitmap format, so its files are enormous for what they contain. PNG stores the very same image without throwing away any detail, yet applies real compression, so you keep every pixel exactly while ending up with a far smaller file. Converting BMP to PNG is the natural move when you want a modern, widely supported, lossless copy of an old bitmap.
To use it you add your BMP files by dragging or browsing, and the tool produces PNG versions to download. Because PNG is lossless there is nothing to tune, so it is close to one click. You can process a batch of bitmaps together, which is a relief when you are converting a stack of old images at once.
The key point is that this conversion keeps the picture pixel-for-pixel identical, since both formats are lossless, while PNG's compression removes the wasteful bulk of BMP. PNG also supports transparency, so if the bitmap carried an alpha channel it is preserved. For photographs, though, PNG files can still be sizeable, and JPG would produce something much smaller if perfect fidelity is not essential.
Pick PNG over JPG when you need an exact copy, when the image has transparency, or when it is a screenshot, diagram, or logo where sharp edges must stay clean. If the BMP is an ordinary photo headed for the web or email, JPG will usually be the smaller and more practical target. The decision really turns on fidelity versus file size.
Common uses include modernizing old scanned or exported bitmaps into a shareable format, keeping a screenshot crisp for documentation, preserving a transparent graphic that was stored as BMP, and reducing storage use without giving up any image detail.
It all runs in your browser, so your files stay on your device and nothing is uploaded. There is no fee and no sign-up. The only real limit is your device's memory, and because BMP files are large from the start, a big batch is heavier on an older computer than a newer one.
Yes, PNG is lossless, so every pixel from the bitmap is preserved perfectly. You get an identical image in a far more efficient container.
PNG applies genuine lossless compression, packing the same data into fewer bytes, while BMP stores it almost raw. That is why the picture looks the same but the file shrinks.
For a photograph JPG is usually smaller and perfectly acceptable, while PNG keeps exact detail at a larger size. Use PNG when fidelity or transparency matters and JPG when size does.
Yes, PNG supports an alpha channel, so any transparent areas carry across intact. That makes PNG the right choice for logos and icons.
Yes, add a batch and download the PNGs in one go. Since bitmaps are large, heavy batches use plenty of memory on older machines.
The work happens in your browser on your own device, so once the page is loaded your files are processed locally. Nothing is uploaded to a server.
Polished Pixels. All tools. About. Contact. Every tool runs in your browser and your files are never uploaded.