Image guides
How to Convert PNG to BMP in Your Browser
PNG already stores images losslessly and compresses them; BMP does neither. Converting drops PNG’s compression and its transparency support in exchange for a format some legacy Windows software still expects. This guide covers exactly what that trade costs.
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How PNG becomes BMP
The browser decodes PNG’s deflate-compressed pixel data — including any alpha channel — and writes it into a 24-bit BMP structure with no compression and no alpha plane.
What changes when you convert
Any transparency in the source PNG is flattened onto a white background, since this BMP output has no alpha channel at all — a step PNG-native software would never require. File size grows because BMP stores every pixel uncompressed, while PNG’s deflate compression made the original comparatively small.
When BMP is the right choice — and when it isn’t
Choose BMP only when the destination is genuinely old — legacy Windows software, certain print pipelines, embedded tooling — that explicitly can’t read PNG. If your PNG has any transparency you need to keep, BMP is the wrong target entirely; TIFF or ICO preserve alpha where BMP here does not.
Limitations and privacy
The file is validated as real PNG data — signature bytes checked, not just the filename — before conversion. Conversion runs locally in your browser; the file is not uploaded to Looty Tools servers.
Convert PNG to BMP FAQ
- Will my transparent background survive the conversion?
- No. It is flattened onto white, since this BMP output has no alpha channel.
- Is there a BMP option that keeps transparency?
- Not in this tool. Use TIFF or ICO instead if you need to keep an alpha channel from the source PNG.
- How much bigger does the file get?
- Usually noticeably, since BMP stores pixels with no compression at all, unlike PNG’s deflate compression.
- Does the tool check that my file is really a PNG?
- Yes, by signature bytes, not by the filename or extension.
- Is my image uploaded anywhere?
- No. Conversion runs locally in your browser and does not upload your file to Looty Tools servers.
Related guides
- Convert JPG to BMPConvert a JPG, JPEG, or JFIF file to an uncompressed 24-bit BMP locally: choose the file, download the result, and understand the file-size tradeoff.
- Best Format by Use CaseA quick reference for choosing between JPG, PNG, WebP, AVIF, TIFF, ICO, TGA, QOI, and PPM based on what you are actually trying to do.
- Convert Images Without UploadingLearn what browser-local image conversion means on Looty Tools, what stays on your device, and how Image Converter avoids a conversion upload.
