Convert BMP to PNG Online — Shrink Old Windows Bitmaps
BMP is the uncompressed dump a lot of old scanners and Paint still spit out. PNG keeps the pixels and usually slashes the size. This page does that encode in your tab so a 40 MB scan is not what you attach.
How it works
- 1Add your BMP file
- 2Convert to PNG in this browser tab
- 3Rename the result
- 4Download
When BMP → PNG is the right job
A scanner saved .bmp and you need something you can actually email.
An archive folder is nothing but Windows bitmaps.
How the conversion runs on this page
Drop BMP files, convert, rename. PNG is the archive-friendly output.
If a portal wants JPEG photos, use Convert BMP to JPG.
Quality, limits, and honesty
PNG is lossless from the decoded BMP. You should not see new blur.
Huge 24-bit BMPs can pause the tab while they decode. Be patient or crop first.
Privacy
Your BMP file is decoded in this tab. We do not upload it to convert it to PNG.
If a related job is next — compress a PDF, flatten another image, or switch pairs — use the links on this page so the file stays on your device the whole way.
100% On-Device Privacy & Security Guarantee
Unlike traditional online tools that upload your files to external cloud servers, wikawe processes all files locally in your browser using WebAssembly. Your documents never leave your device, preventing leaks and protecting sensitive records.
wikawe vs. Traditional Cloud Converters (iLovePDF, Smallpdf)
| Comparison | wikawe | Cloud Converters |
|---|---|---|
| File Privacy | 100% On-Device (Zero Uploads) | Sent to remote cloud servers |
| Processing Speed | Instant (Client-Side) | Slow upload/download queues |
| Usage Limits | Unlimited tasks & files | Strict hourly rate limits |
| Registration | No account required | Requires paid subscription |
FAQ
Why is BMP so large?+
It stores pixels with little or no compression. PNG is the usual next step.
Is BMP to PNG uploaded?+
No.
Will colors change?+
They should match the bitmap the browser decoded. Indexed BMP quirks are rare but possible.
Batch convert BMPs?+
Yes.
Is it free?+
Yes.