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Drop one BMP or two hundred. Batch conversion is not a paid feature here.
Convert BMP to PNG
A large uncompressed bitmap needs to shrink without losing a single pixel, usually because it is a screenshot, a scan or a UI asset.
Runs on your deviceFreeNo sign-upBatch supported
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
BMP and PNG are not the same picture in two wrappers.
PNG applies DEFLATE with per-row filtering over exactly the same pixels. Nothing is approximated, yet screenshots and flat graphics commonly drop by 80 to 95 percent because BMP was storing every identical pixel in full.
Worth knowing first
BMP rows are stored bottom-up and padded to four-byte boundaries, which is why some naive converters output an upside-down image. That padding is also part of why the file was so big; PNG has none of it.
Questions
BMP to PNG, answered
Is any quality lost?
None. PNG is lossless, so the decoded PNG is bit-identical to the decoded BMP.
PNG or JPG for a scanned document?
PNG if it is text or line art, which is most scans. JPEG smears the edges of letters and saves less than you would expect on high-contrast pages.
How to convert BMP to PNG
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Choose your settings
Portable Network Graphics is lossless, so nothing is thrown away in the conversion.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.