About BMP to JPG conversion
BMP is the classic Windows bitmap format, and most BMP files are stored with no compression at all. A single full-screen capture or flatbed scan can easily be 10–25 MB. If you have inherited a folder of old scans, Paint exports, or industrial equipment screenshots in BMP, converting them to JPG can cut their size by ninety percent or more with little visible change.
Your browser decodes common uncompressed and run-length encoded BMP files natively, and the converter re-encodes them as JPEG at the quality you choose. For scanned photographs, quality 85 is a good default. For scans of printed text or line drawings, stay at 90 or above so letter edges stay clean, or consider PNG output instead, which is lossless and still far smaller than BMP for documents with large blank areas.
Unusual BMP variants — such as some 16-bit or OS/2-era files — may not decode in every browser. If a file reports that it could not be read, try opening it in another browser. Everything is processed locally, which matters when old scans contain personal records.
How to do it
- Open the Image tool with the button above; JPEG output is already chosen.
- Add the .bmp files you want to shrink.
- Choose quality: about 85 for photos, 90+ for scanned text.
- Optionally limit the max width to downsize large scans.
- Convert, then download the JPGs and compare the file sizes.
