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Drop one BMP or two hundred. Batch conversion is not a paid feature here.
Convert BMP to PDF
Output from an old scanner or a Windows utility is a pile of bitmaps that has to be filed as one document.
Runs on your deviceFreeNo sign-upBatch supported
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
BMP and PDF are not the same picture in two wrappers.
Each bitmap is placed on a page sized to its aspect ratio and compressed on the way in, which is the single biggest change here: uncompressed BMP data would make an unusable PDF.
Worth knowing first
Raw BMP data would inflate the PDF enormously, so the image has to be compressed as it is embedded. A 6 MB bitmap becomes a few hundred kilobytes of JPEG in the page. For bitonal scans of text, that trade is worth checking at a high quality setting.
Questions
BMP to PDF, answered
Can I merge several BMPs into one PDF?
Yes, one page per bitmap, in the order you set.
Why is the PDF so much smaller than the BMPs?
BMP stores every pixel uncompressed. The PDF stores a compressed version of the same image.
How to convert BMP to PDF
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Choose your settings
Portable Document Format is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.