What happens to a BMP in the PDF
BMP files are usually stored without compression, which is why a simple screenshot can be many megabytes. Your browser opens BMP natively, and the tool stores the pixels in the PDF as PNG, which is lossless and much more compact than the bitmap: every pixel stays as it was, but the file shrinks. With "Smaller file" on, the image is saved as a JPG with at most 2000 pixels on the long side instead, which is the better choice for photos saved as BMP but blurs the sharp edges of text in a screenshot a little.
Each BMP becomes one page. A4 or Letter centers it on a standard page with the margin you pick, Fit to image makes the page the shape of the picture. If you only need the images in a smaller format rather than a PDF, BMP to JPG converts them one by one; Compress PDF shrinks the finished PDF, and Merge PDF joins it with other documents.
How to convert BMP files to PDF
- 1Drop the files on the box above, choose them from your device, or paste an image from the clipboard.
- 2Put them in order, rotate any that are sideways, and pick the page size, fit and margin.
- 3Name the file and press Create PDF. The PDF downloads right away.
Frequently asked questions
Will the PDF be smaller than my BMP files?
Usually much smaller. BMP stores every pixel without compression, while the PDF stores the same pixels as PNG, which compresses flat colors and repeated patterns well. The result is still lossless.
Which BMP files work?
Any BMP or DIB file your browser can open, which covers the bitmaps that Windows, Paint and screenshot tools write. If a file cannot be opened, the list says so; saving it as PNG from an image editor is the way around it.
Can I mix BMP with JPG or PNG files?
Yes. Drop everything together. Each file becomes one page in the order shown, whatever its format.
Are my files uploaded?
No. Your browser reads the bitmaps and writes the PDF on your own device.