How Do You Convert BMP to PDF?
You convert BMP to PDF by adding your bitmap images to QuickCatPDF's BMP to PDF tool and clicking Convert to PDF. The PDF keeps every pixel of the original and is usually much smaller, because BMP files are normally stored without compression.
The conversion runs in your browser, so the images are never uploaded.
How to Convert BMP to PDF With QuickCatPDF
Converting BMP files takes four steps.
- Click Select images or drop your .bmp or .dib files on the page.
- Arrange the thumbnails and rotate or remove any image.
- Choose Page size and Margins if you'll print; keep Fit to image for screens.
- Click Convert to PDF, then Download PDF. The result shows the size change, for example "BMP 1.4 MB → PDF 8 KB".
Why Use QuickCatPDF for BMP to PDF?
QuickCatPDF makes BMP files small without losing a pixel. The tool compresses the image losslessly inside the PDF, using the same row filters PNG uses. In our test, a 1.4 MB, 800 × 600 BMP became an 8 KB PDF; your own savings depend on the image, and photos shrink less than screenshots or diagrams.
The result line after converting shows the real before-and-after size for your files, so you know exactly what you gained.
Your files stay on your device, which is safer for screenshots of internal systems and for old scanned documents.
What Is a BMP File?
BMP is the bitmap image format built into Microsoft Windows. It stores the colour of every pixel, usually with no compression, which makes files large but simple for software to read.
BMP still turns up in old programs, Windows screenshots, scanner software and industrial equipment. Converting to PDF makes these images easy to email, print and keep with other documents.
Which BMP Types Are Supported?
The tool opens standard Windows BMP files using your browser's built-in decoder, which handles the common types: palette images (1, 4 and 8-bit), true-colour images (24 and 32-bit) and run-length (RLE) compressed files. We tested 8-bit and 24-bit files. Grey images are saved in grayscale and pure black-and-white images at one bit per pixel, which keeps those PDFs especially small.
A few rare variants, such as some old OS/2 bitmaps, may not open. In that case the tool names the file it couldn't read and converts the others.
How Do You Combine Several BMP Images Into One PDF?
Add all the files and leave Output on One PDF; each image becomes one page, in the thumbnail order. Use Sort to order by name or date, and Images per page to put 2 or 4 images on one sheet.
If the BMPs are screenshots, PNG to PDF explains how lossless screenshots behave in a PDF. Need the PDF under an upload limit? Use Image to PDF under 200KB. Other formats can go into the same file through Image to PDF.
Screenshots saved as JPG photos convert on JPG to PDF, and several finished PDFs can be combined with Merge PDF.
Frequently asked questions
Does BMP to PDF reduce quality?
No, at the default Original (no quality loss) setting every pixel is kept. The file gets smaller only because of lossless compression.
Why is my BMP file so large?
BMP usually stores every pixel uncompressed: an 800 × 600 colour image takes about 1.4 MB however simple it is. A PDF with lossless compression stores the same pixels in far less space.
Is BMP to PDF free?
Yes, it's free, with no sign-up, no watermark and no daily limit.
Are my BMP files uploaded?
No, the conversion runs entirely in your browser, and the page works offline after your first visit.
Can I convert BMP to PDF on a Mac or phone?
Yes, the tool works in any modern browser, including Safari on Mac and iPhone and Chrome on Android.
What is the maximum BMP size?
Each file can be up to 100 MB and 100 megapixels. Batches above 150 images or 500 MB show a memory warning.
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