How to Convert BMP to PDF
BMP is the format that time forgot. Windows programs, old scanners and legacy imaging systems still produce it, and it stores every pixel with almost no compression — which is why a single A4 scan can weigh 25 MB. Nobody wants that in an inbox, and most upload forms will reject it outright.
Converting BMP to PDF solves two problems at once. The images become ordered pages inside a single document that opens anywhere, and the file gets dramatically smaller along the way. This guide covers the conversion in the browser, with no software to install.
Ready to do it now? Open BMP in PDF and get your file in a few seconds.
Open the toolWhen you need BMP to PDF
- Archiving scans from an older scanner or a legacy document system that only writes BMP files.
- Sending bitmap images to someone whose device may not open BMP at all — phones and browsers often refuse it.
- Preparing an upload for a form or portal that accepts PDF only, which is nearly all of them.
How to convert BMP to PDF step by step
Open the BMP to PDF tool
Go to the BMP to PDF page. Everything runs in the browser — no installation, no registration.
Upload the bitmaps
Drag the BMP files onto the upload area or select them from the dialog. Because BMP files are large, give the upload a moment on a slow connection.
Order the pages
Rearrange the thumbnails by dragging them and delete anything that does not belong. This is the page order of the finished PDF.
Choose page size and margins
A4 or Letter is right for scanned paperwork that will be printed or filed. Fit-to-content matches each page to the image itself, which suits screenshots and diagrams.
Convert and download
Start the conversion and download the finished document. Compare it with the originals once — scanned text should still be easy to read at 100% zoom.
Common problems and how to fix them
Uploading takes a long time
That is BMP being BMP: uncompressed images are simply enormous. The upload is the slow part, not the conversion, and the resulting PDF will be a fraction of the size.
The PDF is still heavy
Scans at 600 dpi carry far more detail than any screen or office printer can show. Run the document through Compress PDF — for text scans this often removes most of the weight with no visible difference.
Colours look washed out
Some old scanners write BMP files with a limited palette, and that limitation travels with the image. Rescanning in full colour, or converting to grayscale deliberately for a cleaner look, both give better results than trying to fix it afterwards.
BMP or PDF: which one to keep
BMP has one real advantage — it is completely uncompressed, so nothing is ever thrown away. That matters for image forensics or archival masters, and almost nowhere else. In everyday use its size makes it impractical and its support outside Windows is patchy.
PDF keeps the picture perfectly readable, adds page structure, and produces a file you can actually email. For anything that is really a document — a scan, a form, a receipt — PDF is the format to store and send, and PDF to BMP is there if you ever need the raw bitmaps back.
Domande frequenti
Why is my BMP file so large?
BMP stores each pixel individually with virtually no compression. A colour A4 page at 300 dpi is roughly 25 MB, where the same page as a PDF is usually a few hundred kilobytes.
Will the conversion reduce quality?
The image is embedded at its original resolution, so the visible detail is unchanged. Size drops because PDF compresses the data, not because pixels are discarded.
Can I convert several bitmaps into one PDF?
Yes. Upload them all, arrange the order, and keep the merge option enabled to get a single multi-page document.
Is there a size limit per file?
Each file can be up to 100 MB, which covers even large uncompressed scans, and there is no daily quota.
Can I get the images back afterwards?
Yes — the PDF to BMP tool extracts every page of a PDF back into bitmap files.
Do I need an account?
No. The tool is free, requires no registration, adds no watermark, and uploaded files are deleted an hour after processing.
Ready to do it now? Open BMP in PDF and get your file in a few seconds.
Open the tool