One BMP in, one PDF page out
Add a bitmap and you get a PDF with that picture on one page. The converter takes the first frame of the file, so there is nothing to arrange or reorder.
BMP to PDF Converter
Add a BMP file and get a PDF with the picture on a single page. No sign-in was needed in our test.
To convert bmp to pdf, add the .bmp file, keep PDF as the output format and download the result. In our test, a 2.9 MB 24-bit BMP became a 189 KB pdf with one page, and the picture inside matched the original pixel for pixel.
Transfers use HTTPS, and files converted on the free tier are deleted after 24 hours, so the result is not a long-term archive. Quality depends on the source file, so open the PDF file once before you share it.
Need more PDF options? Open the PDF Converter hub.
FromBMPLosslessTransparency
BMP (Windows Bitmap)
A raster format introduced by Microsoft that stores pixels with little or no compression, so files are large. It supports depths from 1 to 32 bits per pixel, and version 5 added optional alpha and embedded colour profiles. A 32-bit file may or may not use its fourth byte for transparency. Files begin with the letters BM.
ToPDFLossless
PDF (Portable Document Format)
A fixed-layout document format published as ISO 32000. Each page records the exact position of every character, image and line, usually with the fonts embedded, so it displays and prints identically in any reader and is awkward to edit.
A 1200 × 800 px BMP and a 32-bit BMP with transparency, converted on indox.org
- BMP, 24-bitthe original, 1200 × 800 px, 96 dpi
- 2.9 MB
- PDFfrom indox, 1 page, 900 × 600 pt, about 15 times smaller
- 189 KB
- BMP, 32-bit alphathe original, 1200 × 800 px, 300 dpi, left half transparent
- 3.8 MB
- PDFfrom indox, 1 page, 288 × 192 pt, transparent half turned white
- 101 KB
Why use indox to convert BMP to PDF?
Nothing to install
The conversion runs on indox servers, so it works the same on Windows, Mac, Chromebook, Android and iPhone. You do not need Paint, Preview or a PDF printer driver.
The picture is stored without JPEG loss
In our test the PDF held the image as a Flate stream, which is lossless, not as JPEG. The 1200 × 800 pixels we extracted from it were identical to the BMP.
Page size follows the BMP's dpi
The PDF page is sized from the dpi value stored in the BMP. This page shows what that did in our test, so you can tell when a small or large page is expected.
What happens to your BMP
Stays
- Your original BMP, which is not touched
- The pixel size, 1200 × 800 in our test
- The colours of an opaque image, pixel for pixel in our test
- The picture, stored without JPEG loss
Changes
- Page: the picture is placed on one PDF page sized from the dpi in the BMP
- File size: 2.9 MB became 189 KB in our test, for a smooth image
- Transparency: alpha is flattened to white
- Format: a picture file becomes a document file
How do I convert BMP to PDF online?
- 1
Add your BMP file
Drop the file on the box or choose it from your device. Keep the original BMP, since it is your uncompressed master.
- 2
Confirm PDF, then start the conversion
Check that PDF is the output format on the converter, then start the conversion. In our test it took 3.7 seconds from the click to Completed for a 24-bit file.
- 3
Download the PDF and check the page size
Save the PDF and open it once. Look at the page size in your viewer's document properties before you print, because it follows the dpi stored in the BMP.
What do I get from indox's BMP to PDF converter?
Add a BMP and get a PDF with the picture on one page, ready for forms, email and print shops. The page states what the conversion keeps and what it drops, so you can tell before you start whether it fits the job.
- One PDF for the BMP you add, in a few clicks
- Nothing installed on Windows, Mac or a phone
- Measured on a real run, with sizes and page dimensions shown
- Your original BMP is left as it was
What are the limits for BMP to PDF?
Size
The upload box shows the live size limit before you add a file. Signing in raises it; a paid plan does not change it.
Formats
BMP in, PDF out. Pick another output on the converter if you need a different format.
Privacy
Files are encrypted in transit over HTTPS and processed on indox infrastructure.
Deletion
Free-tier files are kept for 24 hours after the job finishes, then deleted automatically.
Limits worth knowing
- Transparency is not kept. A BMP with an alpha channel gets a white background where it was transparent. If you need transparency, choose a different target format for that file.
- The page size follows the dpi stored in the BMP and you cannot set it on this converter. A file saved at 300 dpi gave a 4 × 2.7 inch page in our test, and a file with no dpi value was not tested.
- We converted one file per run. Merging several BMPs into one PDF was not tested, so do not rely on it. Convert each image on its own and combine the PDFs in a PDF tool if you need one document.
- Only the first frame of the BMP is used, and the picture is placed as an image. The PDF has no selectable text, so a scanned page stays a picture.
- We did not test 1-bit or 256-colour palette BMPs, or very large images. Check the first result for those before you send it on.
When the result is not what you expected
| What you see | Why | What to do |
|---|---|---|
| The page is tiny | The BMP stores a high dpi value, and a 300 dpi file gave a 4 × 2.7 inch page | Scale to fit when printing, or resave the BMP at 96 dpi in an editor and convert again |
| The page is larger than a sheet of paper | A 96 dpi file gave a 900 × 600 pt page in our test, wider than A4 | Scale to fit when printing, or raise the dpi value in an editor and convert again |
| A transparent logo has a white box | Alpha is flattened to white in the PDF | Put the logo on the background colour you want in an editor before converting |
| I need several images in one PDF | We converted one file per run and did not test merging | Convert each image, then combine the PDFs with a PDF tool |
| I need a small picture, not a document | PDF is a document format | Use BMP to JPG for a smaller image file |
What do the free and paid plans add?
Free
- All converters
- Daily credit refresh
- Email support
Basic
- Access to all features
- AI Extract
- Priority conversions
- Email support
Highest priority
Premium
- Everything in Basic
- Highest priority queue
- Priority support
Pay-As-You-Go
- No subscription
- Credits never expire
- Opt-in auto-refill
- Access to all features
Which conversions are close to BMP to PDF?
BMP vs PDF: what is the difference?
| Compared on | BMP | |
|---|---|---|
| Purpose | A bitmap picture, one image per file | A document with pages that can hold images and text |
| Compression | None or very little, so files are large | Images can be compressed with or without loss; our test used lossless |
| Transparency | Optional alpha in 32-bit files | Not kept by this converter; transparent areas become white |
| Size on screen | Pixels, with an optional dpi value | A page size in points, set from the dpi value here |
| Where it opens | Image viewers and editors; many forms refuse it | Any PDF viewer, browser, phone and print shop |
Who can use a BMP to PDF converter?
When to use it
- Sending a scanned receipt or letter saved as BMP to an office that accepts PDF only.
- Attaching a Paint drawing or screenshot to a form that rejects image files.
- Making a viewable copy of a legacy bitmap for email while keeping the BMP as the master.
- Preparing a diagram saved as BMP for a print shop that asks for PDF.
Where can I read more about converting files?
Sources
- Bitmap Image File (BMP), Version 5Library of Congress
- BITMAPV5HEADER structure (wingdi.h)Microsoft Learn
- PDF, Version 1.7 (ISO 32000-1:2008)Library of Congress
Facts checked on November 5, 2026
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BMP to PDF FAQs
How do I convert BMP to PDF for free?
Open the converter, add your BMP file, keep PDF as the output and download the result. You do not need a PDF printer or any software on your computer, and we were not asked to sign in.
Does converting BMP to PDF reduce image quality?
Not in our test. The PDF stored the picture as a lossless Flate stream, and the pixels we extracted were identical to the BMP. Only transparency is lost, because it turns white.
Why is my PDF page so small or so large?
The page size comes from the dpi stored in the BMP. A 1200 × 800 pixel image at 96 dpi gave a 900 × 600 pt page in our test, and the same pixels at 300 dpi gave 288 × 192 pt. The picture is intact; only the page size changes.
Is the PDF smaller than the BMP?
Usually, because BMP stores pixels with little compression. In our test a 2.9 MB BMP gave a 189 KB PDF. That image was a smooth gradient, so a photo will compress less.
What happens to transparency in a 32-bit BMP?
It is flattened onto white. The half of our test image with alpha 0 became pure white in the PDF, and the opaque half matched the BMP.
Can I merge several BMP files into one PDF?
We did not test it. Convert the images one at a time, then combine the PDFs with a PDF tool if you need a single document.
Can I choose the page size or quality?
No such option appeared in our run. The page size follows the BMP, and the picture is stored without JPEG loss. To change the page size, change the dpi in an image editor and convert again.
Should I choose PDF or JPG for my BMP?
Choose PDF when a form or print shop asks for a document. Choose JPG when you need a small picture to post or send, with the usual loss of detail.