The BMP To PDF backend converts the uploaded image to PNG, a lossless format, before creating the PDF, so the conversion step itself introduces no additional compression artifacts.
Adobe's own BMP-to-PDF converter is marketed as turning BMP images into polished PDF documents in a few clicks. BMP to PDF Online for Free | Adobe Acrobat
BMP To PDFWhy BMP To PDF Keeps You From Losing Quality
The generated PDF document is created with pdfkit's default settings apart from autoFirstPage: false, and the PNG from the conversion step is passed to it unchanged.
When page size is set to Fit to content, the PDF page is sized to the image's exact original pixel dimensions with no scaling applied, so the image is embedded at its original resolution.
The page size selector defaults to A4 unless changed, which affects how the converted image is scaled onto each page.
Add the BMP photo you want to check for quality to the upload area.
Select Fit to content in the page size settings.
Save the quality-checked PDF once conversion completes.
Managing File Size and Resolution
Review the downloaded PDF to compare the image sharpness against the original BMP.
Check the file size of the generated PDF against your storage requirements.
Use the start-over option to process another file without reloading the page.
Continue with Combine Multiple BMP Into One PDF or BMP To PDF Page Size Margins Orientation.
Frequently Asked Questions about BMP to PDF Without Losing Quality
How do I reset the tool after downloading?
After downloading, a start-over option resets the tool so another BMP file can be checked for quality without reloading the page.
Where do I change the page size?
Open the page size selector and choose your preferred option.
How do I upload multiple BMP files?
Drag and drop the files into the upload area.
What should I do if the image looks blurry?
Select Fit to content to embed the image at its original resolution.