PDF to BMP's Ghostscript command sets the bmp16m device without any separate compression option, so every page is written as a full, uncompressed bitmap.
Adobe's own comparison of BMP and PNG describes BMP as storing pixel data with little to no compression, unlike PNG which compresses the file. BMP vs. PNG: Which is better?
PDF to BMPWhy Are Bmp Files So Large After Pdf Conversion
Upload the PDF file to the conversion form directly.
Select the BMP output format from the conversion menu before moving on to the next step.
Click the start button to begin the conversion process right away.
The same command fixes the render resolution at 150 DPI, so a larger page produces more uncompressed pixel data before the file is even written.
Checking Output Size And Choosing Alternatives
Download the finished BMP file from the results screen directly.
Check the exact file size yourself afterward using your operating system's own file properties dialog box.
Open a separate PDF to PNG tool for a smaller resulting output instead.
Continue with 24-bit color depth details or Output zip file options.
Frequently Asked Questions about Why Are BMP Files So Large After PDF Conversion
How do I start the PDF to BMP conversion?
Upload the PDF file using the link provided below.
Where do I find the converted BMP file?
Download the finished PDF from the results screen once ready.
How do I check the size of the new file?
Select Properties from the downloaded file right-click menu to view its exact size.
What should I do if the BMP file is too large?
Use a PDF to PNG converter instead to get a compressed image file.