Convert PDF to BMP Online
Convert PDF pages to BMP images online without any sign-up.
BMP (Bitmap) is one of the oldest and most straightforward image formats, storing pixel colour data with no lossy compression. This makes BMP files very large compared to modern formats, but also means the image data is completely uncompressed and lossless. BMP is still used in some legacy systems, industrial applications, and document management workflows that expect uncompressed bitmap files. If you need to extract PDF pages as BMP images for compatibility with such a system, Dockitt converts each page directly in your browser using PDF.js and a built-in BMP encoder, with no server upload required.
How to use
- Click 'Choose PDF' and select the PDF file you want to convert to BMP images.
- Click 'Convert to BMP' and wait while each page is rendered and encoded.
- Download the BMP images. Each page of the PDF becomes one individual BMP file.
FAQ
When would I need a PDF page as a BMP file?
BMP is most commonly required in legacy software environments, industrial imaging systems, and some document management systems that only accept uncompressed bitmap files. If a specific piece of software or a workflow requires BMP input and you only have a PDF, this tool is the quickest way to extract the pages in the right format.
Why are the BMP files so large?
BMP stores every pixel as raw colour data with no compression. A single A4 page rendered at standard screen resolution can easily be 5–20 megabytes as a BMP file, compared to a fraction of that as a JPG or PNG. This is inherent to the format. If file size is a concern and the receiving software can accept PNG, use the PDF to PNG converter instead, which provides the same lossless quality at dramatically smaller file sizes.
Will each page become a separate BMP file?
Yes. Each page of the PDF is exported as an individual BMP image. A 5-page PDF produces 5 separate BMP files. There is no option to combine pages into a single BMP file, as BMP is a single-image format.
Does BMP support transparency?
Standard 24-bit BMP does not support transparency. Transparent areas in the source PDF will be rendered with a white background in the BMP output. If you need transparency preserved, use PDF to PNG instead, which fully supports alpha channel transparency.
The conversion seems slower than other formats. Why?
BMP files for high-resolution pages can be very large — sometimes tens of megabytes per page. The browser needs to encode and process this data in memory. For PDFs with many pages, this can take a noticeable amount of time compared to JPG or WebP. If speed is a priority, consider using JPG or WebP, which are much smaller and faster to encode.
Is the conversion done in my browser or on a server?
The PDF to BMP conversion is handled entirely in your browser using PDF.js for rendering and a built-in BMP encoder for producing the output files. Your PDF is not uploaded to any server at any point. The entire process happens locally on your device.