PBM is a document format: it stores data in the PBM format. BMP is a image format that stores uncompressed pixel data in a simple row-by-row grid, resulting in large file sizes but zero quality loss. This renders each page as a raster image, making the content viewable without a document reader. Each page is rendered at the specified DPI and saved as a separate image; text in the output is no longer selectable. Converting between these two formats is common when the source application does not support BMP natively or when the target platform only accepts BMP. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.