A BMP stores every single pixel as raw, uncompressed data — typically three bytes per pixel, with no compression of any kind. That is why a bitmap of a plain screenshot is substantially larger than the same picture saved as a PNG or JPG, which do compress the pixel data. When Utilitly places your BMP into a PDF, the image is re-encoded with PNG compression, so the document you download is normally smaller than the bitmap you started with.
No. BMP is a lossless format and so is the PNG encoding used inside the PDF, so the conversion is lossless end to end — every pixel survives exactly. This is different from converting to JPG, which discards detail to save space. You get a smaller file and an identical image.
Bitmaps often come from somewhere less casual than a phone camera — a flatbed scanner, medical or industrial capture equipment, an internal screenshot tool. Those are exactly the files least suited to being handed to a third-party web service. Utilitly reads, converts, and saves the BMP entirely on the machine that already has it, so the bitmap never leaves the device that produced it in the first place.
It also handles the other formats you might need to mix in:
Add your BMP file (or several) to the tool above, arrange the order if you have more than one, and download the result. Everything runs in your browser — the file is never uploaded.
BMP stores every pixel uncompressed, with no compression applied at all. A bitmap is therefore larger than the same image saved as PNG or JPG, which is why converting to PDF — a step that re-encodes it with compression — usually produces a smaller file.
No. BMP is lossless and the PNG encoding used inside the PDF is lossless too, so every pixel is preserved. Nothing is discarded or softened.
Yes. Add as many bitmaps as you like and they become pages of a single PDF, one image per page, in the order you add them.
Your bitmap never actually goes online. The conversion runs in your browser with pdf-lib, an ordinary JavaScript library, so the file is never transmitted or stored on a server.
BMP, short for bitmap, is a Windows image format that stores pixels without compression. Microsoft Paint, older scanners, and some industrial and medical capture software still produce them.
Yes. Bitmaps, JPGs, PNGs, WebP, GIF, SVG and AVIF can all become pages of the same document.