1Upload your BMP images and wait for the preview to appear.
2Drag out the region you want to keep, or lock the selection to 1:1, 4:3 or 16:9 and drag freely inside that ratio.
3Confirm the crop — the same rectangle is applied to every file you uploaded, which is how a set ends up genuinely consistent.
4Download the cropped BMP file, with everything outside the frame discarded.
Crop BMP FAQ
How does Crop BMP select and cut the area?
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Concretely, the pixel rectangle you select is written straight out again with no re-encoding step at all, so a crop of a lossless image is exactly the corresponding region of the original, byte for byte. You drag the region you want directly on the preview, or type exact pixel coordinates if you already know them.
Can I crop to a fixed aspect ratio?
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Yes. Lock the selection to 1:1, 4:3, 16:9 or any custom ratio and drag freely inside that constraint — which is how you get a set of images that all fit the same layout slot without measuring anything.
Does my source format change how a crop behaves?
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It can. BMP is essentially raw uncompressed RGB rows with a small header, so it is perfectly lossless and enormous — often 10-20x the size of the same image as PNG. That decides whether the crop is a pure pixel operation or whether the file has to be rebuilt around it.
Anything specific to BMP worth knowing before I crop?
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Yes — because nothing is compressed, a BMP is fast to read and edit but punishing to upload, and it carries no metadata to preserve. That is the sort of detail that only shows up after you have overwritten the original.
What is the most common mistake when cropping BMP images?
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Cropping before resizing. Crop first from the full-resolution original, then resize the result — doing it the other way round means the region you keep has already lost detail it did not need to lose.
Can I crop several files to the same region at once?
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Yes, and that is the case worth doing here rather than in an editor: the same rectangle is applied across the batch, which is how a set of product shots ends up genuinely consistent instead of approximately consistent.
What can I upload to Crop BMP?
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PNG, BMP and TIFF are the lossless raster formats this handles directly, and lossy sources (JPG, WebP, GIF) work too if you want them in the same batch. Multi-page TIFFs are detected and handled page by page.
Is there a file size limit on Crop BMP?
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Yes: free accounts process images up to 5 MB each; lossless sources hit that ceiling sooner than photographs do, because nothing has been thrown away yet. If you are over it, converting to PNG first is often enough on its own — a BMP is routinely ten to twenty times the size of the identical image as PNG.
Will Crop BMP lower the quality of my BMP images?
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No. A lossless source round-trips bit-exactly, so unless you explicitly ask for a lossy output format the pixels that come back are the pixels that went in. That is the whole reason to keep working in this family while you are still editing.
Can I run Crop BMP on several BMP images at once?
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Yes — upload the set and they process in parallel under one set of settings. Lossless files are larger, so a big batch is bound by your upload speed rather than by the processing itself.
Does the alpha channel survive?
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Yes. PNG and TIFF carry a full 8-bit alpha channel and it is preserved end to end. It is only flattened if you deliberately target a format that has no alpha, in which case transparent pixels are composited onto white.
Does Crop BMP cost anything?
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No. Crop BMP runs free without an account and adds no watermark. Files are removed from the workers shortly after you download, and nothing about the image is retained.
