PSB to BMP Converter

Convert PSB to BMP online and see exactly what pixel decoding and image re-encoding changes, what BMP still can't promise, and how to verify the result.

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PSB to BMP: the pixel decoding and image re-encoding route explained

Photoshop large document data for canvases or file sizes beyond ordinary psd limits is decoded into a working pixel canvas first, then written back out under BMP's own color and compression model. Dimensions can stay exactly the same even as encoding, metadata, and fine detail change underneath. PSB parsing extends the Photoshop document model to very large canvases while retaining layers, masks, channels, effects, smart objects, and color data. BMP output writes a single flat pixel surface with an explicit row order and color depth, built for simple bitmap interchange rather than layers or multiple resolutions.

Decoded canvas - Photoshop Large Document data for canvases or file sizes beyond ordinary PSD limits. Written image - A broadly understood bitmap with straightforward pixel storage and little compression.

INPUT MODEL

PSB

PSB raster image

Used for pixel-based artwork, scans, and photographs.

Family: Images
MIME: image/vnd.adobe.photoshop

→

OUTPUT MODEL

BMP

BMP raster image

Designed for pixel-based artwork, scans, and photographs.

Family: Images
MIME: image/bmp

When to actually choose PSB to BMP

Choose BMP when its particular balance of compatibility, alpha, animation, and file size matches the destination better than PSB.

What changes between the PSB model and the BMP deliverable

The source stores Photoshop Large Document data for canvases or file sizes beyond ordinary PSD limits; the destination stores a broadly understood bitmap with straightforward pixel storage and little compression. Compare application metadata after that structural change.
PSB and BMP use different metadata conventions, so application-specific fields should be treated as optional until verified.

What the PSB source carries and the BMP output demands

PSB

What can fail when PSB raster image is interpreted

Many PSD-compatible tools do not support PSB, and a flattened export loses large-document layers, masks, and smart objects.

BMP

What BMP raster image cannot safely promise

BMP derivatives are often much larger than web images and may encode alpha or row order differently between apps.

ENGINE

How the BMP writer handles this route

a broadly understood bitmap with straightforward pixel storage and little compression is what gets written, labeled as image/bmp. Whether that actually opens depends on the receiving application, not on the file extension.

Checking the BMP result before you trust it

BEFORE

Record the PSB evidence before conversion

Verify canvas dimensions, bit depth, layer count, masks, type, smart objects, and saved composite in a PSB-aware editor.

AFTER

Test the BMP file in its receiving workflow

Confirm dimensions, color depth, orientation, and whether the receiving app reads transparency.