JPG to BMP Converter

Convert JPG to BMP Online

This tool decodes your JPG and re-saves it as a BMP — an uncompressed Windows bitmap that stores raw, per-pixel color data. Be clear about what that buys you: BMP does not improve quality. The detail JPEG already discarded cannot return, and any JPEG artifacts get baked into the bitmap. What you gain is an uncompressed file that legacy software, Windows utilities, and image-processing pipelines can read directly — at the cost of a much larger file.

How to Convert JPG to BMP

1. Upload Your JPG File: Drag and drop your .jpg, .jpeg, or .jfif file onto the page, or click "+ Add Files" to browse. You can queue several images and convert them in one batch.
2. Set the Quality Preset (Optional): Open Advanced Options to pick a Quality preset (High, Medium, or Low). Because BMP is uncompressed, this mostly affects how the JPEG is decoded; the defaults are tuned for a faithful copy.
3. Adjust Image Resolution (Optional): Use Image resolution to keep the original pixels, scale by percentage, or set an exact width and height — useful for trimming a large bitmap down before download.
4. Convert and Download: Click "Convert" and save your .bmp. No sign-up, no watermark. The output opens in Windows Photos, Paint, GIMP, Photoshop, and essentially any image viewer.

JPG vs BMP at a Glance

Frequently Asked Questions

Will converting JPG to BMP improve image quality?

No. JPEG compression is lossy and irreversible — the discrete cosine transform discards detail that cannot be reconstructed by any later step. Converting to BMP gives you an uncompressed copy of the image as it currently looks, including any existing JPEG artifacts. It prevents further quality loss if you edit and re-save, but it does not sharpen, denoise, or recover the original.

Why is the BMP file so much bigger than my JPG?

Because BMP stores every pixel uncompressed. A 24-bit bitmap uses 3 bytes per pixel regardless of image content, so a 1-megapixel photo is roughly 3 MB before headers — even if the source JPG was 200 KB. In our testing, typical photos expand 5-20x going from JPG to BMP. If you actually wanted a smaller file, you want the Image Compressor instead, not BMP.

When does it actually make sense to convert JPG to BMP?

When something downstream requires an uncompressed raster: legacy Windows software that predates broad JPEG support, embedded or industrial systems that read raw bitmaps, certain print or signage drivers, or an image-processing script that expects plain pixel arrays. If your goal is general sharing or storage, BMP is the wrong choice — keep the JPG or use PNG.

What bit depth will the output BMP use?

The converter writes a standard true-color bitmap (24 bits per pixel) for typical photos, which matches JPEG's 8-bits-per-channel color. The BMP format itself also supports 1, 4, 8, and 32-bit (alpha) variants, but a photo decoded from JPEG has full color and no transparency, so 24-bit is the faithful representation.

Does BMP follow an official Microsoft specification?

Not a standalone one. Microsoft documented BMP through its Windows SDK and the device-independent bitmap (DIB) header structures rather than a single published spec. Despite that, the format is stable and universally readable. If you later need a compact, openly standardized format, convert the bitmap back with BMP to JPG.