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Convert BMP to JPEG

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BMP (Windows Bitmap) stores pixels as raw, uncompressed bytes — there is no compression at all. A single 1920×1080 BMP occupies roughly 6 MB regardless of whether the image is a white canvas or a complex photograph. That makes BMP the largest common image format by a significant margin. JPEG applies lossy compression, permanently discarding fine spatial detail the eye barely perceives. At quality settings of 85%+, the difference from the uncompressed BMP is imperceptible in photographs. One caveat: 32-bit BMPs can contain an alpha channel, but JPEG has no transparency support — those pixels will become white. The size reduction when converting BMP to JPEG is typically 10–30× — among the most dramatic jumps possible between any two image formats.

When you’d want this conversion

  • Reducing massive BMP files before sharing, emailing, or uploading — BMP has no compression
  • Converting Windows screenshots or system-resource graphics exported as BMP
  • Producing a compact, universally compatible photo from an uncompressed source
  • Drastically reducing file size before attaching to an email or uploading

What to watch for

Transparency is lost — any transparent or semi-transparent pixels are composited onto white in the JPEG output. To keep the transparent background, convert to PNG or WebP instead.
The lossy encoding is permanent — once converted, the discarded detail cannot be recovered. Keep the original BMP as your master file if you may need to edit it again.
From.bmp

BMP

Windows Bitmap

  • Lossless compression
  • Supports transparency
  • Best for: Windows system resources, raw pixel exports from graphics tools
To.jpg

JPEG

Joint Photographic Experts Group

  • Lossy compression
  • No transparency
  • Best for: photographs, social media images, email attachments

More BMP Conversions

Convert BMP to PNG Convert BMP to WebP Convert BMP to AVIF

Convert Other Formats to JPEG

Convert PNG to JPEG Convert WebP to JPEG Convert GIF to JPEG Convert AVIF to JPEG Convert HEIC to JPEG Convert SVG to JPEG

Related Tools

Image to PDF Compress BMP Image Converter

Related Guide

PNG vs JPG vs WebP vs AVIF

How to Use

  1. 1

    Drop your BMP file or click to browse — the output format is already set to JPEG.

  2. 2

    Adjust the quality slider. 85–90% is a good starting point; lower values produce smaller files with more visible compression.

  3. 3

    Click "Convert to JPEG" — conversion runs entirely in your browser.

  4. 4

    Download the JPEG. Note: transparent areas become white.

Frequently Asked Questions

How much smaller will the JPEG be compared to the BMP?

Typically 10–30× smaller at equivalent visual quality. BMP stores every pixel as raw bytes with no compression — any format that applies compression produces a dramatic reduction.

Why is BMP so large in the first place?

BMP stores each pixel as raw bytes with no compression applied. A 24-bit BMP at 1920×1080 requires exactly 1,920 × 1,080 × 3 bytes ≈ 6 MB regardless of image content. Every other common image format applies at least some compression to reduce that footprint.

Does converting BMP to JPEG remove transparency?

Yes. JPEG does not support an alpha channel. Any transparent or semi-transparent pixels are composited onto a white background in the output. If keeping the transparent background is important, convert to PNG or WebP instead — both support full per-pixel alpha.

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