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BMP to JPG Converter

Shrink an uncompressed BMP by 80-95% into a JPG you can actually email.

Drop BMP files here
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Up to 50 MB per file. Sign up free to convert files up to 100 MB.

What to expect when converting BMP to JPG

Typical file-size change
80–95% smaller
Example

A 20 MB uncompressed BMP typically becomes 1 – 3 MB as JPG.

Quality: Lossy compression, at quality 85+, the visual difference from the BMP source is imperceptible.

Best for: sharing legacy Windows images, embedding in documents, web upload.

Avoid when: archival or further editing, BMP keeps every original pixel.

Tip: BMP files are usually uncompressed, which is why they're so much larger than JPG. Most BMPs in the wild are screenshots or scans that compress very well as JPG.

BMP to JPG: eliminating uncompressed overhead

BMP (Bitmap) stores raw pixel data with zero compression, a 1920×1080 image at 24-bit color occupies 5.9 MB regardless of content. JPG's DCT compression reduces this to 200-800 KB depending on image complexity and quality setting. The conversion reads the raw pixel array from the BMP, applies chroma subsampling (reducing color resolution to 4:2:0), performs the discrete cosine transform on 8×8 pixel blocks, quantizes the coefficients, and Huffman-encodes the result.

Convert BMP to JPG whenever you have legacy BMP files taking up excessive disk space. BMPs are common outputs from older Windows applications, screenshots on legacy systems, and medical or industrial imaging equipment. JPG reduces storage requirements by 90%+ with minimal visible quality loss for photographic content.

BMP vs JPG: Side-by-side

Technical comparison of the two formats, useful for deciding which to use, or for confirming what changes during conversion.

Property BMP JPG
Full name Bitmap JPEG (Joint Photographic Experts Group)
Year introduced 1990 1992
Developer / standard body Microsoft JPEG Committee
MIME type image/bmp image/jpeg
File extension .bmp .jpg / .jpeg
Compression Uncompressed (typically) Lossy (DCT-based)
Color / data depth 1 to 32-bit 24-bit truecolor
Max dimensions / size 32,767 × 32,767 px 65,535 × 65,535 px
Transparency Yes No
Animation No No
Standard / specification Microsoft Windows ISO/IEC 10918
Best for Legacy Windows applications, raw pixel data Photos, web images, email attachments

Frequently asked questions

Can I convert BMP to JPG without losing quality?

JPG is a lossy raster format. Converting to a lossless target such as PNG, TIFF or BMP preserves every pixel exactly. Converting to a lossy one such as JPG or WebP re-encodes the image, and iFormat uses a high default quality so the difference is invisible at normal viewing size. For the sharpest result, always convert from the highest-quality source you have.

What is BMP?

BMP is an uncompressed Windows bitmap, typically used for raw pixel data with no compression. Converting it to JPG produces a file that opens on systems without BMP support.

BMP vs JPG - which format should I use?

BMP is an uncompressed Windows bitmap best for raw pixel data with no compression. JPG is a lossy raster format best for photos and web images where small size matters. Use JPG when a website, form, or app requires it, or when you need a small file size and near-universal compatibility.

How do I open BMP files?

On Windows: Photos, or Paint. On a Mac: Preview. Opens everywhere but is uncompressed, so files are enormous for what they contain.

BMP vs JPG - which format should I use?

BMP is an uncompressed Windows bitmap best for raw pixel data with no compression. JPG is a lossy raster format best for photos and web images where small size matters. Use JPG when a website, form, or app requires it, or when you need a small file size and near-universal compatibility.

Why is my BMP file so much larger than a JPG of the same image?

BMP stores every pixel uncompressed (typically 3 bytes per pixel for color). JPG uses sophisticated lossy compression that's tuned for natural images. The 80–95% size reduction comes from JPG discarding visual information that the human eye can't notice.

When should I keep BMP instead of converting to JPG?

Rarely. BMP made sense in the Windows-98 era when storage was expensive and JPG wasn't universal. Today, PNG (lossless, smaller, supports transparency) and JPG (much smaller for photos) are strictly better choices.

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Image guides and fixes

Best Image Format for Email Attachments: JPG, PNG, or Something Else? Not every image format works in every email client. JPG is the safest bet for photos, PNG for screenshots. Here is when to use each and what to avoid. How to Compress WebP Images: Quality Settings and Best Practices WebP is already smaller than JPG and PNG, but you can compress it further. Here are the optimal quality settings and when to use lossy vs lossless WebP. AVIF vs WebP vs JPEG XL - Which Next-Gen Image Format Should You Use? AVIF, WebP, and JPEG XL all promise smaller files and better quality than JPEG. This guide compares them on compression, browser support, features, and real-world use cases. Free TinyPNG alternatives - 2026 comparison The best TinyPNG alternatives in 2026. Compress PNG, JPG, and WebP without the 20-file batch limit or the 5 MB file cap. Compared honestly, ranked by output quality.
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