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How-To Guide

How to Convert BMP to JPG

BMP files are enormous — an uncompressed BMP of a typical photo can be 10-100x larger than an equivalent JPG. Converting BMP to JPG reduces file size dramatically without visible quality loss. The conversion takes seconds and can be done with tools you already have: Microsoft Paint, macOS Preview, or a browser tool.

Open BMP to JPG Converter

Step-by-step instructions

  1. 1

    Method 1: Microsoft Paint (Windows, already installed)

    Open the BMP file in Paint (right-click → Open With → Paint). Click File → Save As → JPEG Picture. Choose a save location and filename. Paint saves as JPEG with its default quality setting (~85%). This is the simplest method on Windows — no download required.

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  2. 2

    Method 2: macOS Preview (Mac, already installed)

    Open the BMP in Preview. Go to File → Export. In the Format dropdown, select JPEG. Drag the Quality slider to your preferred setting (85-90% is ideal for photos). Click Save. Preview converts BMP to JPG in seconds with good quality control.

  3. 3

    Method 3: Browser tool (works on any OS)

    Go to formatdrop.com and use the Image Converter. Drop your BMP file, select JPG as output, and download. The conversion runs entirely in your browser — nothing is uploaded. Ideal for converting from Chromebooks, Linux, or any device where you don't want to install software.

  4. 4

    Method 4: Batch convert multiple BMP files

    For multiple BMPs on Windows: IrfanView (free) supports batch conversion. File → Batch Conversion → add all BMPs → set output format to JPG → Run. On Mac: Automator (built-in) can batch-convert images: create a workflow with 'Change Type of Images' action set to JPEG. FFmpeg on any OS: for %f in (*.bmp) do ffmpeg -i "%f" "%~nf.jpg"

Why convert BMP to JPG?

BMP (Bitmap) is one of the oldest digital image formats, created by Microsoft in the 1980s. It stores image data with minimal or no compression — a 1920×1080 BMP is about 6MB, while an equivalent JPG at high quality is 300-500KB. BMP made sense when processing power was too limited for compression/decompression, but in any modern context it wastes disk space and bandwidth. Common sources of BMP files: Windows screenshots before PNG became the default, old graphic design applications, screen captures from legacy software, medical imaging equipment using old formats. Converting to JPG (photos) or PNG (graphics with flat colours, text) is almost always the right choice.

Your files never leave your device

FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.

Frequently asked questions

Does converting BMP to JPG lose quality?
A small amount of quality is lost since JPG is a lossy format, but at 85%+ quality the difference is invisible. BMP stores every pixel without compression, so the conversion trades perfect fidelity for a 95-99% smaller file. For photos, the trade-off is absolutely worth it. For images with text, sharp edges, or flat colours (like screenshots or logos), convert to PNG instead — PNG is lossless and typically much smaller than BMP for that type of content.
Why are BMP files so large?
BMP files store one value per colour channel per pixel, uncompressed. A 1920×1080 image has 2,073,600 pixels × 3 bytes (RGB) = ~6.2MB of raw data. BMP stores (nearly) all of it. JPG applies discrete cosine transform compression that reduces the same image to 300-600KB. Some BMP files use RLE (run-length encoding), a simple compression that works well for images with large areas of the same colour — but not for photos.
Is BMP still used anywhere?
Yes, in specific contexts: Windows stores system icons and some UI elements as BMP internally. Fax machine software and some medical imaging systems use BMP. The Windows clipboard stores uncompressed BMP data when you copy an image. Some older printers accept BMP. For general use: no modern workflow needs BMP — PNG or JPG is always preferable.
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