Resize BMP Images Online, Free
Resize BMP bitmap files and optionally convert to smaller formats. 100% in your browser — no uploads required.
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How to Resize a BMP File
- Drop your BMP files — Drag and drop or click to select BMP images from your device.
- Set your target size and format — Choose dimensions and optionally convert to JPG, PNG, or WebP for dramatically smaller files.
- Download instantly — Click “Resize” and download your resized files.
Why Resize BMP Images?
BMP files are uncompressed and extremely large. Resizing and converting helps you:
- Massively reduce file size — A typical BMP is 10–50x larger than the equivalent JPG. Resizing and converting can reduce a 6MB BMP to under 100KB.
- Make files web-ready — BMP is not suitable for the web. Convert to WebP or PNG for modern web use.
- Save storage space — Archives of BMP images consume unnecessary disk space. Batch resize and convert to reclaim storage.
About the BMP Format
BMP (Bitmap Image File) is one of the oldest image formats, dating back to Windows 1.0. It stores pixel data with minimal or no compression, resulting in very large files.
- Compression: Usually none (uncompressed)
- Transparency: Limited (32-bit BMP only)
- Colour depth: Up to 32-bit (16.7M colours + alpha)
- Best for: Legacy applications, raw pixel data
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Frequently Asked Questions
- Why are BMP files so large?
- BMP (Bitmap) stores pixel data with little to no compression. A 1920×1080 BMP at 24-bit colour is about 6MB, compared to ~200KB for the same image as JPEG. Resizing and converting to JPG, PNG, or WebP dramatically reduces file size.
- Can I convert BMP to JPG or PNG while resizing?
- Yes. Select your desired output format (JPEG, PNG, or WebP) from the options panel before resizing. This lets you resize and convert in a single step.
- Will I lose quality when resizing a BMP?
- BMP is uncompressed, so the source quality is perfect. When resizing, the quality depends on your output format choice — PNG is lossless, JPG and WebP are lossy but adjustable.
- When should I use BMP?
- BMP is rarely needed today. It's mainly encountered in legacy Windows applications, game development pipelines, or scientific imaging where uncompressed data is required. For web use, convert to JPG, PNG, or WebP.