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BMP
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WEBP

BMP to WebP Converter — Free, Online, No Upload

Export a BMP from your legacy app and make it web-ready instantly — WebP gives you 90% smaller files than the raw BMP.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select BMP files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

Free image outputs include a repeating formatdrop.com watermark · Remove with Pro

✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?WEBP → BMP

How to convert BMP to WEBP online

  1. 1

    Drop your BMP file

    Drag your Bitmap Image File file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your WEBP

    Click Download to save the Web Picture Format file.

BMP vs WEBP: format overview

BMP

Bitmap Image File

Microsoft · 1987

Compression
none
Transparency
No
  • ✓ No compression — original pixel data preserved
  • ✓ Universal Windows support
  • ✗ No compression = massive files
WEBP

Web Picture Format

Google (On2 Technologies acquisition) · 2010

Compression
hybrid
Color depth
8-bit
Transparency
Yes
  • ✓ 30% smaller than JPEG, 26% smaller than PNG
  • ✓ Supports both lossy and lossless

BMP magic bytes: 42 4D

WEBP magic bytes: 52 49 46 46 xx xx xx xx 57 45 42 50

Why convert BMP to WEBP?

BMP files are large by design — they store every pixel without compression. This makes BMP reliable for local applications and software compatibility, but impractical for anything involving web delivery or bandwidth-conscious storage. A 15 MB BMP screenshot or graphic is simply too large to handle efficiently on the web.

WebP is Google's image format designed specifically for web use, and it excels at reducing file sizes. Converting BMP to WebP typically reduces file size by 70–90% while maintaining excellent visual quality. WebP is supported in all modern browsers and is accepted by most web platforms, CMS systems like WordPress, and tools like Figma and Canva. Google PageSpeed Insights recommends WebP over older formats for web performance.

Because BMP is uncompressed, the WebP encoder starts from a perfect, lossless source — no pre-existing compression artifacts to work around. For graphics with flat colors and sharp edges (screenshots, diagrams, UI mockups), WebP's lossless mode preserves the exact pixels at a fraction of BMP's file size. For photographic BMP files, lossy WebP at high quality settings achieves similar results to lossless at much smaller file sizes. Transparency in BMP (32-bit BMP with alpha) converts cleanly to WebP's alpha channel support.

Quality & file size: BMP to WEBP

Typical sizes (12MP photo): BMP 35–40 MB → WEBP 1–3 MB.

On the free tier, WEBP output has a repeating formatdrop.com watermark; Pro output doesn't.

WEBP output is encoded at quality 85 — a small file with no visible difference for most photos.

Frequently asked questions

My design software only exports BMP — can I use it on a website after converting?
Absolutely. Converting BMP to WebP makes it web-ready: all major browsers support WebP, and the file size will be a fraction of the BMP's size, dramatically improving page load speed.
Does WebP support the transparency that BMP lacks?
BMP does support 32-bit colour with alpha. If your BMP has transparency, WebP will preserve it. If your BMP is a standard 24-bit file, transparency is not applicable.

Your BMP file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works