BMP to WEBP Converter

About BMP to WEBP

Converts a BMP to WebP with a quality slider, turning an uncompressed bitmap into one of the smallest web-ready formats. WebP handles lossy photographs and supports transparency, and every current browser can display it. This is the right target when you are optimizing pictures for a website and are starting from raw bitmaps.

How to use it

1. Drop a BMP file on the drop zone, or click it to browse for a .bmp file.
2. Glance at the Source preview and the size printed in the hint to confirm the file.
3. Set the Quality slider. It spans 10 to 100 and defaults to 85, with Smaller file on the left and Better quality on the right.
4. Press Convert to WebP and wait for the Output panel.
5. Press Download WebP, or use the copy button next to it to copy the result as a data URL.

A 640 x 480 bitmap for a web page

A 24-bit BMP, 640 x 480 pixels: 1,920 bytes per row x 480 + 54 = 921,654 bytes, converted at the default quality of 85.

A 640 x 480 WebP encoded at quality 0.85. Because the source is uncompressed, the WebP is a small fraction of 921,654 bytes.

When to use it

• Preparing hero images and thumbnails for a site from scanned or captured bitmaps.
• Cutting page weight when a design team delivers BMP assets.
• Comparing how much smaller WebP gets than PNG for the same picture by converting it both ways.
• Embedding a compact image as a data URL using the copy button.

Questions about BMP to WEBP

Is WebP lossy or lossless in this tool?

The browser's encoder is used in its quality-driven mode, so values below 100 are lossy. Near the top of the slider the difference from the bitmap becomes very hard to see.

Which browsers can open the result?

Chrome, Edge, Firefox and Safari 14 or later all display WebP. Some very old email clients and desktop programs still do not, so keep a PNG or JPG version for those.

Does WebP keep an alpha channel from the bitmap?

The format supports transparency, and the tool does not add a background for WebP. Most BMPs have no alpha data to begin with, so expect a fully opaque image.

The output looks the same as the input on screen. Did it work?

Yes. The visible result should match the bitmap closely at high quality. Check the saved file's size in your file manager to see the actual saving.

Related tools

• WEBP to BMPConvert WEBP images to BMP format in your browser — no upload required.
• PNG to BMPEasily convert PNG images to BMP with this easy-to-use converter.
• PNG to WEBPEasily convert PNG images to WEBP with this easy-to-use converter.
• JPG to BMPEasily convert JPG images to BMP with this easy-to-use converter.
• JPG to WEBPEasily convert JPG images to WEBP with this easy-to-use converter.
• BMP to ICOConvert BMP images to ICO format