WebP to BMP

WebP to BMP is a free tool that converts a WebP image into a BMP bitmap file entirely within your browser.

How do I convert WebP to BMP?

Provide the WebP file, allow the browser to convert it, then save the resulting BMP file.

1. Choose the WebP image you want to convert.
2. Wait while the WebP-to-BMP conversion is completed locally in your browser.
3. Save the BMP and open it in the application where you intend to use it.

The source image is never uploaded to a server. This matters when the file contains private material, such as an internal design, an unpublished product photograph or a screenshot containing personal information.

Check the saved BMP against the source WebP before deleting the original. In particular, inspect transparent areas and animated files because BMP does not handle those features in the same practical way as WebP.

What changes when WebP is converted to BMP?

The compressed WebP image is decoded into pixels and written as a BMP file, usually with a substantial increase in file size.

• Compression: WebP supports both lossy and lossless compression. BMP files are commonly stored as uncompressed pixel data, although the specification also includes limited compression methods such as run-length encoding.
• Transparency: WebP supports an alpha channel. Some BMP variants can store alpha information, but support differs between applications, and the tool does not promise that WebP transparency will be preserved. Do not rely on BMP for transparent web graphics without checking the output.
• Animation: WebP can contain multiple animated frames. An ordinary BMP contains one raster image rather than an animation. The converter does not specify how it selects or handles frames, so inspect the result if the source WebP moves.
• Image quality: Converting a lossless WebP can retain the decoded pixel appearance, subject to colour and transparency handling. Converting a lossy WebP to BMP does not restore detail removed during the original WebP compression.
• Support: WebP is widely supported by Chrome, Edge, Firefox and Safari and is suitable for web delivery. BMP is closely associated with Windows and is supported by many desktop image applications, but it is rarely a sensible format for a public website.

The file extension also changes from .webp to .bmp. Merely renaming the source file does not perform a conversion because the encoded image data remains WebP.

When should I convert WebP to BMP?

Convert WebP to BMP when a particular application, device or older workflow requires bitmap input and cannot read WebP directly.

Typical cases include importing an image into legacy Windows software, preparing a simple bitmap for an older device, or supplying pixel data to a program that accepts BMP but has no WebP decoder. BMP can also be useful for inspecting uncompressed RGB pixel data during image-processing development.

It usually does not make sense to convert images for use on a website. WebP normally uses much less storage and network bandwidth, while BMP provides no practical web benefit. If the destination accepts JPEG and the image is a photograph, WebP to JPG is usually a more suitable route. For a Windows favicon, use WebP to ICO instead because ICO can contain the icon sizes expected by browsers and desktop software.

File size and quality expectations

A BMP will typically be much larger than its WebP source because WebP compression is designed to reduce file size, whereas a conventional BMP records colour values for each pixel with little or no compression.

As a rough calculation, a 1,600 × 900 image stored as 24-bit RGB needs about 4.32 MB for its pixel data, plus a small header and any row padding. A 32-bit representation needs about 5.76 MB. The size of the original WebP cannot be inferred from its dimensions alone because it depends on image content, compression mode and quality settings.

For example, the BMP visual result cannot be better than the decoded WebP source: a WebP photograph that already contains blur or compression artefacts will produce a BMP containing those same visible defects. The BMP may be larger, but the extra bytes do not recreate lost detail.

Very large images can require considerable browser memory because the converter must decode the compressed WebP file and construct the BMP output. A damaged file, an empty file or a file with a misleading .webp extension may not decode successfully.

Frequently asked questions

Can I convert the BMP back to WebP later?

Yes, provided you have access to a BMP-to-WebP encoder. Choosing lossy WebP during that later conversion may remove further image detail, while lossless WebP avoids a new lossy compression stage but may create a larger WebP file.

Will image metadata be retained?

Do not assume that EXIF details, comments, colour profiles or other metadata will survive. The tool's stated function is image-format conversion and it does not promise metadata preservation, so keep the original file if those records matter.

Can Microsoft Paint open the converted file?

Microsoft Paint and many other Windows image applications support standard BMP files. Older or specialist software may accept only particular colour depths or BMP header versions, so test the output in the actual target application.

Is browser-based conversion safe for confidential images?

The conversion itself takes place entirely in your browser, and the image is never uploaded to a server. You should still avoid saving the converted BMP output to a shared folder, synchronised drive or public computer where another person or service could access it.

Final checks

• Confirm that the BMP opens in the intended application rather than relying on a preview alone.
• Inspect edges that were transparent in the WebP and check any animated source carefully.
• Compare the BMP's dimensions and visible colours with the source WebP.
• Keep the WebP if you may need its smaller size, transparency, animation or original metadata later.