How to convert WebP to BMP without uploading it
Every "free" online WebP converter you've used uploads your images to a company server, converts them there, and — in several documented cases — keeps a copy or a live download link for days. For personal photos, screenshots and anything you wouldn't post publicly, that's an unnecessary risk. The safer approach is to convert the file where it already is: on your own device.
This tool does exactly that. When you drop a WebP here, your browser:
- Decodes the WebP natively — every modern browser includes a WebP decoder, so there is no decoder file to download and no waiting for a library to load. Animated WebP files decode to their first frame only.
- No rotation is applied — the image is stored the way its pixels are. A WebP file can carry an EXIF chunk, but it is dropped on re-encode, so the BMP carries no camera data at all.
- Re-encodes the pixels as a raw BMP with a pure-JavaScript BMP encoder — BITMAPINFOHEADER, bottom-up rows, at the bit depth you chose. At 32-bit the WebP alpha channel is written into every pixel; at other depths transparency is flattened onto your chosen background colour. Your original file is never modified.
What makes this converter different
The converters that top the results for this search mostly upload your files to a server (101convert, MConverter and iFormat all convert server-side, and iFormat caps free files at 10 MB), and the client-side ones we found cap the output — one offers only 24-bit and 32-bit output and a single file at a time, another ships no settings at all. This page is the only dedicated WebP-to-BMP page we found that combines a batch of 20 files with a ZIP download, the full bit-depth range (1/8/16/24/32-bit), Floyd–Steinberg dithering, hardware and retro destination presets, a background colour for flattened transparency, and a live network-request counter so you can verify the privacy claim yourself. It runs entirely in your browser — there is no server to upload to.
When is BMP the right choice for a WebP?
Almost never for sharing or storage — WebP is far smaller and PNG is lossless and smaller still. BMP earns its place when the destination demands raw pixels: legacy Windows software and GDI tooling, printer utilities, embedded firmware and machine-vision rigs that read uncompressed data, and sprite or retro-game editors that load 1-bit or 8-bit BMPs. If the program you are feeding accepts anything else, use WebP to PNG instead and keep the smaller file.
Honest limitations
No quality recovery
WebP throws away detail when it compresses. A BMP holds the same decoded pixels, uncompressed — it cannot put back what WebP discarded. Blocky artefacts in the WebP stay blocky in the BMP.
BMPs are much larger tha WebPs
Expect roughly 10–30× the size for a 24-bit BMP of a photo, and more at 32-bit. Every file shows its size multiple honestly, and the batch bar shows the total before you download anything.
Animated WebP is first frame only
Browsers decode only the first frame of an animated WebP for web pages. This tool converts that frame and says so plainly on the file card. BMP has no animation at all.
16-bit loses colour depth
16-bit BMP keeps 5 bits per channel — 32,768 colours instead of 16.7 million. Smooth gradients will band. Use it only when the destination insists on 16-bit.
32-bit keeps alpha, other depths flatten
A 32-bit BMP writes the WebP alpha channel, so transparency survives — the advantage over GIF. At 24-bit and below there is no alpha channel: transparent areas are flattened onto the background colour you pick.
Metadata is stripped
Camera metadata (EXIF, including location) is dropped on re-encode. The orientation is applied where the browser exposes it, so the output is stored upright. Greyscale WebPs stay greyscale in the pixels.