Free, no account, no watermark. Your BMP files are turned into WebP inside this browser tab — they are never uploaded to a server.
Nothing leaves your device
No account, no email
Free, and no watermark
Drop your files here
Tap to pick your photos
or
Choose files
Up to 30 files at a time · 60 MB per file
Higher quality means a larger file.
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Why convert BMP to WebP?
The most efficient way to get an old Windows bitmap onto a web page. WebP will typically take a 20 MB BMP down to a few hundred kilobytes, and every current browser can display the result.
WebP is the pragmatic choice for anything served on the web: meaningfully lighter pages and faster loads, without the support gaps AVIF still carries.
How to convert BMP to WebP
Drop your BMP files into the box above, or click to pick them from your device.
Adjust the quality slider if you want a smaller file or a sharper result.
Hit convert. The work happens inside your browser, so it takes a second or two per image.
Download each WebP file, or grab them all in one ZIP.
About the formats
BMP — Windows Bitmap
BMP stores pixels essentially raw, with little or no compression at all. That makes it trivially simple for software to read and absurdly large to keep around: a photo that would be 2 MB as JPG can comfortably run past 20 MB as BMP. It survives mostly inside Windows software, scanner drivers and older industrial tools.
Strengths
Completely lossless, with no compression to undo
A dead-simple format that even very old software can read
No patents and no licensing questions attached
Limitations
Wildly larger than any modern format, often by ten times or more
No meaningful compression whatsoever
Effectively unsupported outside the Windows world
WebP
WebP is Google's attempt to replace both JPEG and PNG with a single format. It handles lossy and lossless, keeps transparency and animation, and typically comes in 25–35% smaller than an equivalent JPEG. Every browser released in the past several years supports it, which is why so much of the web now serves it.
Strengths
25–35% smaller than JPEG at matched quality
Transparency and animation in one format
Supported by every current browser
Limitations
Desktop software from before 2020 often cannot open it
Print shops and photo labs frequently reject it
Its lossy mode smooths fine texture more aggressively than JPEG
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Frequently asked questions
Are my photos uploaded anywhere?
No. The conversion runs entirely in your browser using WebAssembly and the Canvas API. Your images are never sent over the network, never touch a server, and are dropped from memory as soon as you close the tab.
Will I lose quality?
WebP is a lossy format, so some data is discarded. At the default quality of 85% the difference is invisible on screen for most photos. Raise the slider if you plan to print or edit the result.
Is there a limit or a cost?
It is free and there is no account. The only limits are practical: 30 files at a time and 60 MB per file, so that the tab does not run out of memory on a phone.
Can I convert several files at once?
Yes — drop in up to 30 files and they are processed one after another, then downloaded individually or as a single ZIP.
Does it work offline?
Once the page has loaded, yes. The converter itself needs no network connection, so you can drop the connection and keep converting.
Does it work on a phone?
Yes, on iOS and Android. Large batches are slower on a phone because the decoding happens on the device, so stick to smaller groups if things feel sluggish.