BMP to WEBP
BMP files are the uncompressed bitmaps that Windows has produced for decades — perfectly lossless, but enormous. A single high-resolution BMP can easily run 20 to 50MB because it stores every pixel with no compression at all, which makes these files slow to upload, painful to email, and completely unsuitable for a website. WebP was built by Google to solve exactly this: it can shrink that same image by 80 to 90 percent while keeping it sharp, using either lossy or lossless compression. FluidConvert converts your BMP images to WebP on secure servers, stripping away the wasted space so you get a modern, web-ready file that still looks the same. It is free, needs no account, and files are encrypted in transit and deleted automatically after conversion.
Drop your file here, or browse
Accepts: image/bmp, .bmp · Max 1GB · always free
Your files are encrypted with TLS and automatically deleted after conversion.
Simply upload your .BMP file and we'll convert it to .WEBP format — fast, free, and secure.
Fast & Free
Convert files up to 1GB completely free. No account, no limits.
Secure
Files are encrypted and automatically deleted after conversion.
High Quality
Industry-leading conversion with no quality loss.
How to Convert BMP to WEBP
Upload Your File
Click the upload area above or drag and drop your .BMP file. We support files up to 1GB, completely free.
Choose Output Format
Select .WEBP as your target format. Adjust any conversion settings if needed.
Download Your File
Click Convert Now and wait a few seconds. Once complete, download your converted file instantly.
About BMP to WEBP
Last updated: August 2026
What is BMP?
BMP (Bitmap Image File) is a raster image format Microsoft introduced with early versions of Windows. It stores image data as an uncompressed grid of pixels, recording the exact color of every single pixel with no compression applied by default. That makes BMP completely lossless and simple for software to read, but it also makes the files very large — file size scales directly with resolution and color depth. BMP supports various bit depths from monochrome up to 24-bit and 32-bit color, and it has long been a default output for Windows screenshots, MS Paint, and older scanning software. It has almost no support on the modern web.
Why convert to WebP?
WebP delivers dramatically smaller files than BMP while keeping images crisp, which is the main reason to convert. You would move a BMP to WebP to publish an image on a website or blog where BMP is not supported by browsers, to cut page load times and improve SEO, to shrink a bulky bitmap so it fits an upload size limit, or simply to store a large library of images without wasting disk space. WebP also supports transparency and animation, and every current browser — Chrome, Firefox, Edge, and Safari — displays it natively, unlike BMP which browsers refuse to render.
What to expect from the conversion
Because BMP is uncompressed, converting to WebP produces an enormous size reduction — typically 80 to 95 percent smaller. If you choose lossless WebP, every pixel is preserved exactly while still shrinking the file substantially. Lossy WebP compresses further and is visually near-identical at normal quality settings, though extreme compression can introduce faint artifacts in gradients. Transparency in a 32-bit BMP carries over to WebP. There is no scanning or OCR involved; this is a straight pixel-to-pixel re-encode, so the image content stays the same while only the storage efficiency changes.
How FluidConvert handles it
Your BMP files are decoded and re-encoded to WebP on secure servers optimized for image processing, so even large bitmaps convert in seconds. Uploads are encrypted in transit and automatically deleted after conversion — we never store, share, or look at your images. The service is completely free and requires no account or software install.
Common reasons to convert BMP to WEBP
- Preparing a large Windows Paint or screenshot BMP for use on a website where BMP files will not display
- Compressing a folder of uncompressed bitmap scans to free up disk space without losing visible detail
- Getting an oversized BMP under a platform's upload size limit for a CMS, forum, or product listing
- Speeding up a web page by replacing heavy BMP graphics with lightweight WebP versions for better load times and SEO
- Converting legacy BMP assets from old software into a modern format that design and photo apps handle easily
Frequently Asked Questions
How much smaller will my BMP be as a WebP?
Usually a great deal smaller — reductions of 80 to 95 percent are common. Because BMP stores every pixel uncompressed, there is a lot of redundancy to remove. A 30MB BMP might become a 1 to 3MB WebP with lossless compression, or even smaller with lossy compression. The exact result depends on image dimensions, color complexity, and the quality setting you choose.
Will converting to WebP reduce image quality?
It depends on the mode. Lossless WebP keeps every pixel identical to the original BMP while still shrinking the file. Lossy WebP throws away some data to compress further; at normal quality settings the difference is imperceptible in everyday viewing, though very aggressive compression can create faint artifacts in smooth gradients. For an exact reproduction, choose lossless.
Does WebP keep the transparency from my BMP?
Yes, if your BMP is 32-bit with an alpha channel, that transparency is preserved in the WebP output. WebP fully supports an alpha channel in both its lossy and lossless modes. Note that many BMP files are 24-bit with no transparency at all, in which case there is simply nothing transparent to carry over.
Can every browser open a WebP file?
Yes. WebP is supported natively by all current major browsers, including Chrome, Firefox, Edge, and Safari, as well as most modern image viewers and design tools. This is a key advantage over BMP, which web browsers do not display at all. If you need to open a WebP on very old software, you may occasionally need to convert it back to a more traditional format.
Why is BMP so much bigger than other image formats to begin with?
Because a standard BMP applies no compression — it records the full color value of every pixel individually. A blank white area takes just as much space as a detailed photo of the same dimensions. Formats like WebP, JPG, and PNG all use compression algorithms to remove redundancy, which is why they are far smaller. Converting to WebP simply introduces that efficient compression.