How to Convert Bmp to WebP Online
BMP stores every pixel raw and uncompressed, so the files are enormous and awkward to share. WebP is the opposite — a modern, highly-compressed format that keeps images looking great at a tiny fraction of the size, with transparency support and universal browser compatibility. This converter turns your BMP bitmaps into WebP in your browser, one file or a whole batch, with a quality slider so you decide the balance.
Add your BMP files
Drag in one image or a whole batch. Each is previewed so you can confirm what you are converting.
Set your quality
Choose a WebP quality level. Higher keeps more detail; lower makes the smallest file.
Convert & download
Hit Convert and see the size drop for each file. Save one, or download the whole batch at once.
Why Convert BMP to WebP
Up to 95% smaller
BMP is uncompressed, so converting to WebP's efficient compression typically slashes file size dramatically while keeping images sharp.
Modern & web-ready
WebP is built for today's web and is supported by every current browser — perfect for putting old bitmaps online.
Transparency support
WebP supports an alpha channel, so any transparency is preserved cleanly in the converted file.
Easy to share & store
Where a BMP is too big to email or upload comfortably, the WebP version slips under limits with room to spare.
Adjustable quality
A quality slider lets you choose exactly how much to compress, from near-lossless down to maximum saving.
Private & instant
Everything runs on your device — nothing uploaded — and even large bitmaps convert in seconds.
Choosing the Right WebP Quality
WebP quality is adjustable. Around 85–92% the result is visually indistinguishable from the original bitmap while still cutting size enormously. Lower settings squeeze the file further when size matters most.
Because BMP is uncompressed, almost any WebP setting produces a massively smaller file, so you rarely need to push quality low. Everything runs locally, so you can convert, check and reconvert instantly.
For pixel-perfect archival copies of a bitmap, keep quality high; for web use, mid settings give the best size-to-look balance.
BMP vs WebP: Key Differences
| Aspect | BMP | WebP |
|---|---|---|
| Compression | None (raw) | Very efficient |
| Typical size | Huge | Tiny |
| Transparency | No | Yes (alpha) |
| Web support | Poor / legacy | Universal (modern) |
| Quality control | Fixed | You choose |
| Best for | Legacy Windows apps | Modern fast web |
Frequently Asked Questions
How do I convert BMP to WebP for free?
Add your BMP files above, pick a quality level, and press Convert. The WebP downloads appear in seconds — free, no signup, no watermark.
How much smaller will the WebP be?
Usually dramatically smaller — often 80–95% — because BMP is uncompressed and WebP is highly efficient. The exact saving shows next to each file after converting.
Does converting to WebP reduce quality?
Only as much as you choose with the slider. At 85–92% it looks identical to the bitmap while being a fraction of the size.
Does WebP keep transparency?
Yes, WebP supports an alpha channel, so any transparent areas in your BMP are preserved.
Are my BMP files uploaded to a server?
No. The conversion runs entirely inside your browser, so your images never leave your device.
Can I convert many BMP files at once?
Yes. Add a whole batch and convert them together, then download each WebP individually or all at once.
Will WebP open everywhere?
WebP is supported by every current browser and most modern software. For older apps, convert to PNG or JPG instead.
Do I need to install anything?
No. It works in any modern browser on Windows, Mac, Android or iPhone with nothing to install.
Is this BMP to WebP converter really free?
Completely free, forever — no account, no watermark, no daily cap and no premium wall.
100% free · No signup · No watermark · Files never leave your browser
Last updated: August 2026 · FlipMyFormat Convert BMP to WebP
Written and maintained by the FlipMyFormat team · Runs entirely in your browser