BMP to WEBP Converter
Convert BMP files (released 1986 (Microsoft), None (uncompressed) or RLE) to WebP (Lossless + Lossy (your pick), typically 25–35% smaller than equivalent JPEG/PNG). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Should you convert BMP to WEBP? It depends on where the file is headed. WebP (Lossless + Lossy (your pick), typically 25–35% smaller than equivalent JPEG/PNG) is the right call when you need Web production where every kilobyte counts and your destination supports it — All modern browsers (95%+ since 2020). BMP stays the better master when you need Legacy Windows tools, embedded devices, industrial scanners. In our sample set, BMP files came out about 96% smaller as WEBP. This converter runs the whole job locally in your browser, so a 50-file batch is as private as a single image and nothing is uploaded. Below: a side-by-side of both formats, the real trade-offs, and the edge cases — transparency, animation, colour depth — that decide whether BMP → WEBP is a clean win.
Looking to programmatically convert BMP to WEBP?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted output back — no browser, no UI, no rate limits on paid tiers.
Sub-second response on common pairs
Webhook delivery for batch jobs
100+ format pairs supported
BMP vs WEBP — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
BMP
- Year released
- 1986 (Microsoft)
- Compression
- None (uncompressed) or RLE
- Transparency
- Limited (32-bit BMP only)
- Animation
- No
- Browser support
- Universal — read by every browser since the 90s
- Best for
- Legacy Windows tools, embedded devices, industrial scanners
WebP
- Year released
- 2010 (Google)
- Compression
- Lossless + Lossy (your pick)
- Transparency
- Yes (alpha in both modes)
- Animation
- Yes
- Browser support
- All modern browsers (95%+ since 2020)
- Best for
- Web production where every kilobyte counts
Real BMP → WEBP file sizes
We ran a fixed set of sample images through this exact converter so you can see the typical size impact before converting your own files.
| Sample image | BMP size | WEBP size | Change |
|---|---|---|---|
| Photo | 192.1 KB | 23.1 KB | -88% smaller |
| Screenshot / UI | 256.1 KB | 728 B | -100% smaller |
| Logo / transparency | 256.1 KB | 2.8 KB | -99% smaller |
Measured on a 256×256 sample set with this converter on 2026-05-28. Real-world files vary with resolution, colour and content.
Heads up before converting BMP → WEBP
What changes — and what your conversion will cost — based on how BMP and WebP differ.
Chroma subsampling kicks in
BMP stores full-resolution colour channels. WebP's default lossy mode subsamples chroma (typically 4:2:0) — half the colour information thrown away to save bytes. The effect is invisible on photos but visible on sharp text, fine lines, and saturated edges (chromatic aberration around text, halos on logos). For UI screenshots and graphic content, prefer a target without chroma subsampling (PNG, WebP-lossless, AVIF 4:4:4) instead.
Best practices for BMP → WEBP
Concrete settings to pick before you convert BMP to WebP.
- Always preview the WebP output before bulk-downloading — colour shifts, transparency surprises, and quality artifacts show up in the preview before they ship.
- Strip EXIF metadata if file size or privacy matters — camera GPS coordinates, timestamps, and serial numbers travel inside the image bytes by default.
- For photographic content, target a WebP quality between 80 and 85 — that's the sweet spot where most encoders stop showing visible artifacts and the file size curve flattens.
- Verify the alpha channel rendered as expected — premultiplied vs straight alpha and edge halos around antialiased pixels are the most common surprises when going to WebP.
- When converting to WebP (animated), confirm the frame timing matches your source — some encoders default to a fixed 100ms delay per frame instead of preserving the original timing.
- For web WebP delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
When NOT to convert BMP → WEBP
Honest cases where this conversion is the wrong call — pick a different format or keep your BMP source.
Skip if your audience uses legacy browsers
WebP doesn't render on every old browser, email client, or built-in OS viewer. If your traffic includes IE11, legacy Outlook, or older Android WebViews, stay on BMP (or a universal format like JPEG/PNG) — or ship WebP alongside a fallback via the HTML <picture> element.
Skip if the file is bound for print
WebP is a delivery-grade web format. Print pipelines (offset, large-format, packaging) expect TIFF, PDF, or high-bit-depth PNG with embedded ICC profiles and a CMYK option. Converting BMP to WebP for a print job will likely fail prepress checks — keep the original or convert to a print-friendly format instead.
The importance of a good image conversion
Why getting BMP → WEBP right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
Convert BMP to other formats