Convert BMP to WebP Online
Turn BMP files into WebP images that load fast and render in every browser.
Drop your BMP file here
or click to select
How BMP to WebP works
Upload BMP
Drag & drop or click to select your BMP file.
Choose Options
Adjust quality, size, or other output settings if needed.
Download WebP
Click Convert and your WebP file downloads instantly.
About BMP to WebP conversion
BMP is windows bitmap. BMP's total lack of compression makes it painful to store or move. Converting to WebP typically cuts 95% or more off the file with no visible change, which is why BMP archives are among the biggest wins this converter produces.
WebP is the default currency of fast web pages — smaller than JPEG at the same visual quality, smaller than PNG while keeping transparency, and supported by every browser in use. In practice that means a page that loads faster on mobile, a better Largest Contentful Paint score, and less CDN bandwidth — for the same picture. BMP files are 15-40x larger than WebP — a 2 MB WebP becomes a 35 MB BMP, so this is usually the single biggest weight saving available on a page built from them.
Plan for the size: BMP output is roughly width x height x 3 bytes regardless of what the picture contains. Resize before converting if the destination caps file size. WebP tops out at 16383 pixels on either edge, so anything larger is scaled to fit; for the vast majority of web work that ceiling is nowhere near a constraint.
Where WebP comes from
WebP was released by Google in September 2010, built on the intra-frame compression of the VP8 video codec Google acquired with On2 Technologies. Lossless mode (VP8L) and alpha transparency arrived in 2011, animation in 2012. Adoption stalled for most of a decade because Safari refused to ship it, so sites had to serve fallbacks anyway. That ended in September 2020 when Apple enabled WebP in Safari 14, macOS Big Sur and iOS 14 — overnight the format became genuinely universal in browsers. Today Next.js, Cloudflare, Cloudinary, imgix, WordPress and Shopify all emit WebP by default, which is why so many images saved from the web now land on disk as a .webp file.
BMP vs WebP at a glance
| BMP | WebP | |
|---|---|---|
| Compression | None — three uncompressed bytes per pixel | Lossy VP8 or lossless VP8L |
| Transparency | Technically in 32-bit mode; most software ignores it | Full 8-bit alpha in both modes |
| Animation | Not supported | Native animation support |
| Colour depth | 8-bit per channel | 8-bit per channel, sRGB |
| Where it opens | Universal, but rarely the preferred format anywhere | Every current browser; patchy in desktop applications |
| Typical file size | 15-40x larger than webp — a 2 mb webp becomes a 35 mb bmp | The baseline |
Real-world workflow — Developer rebuilding an image-heavy page
- Collect the BMP source files — often hundreds of them in one folder
- Batch-convert to WebP at quality 82 with metadata stripped
- Resize on the way out to the largest size the layout actually displays
- Wire them into a
element with a JPG fallback for legacy clients - Ship it and watch the page-weight and Core Web Vitals numbers move
Recommended conversion settings
| Use case | Settings |
|---|---|
| Photographs and hero images | Quality 80-85 — visually lossless, roughly a third of JPG's weight |
| Logos, icons and line art | Lossless mode — no fuzz around hard edges |
| Thumbnails and list images | Quality 70-75, resized to the display size first |
| Images with transparency | Either mode keeps full 8-bit alpha; lossy is far smaller |
| Archival or re-editable copies | Keep the original — WebP is a delivery format, not a master |
Where will your WebP file open?
| Platform | BMP | WebP |
|---|---|---|
| Chrome / Edge / Firefox | ✓ | ✓ |
| Safari 14+ / iOS 14+ | ✓ | ✓ |
| Windows Photos | ✓ | ✓ |
| macOS Preview & Quick Look | ✓ | ✓ |
| Adobe Photoshop | ✓ | ~ |
| Microsoft Office 2021+ | ✓ | ✓ |
| Email clients (Outlook, Gmail) | ✓ | ✗ |
| Social media uploaders | ✓ | ~ |
| Print & prepress (RIP) | ✓ | ✗ |
When to convert BMP to WebP
BMP is a poor fit for the web — it is either uncompressed, weakly compressed or simply not something browsers render. Converting to WebP produces a file that loads fast, displays everywhere and typically weighs a small fraction of the original.
The most common trigger is an archive that needs to become a website. Folders of scans, exported frames, legacy graphics and instrument captures all convert cleanly, and the size reduction on uncompressed sources is dramatic — often well over 95%.
Keep the originals if they serve as archival masters, particularly lossless scans of documents or artwork. WebP is a delivery format: convert copies for the web and leave the masters alone.
BMP to WebP tips
- Quality 80-85 is the sweet spot for photographs — visually indistinguishable from the original at normal viewing sizes, and roughly a third the weight of the equivalent JPG.
- Use lossless WebP for logos, icons, screenshots and line art. Lossy compression puts visible fuzz around hard edges and text.
- Convert from the highest-resolution BMP you have and let the resize option produce the display size — downscaling before compressing beats compressing then downscaling.
- Strip metadata for web delivery. EXIF blocks can add tens of kilobytes to a file nobody will ever read them from.
- Serve WebP through a
element with a JPG fallback if you still support very old browsers or need images to survive email clients.
Related tools
Formats involved
BMP – Windows Bitmap
WebP – Web Picture Format (Google)
BMP to WebP — frequently asked questions
Related guides & articles
Maybe you wanted something else?
- You want the smallest possible file and can require a modern browser → WebP to AVIF
- You only want to shrink what you already have → Compress WebP
- You need maximum compatibility instead of minimum size → WebP to JPG
- You want to pick a different output format → Image Converter
Related conversions
JPG → WebP
PNG → WebP
HEIC → WebP
PDF → WebP
RAW → WebP
TIFF → WebP
SVG → WebP
GIF → WebP
WebP → WebP
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