How to Convert BMP to WebP on iPhone
BMP is Windows' old uncompressed bitmap format. Drop your BMP file into the converter below and it becomes a WebP straight away, right on your iPhone – nothing is uploaded.
Drop BMP files here or browse
Accepts HEIC, WebP, PNG, JPG, BMP, GIF and SVG · multiple files · nothing is uploaded
Converted on your device. Your photos never leave your browser.
Step by step: Convert BMP to WebP on iPhone
- 1
Open this page in Safari (or Chrome) on your iPhone or iPad.
- 2
Tap the box above. Choose Photo Library to pick from Photos, or Choose File to browse the Files app (iCloud Drive, On My iPhone, Downloads).
- 3
The WebP is made as soon as the file is added. Adjust Quality if you want a smaller file.
- 4
Tap Download. Safari saves the file to Files › Downloads (tap the download arrow in the address bar to find it). To add an image to Photos, open it in Files, tap Share, then Save Image.
What changes when you convert BMP to WebP
- WebP is lossy. The Quality slider starts at 90%, which looks the same as the original for nearly every photo; lower it for a smaller file and the preview shows the new size before you download.
- Check that wherever you're uploading accepts WebP – most websites and browsers do, but some older apps and forms don't.
- BMP files are uncompressed, so the WebP will usually be a fraction of the size.
About BMP and WebP
- BMP is Windows' old uncompressed bitmap format. Files are very large for their size in pixels, and most websites, chat apps and phones won't accept them.
- WebP is Google's image format for websites. It supports lossy and lossless compression, transparency and animation, and is usually 25–35% smaller than an equivalent JPG – but some editing apps, older software and upload forms still reject it.
Tips for iPhone
- There's no app to install from the App Store – the tool runs inside Safari, and the file never leaves your iPhone.
BMP vs WebP
| BMP | WebP | |
|---|---|---|
| Compression | Usually none | Lossy or lossless |
| Transparency | Rarely supported | Yes |
| Animation | No | Yes |
| Best for | Legacy Windows software | Fast-loading images on websites |
| Support | Windows; limited elsewhere | All modern browsers; patchy in older desktop apps |
Frequently asked questions
Will I lose quality converting BMP to WebP?
At the default 90% quality the difference is practically invisible. WebP is lossy, so very low quality settings will show blur or blocky edges.
Can I convert several BMP files at once?
Yes. Add as many as you like; each converts on its own, and Download all saves them in one ZIP.
Are my photos uploaded to a server?
No. The conversion runs in your browser using your device's own processor, so your photos never leave your device. You can even disconnect from the internet once the page has loaded.
Where does the converted file go on my iPhone?
Tap Download. Safari saves the file to Files › Downloads (tap the download arrow in the address bar to find it). To add an image to Photos, open it in Files, tap Share, then Save Image.
Need more options? Open the full Image Converter tool →