WebP Converter
Convert any image to WebP in your browser. You get a lossy WebP at the quality you choose (lossless under More options), keeping transparency. WebP is best for images on websites and in apps. Batch convert any number of files; nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG, PNG, WebP, HEIC, AVIF, GIF, TIFF, SVG, RAW, PSD, JXL, BMP, ICO and more
How to use Convert to WebP
- 1
Drop your images or click to choose them. You can also paste from the clipboard.
- 2
Set the quality. 80 to 85 is visually close to the original for most photos.
- 3
Click Convert. Each file is processed on your device in a background thread.
- 4
Download files one by one or all at once as a ZIP.
Why use Aback Images for convert to webp
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
Fast batch conversion
Several files are converted in parallel worker threads, with per-file progress and cancel.
Content-checked input
Files are identified by their bytes, not their name, so a mislabelled file still converts correctly.
Real control when you want it
Resize, rotate, background colour, metadata and codec options sit under More options.
About Convert to WebP
About WebP
WebP is Google's web image format. It supports lossy and lossless compression, transparency and animation, and is typically 25 to 35 percent smaller than JPEG at the same visual quality.
A WebP is a RIFF file: 'RIFF', a length, 'WEBP', then chunks. A simple lossy file is one VP8 chunk and a lossless one is VP8L; the extended VP8X header announces alpha, animation, ICC, EXIF or XMP chunks.
Strengths: 25-35% smaller than JPEG; Transparency and animation in one format; Supported by every modern browser.
Drawbacks: Some older desktop apps and photo printers cannot open it; Max 16383 px per side.
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Guides
WebP vs JPG: is it time to switch?
How much smaller WebP really is, where it is supported, where it still causes trouble, and how to convert in either direction.
2 min read
Responsive images with srcset and sizes, explained
Serve the right image width to each screen: how srcset and sizes work, which widths to generate, and how picture adds AVIF and WebP with a fallback.
2 min read
How to optimise images for a website, and how large they should be
Pixel sizes for common layouts, sensible file size budgets, the right format for each kind of image, and the loading attributes that make pages feel fast.
2 min read
Frequently asked questions
What quality should I choose for WebP?
80 to 85 is visually close to the original for most photos. Go lower for thumbnails, or switch on Lossless under More options for screenshots and graphics.
Which apps open WebP files?
Every current browser, Windows, macOS, Android, and recent Photoshop, GIMP and Affinity.
Which formats can I convert from?
Anything this site can read: JPG, PNG, WebP, AVIF, HEIC, GIF, SVG, TIFF, BMP, ICO, JPEG XL, PSD, RAW and more. Files are identified by their bytes, so a mislabelled file still converts.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.