Resize WebP Images Online for Free
Resize your WebP files while keeping the format's superior compression and transparency. Set custom dimensions, scale by percentage, or use presets. All processing happens in your browser — your images stay private.
Why Resize WebP with ImageSizr?
WebP delivers 25–35% smaller files than JPEG at comparable visual quality, and it supports transparency that JPEG cannot. ImageSizr.com lets you resize WebP images while preserving both advantages.
WebP is the recommended image format for modern web performance and Core Web Vitals. Resizing your WebP assets to the exact displayed dimensions eliminates unnecessary bytes and improves page load times.
Full alpha-channel transparency is maintained through the resize process. Use the background toggle in the editor to switch between light and dark checkerboard previews and verify transparent areas before downloading.
All Resize Options Available
Enter custom width and height in pixels, centimetres, inches, or millimetres — non-pixel units convert automatically using 96 DPI. Scale by percentage with quick presets at 25%, 50%, and 75%.
Choose from social-media presets for Instagram, Facebook, Twitter/X, and YouTube to hit exact platform dimensions. Or pick a device preset ranging from HD to 4K, plus specific phones, tablets, and laptops.
Enable aspect-ratio lock to maintain proportions when changing one dimension. Disable it for independent width and height control.
Convert or Keep WebP
Export as WebP to keep the best compression and transparency — this is the default output for WebP files. The quality slider controls lossy compression level; higher values produce better fidelity at the cost of larger files.
Need maximum compatibility? Convert to JPEG for older browsers, email clients, or platforms that do not support WebP. Convert to PNG for lossless output when further editing in other tools is planned. Or generate ICO icon bundles with multiple sizes from 16 to 256 px for favicons.
Related Tools
- Resize any image format — the general-purpose resizer for all file types.
- Batch resize multiple images — upload up to 5 WebP files and resize them all with shared settings.
- Crop images to a specific region — select the exact area you want to keep.
- Compress images to reduce file size — lower your WebP file size through quality adjustment.
Browse our image guides and tutorials for more tips on working with WebP files.
Learn More
Frequently Asked Questions
Is ImageSizr free to use?
Yes. ImageSizr is completely free with no account or sign-up required.
Are my images uploaded to a server?
No. All processing happens directly in your browser. Your images never leave your device, so your data stays private.
What is WebP and why use it?
WebP is a modern image format developed by Google that provides superior compression compared to JPEG and PNG. It supports both lossy and lossless compression, as well as transparency. It is the recommended format for web images because it results in smaller file sizes and faster page loads.
Will resizing my WebP lose transparency?
No. When you export as WebP, the alpha channel (transparency) is fully preserved. If you export as JPEG, transparency will be replaced with a background colour because JPEG does not support transparency.
How to resize a WebP image?
1. Upload your WebP file using drag-and-drop, browse, clipboard paste, URL, or cloud storage. 2. In the editor, enter new dimensions, use the percentage slider, or pick a preset. 3. Click Download to save the resized WebP.
Can I resize to exact social-media dimensions?
Yes. Switch to the Social Media resize mode and choose a platform (Instagram, Facebook, Twitter/X, or YouTube), then select the specific preset.
Can I convert WebP to JPG or PNG while resizing?
Yes. Use the Format dropdown in the editor to switch between WebP, JPEG, PNG, or ICO before downloading. This is useful when the destination platform does not accept WebP.
How do I keep the original proportions?
Enable the Lock Aspect Ratio option. When locked, changing one dimension automatically adjusts the other to maintain the original proportions.
What is the maximum file size?
Each file can be up to 10 MB.