100% Free In-browser Transparency preserved

Compress WebP Images Free

Reduce WebP file size with adjustable quality. Maintain transparency. Instant in-browser processing — your images never leave your device.

Drop WebP images here or click to browse

WebP • Transparency supported • Batch compress supported

Accepts: .WEBP
Output: .WEBP
75%
px
Lower quality = smaller file size. 75% is recommended for most photos.
Never uploaded·How to use this tool
0 files
Related tools: Compress Image Compress JPEG Compress PNG MB to KB Resize to 20KB

How it works

Compress WebP images in 3 steps

1

Upload your WebP

Drop your .webp files onto the tool. Transparent WebP files are fully supported. Add multiple files for batch processing.

2

Set quality level

Adjust the quality slider to control the trade-off between file size and visual quality. 75% is the recommended starting point.

3

Download compressed

Download your compressed WebP files individually or all at once as a ZIP archive.

FAQ

Frequently asked questions

Yes. WebP is one of the few formats that supports both lossy compression and transparency (alpha channel) simultaneously. When you compress a transparent WebP image, the alpha channel is preserved in the output. Transparent areas will remain transparent at any quality setting.

WebP files are already quite efficient, but re-encoding at a lower quality can reduce file size further. A WebP at 75% quality is typically 30–60% smaller than the same WebP at 95% quality. The actual reduction depends on the image content — photos with lots of detail compress more than flat-color graphics.

No. All compression is done locally in your browser using the HTML5 Canvas API. Your images are never transmitted over the network. This means instant processing, no file size limits from server constraints, and complete privacy.

For photographs and images with many colors, 70–80% quality produces a good balance of file size and visual quality. For icons, logos, and graphics with flat colors, you may need a higher quality (80–90%) to avoid visible compression artifacts around sharp edges. Start at 75% and adjust based on the preview.

Yes. Select multiple .webp files at once or drag and drop a batch onto the tool. All files will be compressed using the same quality and max-width settings. When processing is complete, a Download All (ZIP) button appears so you can download everything in a single archive.

Everything you need to know about compressing WebP images

WebP is a modern image format developed by Google that provides superior compression for images on the web. It supports both lossy and lossless compression, as well as transparency, making it a versatile replacement for both JPEG and PNG. As of 2024, all major browsers support WebP, and it is increasingly the default format for images served on the web.

Why compress WebP files?

Even though WebP is already more efficient than JPEG and PNG, files exported at high quality settings (90–100%) can still be unnecessarily large for web use. Re-compressing WebP images at 70–80% quality can cut file sizes significantly without any perceptible quality loss in typical web display sizes. Smaller WebP files mean faster page loads and better Core Web Vitals scores.

WebP lossy vs lossless compression

WebP supports two compression modes. Lossless WebP stores every pixel exactly, similar to PNG — ideal for screenshots, logos, and pixel art where perfect fidelity is required. Lossy WebP uses a quality factor (like JPEG) to discard imperceptible detail, producing much smaller files. Our compressor uses lossy WebP with your chosen quality setting, which is the right choice for photographs and most web images.

Does WebP support transparency?

Yes, and this is one of WebP's key advantages over JPEG. Both lossy and lossless WebP support full alpha-channel transparency, making it a drop-in replacement for PNG with transparency. A transparent WebP is typically 25–35% smaller than the equivalent PNG, making it the preferred format for logos and icons on modern websites.

Why use JustDownSize to compress WebP?

JustDownSize processes WebP compression entirely in your browser using the native Canvas API with no server uploads and no account required. The quality slider gives you direct control over the compression level, and the max-width setting lets you resize oversized images in the same step. Everything is instant, private, and free.