Pure frontend local processing · Images never uploaded · Quality control · Resize · Batch compress · Real-time preview
Zero Dependencies · Works OfflineWhat Can the Online WebP Image Compressor Do?
WebP is Google's modern image format, delivering files 25-35% smaller than JPEG and PNG at the same quality. Online WebP Image Compressor runs entirely in your browser — no uploads, no signup. Convert common image formats to compressed WebP, fine-tune compression with the quality slider, resize to a target width, and process multiple files in one batch.
Key Features
- Lossy / Lossless Compress: Lossy mode tunes quality from 1-100 for maximum savings; lossless mode preserves quality perfectly
- Resize: Set a maximum width to downscale images and further reduce file size
- Batch Processing: Upload multiple images, compress them all at once, and download results
- Real-time Preview: Compare original and compressed images side by side with size and ratio
- Drag & Drop Upload: Drop files onto the page or click to select them
How to Use
1. Upload images: Drag one or more image files to the upload area, or click to select files. WebP, PNG, JPEG, BMP and GIF are supported.
2. Adjust parameters: Choose lossy mode for photos (quality 70-85 recommended) or lossless mode for graphics and screenshots. Set a maximum width to resize.
3. Start compress: Click "Start Compress" — every image is processed locally in your browser. Each result shows original size, compressed size and reduction.
4. Preview and download: Compare the before/after preview, then download files individually or all at once.
Use Cases
1. Web Performance Optimization
Page load speed directly affects user experience and SEO. Converting in-page JPEG/PNG images to WebP can cut file size by 25-50% and shorten first-load time.
2. Compressing Photos for Sharing
Platforms often limit image size. Compress large photos locally before uploading while keeping quality, and batch-process multiple images at once.
3. Optimizing Images in Documents
Compress images used in web articles to WebP to reduce bandwidth and make pages open faster.
Technical Background
WebP: WebP is based on VP8 video encoding. Lossy compression uses predictive encoding and entropy encoding; lossless compression uses spatial prediction and entropy encoding. Both modes support an alpha transparency channel, and WebP also supports animation (replacing GIF) at roughly one-third the size.
FAQ
Will WebP compression reduce image quality?
In lossy mode quality decreases slightly, but WebP is 25-35% smaller than JPEG at equal quality. Adjust the quality slider — 70-85 is a good range. Lossless mode never reduces quality.
Which image formats can I compress?
The tool accepts WebP, PNG, JPEG/JPG, BMP and GIF images and outputs compressed WebP files. Images are decoded and re-encoded locally in your browser.
Is my image data safe?
Completely safe. All processing happens locally in your browser — nothing is uploaded to any server. Your data stays on your device and is gone when you close the page.
Why is my compressed image still large?
If the original is already highly compressed (e.g., low-quality JPEG), re-encoding to WebP may not shrink it much. Also, lossless WebP files are usually larger than lossy JPEG. Use lossy mode for photos and lossless for graphics or screenshots.
Can I compress multiple images at once?
Yes. Select or drag multiple image files — the tool compresses all of them with the current settings, shows each result in the list, and lets you download them individually or all together.
Is WebP well supported by browsers?
WebP is supported by Chrome, Firefox, Edge and Safari (iOS 14+/macOS Big Sur+), covering over 97% of browsers. For the few that don't support it, use the <picture> element with a JPEG/PNG fallback.