WebP Converter
Convert images to WebP or WebP to JPG/PNG. Reduce file size with modern web-optimized format.
Drop image files here
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Supported formats: JPEG, PNG, WebP, GIF, BMP, HEIC — multiple files supported
What Is WebP?
WebP is an image format Google released in 2010. It holds the same visual quality as JPEG at 25–35% smaller file size, which is why it turns up in page-speed advice so often.
WebP supports transparency (alpha channel) like PNG and animation like GIF, combining the strengths of multiple formats in one.
As of 2024, over 96% of browsers support WebP. Google PageSpeed Insights and Core Web Vitals both recommend WebP for optimal performance.
How to Use the WebP Converter
- Select the conversion direction: "Image → WebP" or "WebP → JPG/PNG"
- Drag and drop image files or use the file picker to upload them
- Adjust quality and output format, then click "Start Conversion"
- Download files individually or grab them all as a ZIP
Features of sakutto's WebP Converter
- Runs entirely in your browser — your images are never sent to any server
- Two-way conversion: Image → WebP and WebP → JPG/PNG
- Batch-convert multiple files at once
- Fine-tune output with a quality slider and presets
- Download all converted files as a single ZIP archive
- Fully responsive — works on smartphones and tablets
- Free to use, no sign-up required
Use Cases for WebP Conversion
Optimizing images for websites and blogs
Switching to WebP improves page load speed, which can boost Core Web Vitals (LCP) scores and SEO rankings.
E-commerce product images
Convert large product photo libraries to WebP to save storage and bandwidth while maintaining high image quality.
Ensuring compatibility from WebP
Convert WebP images to JPG or PNG so they can be used in applications and services that don't support WebP.
Why WebP Converter on sakutto is safe
Many online tools upload your files to external servers for processing. This tool never sends your image files to any server — everything is processed entirely in your browser.
* Some AI-powered tools require server-side processing. Tools that send data to a server will always notify you beforehand.
| Comparison | Typical online tools | sakutto |
|---|---|---|
| Where data is sent | Uploaded to external servers | Nowhere — processed in your browser |
| Data leak risk | Risk during transfer and server storage | No risk — no network transfer occurs |
| External traffic | File data travels over the internet | No file data appears in network logs |
| Offline use | Not possible (server required) | Works offline after initial load |
How browser-based processing works
- WebAssembly (WASM): Processes image files in your browser at near-native speed. No server communication occurs.
- Web Workers: Runs on a background thread separate from the main thread, so your browser stays responsive during processing.
- After processing, your browser automatically frees the data from memory. No image files remains outside your device.
For IT security teams: How to verify
You can verify that sakutto never sends your image files externally by checking the Network tab in your browser's DevTools while using the tool. You'll see that no requests involving your image files are made. This can also serve as documentation for your IT security team.
WebP Converter FAQ
Is my file sent to a server?
No. All processing happens entirely in your browser. Your images are never uploaded to any external server, so you can safely use this tool with private photos.
What is WebP?
WebP is an image format developed by Google. It produces files 25–35% smaller than JPEG at comparable quality and supports transparency like PNG. Over 96% of modern browsers support WebP.
Will the image quality degrade?
Converting to WebP uses lossy compression, so there is a slight quality reduction — but at 80% quality or above, the difference is virtually invisible. You can adjust the quality slider to find the right balance. Converting WebP to PNG is lossless.
How many files can I convert at once?
The free tier supports up to 5 files at a time, with a maximum of 10 MB per file.
Is transparency preserved?
WebP supports transparency, so PNG → WebP conversion preserves it. When converting WebP → JPG, transparent areas become white. To keep transparency, choose PNG as the output format.
Can I convert animated GIFs?
GIF files are supported, but for animated GIFs only the first frame is converted.
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