WebP Converter
Convert images to WebP or WebP to JPG/PNG. Reduce file size with modern web-optimized format.
Drop image files here
or
Supported formats: JPEG, PNG, WebP, GIF, BMP, HEIC — multiple files supported
What Is WebP?
WebP is a next-generation image format developed by Google in 2010. It delivers the same visual quality as JPEG while reducing file size by 25–35%, making it a powerful tool for speeding up websites.
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.
Frequently Asked Questions
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.
Related Articles
All articlesHow to Batch Convert HEIC Files | Efficiently Convert Hundreds of iPhone Photos to JPG
Learn how to batch convert large numbers of HEIC files to JPG at once. Discover techniques and tips for efficiently converting dozens to hundreds of iPhone photos.
How to Stop iPhone from Saving Photos as HEIC and Use JPG Instead
Learn how to change your iPhone camera settings to save photos in JPG instead of HEIC. Compare the pros and cons of HEIC vs. JPG and find the best setting for your needs.
How to Convert HEIC to JPG | The Easy Way to Convert iPhone Photos
Learn how to convert HEIC photos from your iPhone to JPG. A step-by-step guide to using a free browser-based tool for single and batch HEIC-to-JPG conversion.
HEIC Converter Comparison 2026 | Best Free & Secure Tools Reviewed
A detailed comparison of free HEIC-to-JPG conversion tools. Evaluate five tools based on security, supported formats, and ease of use to find the best fit for your needs.
What Is HEIC? Differences from JPG and Why You Need to Convert
A clear explanation of the HEIC image format used by iPhones. Learn how HEIC compares to JPG, its advantages and disadvantages, and when you need to convert.
How to Open HEIC Files on Windows | Causes & 5 Solutions (2026)
Can't open HEIC files on Windows? Learn why it happens and how to fix it. Covers HEIF extension installation for Windows 11/10, free HEIC-to-JPG conversion, and iPhone settings.
Related Tools
Image Tool List →PDF to JPG Converter
Convert PDF pages to high-quality JPG or PNG images. Adjustable resolution with ZIP download.
PDFPDF to WebP Converter
Convert PDF pages to lightweight WebP images. Higher compression than JPG with excellent quality.
PDFPDF to PNG Converter
Convert PDF pages to lossless PNG images. Transparency support with no quality loss.
ImageJPG to PDF Converter
Convert JPG, PNG, and WebP images to PDF. Combine multiple images into a single PDF file.
ImagePNG to PDF Converter
Convert PNG images to PDF with transparency support. Batch convert and merge into one PDF.
ImageWebP to PDF Converter
Convert WebP images to universally compatible PDF format. Batch convert and merge supported.
ImageImage to PDF Converter
Convert JPG, PNG, WebP, GIF, and BMP images to PDF. Merge multiple images into one document.
ImageImage Compressor
Compress JPEG, PNG, WebP, and HEIC images. Adjust quality, remove Exif data, and convert formats.
ImageImage Resizer
Resize images to exact dimensions. Includes presets for social media covers and ID photos.
ImageHEIC to JPG Converter
Convert iPhone HEIC photos to JPG or PNG. Batch conversion for easy sharing on any platform.
ImagePNG ⇔ JPG Converter
Convert between PNG and JPG formats. Adjust quality and handle transparent backgrounds.
ImageImage Cropper
Crop images with freehand selection, fixed aspect ratios, or social media presets.
ImageImage Blur & Mosaic
Apply mosaic, blur, or black-out effects to hide sensitive areas. Brush and rectangle selection tools.
ImageImage Fill & Paint
Fill areas and paint on images with bucket fill, brush, and eyedropper tools. Copy HEX/RGB color codes.