無料画像WebP変換ツール
JPGとPNG画像をブラウザ上で直接WebPに変換。ファイルサイズを削減し、ページ速度を向上させ、ローカル処理でプライバシーを守ります。
Converter Settings
Upload Images
Click or drag images here
JPG · PNG · WebP · GIF · BMP · AVIF · Max 20MB · Up to 50 files
Output Quality
No Results Yet
Upload images and click Convert to WebP to see results here.
How to Convert Images to WebP
Three simple steps to convert your JPG and PNG images to WebP format — entirely in your browser.
01
Upload Images
Select one or more JPG or PNG images from your device. All files are processed locally and never leave your browser.
02
Choose Quality
Pick a quality preset — Small File for maximum compression, Balanced for the best trade-off, or High Quality for minimal loss.
03
Download WebP
Click Convert to WebP and download each file individually or get all converted images packed into a single ZIP file.
Why Convert to WebP?
WebP is the modern image format for the web — smaller files, faster pages, better Core Web Vitals.
100% Local Processing
Your images never leave your browser. No upload, no server storage, no privacy risk.
Fast Batch Conversion
Convert multiple JPG and PNG images to WebP in seconds, processed one by one to keep your browser responsive.
Smaller File Sizes
WebP typically reduces image file size by 25–80% compared to JPG and PNG while maintaining visual quality.
Flexible Downloads
Download each converted image individually or pack all results into a single ZIP file with one click.
Batch Upload
Select up to 50 images at once. The converter processes them sequentially so your browser stays fast and stable.
PNG Transparency Support
Transparent PNG images are converted to WebP while preserving the alpha channel, depending on your browser.
Frequently Asked Questions
Common questions about converting images to WebP.
What is WebP?▾
WebP is a modern image format developed by Google that provides smaller file sizes while maintaining good image quality. It is widely supported by modern browsers and used to improve website loading speed.
Are my images uploaded to a server?▾
No. All conversion happens locally in your browser using the Canvas API. Your images are never sent to any server.
Can I convert multiple images at once?▾
Yes. You can select up to 50 JPG or PNG images and convert them all. They are processed one by one to keep your browser stable.
Does it support PNG transparency?▾
Yes. WebP supports transparency. Transparent PNG images can be converted while preserving the alpha channel, depending on your browser version.
Will EXIF data be preserved?▾
No. Canvas-based conversion removes EXIF metadata. This also helps reduce file size and improves privacy.
Can I download all images at once?▾
Yes. After conversion, click Download All as ZIP to get all converted WebP files packed into a single ZIP archive.
What image formats are supported?▾
JPG, JPEG, and PNG are supported. HEIC, RAW, PSD, TIFF, and other formats are not supported in this version.
Free · No Upload · Private