Is the image optimizer free to use?

Yes. It’s free and runs in your browser - no signup, no install.

What does ‘optimize for web’ actually do?

It re-encodes the image with settings that keep quality visible while reducing file size: smart quality level, optional modern format (WebP / AVIF), and removal of metadata pages don’t need.

Should I convert images to WebP or AVIF?

WebP gives ~25–35% smaller files than JPG at similar quality and is widely supported. AVIF compresses even better but takes longer to encode. Either is a strong choice for modern sites.

How small should my web images be?

Aim for ≤ 200 KB for hero images, ≤ 150 KB for in-content photos, and ≤ 50 KB for thumbnails. Always resize to the display size before optimizing for the biggest wins.

Can I optimize many images at once?

Yes. Upload multiple files, optimize the batch, and download everything in a single ZIP.

Does the tool upload my images to a server?

Optimization runs in your browser. Files are processed locally and not stored on our servers.

Image Optimizer

Optimize images for faster loading and better performance

Privacy-First • No Data Collection

Image Optimizer

Optimize images for faster loading and better performance. Reduce file sizes while maintaining visual quality with advanced compression algorithms.

ここに画像をドロップ

または下の操作を選択 — ファイルは端末内に留まります

対応形式：JPG、PNG、GIF、WebP、SVG、AVIF、HEIC、BMP、TIFF、ICO • JFIF • 最大 20 ファイル

Ctrl + V で画像を貼り付け

Optimization Settings

Quality: 85%

Higher quality = larger files, lower quality = smaller files

出力フォーマット

サイズ変更モード

プログレッシブ JPEG

Loads images progressively for better perceived performance

メタデータを削除する

Removes EXIF data to reduce file size

画像の最適化について

WebP Format

Modern format with 25-35% better compression than JPEG

Quality Control

Balance between file size and visual quality

プログレッシブ JPEG

Loads images in multiple passes for better UX

Metadata Removal

Removes EXIF data to reduce file size