画像サイズ削減
画像サイズ削減 — 無料オンライン画像圧縮ツール
大きすぎる画像は帯域を無駄にしサイトを遅くします。見た目の品質を落とさずに最大80%画像サイズを削減 — JPEG、PNG、WebPに対応、すべてブラウザ内、アップロード・登録不要。
Why use this reduce image size tool?
Reduce JPEG, PNG and WebP file size
Up to 80% smaller with no visible quality loss
Batch reduce multiple images at once
Quality slider for the perfect size/quality balance
Before/after comparison slider
100% local, private, free, no signup
Frequently Asked Questions
How do I reduce image file size?
Drop your image onto the tool or click to browse. It is reduced instantly in your browser. Use the quality slider and comparison view, then download the smaller image.
How much can I reduce an image?
Typically 50–80% reduction with no visible quality loss. The exact ratio depends on the format and content of the image.
How do I reduce image size without losing quality?
Use quality 70–80 for photos or convert to WebP, which keeps the same visual quality at a much smaller file size. The comparison slider lets you verify the result.
Is reducing image size free?
Yes, completely free with no watermark, signup, or file limits. All processing happens locally in your browser.