画像をオンラインで圧縮
JPG/PNG/WebPのファイルサイズを品質調整で縮小。無料。
Drop 画像 here or ファイルを選択
What is an 画像 compressor?
An 画像 compressor shrinks the file size of a picture so it loads faster, uploads quicker, and takes up less storage. The trade-off is controlled by quality: a lower quality setting discards more fine detail but produces a much smaller file, while a higher setting keeps the 画像 looking nearly identical to the original. A good rule of thumb is to lower quality step by step until the 画像 still looks great — most photos look fine at 60–80% quality.
This free online 画像 compressor works on JPG, PNG, and WebP files and lets you pick the exact quality with a simple slider. It runs entirely in your browser, so your photos are never uploaded to a server — which makes it safe for private or sensitive 画像. Whether you need smaller 画像 for a website, an email attachment, or a social post, you can reduce 画像 file size in seconds, without installing anything.
使い方 use the 画像 compressor
- Drop one or more 画像 onto the box above, or click browse to select files.
- Drag the quality slider until the preview size looks right — lower quality means a smaller file.
- Click 圧縮 and download each optimized 画像, with the old and new sizes shown side by side.
Frequently asked questions
How much can I compress an 画像?
Reductions of 50–80% are typical for photos, depending on the source 画像 and the quality you choose. The results list shows the exact before and after size for every file.
Does compressing reduce 画像 quality?
Lower quality settings create smaller files but discard some detail, so very low values can soften an 画像. The slider is a preview of that trade-off, and quality down to around 70% is usually hard to tell apart from the original.
Can I compress multiple 画像 at once?
Yes — drop as many JPG, PNG, or WebP files as you need. Every file is compressed with the same quality setting and each result can be downloaded individually.
Are my 画像 uploaded to a server?
No. 圧縮ion happens locally in your browser, so your 画像 never leave your device — nothing is stored, tracked, or sent anywhere.