What quality should I use?

70–80 is a great default. 85–90 preserves fine detail; 60–70 is aggressive but fine for previews or mobile uploads.

Does compression change the format?

This tool always outputs JPEG for maximum size reduction. PNG is not a good target for photographic compression.

Free tool · Compress

Slide the quality control to make photos smaller for email, upload, or storage. Everything runs in your browser.

Files never leave your browser.

Quality75

写真をドロップ、またはファイルを選択

ファイルはブラウザ内で処理されます。

Free tool · Compress

Most compressors upload your photo, compress on a server, and download the result. Doing it locally is faster and keeps your image private.

JPEG quality 70–80 is usually indistinguishable from 100 to the eye, at roughly a fifth of the file size.

iPhoneで編集を続ける

Magic Retouch handles object removal, backgrounds, and enhance — then export a compressed copy in the app.

70–80 is a great default. 85–90 preserves fine detail; 60–70 is aggressive but fine for previews or mobile uploads.
This tool always outputs JPEG for maximum size reduction. PNG is not a good target for photographic compression.
No.