How it works, what you get, limits
できること
Drop JPEG, PNG or WebP files to compress them. Batch a few at once and compare with the slider.
使い方
Add images, then check original vs compressed size. Open one to compare. ID-photo size in KB is under more options.
得られるもの
Download each file or a ZIP. The originals stay on your device. If a target KB cannot be reached, the page says the smallest size it can hit.
パラメータと比較
Smart quality, keep format, no resize by default. PNG can keep transparency. Convert to JPEG / WebP / PNG. Target KB binary-searches quality, then shrinks edges. GPS is stripped by default. Max 20 files.
The slider shows blocking on skies and skin if you crush quality too far. Judge from the preview.
制限
HEIC the browser cannot decode will fail — export JPEG first. Huge images may run out of memory. Use the frame tool for animated GIF.
FAQ
Are images uploaded?
No. Compression runs in your browser. Files do not leave this device.
Can I hit a target KB?
Yes, under more options. If still over, the long edge is reduced.
Does HEIC work?
If the browser cannot decode HEIC it fails. Export JPEG from the OS first.