Question 1

Does this upload my images anywhere?

Accepted Answer

No. Compression runs entirely in your browser using the Canvas API — your files never leave your device.

Question 2

What quality setting should I use?

Accepted Answer

75% is a great default for JPG and WebP — visually identical to the original for most photos at roughly a third of the size. Drop to 60% for aggressive size cuts.

Question 3

Why doesn't quality change the PNG file size much?

Accepted Answer

PNG is lossless, so the quality slider doesn't apply. To shrink PNGs significantly, use the max-dimension slider to resize them, or convert to JPG/WebP first.

Question 4

Is there a file size or quantity limit?

Accepted Answer

No limit — drop dozens of images at once. Very large images (>50MP) may be slow on low-end devices since processing runs locally.

Image Compressor

Frequently asked questions

Related image & media

JPG to PNG

PNG to JPG

JPG to WebP