What quality should I use?

70% to 80% is a good starting point — at that level the difference is usually invisible while the file drops by more than half. Below it, hair, skin gradients and smooth skies go first, so pick a detailed image to judge on rather than a flat one.

Can it hit an exact size like 200KB?

Not in bulk — here you set quality, not size. For one image, use "Fit to size" in the single-image export dialog: type a number (200 is read as 200KB) and it binary-searches the quality to find the highest one that stays under your target.

Is it free? Are my images uploaded?

Free, no sign-up, no usage limit. Nothing is uploaded either — it all runs in your own browser.

Compress images in bulk

Quality 30%–100%, no file cap. Local processing, nothing uploaded.

Use it online now

Pick a pile of images, choose JPG or WebP, pull the quality down — done.

Compression is trading image quality for file size, so it takes a lossy format: JPG or WebP. The quality slider runs 30% to 100%, default 92%. The rule of thumb is 70%–80% — at that level the difference is usually invisible while the file drops by more than half; below it you start to see damage, and what breaks first is hair, skin gradients and smooth skies, so judge on a detailed image rather than a flat one. PNG has no quality slider because it is lossless — there is no setting to give. To shrink PNGs, switch the target format to WebP: it keeps transparency too and is usually far smaller at the same perceived quality. There is no cap on the number of files. To hit an exact size on one image — precisely 200KB, say — use "Fit to size" in the single-image export dialog, which binary-searches the quality for you. It all runs in your own browser; the images are never uploaded.

Key features

Quality 30%–100%

Around 70%–80% usually looks identical while the file drops by more than half.

PNG shrinks via WebP

PNG is lossless with no quality setting; WebP keeps transparency and is far smaller.

No cap on files

Compress as many as you pick — the limit is your computer, not a gate we set.

Runs locally

The images are never uploaded. Close the tab and nothing is left.

How to use

1
Pick the images

Select hundreds at once — there is no limit on the count.
2
Choose JPG or WebP

Pick WebP to keep transparency. Choosing PNG shows no quality slider.
3
Pull the quality down

Start at 80% and work down, judging on an image with hair or a gradient in it.
4
Collect them from Downloads

They arrive one by one; your browser may first ask whether to allow multiple downloads.

FAQ

What quality should I use?: 70% to 80% is a good starting point — at that level the difference is usually invisible while the file drops by more than half. Below it, hair, skin gradients and smooth skies go first, so pick a detailed image to judge on rather than a flat one.
Can PNGs be compressed?: Choosing PNG as the target shows no quality slider, because PNG is lossless and has no setting to give. To shrink PNGs, switch the target format to WebP — it keeps transparency too and is usually far smaller at the same perceived quality.
Can it hit an exact size like 200KB?: Not in bulk — here you set quality, not size. For one image, use "Fit to size" in the single-image export dialog: type a number (200 is read as 200KB) and it binary-searches the quality to find the highest one that stays under your target.
Is it free? Are my images uploaded?: Free, no sign-up, no usage limit. Nothing is uploaded either — it all runs in your own browser.

Try Compress images in bulk now

Runs fully in your browser · no install · no signup · images never uploaded

Use it online now