Adjust colours and apply filters to PNG images

Fix a dull photo, match a batch to one look, go black and white, invert a diagram for dark mode. Every image gets the same treatment, so a series stays consistent.

PNG

drop it. goon.

drop your images here, or paste them. you know you want to.

stays in your browser. nothing leaves. nothing is watching.

how to adjust colours and apply filters to PNG images

  1. 1Drop your images.
  2. 2Pick a look and move the sliders.
  3. 3press goon and download.

questions

Can I preview before running?
The editor shows every slider live on one image. Find the numbers there, then apply them here to the whole batch.
Does grayscale reduce the file size?
PNG: often yes, it is stored as a grey image when every pixel is grey. JPG: a little.
Is anything uploaded?
No. The whole tool runs in your browser tab. Files never leave your device.
Is it really private?
Yes. The tool is code that runs in your browser tab. Your PNGs are never sent to a server. Open the network tab and check. Nobody is watching. Goon in peace.

One setting, a whole batch

Every image in the batch gets the same treatment, which is exactly what a product series, a set of screenshots for documentation or a photo dump for a blog post needs. Dial in the look on one image in the editor, where every slider is live, then apply the same numbers here to all of them.

The maths, briefly

Exposure and contrast are applied as a tone curve, saturation blends towards luminance, hue rotates in a luminance-preserving space, sharpen is an unsharp mask and blur a three-pass box filter. The looks are presets of those same controls, so "vintage" is simply sepia plus a little less contrast and a vignette.

more PNG tools. you know you want to.

all PNG tools →