Gamma Editor
Adjust image gamma to lift or lower midtones without clipping black or white.
Fill in the form and press “Adjust gamma” to see the result here.
How to use it
- 1Select your image, or drag and drop it onto the upload area.
- 2Adjust the options if you need something other than the defaults.
- 3Press the button. The image is processed on your device - nothing is uploaded.
- 4Download the result, or drop in another file to do it again.
About the Gamma Editor
Gamma applies a curve rather than an offset: values above 1 lift the midtones, values below 1 deepen them, and pure black and pure white are left exactly where they were.
That is why gamma is the right control for an image that reads as too dark overall. Raising brightness instead shifts everything, washing out the blacks and clipping the highlights.
Gamma correction also exists for a technical reason: displays respond to signal non-linearly, and gamma is the compensation for it.
Questions people ask
Is your image uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your image never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.