Gamma Image
Adjust the midtone curve with a gamma slider (0.1–3.0) — lighten or darken midtones without blowing out highlights or crushing shadows. Free, private, and instant — processed in your browser, never uploaded.
Upload an image
Drop image here
or click to browse
Options
Midtone curve adjustment
Gamma < 1 lightens midtones, gamma > 1 darkens them — without clipping the highlights or shadows the way a brightness slider would.
100% private
Your image is processed entirely in your browser using the Canvas API — nothing is ever uploaded to a server.
Free and unlimited
No signup, no watermark, no daily limit. Process as many images as you like.
How to apply gamma correction to an image
Upload your image
Drag and drop or click to select a JPG, PNG, or WebP image.
Set the gamma
Drag below 1.0 to lighten midtones or above 1.0 to darken them. 1.0 is neutral.
Pick a format
Choose PNG to keep transparency or JPG for the smallest file size.
Download
Click download to save the gamma-corrected image to your device.
Frequently asked questions
What does gamma correction do to an image?
Gamma correction applies a power-curve to each pixel: out = 255 * (in/255)^(1/gamma). Values below 1 lighten midtones and values above 1 darken them without clipping highlights or shadows.
Is the gamma tool free?
Yes — completely free and unlimited. No signup, no account, no watermark, no daily limit.
How is gamma different from brightness?
Brightness adds or subtracts a flat amount from every pixel, which can clip very bright or very dark areas. Gamma applies a non-linear curve that preserves detail across the full tonal range.
Are my files uploaded to a server?
No. The correction happens entirely in your browser on your device. Your image never leaves your computer, so it stays fully private.
Correct another image
Drop in a new photo to adjust its gamma — free and unlimited, no signup required.
Choose The Right Tool
Why this page exists
Use gamma correction to adjust the midtone curve of a photo — lighten or darken without blowing out highlights or crushing shadows.
Best for
- Midtone adjustments that preserve highlights and shadows
- Correcting screen gamma differences for print or web
- A subtle, non-destructive tonal shift
Related tools people usually need next
Brightness Adjuster
Brighten or darken your photos
Apply a simpler linear brightness adjustment.
Exposure Image
Correct exposure in photographic stops
Adjust in photographic stops instead of a gamma curve.
Contrast Adjuster
Increase or reduce image contrast
Pair gamma with a contrast adjustment for tonal balance.