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Free Gamma Adjuster online
Adjust gamma correction.
Gamma Adjuster is a free browser tool that lets you adjust gamma correction. Drop your file into Gamma Adjuster, choose your settings, and save the finished file. Gamma Adjuster works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- No uploads
- Works offline
Why use Gamma Adjuster
- adjust gamma correction without installing software
- Your file is processed on your device by Gamma Adjuster, never uploaded
- Gamma Adjuster needs no account, email address or payment details
- Gamma Adjuster is batch-friendly: reuse it immediately on the next file
- Gamma Adjuster is keyboard accessible and screen-reader friendly
- Gamma Adjuster is free forever, with no watermark on the result
Gamma Adjuster runs entirely inside your browser. Your file is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use Gamma Adjuster
- Add your file Drag your file onto the drop zone or pick it from your device.
- Adjust the options Set the options that control how Gamma Adjuster handles your input.
- Run the tool Gamma Adjuster works instantly on your device, with no queue and no upload wait.
- Download the result Save the finished file straight to your device, then reuse the tool as often as you like.
Benefits
Private by design
Your file stays on your device while Gamma Adjuster works. Gamma Adjuster never sends it to a server, so confidential work stays confidential.
Instant results
Gamma Adjuster finishes most jobs in under a second because the work happens on your own hardware.
No signup, no limits
Use Gamma Adjuster as many times as you want. Gamma Adjuster asks for no account, adds no watermark and keeps no paid tier gating the output.
Works offline
Once the page has loaded, Gamma Adjuster keeps working without a connection, which helps on flights and locked-down networks.
Who it is for
For designers
Designers use Gamma Adjuster to prepare assets for handoff without installing software: adjust gamma correction on a shared or locked-down machine.
For marketers
Gamma Adjuster helps marketers publish campaign assets quickly, since your file never leaves the laptop it was created on.
For freelancers
Gamma Adjuster helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
How it works
Gamma Adjuster loads your file into memory, applies the change you requested to the underlying data rather than to a screenshot of it, and writes a fresh copy for download. Your original stays untouched on disk, and every step of Gamma Adjuster happens inside your browser sandbox.
Frequently asked questions
Is Gamma Adjuster free to use?
Yes. Gamma Adjuster is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does Gamma Adjuster upload your file to a server?
No. Gamma Adjuster processes your file inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a file size limit?
The practical ceiling is your device's available memory rather than a server quota. Files up to roughly 100 MB work comfortably on a typical laptop in Gamma Adjuster.
Do I need to install anything to use Gamma Adjuster?
No installation is needed. Gamma Adjuster runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use Gamma Adjuster on a phone or tablet?
Yes. The Gamma Adjuster interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your file when I close the tab?
It is discarded. Gamma Adjuster keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
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Last updated: 2026-09-07