Brightness and Contrast Adjuster
Fine-tune photo brightness and contrast in your browser.
How to use
- 1 Drop an image onto the box, or click to choose a file.
- 2 Drag the Brightness slider to lighten or darken the photo.
- 3 Drag the Contrast slider to add or reduce punch.
- 4 Use Reset adjustments to return to the original at any time.
- 5 Click Download PNG to save the result.
About Brightness and Contrast Adjuster
The Brightness and Contrast Adjuster gives you two precise sliders to rescue a flat, dark or washed-out photo without opening a heavyweight editor.
Drop in a JPEG, PNG, WebP or GIF and it is decoded and edited entirely on your own device, with the preview updating the instant you move a slider.
Brightness adds a flat offset to every pixel, lifting an underexposed shot out of the shadows or pulling back a blown-out one.
Contrast works differently: it stretches or compresses the tonal range around mid-grey, so the lights get lighter and the darks get darker without shifting the overall exposure.
Used together they let you give an image punch, recover detail, or soften a harsh photo in seconds.
Because the tool always re-applies its adjustment to the untouched original rather than stacking changes, you can drag the sliders back and forth freely and even reset to zero — the result is identical to loading the photo fresh, with no cumulative banding or quality loss.
Everything happens locally with the Canvas API, so your pictures are never uploaded, stored or logged, which makes it safe for private snaps, screenshots and client work, and it keeps working offline once loaded.
When the look is right, download a lossless PNG.
FAQ
Is my photo uploaded to a server?
No. The image is decoded and edited with the Canvas API inside your browser, so it never leaves your device.
Will repeated adjustments degrade the image?
No. Each change is re-applied to the original pixels, never to an already-edited copy, so there is no cumulative quality loss.
What is the difference between brightness and contrast?
Brightness shifts every pixel up or down evenly; contrast stretches the gap between light and dark tones around mid-grey.