Adjust Brightness & Contrast
Two sliders that fix most photos: brightness to lift or lower the overall exposure, contrast to add punch or soften it. Preview live, compare against the original, and export — all without uploading anything.
Privacy-first: every image is processed locally in your browser. Nothing is uploaded, stored or transmitted to any server.
The difference between the two
Brightness moves every tone in the same direction at once: raise it and the whole picture lifts, shadows included, which is what an underexposed photo needs. Contrast does the opposite of moving things together — it pushes light tones lighter and dark tones darker, spreading them apart so the image looks sharper and more three-dimensional.
Using only one of them rarely gets there. Lifting brightness on a dark photo makes the shadows gray and the picture hazy, so a small contrast increase afterwards restores the depth. Adding contrast to an already dark photo crushes the shadows, so a little brightness first keeps them alive. The live preview makes the interaction between them obvious in a couple of seconds.
Let the histogram decide
If you would rather not guess, Auto levels reads the actual distribution of tones in your image, discards the extreme 0.4% at each end so a single stray highlight cannot skew it, and stretches what remains across the full range. For most flat or dull photos that single click gets you most of the way, and you can fine-tune from there.
Everything is non-destructive while you work: the original file is untouched, the sliders can be reset in one click, and holding the compare button shows the untouched image for as long as you keep it held.
Beyond exposure
The same panel also carries saturation, warmth, hue, black & white, sepia, color inversion and a vignette, so a correction that starts as "a bit too dark" can end wherever you want it. Drop in several images and the settings apply to all of them at once — handy for a set of photos shot in the same bad light. Export as JPG, PNG or WebP, alone or as a ZIP; nothing is ever uploaded.
Frequently asked questions
- Is my image uploaded to adjust it?
- No. Every adjustment is computed on a canvas inside your browser, so the photo never leaves your device and no server ever sees it.
- How do I make an image black and white?
- Set the “Black & white” slider to 100% — or click the B&W look, which also adds a little contrast so the result does not look flat. Noir goes further with a much harder contrast curve.
- What does inverting the colors do?
- It replaces every color with its opposite, which turns a photo into a negative: white becomes black, blue becomes orange. It is how you read a scanned film negative, and a quick way to flip a screenshot to a dark version.
- What is the difference between brightness and contrast?
- Brightness moves every tone up or down together, so the whole picture gets lighter or darker. Contrast pushes light and dark tones apart, which adds punch — or, in the negative direction, flattens the image into a soft, hazy look.
- What does Auto levels do?
- It measures each color channel of your photo, ignores the extreme 0.4% at each end, and stretches what is left across the full range. Washed-out, hazy or underexposed shots usually snap back to life with a single click.
- Can I adjust many photos at once?
- Yes. Drop in as many images as you like — the settings apply to all of them, and you can download the results individually or together as a single ZIP.
- Will adjusting reduce quality?
- The adjustment itself works at full resolution with no downscaling. Only the re-encode matters: choose PNG for a lossless result, or keep JPG/WebP at a high quality setting.