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Curves

Three sliders: shadows · midtones · highlights. Runs locally, nothing is uploaded.

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Curves is the one colour tool that handles brightness and contrast at the same time: bend the line into an S and the darks go darker while the lights go lighter — the photo gets its snap back. Dragging a brightness slider alone only washes the whole frame out. It looks abstract but follows a single rule: the horizontal axis is the brightness you had, the vertical is the brightness you get.

On a curve, the horizontal axis is the old brightness and the vertical is the new one; pulling it into an S adds contrast. This page boils that down to three sliders: “Shadows” darkens or lifts the dark end, “Midtones” moves the overall brightness, “Highlights” holds back or lifts the brightest band — an S is simply shadows down and highlights up. Change any of them and the right side recomputes at once. For the real curves panel, press “Pro editor” for the full editor: there you can add a control point at any brightness, pull red, green and blue separately as well as the RGB composite (the most direct way to fix a colour cast), use the 10 built-in presets (Enhance Contrast, Cross process, Color Negative, Negative (invert) and so on), press Ctrl+M as in Photoshop (it edits the pixels directly), and import Photoshop .acv preset files. For a non-destructive version, use Layer > New Adjustment Layer > Curve: then it is an adjustment layer whose settings you can go back and change, and deleting it returns you to the original.

Key features

Three sliders, done

Shadows, midtones and highlights each own one band — you get contrast without knowing how to pull a curve.

Per-channel is in the editor

Red, green and blue pulled separately alongside the RGB composite — the most direct fix for a colour cast, in the full editor's curves panel.

10 presets and .acv import (editor)

Increase Contrast, Cross Process, Colour Negative and seven more, plus Photoshop .acv preset files opened directly — all in the full editor.

Non-destructive (editor)

In the full editor, Layer > New Adjustment Layer > Curve adds an adjustment layer: not a pixel of the original moves, and the settings stay editable or can be deleted. This page simply hands you a new image.

How to use

  1. 1
    Add an image
    Drag it into the box, or press Ctrl+V to paste.
  2. 2
    Drag the three sliders
    Shadows down and highlights up is the S that adds contrast; midtones moves the overall brightness. The result on the right keeps up.
  3. 3
    For a colour cast, go pro
    The three sliders here act on the whole image. To pull red, green or blue separately and straighten out a cast, press “Pro editor” for the full editor.
  4. 4
    Download
    Save it, or carry on to Levels.

FAQ

Is it the same as Photoshop Curves?
Not on this page — here the curve is boiled down to three sliders (shadows, midtones, highlights) so that you get the effect without learning the curve. In the full editor it is: RGB composite plus red, green and blue, Ctrl+M as the shortcut, and Photoshop .acv preset files import straight in.
What if I do not know how to pull curves?
That is exactly what this page is for: three sliders, drag and it is done, no curve to understand. If you want presets, the curves panel in the full editor has 10 built in; and for a one-click look, the filters page suits better.
Can I change it back afterwards?
What you download here is a new image; your original is untouched on your disk. For settings you can go back and change — a non-destructive adjustment layer — use Layer > New Adjustment Layer > Curve in the full editor: the curve lives there as a layer, and deleting it returns you to the original. (Curves opened with Ctrl+M edit the pixels directly.)
Is my image uploaded? Do I need an account?
Nothing is uploaded — it all runs in your own browser. Free, no sign-up, no usage limit.

Try Curves now

No install · no sign-up · local stays local · free AI credits every day