Brightness, contrast, grayscale and color inversion — applied to whole batches. Every tool below runs locally in your browser — batch, free, no signup, no watermarks.
Tonal adjustment is the difference between a photo that documents and a photo that reads. This category applies the four corrections that fix most images — Change Image Brightness, Adjust Image Contrast, Grayscale Image and Invert Image Colors — with live sliders that render on the real pixels, not an approximation. Every setting applies identically across the whole batch, which is what keeps galleries and product sets looking intentional.
Order of operations matters: fix geometry first (the croppers and rotators), adjust tone second, and compress last so you never spend bytes on artifacts. The formulas are tuned rather than naive — luminance-preserving grayscale instead of a flat desaturate, for instance — so results hold up at full resolution and in print. Everything runs locally, offline included.
See all 88 tools or the blog guides.