Fine-tune image tone and colour with Bézier curve editors per RGB channel. Drag control points to adjust shadows, highlights, and midtones. Download the adjusted image.
Open Curves Image Filter → free, no sign-inCurves editing — the ability to map input tonal values to different output values across each colour channel — is one of the most powerful tools in professional photo editing. Lightroom has it. Photoshop has it. Most browser-based image tools don't. The Curves Image Filter brings it to the browser with interactive Bézier curve editors per RGB channel, the same interface professionals have used for decades.
Photographers who want to make precise tonal corrections without a desktop application, designers adjusting image contrast for a specific visual effect, anyone who understands curves editing and wants to apply it without installing software.
No tutorials. No learning curve. Open it and get started.
No server uploads. Separate curve controls per channel — R, G, B, and master — give the same level of precision as desktop photo editors.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. Curves Image Filter was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What are curves?
Curves map input tonal values (horizontal axis) to output values (vertical axis). A point above the line brightens that tone; below darkens it.
What is the master curve?
The master curve applies the same adjustment to all three channels simultaneously.
How is this different from brightness/contrast?
Curves offer precise tonal control — you can lighten shadows while darkening highlights in one operation, something simple brightness adjustment can't do.
Is the original image modified?
No — the original is unchanged. You download a new adjusted file.
What file formats are supported?
JPG, PNG, and WebP images.
Free. Instant. No sign-in. Open it and get the job done.
Open Curves Image Filter on Doathingy.com →