BYTETOOLS

Duotone Image

Create a duotone image by mapping shadows and highlights to two chosen colors. Free, private, browser-based duotone effect with live preview.

Drop an image for a duotone effectProcessed locally — never uploaded

What is the Duotone Image?

The ByteTools Duotone tool recolors an image using just two colors: one for the shadows and one for the highlights.

  • Map shadows and highlights to two custom colors
  • Luminance-based gradient for smooth tone mapping
  • Perfect for brand-colored, editorial visuals
  • Fast single-pass processing with live preview
  • Any color combination via the pickers
  • 100% private — images never leave your browser

How to use the Duotone Image

  1. 1

    Drop an image into the upload area, or click to browse.

  2. 2

    Choose a shadow color for the dark tones.

  3. 3

    Choose a highlight color for the light tones.

  4. 4

    Preview the duotone result in real time.

  5. 5

    Click Download PNG to save the duotone image.

About the Duotone Image

The ByteTools Duotone tool recolors an image using just two colors: one for the shadows and one for the highlights. It reads the brightness of each pixel and maps it along a gradient between your two picks, producing the striking two-tone style seen in modern branding and album art.

Pick any shadow and highlight color to match your brand or mood — deep navy to warm gold, teal to pink, or classic black to white. The preview updates instantly so you can experiment freely.

The duotone mapping runs locally on an HTML canvas in your browser in a single pass. Your image is never uploaded, so brand assets and personal photos remain private on your device.

Frequently asked questions

How do I make a duotone image?

Upload a photo, pick a shadow color and a highlight color, and the tool maps the image's brightness between the two. Preview it live and download the duotone PNG when you are happy.

What is a duotone effect?

A duotone remaps a photo to two colors — one for dark areas and one for light areas — with a smooth gradient in between. It creates a bold, cohesive look popular in branding, posters and album covers.

Which colors work best for duotone?

High-contrast pairs usually look best: a dark, saturated shadow color with a bright highlight color, such as deep purple and yellow or navy and cyan. Matching your brand colors keeps visuals consistent.

Is my image uploaded to create a duotone?

No. The duotone mapping happens in your browser using the canvas API, so nothing is sent to a server and your images stay private.

Guides for Duotone Image

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