What Is a Duotone Effect?
A duotone effect transforms any photo into a striking two-tone image by mapping dark areas to one color (shadow) and light areas to another (highlight). This technique, popularized by Spotify's iconic cover art, creates bold, eye-catching visuals perfect for posters, social media, and editorial designs.
Instant Preview
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Full Control
How to Use
Upload Your Image
Click the upload zone or drag and drop a PNG, JPG, or WebP file directly into the browser.
Choose Colors
Pick a preset or manually select shadow and highlight colors using the color pickers.
Adjust Settings
Use the Intensity slider to control effect strength, and the Contrast slider to enhance tonal separation.
Compare Results
Toggle "Before / After" to see the original and processed image side by side.
Download
Select your preferred format (PNG, JPG, or WebP) and click Download.
Quick Tips
- Use the Swap button between the two color pickers to quickly reverse the effect
- Click Random to discover unexpected color combinations
- Lower the Intensity to create a subtle tinted look instead of a full duotone
Features
Custom Color Pairs
Choose any two colors for your duotone effect. Use the built-in color pickers, type hex values directly, or select from curated presets.
- 12 curated presets (Spotify Green, Ocean Blue, Sunset, Purple Haze, etc.)
- Manual hex color input
- Instant color swap function
- Random color generator
Real-Time Preview
See your changes instantly as you adjust colors, intensity, and contrast. The canvas updates in real time for precise fine-tuning.
- Instant visual feedback
- No waiting for processing
- Live adjustment preview
Intensity & Contrast Control
Fine-tune your duotone effect with precision controls for both intensity and contrast.
- Intensity slider: Blend between original and full duotone (0–100%)
- Contrast slider: Adjust tonal range (-100 to +100)
- Create subtle tints or bold effects
Before / After Comparison
Toggle comparison mode to view original and processed images side by side with a draggable slider.
- Side-by-side comparison view
- Interactive slider control
- Evaluate changes precisely
Multiple Export Formats
Download your duotone image in the format that best suits your needs.
- PNG: Lossless quality, perfect for graphics
- JPG: Smaller file size, ideal for web
- WebP: Modern format with excellent compression
Your Data Stays Private
All processing happens in your browser using the Canvas API. Complete privacy guaranteed.
- No uploads: Images never leave your device
- No tracking: We don't collect usage data
- No server processing: 100% client-side
Frequently Asked Questions
What image formats can I upload?
You can upload PNG, JPG, and WebP images. The tool works with any image size, though very large images may take a moment to process.
What is the difference between shadow and highlight colors?
The shadow color replaces dark areas of your image, while the highlight color replaces bright areas. Together they create the two-tone effect. You can swap them at any time to reverse the look.
Will the output image be the same size as my original?
Yes. The downloaded image retains the exact dimensions of your original file. The preview is scaled for display, but the export is always full resolution.
Can I create a subtle tint instead of a strong duotone?
Yes. Lower the Intensity slider to blend the duotone effect with the original image. At 50%, you get a half-strength tint; at 0%, you see the original photo.
Is my image uploaded to a server?
No. All processing is done locally in your browser using the Canvas API. Your images never leave your device, ensuring complete privacy and security.
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