Recolour any photo with just two colours for a bold poster look — free, in your browser. Your images never leave your browser.
What this tool does
A duotone photo uses just two colours: one for the shadows and one for the highlights, with every shade in between blended from those two. The result looks bold, modern, and consistent, which is why brands, magazines, and album covers use it. This duotone photo filter applies the effect to any photo in your browser. You pick a dark colour and a light colour, the tool maps every pixel’s brightness to a blend of the two, and you download the result as a PNG. Your photo stays on your device throughout.
Duotone is a fast way to make a set of different photos look like they belong together. A travel blog, a team page, or a product catalogue can share one colour pair across all images, and suddenly the whole set feels designed. It also rescues photos with dull or clashing colours, because the original colours are replaced entirely by your chosen pair.
Why it is useful
Colour consistency is hard to achieve by hand. Editing each photo separately to match a brand palette takes time and a trained eye, and results drift from image to image. A duotone filter fixes the palette by construction: every photo uses exactly the same two colours, so the set always matches. It is also forgiving for beginners, because there are only two choices to make, and both can be changed instantly. For social media, a strong duotone stands out in a feed full of ordinary photos, which is a practical advantage for small creators.
How to use it
Applying a duotone is quick.
- Upload your photo with the file button.
- Pick a dark colour for the shadows and a light colour for the highlights.
- Press the apply button and check the preview.
- Download the PNG, or change the colours and try again.
A practical example
A small business wants its team page to match its brand: deep navy and bright yellow. Each team photo, taken in different light and places, goes through the filter with the same two colours, and the page instantly looks unified. A musician does the same for single artwork: a concert photo in black and hot pink becomes a poster that matches the tour branding. A blogger uses a softer pair, dark teal and cream, for a calm, editorial feel across a whole article series.
Tips for good results
Choose pairs with strong contrast between dark and light, or the result will look flat and grey. Classic pairs are navy and yellow, black and red, and dark green and cream, but any pair with a clear dark and light end works. Test the same pair on several photos before committing, because a pair that flatters a portrait may dull a landscape. Keep the original photos, so you can re-filter with a new palette when a brand or theme changes.
Honest limits
Duotone replaces all original colour, so it cannot keep a product’s true colours. If exact colour matters, for example for a paint or fabric catalogue, duotone is the wrong choice. Photos that are already very dark or very bright lose detail, because most pixels land near one end of the blend. The tool also works from brightness only, so two areas with the same brightness but different colours will map to the same duotone shade. That is the nature of the effect, and it is what gives duotone its unified look.
Frequently asked questions
Is the duotone filter free?
Yes, it runs in your browser with no account and no payment.
Can I use my brand colours?
Yes, pick any two colours with the colour pickers, including exact brand colours.
Does it keep the original colours?
No, duotone replaces them with your two chosen colours by design.
Is my photo uploaded?
No. Filtering happens in your browser and nothing is sent to a server.
También disponible en español: Filtro Duotono para Fotos Gratis – Efecto de Dos Colores Online.