Duotone Image Generator

Apply duotone treatment with two colours — Spotify-style covers, brand photos, editorial art.

100% in your browser — files never uploaded.
    Postcrest — full AI image suite

    Need more than a converter? AI background removal, upscale, edit and generate — one workspace.

    Get the AI toolsSee pricing

    How to use the Duotone Image Generator

    1. 1
      Drop an image
      PNG, JPG or WebP — stays on your device.
    2. 2
      Adjust
      Tweak the controls to taste.
    3. 3
      Apply + download
      Click Apply, then Download. PNG output keeps full quality.

    About this filter

    All processing runs in your browser via the Canvas 2D API. The image is decoded, pixels are mutated in-place, and the result is re-encoded as PNG for download. No upload, no server processing, no watermark.

    Results are watermark-free with full commercial use. For higher-resolution AI-driven adjustments (face-aware upscale, AI editor, etc.) see Postcrest's paid AI image tools.

    Frequently asked questions

    Is it free?
    Yes — no signup.
    Are images uploaded?
    No — the Canvas API runs in your browser, nothing leaves your device.
    Max file size?
    Limited only by your device's memory. Most modern laptops handle 50+ MB inputs comfortably.
    Commercial use?
    Yes — output is yours.
    Mobile?
    Yes — works in iOS Safari and Android Chrome.

    Need more than free tools? Get Postcrest's full AI image suite.

    AI background removal, AI upscaling, AI image editor and AI photoshoot — every leading model in one workspace.

    AI Image Generator
    Every leading model — Flux, Nano Banana, Seedream, GPT-Image, SDXL.
    AI Image Editor
    Inpaint, outpaint, object removal — describe the edit, AI applies it.
    AI Background Remover
    Pixel-perfect cutouts in seconds — transparent PNG or any new scene.
    AI Image Upscaler
    Upscale to 4K, face-aware, print-ready, watermark-free.
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    50% off your first 2 months. Cancel anytime.