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AI Sketch to Image

Model:
Upload a sketch or line drawing, then describe what it should become. The AI follows the lines of your drawing and fills in colors, lighting, and detail in the style you pick.

Upload a sketch or line drawing

JPG, PNG, WebP up to 10MB

Sketch preview
~500 tokens (self-hosted free) to ~40,000 (Kontext Pro premium)
Generated image
Prompt used
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Ṣẹ̀dà

Ń ṣàfihàn àgbèwọlé rẹ̀...

Turn a sketch or line drawing into a fully rendered image. Photorealistic, anime, watercolor, 3D, and more. Free AI powered by FLUX ControlNet.

Bii o ṣe le lo AI Sketch to Image

1
Fi àwọn ìṣàmúlò-ètò rẹ̀ pamọ́

Ṣàfihàn àkọlé, láti fi fáìlì pamọ́, tàbí láti ṣàfihàn ohun tí o fẹ́. Kò ní àwọn àwọn kọ́̀ǹpútà tí a fẹ́.

2
Tẹ̀ láti ṣẹ̀dà

AI wá ń ṣé iṣẹ́ àgbèkalẹ̀ rẹ̀ nínú àwọn ìṣísẹ̀ láti ló àwọn módèlè̀ tí a ṣí lè lò.

3
Ṣàfikún & Àwọn Àkọsílẹ̀

Ṣàfihàn, kọ́, tàbí fi àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn àwọn

Use this tool via API

Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.

API Documentation Get API Key 
curl -X POST https://api.free.ai/v1/image/generate/ \
  -H "Authorization: Bearer sk-free-..." \
  -H "Content-Type: application/json" \
  -d '{"prompt": "A sunset over mountains", "model": "sdxl"}'

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AI Sketch to Image — FAQ

Upload a pencil sketch, line drawing, or rough doodle and the AI turns it into a fully rendered image. The drawing guides the composition — the AI fills in colors, lighting, textures, and detail in whatever style you pick (photorealistic, anime, watercolor, 3D, etc.).

Yes. Each render costs about 500 tokens. Signed-up users get 10,000 tokens/day free — enough for ~20 sketches every day without paying.

FLUX ControlNet with Canny edge detection. The ControlNet reads the lines of your sketch as a structural constraint and the diffusion model fills in the rest — giving much tighter adherence to your drawing than a plain image-to-image pass.

JPG, PNG, and WebP up to 10MB. Black-and-white line drawings on a white background work best, but pencil sketches and even phone-photos of paper sketches work fine — the edge detector is forgiving.

Photorealistic, illustration, anime, watercolor, oil painting, and 3D render. Each uses a slightly different prompt prefix plus tuned generation parameters. You can add any style words directly in your prompt too.

Use a clear sketch with clean lines, write a specific prompt ("a red sports car on a mountain road at sunset" beats "a car"), and pick High adherence if you want the AI to stick to your lines, Low if you want it to interpret more loosely.

High keeps the final image tight to your sketch — every line preserved, the AI just colors it in. Medium is balanced. Low gives the AI more creative freedom to deviate and fill in details you didn't draw.

Yes. You own the output and can use it for personal or commercial work — marketing, products, client deliverables, print, the lot. Free.ai claims no rights over what you generate.

No. Your upload is processed and discarded immediately. The generated image is kept on our CDN for 24h (7 days for paid users) at the share link, then deleted.

Yes — POST your sketch + prompt to /v1/image/edit/ with mode=sketch. Include style and strength as form fields. See /api/ for full docs and code examples.

Image-to-image uses the whole image (colors, shading, everything) as a starting point — outputs often look like recolored versions of the input. Sketch-to-image uses only the edges as structural guidance, so the AI has full freedom to invent color, lighting, and material — while still respecting your composition.

Yes. Snap a well-lit photo of your paper sketch and upload it. Clean contrast helps — if the paper is yellowed or shadowy, the edge detector still picks up the lines, but a scan or a black marker on white paper gives the sharpest result.

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