# AI Line Art Colorizer

> Auto coloring with AI means uploading black-and-white line art and letting an image model fill it with colour while the outlines stay where you drew them. On Kenerate AI you upload the drawing in the Image Studio, name the colours and the style, and add “keep every line exactly as drawn”. In our three tests GPT Image 2.5 Sunburst (11.7 credits) and Qwen Image 3.0 (9.9 credits, free plan) both kept the drawings' composition and outlines on the first try.

URL: https://kenerateai.com/ai-line-art-colorizer
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 31 October 2026

## Key facts
- Drawings tested: 3 coloring pages (kids, scene, detailed)
- Lines kept: 3 of 3, first try
- Styles tried: Flat cartoon · watercolour · flat colour
- Cost: 11.7 credits (GPT Image 2.5 Sunburst) · 9.9 (Qwen Image 3.0)
- Free-plan option: Qwen Image 3.0
- Input: Drawings, scans, coloring pages or phone photos of line art
- Watermark: None

## Steps
1. Open the Image Studio — Go to /app/image. Sign in free for 25 starter credits.
2. Upload your line art — Add the drawing, scan, comic panel or coloring page. Add a coloured page as a second reference to match a palette.
3. Describe the colours — Name the colour of each main part and the style, and add “keep every line exactly as drawn”. Pick GPT Image 2.5 Sunburst, or Qwen Image 3.0 on the free plan.
4. Download — Regenerate if a colour is off, then download without a watermark — or upscale up to 4K for printing.

## In depth

### What you can colour
Anything with clear outlines. People searching for auto coloring usually have one of these:
- Coloring pages: printed or AI-made pages coloured as a preview, a cover or a finished print.
- Sketches and inked drawings: your own art turned into a colour concept in seconds.
- Comic and manga pages: a first colour pass or a colour guide for the colourist.
- Kids' drawings: a child's drawing coloured in the colours they pick.
- Tattoo and logo line art: try several colour schemes before committing to one.

### 8 coloring prompts you can copy
Upload your line art first, then use one of these. Each ends with the line-keeping sentence that worked in our tests:
- Flat cartoon: “bright flat colours with light cel shading, name each part's colour. Keep every black outline exactly as drawn.”
- Anime cel shading: “anime cel shading, two tones per colour, soft rim light, character with silver hair and blue eyes. Keep every black outline exactly as drawn.”
- Watercolour: “soft watercolour with light paper texture, warm palette. Keep every black outline exactly as drawn.”
- Coloured pencil: “coloured pencil texture, visible strokes, pastel palette, white paper showing through. Keep every black outline exactly as drawn.”
- Marker: “alcohol-marker look, bold saturated colours, slight streaks. Keep every black outline exactly as drawn.”
- Flats only: “flat colours only, no shading, no gradients, no texture. Keep every black outline exactly as drawn.”
- Night scene: “colour it as a night scene, deep blue sky, warm yellow window light. Keep every black outline exactly as drawn.”
- Match a palette: “use the colours of the second image for this drawing. Keep every black outline exactly as drawn.”

### What we got
Three coloring pages from our coloring page generator, one prompt each, first try, 33.3 credits in total:
- All three kept the composition and the outlines — the turtle's shell plates, the cobblestones and every fern leaf are where they were drawn.
- GPT Image 2.5 Sunburst added details on its own in the dinosaur page: spots on the back, clouds and a distant tree line, even though the prompt said “do not add anything”.
- The street page came back as a real watercolour, but without its café signs — the prompt said “no text or signs”, and the model removed them. Leave that out if you want lettering kept.
- Qwen Image 3.0, the free-plan model, followed the turtle drawing most closely and used every colour we named.

## FAQ
Q: What is auto coloring?
A: Auto coloring is filling black-and-white line art with colour automatically. With an AI image model you upload the drawing, describe the colours and style, and the model paints inside the lines. On Kenerate AI that happens in the Image Studio; GPT Image 2.5 Sunburst and Qwen Image 3.0 kept the outlines of all three drawings we tested.

Q: Is the AI line art colorizer free?
A: Free to start. A new Kenerate account gets 25 credits on sign-up — enough for two colourings with Qwen Image 3.0 (9.9 credits each), which works on the free plan. GPT Image 2.5 Sunburst (11.7 credits per edit) unlocks once you buy a credit pack. Packs are one-time and don't expire; downloads carry no watermark.

Q: Will the AI keep my lines?
A: Mostly, if you ask. Write “keep every black outline exactly as drawn — same lines, same shapes, same composition”. In our tests the outlines and layout stayed, but GPT Image 2.5 Sunburst also added small things on its own — spots on the dinosaur, clouds and a distant tree line. If an exact line matters, check it and regenerate.

Q: Can I colour manga or comic pages?
A: Yes. Upload the page and name the colours of each character — hair, eyes, outfit — plus the style, for example “anime cel shading”. Seedream 5.0 Pro suits anime looks. To keep a character's colours the same across pages, add an already-coloured page as a second reference. Only colour pages you drew or have the rights to.

Q: Can I choose the colours?
A: Yes — the colours come from your prompt. Name the main parts one by one (“green dinosaur, pale yellow belly, blue sky”). Anything you don't name is the model's choice. You can also add a coloured image as a palette reference and write “use the colours of the second image”.

Q: What kind of line art works best?
A: Clean, dark lines on white: inked drawings, coloring pages, vector line art and flat scans. Phone photos work if the page is flat and evenly lit. Light pencil sketches with grey shading give softer, less exact results — trace or darken the lines first, or turn a photo into clean lines with the line art generator.

Q: Can I get flat colours for further editing?
A: Ask for “flat colours, no shading, no texture”. The result is a normal image, not separate colour layers, so for production comics most artists use it as a colour guide and repaint on their own flats layer.

Q: What resolution do I get?
A: Our examples came out at about 880 × 1184 pixels (1K, 3:4). GPT Image 2.5 Sunburst renders up to 4K, and the Image Upscaler takes any result up to 4K for printing.

Q: How is this different from colorizing a photo?
A: Colorizing a photo adds realistic colour to a black-and-white photograph — skin, sky, clothes as they would have looked. Line art coloring fills a drawing's outlines with paint-like colour in a style you choose. For old photos use the photo colorizer instead.

## Related pages
- Line art generator: https://kenerateai.com/line-art-generator
- AI coloring page generator: https://kenerateai.com/ai-coloring-page-generator
- Sketch to image: https://kenerateai.com/sketch-to-image
- Colorize photo: https://kenerateai.com/colorize-photo
- Recolor image: https://kenerateai.com/recolor-image
- AI manga generator: https://kenerateai.com/ai-manga-generator
- Photo to sketch: https://kenerateai.com/photo-to-sketch

## Sources
- Kenerate Image Studio: https://kenerateai.com/app/image
- Kenerate terms of service: https://kenerateai.com/terms