Coloring Mill — line art library + photo converter

Any photo becomes a colouring sheet your class can actually print.

1,341 original line drawings sorted by topic, plus an AI that redraws your own photos as clean outlines. Set the line weight for the hands holding the crayon, pick a paper size, print.

Start free Browse the library

1,341drawings, all original

23topics to teach from

A4 & Lettertrue-to-size output

Drag to compareAnteaterA4 portrait

From photo to paper

Three steps, and the last one is a printer.

STEP 01

Pick or upload

Choose from the library by topic, or drop in a photo — a pet, a school trip, a child’s own toy.

STEP 02

Set the line

Thicker outlines and fewer details for small hands. Keep a colour reference, or drop the background entirely.

STEP 03

Print the pack

One sheet or thirty. True A4 and Letter margins, a title line for names, a file that opens in any staffroom printer.

The library

A drawing for whatever you’re teaching this week.

Everything is drawn in one consistent style, so a worksheet mixing animals and vehicles still looks like it belongs together.

23 topic families, from farm animals to everyday objects
Every drawing ships with a suggested colour reference
Search by word, filter by topic
Save anything to your own collection and reprint it forever

Open the library

Line weight

The same photo, tuned to the hand holding the crayon.

A three-year-old needs a bold, forgiving outline. A nine-year-old wants detail worth shading. One slider, no redrawing.

Thin, medium and bold outlines from the same photo
Detail reduction that removes interior lines, not just thins them
Choose whether the background stays, simplifies or goes

See the converter

Anteater drawn with a bold outline for younger children

Bold · small hands

Medium · most classes

Anteater drawn with a fine outline for older children

Fine · older children

Weight is applied when the sheet is made, so the printed line matches what you see.

Colour reference

Show them what it could look like.

Every library drawing has a coloured twin. Print it small in the corner of the sheet, project it on the board, or hand it out as a target for older children.

Reference thumbnail printed inline or on a separate key page
Toggle it off entirely when you want open-ended colouring
Works the same way on your own converted photos

OUTLINE

REFERENCE

OUTLINE

REFERENCE

Before you ask

The practical questions.

Can I use the sheets in my classroom?

Yes. Print, photocopy and hand them out freely in any classroom, clinic or home. A sheet made from your own photo is yours outright; the library drawings stay ours, so please do not resell those.

What happens to photos I upload?

They are used to produce your line drawing and nothing else. We never use uploaded photos to train anything. Photos of children are common on this product and we treat them accordingly.

Does it work on photos of people?

Yes, and it is the hardest case. Faces convert best in good light against a plain wall. You see the result before you keep it, and you can re-run with different settings.

What do I actually get as a file?

A print-ready page at true A4 or US Letter with correct margins, and a PNG you can drop into a worksheet you are already building.

How does pricing work?

One credit converts one photo. Credits are bought once and never expire into a subscription — there is no recurring charge.