Color by Number Generator: Make One From a Photo in 60 Seconds

A color by number generator turns a photo or a shape into a numbered outline where each number stands for one color. Upload an image, pick how many pieces you want, then print the sheet or play it on screen — no drawing skill required.

Most of the free generators you'll find do one thing: they hand you a PDF. That's genuinely useful if you own paints and a printer. It's less useful at 4pm on a Tuesday when your 7-year-old wants an activity now and the printer is out of magenta.

This is a walkthrough of how these tools actually work, what the output looks like at each difficulty setting, and which generator to pick depending on whether you want paper or a screen.

The free generators, compared

Tool	What you get	Playable on screen	Share by link or QR	Free limit
PBNify	Printable paint-by-number outline	No	No	No stated cap
Davincified	Printable PDF, no watermark	No	No	No stated cap
paint-by-number.com	Color-by-numbers sheet	No	No	Advertises "no limit"
SnapXam	Color by number from any image	No	No	Free
QrdyCraft	Sticker mosaic sheet + online puzzle	Yes	Yes	100 per month

The honest read: if all you want is an unlimited stream of printable pages, the four tools above are simpler and they don't meter you. QrdyCraft is the only one in this list where the finished thing is also playable — a drag-and-drop puzzle you can hand to a kid on a tablet, or pass to a grandparent as a link.

Before and after: what the generator actually does

Every one of these tools runs the same two-stage pipeline. First it reduces your image to a clean shape. Then it divides that shape into regions and assigns each region a number and a color.

Here's stage one — a plain pumpkin silhouette, no detail, no numbers:

And here's the same silhouette after tessellation, cut into 45 numbered pieces across 6 colors:

That's the whole trick. The reason the result looks hand-designed is that the piece boundaries follow the shape's own ribs and curves rather than a square grid — which is also why a photo with a clear subject converts far better than a busy one.

How it works, in three steps

1. Upload a photo, or type a word. A photo of a pet, a drawing your kid made, or just the word "rocket" — all three produce a shape. Photos with one clear subject and a plain background convert cleanest; group shots and busy backgrounds turn to mush at every generator, not just this one.
2. Pick a difficulty. This controls how many pieces the shape gets cut into. More pieces means a longer, fussier activity with smaller stickers.
3. Print it or play it. Download the sticker sheet and cut it out, or open the online puzzle and drag pieces into place. The online version tracks progress as you go, so a kid can stop and come back.

What each difficulty setting really gives you

Piece counts vary by shape, so treat the labels as a range rather than a promise. Here are the three real outputs from the same pumpkin, generated for this article:

Difficulty	Pieces on this shape	Rough age fit
Easy	33	4–6
Medium	45	7–9
Hard	81	10–12

Easy — chunky pieces, big enough for small fingers to peel and place without tweezers:

Hard — 81 pieces on the identical outline, closer to a real sticker-mosaic book:

A useful rule from watching kids do these: pick one level below what you think they can handle. A 45-piece sheet finished in one sitting beats an 81-piece sheet abandoned at piece 30.

The free limit, stated plainly

QrdyCraft gives you 100 free mosaics a month — more than one a day, every day. The competitors above mostly advertise no cap at all, so if raw volume is what you're optimizing for, they win that line. What the 100 buys you is the part they don't have: a puzzle that plays in a browser and travels as a link or QR code, so the kid doing it doesn't need your laptop, an account, or an app install.

Worth being clear about the positioning too: this is a tool a parent uses to make something, which a child aged roughly 4–12 then plays with or sticks down. It isn't an app you hand a toddler.

Make your first mosaic at craft.qrdyai.com →

Print or screen: which to choose

Go printable if you want a screen-free afternoon, you already own a printer and sticker paper, and the peel-and-place motion is the point — that's the fine-motor part, and it's the reason these activities work so well for younger kids.

Go online if you're in a waiting room, a car, or a hotel; if there's no printer; or if you want to send the finished puzzle to a relative who'd enjoy doing it too. The QR code is the whole feature here: one scan, no sign-in.

Plenty of families do both — play the puzzle on screen first to learn the shape, then print the same design to stick down for real.

Related reading

• Free Paint by Number Generator: 6 Tools Compared — a wider roundup, including the paid kit sellers
• How to Turn a Photo Into a Paint by Number (Free) — photo-specific tips for cleaner conversions
• Orange Pumpkin mosaic template — the ready-made version of the design used throughout this article