Drop a photo here
or click to choose · or paste (Ctrl/Cmd + V)
processed in your browser · never uploaded
Turn a photo of your kids, pets, a landscape, or an illustration into a printable coloring page — clean black outlines on a white background, ready to color in. It removes the colors and keeps the edges as lines, giving you a coloring sheet like the ones you buy. Under the hood, the image is converted to grayscale, lightly denoised, and then a Sobel filter measures the edge strength (how fast brightness changes) at every pixel; a threshold then splits the result into lines (black) and areas to color (white). Raising "line amount (detail)" lowers the threshold so finer lines and small details are kept, while lowering it leaves only the main outlines for a simpler page. "Line thickness" thickens the strokes so they are easier for young kids to color and less likely to break up when printed. If a grainy photo produces noisy lines, raise "noise reduction". The preview updates instantly, and the result is saved as a black-on-white PNG you can print and color with pencils, crayons, or markers. Great for birthday parties, classroom and daycare activities, gifts, or DIY fan crafts. Nothing to install and nothing to upload — loading, converting, and saving all happen locally in your browser, so your photo is never sent anywhere.
How to use
- Drop the photo (PNG/JPG) you want to turn into a coloring page (or click to choose, or paste with Ctrl/Cmd+V).
- Use "line amount (detail)" to control how many lines are kept and "line thickness" for how bold they are. If a grainy photo gives noisy lines, raise "noise reduction".
- Tune the look in the preview, then click "Download PNG" to export the black-on-white image and print it to color in.
FAQ
Is my photo uploaded to a server?
No. Loading the photo, converting it to line art, and saving all happen in your browser. The photo is never uploaded, stored, or sent anywhere — everything is processed only on your device.
What kind of photos work best?
Bright, well-lit photos with clear subjects and uncluttered backgrounds produce the cleanest line art. Backlit or dark photos and busy patterns can produce too many lines; lower "line amount" and raise "noise reduction" to clean them up.
What if there are too many or too few lines?
Adjust "line amount (detail)". Raising it keeps finer detail; lowering it leaves only the main outlines for a simpler page. If the lines look thin or broken, raise "line thickness" so they print and color better.
Can I print the result?
Yes. It exports as a black-on-white PNG, so you can print it and color it with pencils, crayons, or markers. For young children, raise "line thickness" and lower "line amount" to keep it simple and easy to color.
Can I use it for events or commercial use?
The conversion only happens in your browser; the copyright and likeness rights of the original photo still apply to that photo. Use photos you own or have permission to use. This tool places no extra usage restriction on the line art you create.