Coloring Page Maker

About the Coloring Page Maker

The Coloring Page Maker turns any photo into a printable black-and-white coloring page. It runs the image through grayscale, Gaussian smoothing, and Sobel edge detection to extract clean outlines, then thickens and inverts them into bold lines on a white background — ready to print on a single sheet of Letter or A4 paper.

For pages aimed at kids, flip the Focus on big objects only toggle. The tool flattens fine textures, collapses similar shades into bands, and drops short edge fragments so the result is dominated by the major shapes in the photo — easier to color inside without dozens of tiny regions to chase.

Everything happens locally in your browser. Your photo is never uploaded, and the final PNG or PDF is generated on your device.

What you can control

• Drop in any JPG, PNG, or HEIC photo from your computer or phone
• Toggle "Focus on big objects only" for a simpler, kid-friendly outline
• Adjust the edge-detail threshold to keep more or fewer lines
• Apply smoothing to reduce noisy textures (skin, foliage, gravel)
• Set line thickness so kids' markers don't bleed past the outlines
• Choose Letter (8.5×11) or A4 paper, with auto-fit and a print margin
• Export a print-ready PNG (300 DPI) or PDF in one click

Common uses

• Kids' rainy-day activities, road-trip packs, and party favors
• Classroom worksheets featuring the students' own photos or pets
• Personalized birthday-party coloring pages
• Therapy and mindfulness coloring for adults
• Custom craft templates for scrapbooking and journaling

Tips

• High-contrast subjects (a pet on a plain background) trace cleaner than busy scenes
• Crop or remove the background first if your photo has a lot of distracting detail
• For a child-friendly page, switch on "Focus on big objects only" — it skips clutter like grass, fur, and brick texture and keeps only the main shapes
• Start with medium smoothing and adjust upward if the lines look noisy
• Print a test page on draft mode first to confirm line thickness before doing a full batch

For the best results with portraits, shoot or crop tightly on the face and shoulders — fewer pixels of background means fewer stray lines for kids to color around.