The drawing grid for serious artists.
Upload a reference photo, overlay a customizable grid, convert to black & white, detect edges, and print a large-format reference — all in your browser.
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Everything you need to grid your reference
Photo Upload
Drop any reference photo into the browser — JPG, PNG, or WebP. No account needed, no server upload. Your image stays on your device and is ready to work with instantly.
Crop & Resize
Frame exactly what you want to paint. Drag the crop box, choose an aspect ratio preset, or lock to your canvas proportions. Scale and reposition freely until the composition is right.
Black & White
Switch to grayscale instantly to study light and shadow distribution. Posterize into 2 to 10 tonal steps for a clear value map — the foundation of every strong painting.
Grid Overlay
Customize rows, columns, line weight, color, and opacity to match your canvas. Enable square cells, diagonal guides, or focus mode to isolate a single cell while you draw.
Image Adjustments
Fine-tune brightness, contrast, and saturation to get the clearest possible reference. Compensate for dark or washed-out photos before analyzing values or transferring proportions.
Canvas Size
Enter your physical canvas dimensions in centimetres or inches. The grid automatically calculates and displays each cell size, so you know exactly how large to draw every square.
Grid Labels
Add number and letter labels to rows and columns for systematic cell-by-cell transfer. Label both sides of the grid or every individual cell — never lose your place in a complex composition.
Auto-Save
Your session auto-saves in the browser as you work. Close the tab, come back later, and pick up exactly where you left off — crop, grid settings, adjustments, and all.
Private by Default
Your photos never leave your device. All image processing — cropping, grid overlay, B&W conversion, edge detection — happens entirely in your browser. Nothing is uploaded to any server.
Three steps to your drawing guide
Watercolorists paint light-to-dark — every wash is permanent, so you need to plan your values before the first stroke. The grid method lets you map proportions and light distribution from any reference photo, digitally and precisely.
Upload your reference
Drag a photo into the browser or click to select. The image stays on your device — nothing is uploaded to a server.
Convert to grayscale
Switch to grayscale to strip away color and reveal the underlying value structure — light, mid-tone, and shadow. Essential for watercolor planning.
Overlay the grid
Add a square-cells grid and posterize your image. Choose from 2 to any number of value steps — start with a bold two-tone to find the big shapes, then increase for more nuance. Transfer each square to your canvas.
Print a large-format reference photo — any canvas size, any home printer
A single page is rarely enough. When you work at an easel, your reference needs to be large enough to read from arm's length — and that means printing across multiple sheets. drawing-grid generates a multi-page PDF sized to your exact specifications, so you can print a large-format reference on any home or office printer.
You set the size, we handle the rest
Enter your desired physical dimensions — say 60 cm wide — and drawing-grid automatically computes how many pages you need. No manual math, no guesswork. The system scales your image to the exact size and splits it across standard sheets.
Grid, B&W, and crop baked into every page
Your grid overlay, black-and-white conversion, and crop are rendered directly into the PDF at print resolution. Every tile lines up perfectly when assembled — the same reference you see on screen, ready for the easel.
Studio-ready at any scale
Print on standard A4 or US Letter paper with configurable margins and overlap for easy assembly. Whether your canvas is 30 cm or 2 metres wide, you get a reference sheet that matches it exactly — no scaling in the print dialog.
Ready to print your next reference sheet? Open the tool
See the light before you paint
Watercolor is a light-first medium. Every wash is permanent, white paper is your brightest value, and there is no going back once pigment hits the surface. That is why professional watercolorists start every painting with a value study — a quick map of light, mid-tone, and shadow.
drawing-grid automates this workflow. Convert your reference photo to grayscale to strip away the distraction of color, then posterize — starting from just 2 values for a bold light-versus-dark study, up through 3, 4, or more steps as you add nuance. Instantly you can see where to preserve the white of the paper, where to lay a gentle mid-tone wash, and where to commit to rich darks. No guesswork, no surprises.
Add the square-cells grid and you have a complete transfer guide: accurate proportions and a clear value plan, ready to scale to any sheet of watercolor paper. It is the same technique used by Albrecht Dürer and Leonardo da Vinci, taught in ateliers and university painting programs worldwide — just faster and entirely digital.
Focus on one cell at a time
Click any grid cell and everything else fades away. Focus Mode isolates a single cell so you can study its shapes, values, and edges without visual noise from the rest of the image.
When transferring a complex scene — a busy landscape, a portrait with subtle value shifts — it's easy to lose your place or get overwhelmed. Focus Mode narrows your attention to one manageable square, the same way covering your reference with a viewfinder card works at the easel.
Enable the grid overlay, turn on Focus Mode in the grid settings, and click any cell. Click another cell to move your focus, click the same cell again to deselect, or press Escape to see the full image. Pan and zoom still work while a cell is focused.
Try Focus Mode now
Your reference, full screen at the easel
Most drawing grid tools force you to work around browser chrome, toolbars, and sidebars when you just need to see the image. Full-Screen Reference Mode strips away every distraction — your gridded, cropped, black-and-white reference fills the entire display. Set up your photo on a laptop or tablet, tap one button, and prop the screen next to your canvas. Nothing between you and the reference.
This matters because working from a reference photo is a physical activity. Your eyes dart between the screen and the painting surface hundreds of times per session. Every pixel of visible toolbar is a pixel that is not your subject. Full-screen mode gives you the largest possible image at the highest possible contrast — especially valuable on smaller tablet screens where space is at a premium.
All your settings carry over automatically. Grid overlay, B&W conversion, tonal value view, focus mode highlights — everything renders exactly as you configured it, just bigger. A subtle exit hint fades in when you move the mouse or tap the screen, then disappears after a few seconds so it never blocks your reference. Press Escape or tap the close button to return to the full editor whenever you need to adjust.
Try Full-Screen Reference Mode
Turn any photo into a line drawing — instantly
Edge Detection converts your reference photo into a clean outline drawing — just the essential contours, no colour, no tone. One click in the sidebar and Sobel edge detection traces every significant edge, producing a line drawing from your photo that reveals the underlying structure of the composition.
Use it to study how shapes interlock before committing paint to canvas. Print the line drawing, lay it on a lightbox, and trace the key contours directly onto your paper or canvas — a print-and-trace workflow that saves hours of preliminary drawing. Or simply switch between the full reference and the edge view to sharpen your eye for where values shift and forms begin.
Toggle edge detection on with one click. A sensitivity slider controls how fine or bold the detected edges appear — dial it up for every subtle contour, or pull it back to capture only the strongest lines. Choose light lines on a dark background or dark lines on light, whichever suits your tracing workflow. Your grid overlay and other settings resume the moment you switch back.
Try Edge Detection
Who uses drawing-grid?
Watercolor & acrylic painters
Plan your values before the first wash. Convert to grayscale, posterize to see light and shadow, then overlay the grid to transfer proportions accurately. Watercolor is unforgiving — white paper is your lightest value — and acrylic dries fast, so a clear value map saves costly repainting.
Oil painters
Oil painting rewards careful composition and accurate proportion transfer. Use the grid to block in your drawing confidently, then rely on the B&W value study to plan your underpainting — whether you work alla prima or in glazed layers.
Pencil & charcoal artists
The grid method is the classic proportional drawing technique for pencil and charcoal work. Use edge detection to see contour lines clearly, then transfer cell by cell with numbered grid labels. Ideal for portraits, figure drawing, and detailed still lifes.
Art students
The grid method teaches you to see shapes and values, not symbols. Use it to practice observational accuracy — compare what you draw in each cell against the reference. It builds the proportional eye that freehand drawing demands.
Hobbyists
Just want to capture a likeness quickly? The grid breaks any composition into manageable squares — ideal for portraits, landscapes, and still lifes. No art degree needed, just a reference photo and the patience to work one cell at a time.
Also used by tattoo artists, illustrators, and photography students.
Is grid drawing cheating?
The grid method is not a shortcut — it is a centuries-old studio technique. Albrecht Dürer built physical grid frames to study perspective in the 1500s. Leonardo da Vinci used proportional transfer methods throughout his career. Chuck Close scaled his monumental portraits square by square. The technique is taught today in ateliers, university painting programs, and art schools worldwide.
A grid does one thing: it helps you see accurate proportions. It does not draw for you, mix your colors, or make compositional decisions. What it does is free you to focus on painting — on value, edge quality, and brushwork — instead of spending hours measuring and re-measuring. Masters have always used the best tools available to them. The grid is one of the oldest, and one of the most honest.
Common questions
What is the grid drawing method?
The grid method is a proportional drawing technique used by artists for centuries. You divide a reference photo into equal grid squares, then replicate each square on your canvas one at a time. By focusing on shapes and values within each small square (rather than the whole image), you draw what you actually see — not what you expect to see. Artists from Leonardo da Vinci to Chuck Close have used it.
Is drawing-grid free to use?
Yes — completely free. No account, no subscription, no installation. It runs entirely in your browser.
Does my photo get uploaded to a server?
No. Your image never leaves your device. All processing happens locally using your browser’s built-in Canvas API. We never see your files.
What image formats does it support?
JPG, PNG, and WebP. Most reference photos from your camera or the web will work without any conversion.
Does it work on iPad or mobile?
Yes — drawing-grid works in any modern browser including Safari on iPad, Chrome on Android, and Firefox on desktop. No app download needed.
How does this help with watercolor painting?
Watercolor is painted light-to-dark, so you need to plan your values before the first wash. Convert your reference to grayscale and posterize to three values to see exactly where to preserve white paper, add mid-tone washes, and commit to darks. The grid then ensures accurate proportions when you transfer the composition to your watercolor paper. It is the same three-value study technique taught in ateliers — just faster and digital.
Does it save my work?
Yes — drawing-grid auto-saves your session to your browser’s localStorage. Close the tab, come back later, and pick up exactly where you left off. No account needed.
Can I enter my physical canvas size?
Yes. Enter your canvas dimensions in inches or centimetres and the grid cells will show their physical size (for example, "5 × 5 cm"). This helps you plan the transfer accurately so every square on your reference maps to a measured square on your painting surface.
Does it work for pencil, charcoal, or oil painting?
Absolutely — drawing-grid is designed for any medium. Watercolorists use the B&W conversion and posterization for value studies. Oil and acrylic painters use the grid for accurate proportion transfer and can paint right over the grid lines. Pencil and charcoal artists use edge detection for contour guidance. The tool adapts to however you work.
Grid your next painting.
Free, browser-based. Works on any device with a modern browser.
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