How to use the Grid Method Overlay
- Open a reference. Click Open a reference, drop a photo on it or paste one. The photo stays on your device; nothing is uploaded.
- Set the drawing surface. Pick a standard canvas or paper size under Drawing surface, or type your own Width and Height in inches or centimeters. The tool turns the surface to match your photo’s orientation, and the ⇄ button swaps it back. Choose Same shape as my photo if you would rather size the paper to the photo than crop the photo to the paper.
- Choose the grid. Under Grid by, set a Square size (for example 1 in or 2 cm) or a number of Squares across. A square size that divides the surface evenly is suggested whenever you pick a preset.
- Frame the crop. If the photo and surface have different shapes, the part that will be dropped is darkened. Drag the bright frame, or focus the image and use the arrow keys, to choose what stays; Crop zoom tightens it. The grid you see is the grid that will be on your paper.
- Style and export. Toggle Diagonals, Labels A B C / 1 2 3 and the Contrast halo, pick a line color, width and opacity, then Download gridded PNG. Grid sheet PNG and Grid sheet SVG give the matching empty grid at actual size, with the square size printed in the corner, and Copy summary puts the plan in your clipboard.
When the grid method beats freehand
The grid method breaks one hard problem, copying a whole image at a new size, into many easy ones: copying what happens inside a single square. You draw the same number of squares on your surface as on the reference, then reproduce each square’s contents, using the points where contours cross the grid lines as anchors. Because every square is small, errors can’t accumulate across the picture the way they do when you sight a whole figure at once.
It is an old studio method, not a shortcut invented for beginners. Leon Battista Alberti described a thin veil marked with a grid of threads in his 1435 treatise On Painting, and squaring up was the standard way to enlarge a study to fresco or panel scale for centuries. Today it is the practical choice for murals, commissioned portraits that must look like the sitter, and large canvases where an error of 2% would put an eye a full centimeter out.
Freehand sighting is still worth practicing, and many artists use a coarse grid only for the lay-in and then work freely. The grid gives you placement; the drawing is still yours.
Getting the shape right before the squares
The most common grid mistake happens before a single line is drawn: the photo and the surface have different proportions. A phone photo is usually 4:3, while an 11 × 14 in canvas is 1.273:1 and an A4 sheet is 1.414:1. Stretch the photo to fit and every face gets fatter or thinner; this tool crops instead and lets you choose what to lose. Here is how much of a standard 4:3 portrait photo (3024 × 4032 px) each surface keeps, and the grid the tool suggests:
| Surface | Long ÷ short | Photo kept | Suggested squares | Grid | Photo px per square |
|---|---|---|---|---|---|
| 8 × 10 in | 1.250 | 93.8% | 1 in | 8 × 10 | 378 |
| 9 × 12 in | 1.333 | 100% | 1 in | 9 × 12 | 336 |
| 11 × 14 in | 1.273 | 95.5% | 1 in | 11 × 14 | 275 |
| 16 × 20 in | 1.250 | 93.8% | 2 in | 8 × 10 | 378 |
| 18 × 24 in | 1.333 | 100% | 2 in | 9 × 12 | 336 |
| 24 × 36 in | 1.500 | 88.9% | 2 in | 12 × 18 | 224 |
| A4 (21 × 29.7 cm) | 1.414 | 94.3% | 3 cm | 7 × 9.9 | 407 |
| 30 × 40 cm | 1.333 | 100% | 2.5 cm | 12 × 16 | 252 |
| 50 × 70 cm | 1.400 | 95.2% | 5 cm | 10 × 14 | 288 |
Surfaces with a 3:4 shape (9 × 12, 12 × 16, 18 × 24 in, 30 × 40 cm) take a phone photo whole. A-series paper never divides evenly into round centimeters, which is why the A4 grid ends in a partial row; the tool tells you exactly how wide the leftover column or row is so you can mark it on the paper too. For mixed units, 1 in is 2.54 cm, and switching units here keeps the same physical squares.
Tips from practice
Draw the paper grid lighter than you think. A 2H or harder pencil with almost no pressure, or a water-soluble colored pencil under watercolor, keeps lines from showing through the finished piece. Many artists skip the paper grid entirely and work over a printed grid sheet on a light box.
Use diagonals where the drawing gets busy. Diagonal lines double the number of anchor points in each square. Turn them on for faces and hands, then switch them off for the background, where whole squares are sky or wall.
Label both sheets the same way. It is easy to copy square C7 into D7 when you look up and down 200 times an hour. The A–Z columns and numbered rows match the grid sheet exactly, so write the same labels in the margin of your paper.
Copy shapes, not things. Inside one square, an eye is just a few curves meeting the grid lines at measurable points. Reading it as “the eye” invites you to draw your idea of an eye. Turning the reference and your drawing upside down, or flipping both in the Reference Flip & Grayscale Tool, helps.
Pick the square size by the detail, not the canvas. Each square should hold at most one or two important edges. If a face covers only four squares on a 24 × 36 in canvas, halve the square size or grid just the head more finely.