Make a custom worksheet printer

What you'll build: the engine behind our Handwriting Help tool, a page where you type words, choose the line style and how much tracing help, and print a crisp practice sheet at real school sizing.

Who it's for: any parent. This is the gold-standard starter project: it's visual, it prints something real your child holds in their hand, and the print trick you'll learn works for any worksheet tool you build later.

Before you start

Open a free AI-assisted editor (v0.app, Claude, or Cursor). You'll describe the page in plain English. The whole thing runs in the browser. no server, no account, no cost.

Jargon, defined once: a guideline is the set of lines a child writes between (the top "sky" line, the dashed middle, the "grass" baseline). Faded trace means printing the letters in light gray so the child traces over them, then fading them out as they improve.

Step 1. Describe the page

Build a single-page handwriting worksheet maker. Left side: a control panel. Right side: a live preview of an 8.5×11 inch sheet. A text box lets me type the words to practice. A "Print" button prints only the sheet (no controls). Clean, calm design. No login.

Step 2. Draw the guideline rows

Each practice row is three horizontal lines: a top line, a dashed middle line, and a heavier baseline, evenly spaced. Let me set the row height in millimetres with a slider (6mm to 12mm). Stack as many rows as I ask for.

Step 3. Place the letters on the lines

Render my typed text sitting on the baseline of each row, sized to fill the space between baseline and top line. Repeat my text on every row.

Step 4. Add the fade slider

Add an "opacity" slider from 15% to 100%. At 100% the letters are solid black (easy tracing); at 15% they're faint (almost writing from scratch). This lets one tool scaffold from full support down to independence.

Step 5. Add the color guideline option

Add a toggle "color lines". When on, the top line is sky-blue, the middle dashed line is yellow, and the baseline is green. When off, all lines are light gray. (Color helps young kids aim each part of the letter.)

Step 6. Let me control the amount

Add a slider for number of rows (3 to 12) and a text field for the child's name, printed small at the top of the sheet.

Step 7. The print trick (this is the important one)

This is what makes worksheet tools work, and it's worth learning once:

When I press Print, hide everything except the sheet. Use a CSS print stylesheet: put the controls in a container with class no-print and add @media print { .no-print { display: none } }. Set the sheet itself to exactly 8.5in wide so it fills one page.

@media print {
 .no-print { display: none !important; }
 .sheet { width: 8.5in; margin: 0; box-shadow: none; }
}

Step 8. Polish the defaults

Set sensible defaults so it's useful on first load: text "The quick brown fox", 10mm rows, 6 rows, 40% opacity, color lines on. A parent should be able to print something good without touching a single control.

Test it

Type a few letters your child is working on. Drag the fade slider, the letters should go from solid to faint. Press Print and check the preview: you should see only the sheet, full page, no buttons. Print one and have your child try it. If the lines feel too big or small, that's your row-height slider. adjust and reprint.

The one guardrail to add before your child uses it

Cap the dose, not the page. It's tempting to print ten rows because the tool makes it easy. Add a gentle note on the sheet. "5 minutes of careful letters beats a full page of rushed ones", and default to fewer rows. Handwriting is a motor skill; short, accurate, daily practice wins. Build that message into the tool so it nudges toward less, not more.