Draw online on a smooth, endless board
A plain drawing board for doodles, diagrams and handwriting. Pick a marker and go; your drawing saves itself in this browser.
Why a wobbly hand still gives a clean line
Your browser doesn’t hand over a continuous line. It reports the pointer’s position a few dozen to a few hundred times a second, and a drawing app has to decide what to draw between those dots.
Straight segments are the naive answer: connect dot to dot. Move quickly and the gaps get long, so curves turn visibly angular. Midpoint curves fix that by drawing a quadratic Bézier from the midpoint of one pair of samples to the midpoint of the next, using the sample itself as the control point. The result passes smoothly through every corner with no sharp kinks.
When you lift the pen, SketchWith also runs Ramer–Douglas–Peucker simplification: it keeps the points that stray furthest from a straight line between their neighbours and drops the rest. Slide the tolerance up and watch how many points you can remove before the shape visibly changes. Boards stay small enough to autosave, and the line doesn’t get worse.
Tips for drawing with a mouse, finger or pen
- Draw slowly for handwriting. Slower strokes mean more samples per letter and crisper curves.
- Zoom in for detail. Pinch or Ctrl + scroll to 200–400% for small lettering; line widths stay the same on screen, so fine work gets easier.
- Hold Shift with the line or shape tools to get 45° angles, perfect squares and circles.
- Use the highlighter over ink to shade areas without hiding what’s underneath.
- Need a grid to draw to? Switch paper to dots or grid from the paper menu, or use the graph paper board.
- Want it rendered properly? Take your sketch to sketch to image and let an AI model finish it.
Questions people ask
Can I draw online for free without downloading anything?
Yes. This drawing board runs entirely in your browser. There is no app to install, no account and no watermark on exports.
Does it support Apple Pencil and drawing tablets?
It uses Pointer Events, so an Apple Pencil, Surface Pen or Wacom tablet draws like a mouse or finger. Where the browser offers coalesced events, every intermediate sample between frames is captured, which keeps fast strokes from turning into polygons.
Why do my lines look smoother than what I actually drew?
Each stroke is drawn as a chain of quadratic curves through the midpoints of the sampled points instead of straight segments, and the point list is thinned with the Ramer–Douglas–Peucker algorithm when you lift the pen. The explainer on this page lets you see both steps.
How do I save my drawing?
It autosaves in your browser. To keep a file, open the export menu and choose PNG (transparent-free, with the paper background) or PDF. Save board file keeps it editable.
Is there pressure sensitivity?
No. Strokes have a fixed width chosen from four sizes. That keeps lines consistent for diagrams and handwriting, which is what most people use a drawing board like this for.