Online Drawing Board

No, and there is nothing in the page that could. The board is a canvas element sitting in your own tab, painted by JavaScript running on your machine, and no request is made when you save either — the image becomes a data URL, gets hung on a link element and is clicked in code, so the file goes straight to your downloads folder without leaving the device. The undo history is a stack of bitmaps held in that same tab's memory. There is no account and no upload step, which also means nobody can recover the drawing for you once the tab is gone.

Not from a sheet that has been painted white, and this one is filled with white before you touch it. PNG does support transparency — it carries an alpha value per pixel — but that has to be preserved from the start, which means never filling the background and erasing by clearing pixels rather than painting over them in white. Since the board does the opposite, the saved file is opaque throughout. To lay a sketch over a photograph, remove the white in an editor afterwards, and expect a pale fringe around every stroke where the anti-aliased edges were blended against the background they were drawn on.

Rarely, and the arithmetic is quick. The board is 480 pixels tall whatever your screen, and print is usually fed at 300 pixels per inch, putting that height at about 1.6 inches — a little over four centimetres on paper. At 150 dpi, acceptable for a rough internal handout, you get about eight. The width is better, since it follows the width of the panel, but the proportion is fixed. Enlarging the image in a printer dialog adds no detail; it makes the pixels bigger and the edges softer. Anything that has to print at a real size wants to be drawn as vectors instead.

It will draw, yes. Pointer events are a single API covering mouse, touch and pen, so an Apple Pencil, a Wacom tablet or a bare finger all reach the page the same way, with no driver or special mode involved. What a pen normally buys you is the extra data it reports — pressure, tilt, sometimes barrel rotation — and a page has to read those deliberately to do anything with them. This one does not, so a hard press and a light one give the same line, and thickness comes only from the Size slider. If varying stroke weight is the point of the drawing, a native tablet application is the honest answer.

Because a stroke is not recorded as a curve. The browser reports the pointer's position periodically, roughly once a frame, and the drawing is a straight line from each reported point to the next. Move slowly and those points sit close together, so the joins are invisible. Whip the pointer across the board and the gaps grow, and you see them as flat sections and corners. Rounded joins hide some of it and a thicker brush hides more, since a wide round stroke blurs the angle where two segments meet. Drawing a long curve as one continuous movement, rather than several stabs, does more than anything else.

It depends on whether the drawing is finished. A raster image such as PNG is a grid of coloured pixels: it records how the drawing looked and nothing about how it was made, so no line can later be selected, recoloured or thinned, and enlarging it enlarges the pixels. A vector file such as SVG stores strokes as maths, scales to any size cleanly, and keeps every line as an object you can edit. Vectors suit logos, icons, diagrams and anything heading for print at an unknown size. Pixels suit a quick explanatory sketch that is going into a message and will never be reopened.

Not here — this is one canvas in one tab with no network connection behind it, so there is nothing for a second person to join. Shared whiteboards look similar and are a far larger piece of engineering: a server holding the document, a channel streaming each stroke to everyone else within a few tens of milliseconds, and a rule for what happens when two people edit the same region at once. That is why the collaborative ones ask you to sign in and the solo ones do not. If you only need somebody to watch you draw, sharing your screen on a call you are already in is quicker.

A mouse is a poor pen because your wrist is making a different movement from the one it knows, and a trackpad is worse because the contact keeps breaking. Some things genuinely help. Draw from the elbow in one confident sweep — hesitation shows up as wobble, speed does not. Use a bigger brush, since a thick stroke hides tremors that a one-pixel line advertises. Build a long curve from a few long strokes rather than many short ones. Use undo freely, because a bad stroke is cheaper to redo than to patch. If you draw often, even an inexpensive graphics tablet changes the job entirely.