Online Drawing Canvas - Sketch, Annotate, Export
A blank canvas that opens instantly with no sign-up. Sketch an idea, mark up a screenshot, or work something out visually, then export a PNG. Nothing is uploaded or saved to a server.
The best online drawing tool free for annotations
A canvas that opens instantly
Most of the time you want to draw something, the drawing itself takes thirty seconds. Circling the broken element on a screenshot, sketching a layout to explain it to someone, working out a seating plan, marking which window is leaking. The friction is never the drawing, it is everything around it: opening heavy software, creating an account, choosing a template, picking a save location.
This is the opposite of that. The page loads with a blank canvas and drawing tools already available, and the export is a PNG you can paste straight into a ticket, a chat, an email or a document. Nothing is created in a cloud account you will later have to find again.
It suits annotation particularly well. Marking up a screenshot with arrows and circles is the fastest way to make a bug report unambiguous, and doing it in the browser means no round trip through a desktop editor. It works equally well for the throwaway visual thinking that normally happens on paper: rough diagrams, quick wireframes, explaining a shape to someone, anything where the sketch is a means rather than an artefact.
Because everything stays in the browser, nothing is uploaded and nothing is stored. That is worth knowing when you are annotating a screenshot of internal software, an account page, a medical letter or anything else you would not want sitting in a third party's asset library. The flip side is that closing the tab clears the canvas, so export anything you want to keep.
How to use the drawing canvas
- Start drawing. The canvas is ready as soon as the page loads.
- Pick a colour and brush size. A thick, high-contrast stroke reads best for annotation; something finer suits sketching.
- Work at the size it will be viewed. Annotations that look clear on a large canvas can become illegible once the image is embedded in a document.
- Export as PNG. Ready to paste into a ticket, chat or email.
Export before you close the tab, since the canvas is not saved anywhere. For structured diagrams with proper boxes, arrows and layout, the diagram maker and Privacy Sketch produce far tidier results than drawing shapes by hand.
Frequently asked questions
Do I need an account?
No. The canvas is ready as soon as the page loads, with nothing to sign up for.
Is my drawing saved anywhere?
No, and that cuts both ways. Nothing is uploaded or stored on a server, which is useful when annotating internal screenshots, but it also means closing the tab clears the canvas. Export anything you want to keep.
Can I annotate a screenshot?
Yes, and it is one of the most useful things to do here. Arrows and circles on a screenshot make a bug report unambiguous in seconds.
What format does it export?
PNG, which pastes directly into tickets, chat, email and documents.
Can I make proper diagrams with it?
For structured diagrams with boxes, arrows and automatic layout, the diagram maker or Privacy Sketch give much tidier results than freehand drawing.
Does it work on a tablet or with a stylus?
Yes. The canvas accepts touch and pen input as well as a mouse.
🔎 Verify it yourself: nothing uploads
Don’t take our word for it. Open your browser’s DevTools (F12 → Network tab), then run this tool on any image. You’ll see no upload request at all — your file never leaves this tab. You can even turn off Wi‑Fi once the page has loaded and keep working. Every tool on this site works the same way — all processing happens on your device.