How do I draw a double bond?

With the bond tool chosen, pick the double bond in the options above the toolbar, then draw.

How do I change carbon to another element?

Point at the atom and type the element’s letter, such as O, N or S.

Can I save my drawing?

Download it as MOL, PNG or SVG, or open it in Athanor, where documents save themselves.

Draw a molecule

Free, no sign-up. Athanor’s editor runs in your browser, and your drawing never leaves your device.

Loading Athanor’s editor

The drawing basics. Templates, arrows, mechanisms, 3D and the AI assistant are in the full editor.

SMILES

Draw something: pick the bond tool and drag on the canvas.

How to do it

Pick the bond tool and drag on the canvas; the options above the toolbar set the kind of bond.
Change an atom by pointing at it and typing its letter, such as O or N.
Copy the SMILES, or save the drawing as MOL, PNG or SVG.

The same editor as the full app

This is Athanor’s own editor with a short toolbar: bonds, rings, charges, text and the eraser. The keyboard works as in the full app: a tool’s letter switches to it, an element letter with the pointer on an atom changes that atom, and Delete, Ctrl+Z and Ctrl+Y do what they say. Every edit is valence-checked as you draw.

For schemes, mechanisms, journal styles and the rest, open the drawing in the full editor; it carries the structure over.

Questions

Related tools

Do way more cool things with Athanor, for free.

Get it on Microsoft Store

Windows 10 and 11 Updates itself from the Store

Open in browser

Runs in your browser. No account needed to draw.