Athanor by arbastro
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Where your work is saved

There is no save button. Every change is kept as you make it. Signed in, documents also sync to your arbastro account and appear on every device in Home. To send a file to someone, use Export or File › Download as .athanor.

On a Mac, Ctrl is Cmd.

Every change is kept

Athanor saves as you work. There is no Save command and nothing to lose by closing a tab: the document stays in Home, under Recent, with the time you last edited it.

Home listing four saved drawings under Recent, and the storage box at the bottom left.Home listing four saved drawings under Recent, and the storage box at the bottom left.

Signed out: this device only

Without an account, documents are kept in this browser, or in the desktop app on this computer. The box at the bottom left of Home says how many documents are on this device and how much space they use.

Warning

A browser can clear its stored data when the disk runs low, and clearing your browsing data deletes it too. Signed out, Home warns you when documents are not backed up. Sign in, or turn on Automatic backup, to keep a copy elsewhere.

Signed in: your account and every device

Sign in with your arbastro account and your documents are kept in your account as well. They appear in Home on every device you sign in on, in the browser and in the desktop app.

Backups

Choose Backups at the bottom left of Home (or File › Backups…) to open Storage & backups in Settings:

  • Automatic backup: Choose a backup folder… and Athanor writes a copy of your documents there.
  • Export everything: every document, downloaded at once.
  • Restore: From files… brings documents back from a backup. Restoring never overwrites a document you already have.

Storage and backups in Settings, with Automatic backup off, Export everything and Restore from files.Storage and backups in Settings, with Automatic backup off, Export everything and Restore from files.

Sending a file

To give someone a copy, open Export (Ctrl+Shift+E) and pick a format such as PNG, PDF, MOL or ChemDraw CDXML. File › Download as .athanor saves the whole document, which opens in Athanor again with everything intact. See Export a figure or structure file.

Earlier versions

Every edit is kept in Version history (Shift+H), so you can step back to how the document looked before. See Version history.

Files and formatsHow to export a figure or structure filePress Ctrl+Shift+E, pick a format (Ctrl-click to pick several), read what it keeps and loses, then press Export or Copy. Export again (Ctrl+Alt+E) repeats the last choice.Collaboration and sharingVersion historyVersion history in Athanor: every edit of the session as pictures you can step back to, and the named versions kept with your account across devices.

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Last updated Nov 12, 2026