Import / Export

Open the menu (☰ icon, top-left) for every import/export option.

Exporting

Save as .excalidraw (JSON) — saves your whole drawing as a .excalidraw file (plain JSON under the hood). This is the format to use if you want to re-open and keep editing the drawing later, or hand it to someone else using DrawBoard (or real Excalidraw — the formats are compatible for elements). See Saving Your Work.
Export as PNG (1x) — a standard-resolution image with your canvas background included.
Export as PNG (2x, transparent) — a sharper, higher-resolution image with a transparent background — good for pasting into slides or documents.
Export as SVG — an SVG file version of your drawing.
Copy to clipboard as PNG — copies the drawing as an image directly to your clipboard, ready to paste into another app (Slack, Docs, an email) without saving a file first.

Open .excalidraw file… in the menu lets you pick a previously-saved .excalidraw file from your device and load it onto the canvas.

Importing replaces what's currently on the canvas. If you have unsaved work you want to keep, export it first.

(Screenshot suggestion: the ☰ menu open showing all export options.)