PDFs

Read, highlight and annotate — then put the passage on the wall.

Drop a PDF on the canvas and the card becomes the first page. Open it for a real reader.

A PDF open in Umbra's reader with two highlights listed in the annotation rail

Reading

Continuous, single-page and two-up. Zoom is a multiplier on fit, not an absolute scale — so 120% means the same thing for A4 and for a slide deck.

Marking up

Select text and choose a highlight colour, or leave a comment. Everything you mark appears in the rail on the right, in reading order.

Add to canvas

Any annotation can be placed on the board as a pointer — a small card carrying the quote, which double-clicks back to the page it came from. Put it beside the diagram it explains.

The two directions differ, and the difference is deliberate:

You deleteWhat happens
The pointer on the canvasOnly the pointer. The highlight stays on its page, and the rail offers Add to canvas for it again
The highlight in the readerIt goes, and every pointer to it goes with it — one undo brings them all back

A pointer is a placement of an annotation; the annotation is the thing itself. Removing a placement must not destroy the source, and destroying the source must not leave cards pointing at nothing.

Editing pages

Under Advanced: reorder, rotate and delete pages, place an image, and sign. Nothing rewrites your original file — every change is a list of edits replayed on render, and baked in only when you Save a copy.

Placing an image snaps to the page's own centre, edges and margins, and you can drag it after dropping it.