Storyboard template, A3
Widescreen frames three across on A3, which is the size storyboards get pinned up at.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
A3 is the size boards get read at
Storyboards exist to be looked at by several people at once, usually on a wall. A4 works for drawing and fails at that, because two people cannot read it together and a sequence pinned up in A4 sheets is mostly white space and staples. A3 holds enough frames to show a sequence and stays legible from a few feet away, which is the actual working requirement.
Shoot the aspect ratio you will actually shoot
A frame drawn at the wrong ratio misleads everyone downstream. Composition that works in a squarish box falls apart in 16:9, because heads end up badly placed and the empty space you were relying on either appears or vanishes. Use 4:3 for archival and some broadcast work, and 9:16 for anything going to a phone.
Annotate or the board gets reinterpreted
The lines under each frame carry shot type, camera movement, rough duration and any dialogue or sound cue. None of that is visible in a drawing, and a board that is all picture gets reinterpreted on the day, which is precisely what boarding was supposed to prevent. Three frames across on A3 still leaves room to write properly under each one.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.