Every DM has been there: you want to show the party a letter, a wanted poster, a map fragment, or a portrait of the NPC they just met. You pull it up on your laptop, turn the screen around, and they see your forty open tabs, the stat block for the boss fight, and the note that says "if they go left, TPK." The handout viewer exists to solve exactly this problem.
What makes a good handout
The best handouts are images that tell a story by themselves. A water-stained letter with a wax seal. A crude map drawn by an NPC who has never seen the dungeon from above. A bounty poster for one of the PCs. A sigil carved into a door. These do not need to be high art, they need to be atmospheric. The handout viewer handles the presentation; you handle the content.
Fullscreen for maximum effect
The fullscreen button uses the browser's native Fullscreen API to fill the entire screen with nothing but the handout and the background colour you chose. No scrollbars, no address bar, no bookmarks toolbar. On a TV or projector, this creates a cinema-quality reveal moment. On a tablet passed around the table, it turns the device into a prop.
Background and rotation
Dark background works best for most handouts, it frames the image and hides the screen edges on a TV. Light background helps when the handout itself is dark or the room is dim and you want the screen to feel warm rather than imposing. Rotation handles the common case of portrait-oriented handouts on a landscape TV: rotate 90 degrees and the letter fills the screen properly.
Pairing with other tools
The handout viewer pairs well with the fog of war tool and the upcoming tabletop display. Use the fog tool to manage the battlemap reveal, and switch to the handout viewer when you need to show the party a close-up of a clue, a letter, or a portrait. Since both tools run in the same browser, switching takes seconds.