# Can someone explain what is a pdf annotation in simple terms?

**URL:** <https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45>\
**Category:** Editors\
**Tags:** speedruns\
**Created:** [October 29, 2026, 3:05pm UTC](https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45 "2026-10-29T15:05:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hiking\_mouse](https://www.spacequbegame.com/letter_avatar_proxy/v4/letter/h/bbe5ce/32.png) [@hiking\_mouse](https://www.spacequbegame.com/u/hiking_mouse)\
**Post date:** [October 29, 2026, 3:05pm UTC](https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45/1 "2026-10-29T15:05:30Z")

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I keep seeing the word annotation in PDF apps and I’m not sure if it means comments, highlights, or something else. I’m reviewing a scanned lease on my phone and just want a simple explanation before I start marking it up.

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**Author:** ![ClumsyRed](https://www.spacequbegame.com/letter_avatar_proxy/v4/letter/c/e9c0ed/32.png) [@ClumsyRed](https://www.spacequbegame.com/u/ClumsyRed)\
**Post date:** [October 29, 2026, 3:05pm UTC](https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45/2 "2026-10-29T15:05:50Z")

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had the same thing last month looking at a lease. tbh annotation just means extra marks you add on a pdf like highlights, comments or drawings. it sits on top so the original scan doesn’t change. on my phone i just tap in the usual viewer to add them.

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**Author:** ![guitar\_fan](https://www.spacequbegame.com/letter_avatar_proxy/v4/letter/g/a88e57/32.png) [@guitar\_fan](https://www.spacequbegame.com/u/guitar_fan)\
**Post date:** [October 29, 2026, 4:49pm UTC](https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45/3 "2026-10-29T16:49:17Z")

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A PDF annotation is anything added on top of the original page, such as a comment, highlight, drawing, or stamp. Tip: save a copy before marking up the lease. Avoid uploading it to an unfamiliar app since leases contain personal information.

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**Author:** ![amy\_celtic](https://www.spacequbegame.com/letter_avatar_proxy/v4/letter/a/d07c76/32.png) [@amy\_celtic](https://www.spacequbegame.com/u/amy_celtic)\
**Post date:** [October 29, 2026, 5:19pm UTC](https://www.spacequbegame.com/t/can-someone-explain-what-is-a-pdf-annotation-in-simple-terms/45/4 "2026-10-29T17:19:17Z")

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Annotation just means any markup sitting on top of the PDF, so comments, highlights, sticky notes, underlines, even stamps. The original scanned text underneath never changes, you’re just adding a layer on top.

1. Use whatever annotation tool your phone’s default PDF viewer has, Apple’s Preview/Markup or Google’s built in viewer both do highlights and notes fine for a lease.
2. Don’t flatten or merge annotations into the file until you’re totally done, keep them editable in case you spot a mistake later.

Also keep a backup copy of the original scan before you start, scanned leases are a pain to get again if you muck it up.