What a vector PDF is
A vector PDF is made directly from design software. Each line is stored as an object with exact end points. Text is usually stored as text. When you zoom in, the lines stay sharp.
What a scanned PDF is
A scanned PDF is made from a paper sheet or an image. The file holds dots, not lines. When you zoom in, the lines turn soft or blocky. The file has no text to search unless someone ran character recognition on it.
How to tell which one you have
- Zoom far in on a line. A sharp line means vector. A blurry line means a scan.
- Try to select one word on the sheet.
- Search for a word you can see, such as a room name.
Some vector files store text as shapes. The lines are sharp, but a search finds nothing. Treat the text in those files like a scan.
Why it matters for a takeoff
- Measuring. Tools can snap to the end of a vector line. On a scan you place each point by eye.
- Scale. A scan can be stretched or tilted. Check the scale in both directions.
- Search. You can search a vector set for a tag or a keynote across all sheets.
- Reading errors. Character recognition can read a 3 as an 8 in a schedule.
- AI reading. Software reads both kinds, but a poor scan gives weaker results.
What to do with a scanned set
- Ask the plan room or the architect for the original PDF files.
- Check the scale on every sheet against a printed dimension.
- Read the schedules yourself.
- Treat software counts from scanned sheets as not verified until you check them.
AI and takeoff software · Updated 11 Nov 2026