Any help with pathfinder maps?

I don't know what it is, but the maps you can copy from Paizo supplements never seem to match up to the Roll20 grid. I use the alignment tool to get the correct measurement on a 3x3 (usually 70/70 or 71/71) but it's always inevitably terrible once you go past the first 'ring' of grids, getting increasingly inaccurate (often being almost an entire tile off) at the edges of the map. Has anyone with any experience of running pathfinder paths on roll20 had this same problem? Has anyone found a solution?

The problem comes from the fact that roll20 grid lines are a pixel or so wide. The pathfinder maps' grid lines are anywhere between 2 and 4 pixels wide and can vary on the same map. What I've found to work best is zoom WAAAAY in on the AP map in gimp or Photoshop until you can see everything at a pixel level. Then measure from the outside of the top and left lines denoting a square to the inside of the bottom and right of the square. This will give you an accurate measure of a square 's width. Once you have that, you can grab the grid less version of it from the map PDF and crop it to the proper size based on its dimensions in squares. The reason you want the grid less version of the image is that there is no way to line it up perfectly since the grid lines are actually different sizes and will continually add extra width/height.

Those maps are made for printing, they are also usually way higher resolution than you need. If you can get a gridless map and drop it's resolution down a bit with PS or Gimp then import it and size it so something, a door, a path, whatever is about the right size you have it. then move it around until your main areas are roughly conforming to the  grid, so people are not going to be in half squares when distance matters the most.

al e. said: Those maps are made for printing, they are also usually way higher resolution than you need. If you can get a gridless map and drop it's resolution down a bit with PS or Gimp then import it and size it so something, a door, a path, whatever is about the right size you have it. then move it around until your main areas are roughly conforming to the  grid, so people are not going to be in half squares when distance matters the most. Ah, if I could get grid-less versions of the maps none of this would be a problem. It's very annoying. Curse of Strahd released grid-less versions of all it's maps, but I'm converting the AP 'Kingmaker' now and the only versions of the maps I can find are the ones you copy/paste from the PDFs - which all have (bad) grids. There's some nice community made maps on RPG Map Share but their size is insane (40megs+) so I can't use them as backgrounds...

Maybe this is something they did in later AP's, but for my iron gods ap, every PDF set came with a map folio that had buttons to turn GM view and the grid on and off. 

Thanks for the help guys. I found a grid-less community made map and used compression to reduce the file size, and it's all working fine. Problem solved (for now!).