How To Get Seamless Tiles

I have seen pictures of people using Tiled in order to make maps filled with seamless tiles. However, I downloaded some tiles online and they all have thin lines in between each tile. So, I tried to make my own and ended up with the exact same results. Here is what the lines in between the tiles look like. Any recommendations??


If your tiles have anti-aliased (smooth) edges, this problem can occur because the semi-transparent pixels allow the tiles behind to be visible when they shouldn’t be. This can be fixed by extending the tiles upward slightly (so that there is proper overlap), or by having aliased tile edges and having anti-aliasing only on those parts that protrude from the tile.