Gaps sometimes appearing between 2D sprites

I found an answer to this issue that solved it for me, turn off Anti Aliasing in Edit -> Project Settings -> Quality.

It might not be the solution for everyone, but it worked for the issue I had.

We had this same problem in our project (as I posted before) and eventually fixed it by adding a bleed zone of one extra pixel on each side of each sprite on our sheets. Unity will, as mentioned by others, sometimes display one extra pixel beyond the defined zone on the spritesheet. If that pixel is transparent, it will create gaps (or, depending on the spritesheet, cause other undesirable bleed-over from sprites not meant to be adjacent).

This could be happening because your sprite sheet has a transparent background. When the camera moves or zooms in/out some pixels outside of your sprite's region can show up due to inaccuracies.

Change your sprite's texture type to advanced, then you can change the format to RGB 24 bit. Now your sprite sheet no longer has a transparent background.

finally fixed a similar issue on my own project. It was down to the camera orthographic size!

here are the steps I followed to solve this: - make sure you are using point filtering - use power of 2 textures - adapt the screen resolution and the camera orthographic size to prevent floating point imprecision (see rocket5 tutorial and related post) which helped me find the right formula.

I was using a tiling method to build levels with sprite rendered prefabs. When I created the generic sprite-diffuse material so the light would work, I had turned on the "pixel snap" option (I'm not sure why... seemed like a good idea at the time?) This was causing gaps between all the tiles even when nothing was moving in any way, in fact, it did this even without the lighting effect.