White lines in Pattern on Adobe Illustrator

[k80bug_12895]

I've read through a few threads here about white lines in Adobe Illustrator. However, I haven't found any solutions to my particular situation. I created a pattern in Illustrator and there are no visible white lines when I have the file open in the application. Once I export the file to either PNG or JPEG to post to social media, the white lines appear. Does anyone have any helpful hints for this? I'm including a screenshot of my pattern in AI (no visible white lines) and my exported file (visible white lines). Thank you in advance. 

[Jacob Bugge]

k80bug,

When I look at those two I see no visible white lines in either, same when Clicking and seeing full size (1920 x 1200 EIZO monitor).

Are you ensuring whole integer numbers for both sizes and positions?

[Larry G. Schneider · Accepted solution]

They're there but only in the oranges in the second image(vertical line). Definitely an anti-aliasing problem but shouldn't show when printing.

[Jacob Bugge]

Right you are, Larry, one in the middle.

[Ton Frederiks]

Did you modify the default export settings to use Art Optimized for anti aliasing?

[Lisette3073520517cq]

I had the exact same issue - and managed to resolve the issue by making my bounding box in abode illustrator (my solid background colour) just ever so slightly larger - just for jpg social media posts. So to clarify - 

my repeating pattern was on a 12 x 12 inch square - thin white lines not visible in repeating test, but defintely there for jpg saved document. So I created the background square as a 12.03 x 12.03 and tested the pattern - when I saved this version it seemed to resolve the issue. 

Hope it helps you too.