Hi guys! Happy planning! I've seen a few posts asking for advice about sending files to printers, so I figured I'd offer a little insight for those who might be lurking/researching.
If you are digitally creating your own invitations, after you finalize the design, your best bet is to give your printer a PDF version. There will be less computer-to-computer translation issues between you and your printer. (I'm going to amend this first post with replies below that have tutorials on how to create PDFs in Microsoft programs, in case anyone needs it, as I know that's a popular suite for people who are doing the DIY thing.)
Should you plan to create your own invitations, lean towards programs that are geared toward printed material. In the Microsoft Office suite, stick with Word or Publisher. I can not emphasize enough that you should not use programs like Paint or PowerPoint for your invitations. You can, sure, but I don't recommend it as they are not geared toward printed material for a final product.
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Please do not hesitate to message me if you have any questions or need help with the layout or file finalization of your invitations or other materials. I just want people to get the best results they can with what they've created. I'm a graphic designer, but I'm not selling a service. I just know what it's like to need help and not know where to start. I am more than happy to advise someone or offer assistance for free if they need the help.