The Screen-to-Print Disconnect
Designing a document on a screen is fundamentally different from manufacturing it on a commercial printer. On a screen, edge-to-edge color is simple. In the real world, printers cannot reliably print all the way to the very edge of a sheet of paper. The paper shifts as it moves through the machine, and the blades that trim the paper are not microscopically accurate.
What is a Bleed?
A "bleed" is the area of your design that extends past the final trim size of your document. If you want a blue background to go all the way to the edge of the physical page, you must extend that blue background into the bleed area (usually 0.125 inches or 3mm past the edge). When the printer cuts the paper down to its final size, they cut *into* the bleed, ensuring there are no ugly white slivers on the edge of your page.
Safe Zones and Margins
Just as the trimmer might cut a millimeter too far out, it might also cut a millimeter too far in. The "Safe Zone" is the inner boundary where you must keep all critical text and logos. If you place text outside the safe zone, it risks being chopped off.
PDF Print Optimization
When exporting PDFs for print, always ensure your design software is set to include crop marks and bleed data. If you have an improperly formatted PDF, utilizing a PDF Resizer tool to inject proper margins before sending it to the print shop can save you hundreds of dollars in ruined runs.