Bleed is the extra space around the outside of your document that will be cut off during production. It is an essential requirement in printing. The print bleed can be created as you set up your file. Find the bleed option in your document setup and create at least a 3mm bleed over the document edges. Or you can create your file 3mm larger on all sides. if you are designing an A5 (148.5x210mm) document set your page size to be 154.5x216mm. Ink that prints beyond the trim edge of the page will be cut off. Supplying your job without bleed may result in white lines when we trim it. Don’t forget we will also need a minimum of a 3mm safe zone (or ideally 5mm) from the cutting edge.
What is the safe zone I here you ask. The safe zone is the area inside the trim line of your print job that shouldn't contain anything important such as text, images or logos. If you stick to the rules and use a safe zone, you can rest assured that your important information won't be affected in the trimming process. The safe zone should be least 3mm (ideally 5mm) from the trimmed edge of your artwork. This will give your job a more professional appearance.
For booklets, we recommend a 5mm (ideally 10mm) safe zone for a better finish.