Why are they important?
Crops and bleeds ensure the quality of your printed document.
When you create a document that will be printed, crops and bleeds are essential elements to ensure that your final document retains a professional look. This is why printers require crops and bleeds notifications to ensure a professional look to your printed document. There are a number of desktop publishing tools that can be used to manage crops and bleeds accurately.
The most popular tool to design brochures is Adobe InDesign. It is one of the leading Desktop Publishing Applications. It can setup crops automatically for you when converting them into a PDF file format. You can check the crops and bleed options under the Document Menu where you can find options for page size, margin and bleed. Adobe InDesign is published by Adobe.
Another leading tool in the DTP space is QuarkXpress published by Quark. Quark has different versions depending on the type of language you are translating into. There are different versions for Arabic and Chinese so you need to be aware of this if you plan to translate Quark documents into these languages.