Before printing or handing off the document to a service provider, you can perform a quality check on the document. Preflight is the industry-standard term for this process. While you edit your document, the Preflight panel warns of problems that can prevent a document or book from printing or outputting as desired. These problems include missing files or fonts, low-resolution images, overset text, and a number of other conditions.
You can configure preflight settings to define which conditions are detected. These preflight settings are stored in preflight profiles for easy reuse. You can create your own preflight profiles or import them from your printer or another source.
To take advantage of live preflighting, create or specify a preflight profile in the early stages of creating a document. If Preflight is turned on, a red circle icon appears in the status bar when InDesign detects any problems. You can open the Preflight panel and view the Info section to get basic guidance for fixing the problems.