How to Set Crop and Trim Marks in Illustrator

The interchangeable terms "crop marks" and "trim marks" point to short line segments arranged at the corners of a printed piece of artwork to define where to trim away the outer edges of the paper, leaving only the artwork behind. Most graphics software, including Adobe Illustrator, provides features and functions that automate the placement of these marks so you don't have to create them manually. Illustrator's artboards -- the page-like areas on which you draw -- define the printable area of your artwork, but crop marks only provide guides for hand trimming or commercial print production.

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Crop marks show where to trim off excess paper around a completed design.
To add trim marks to a composition, select your artwork first.

Press "V" to switch to the Selection tool. Click on or marquee around an object or set of objects to make them the active selection in your Adobe Illustrator file. To include an object that you've hidden or locked, press "F7" to reveal the Layers panel, twirl open the disclosure triangle for the layer that contains the artwork, and turn on the visibility eyeball or click off the padlock icon that denotes an object's status.

Create editable trim marks from the Adobe Illustrator Object menu.

Open the "Object" menu and choose "Create Trim Marks" to display an editable set of corner marks at the four corners of the invisible bounding box that defines the overall height and width of your artwork.

Adobe Illustrator's automatic crop marks remain editable.

Click on or marquee around the crop marks to edit or delete them. To hide them the same way you would hide any Adobe Illustrator object, select them and press "Ctrl-3."

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