How To: Increase the character length for a text field in ArcMap
In some scenarios, users may want to modify the character length of an existing text field in an attribute table to include a longer name, such as a hyperlink. A hyperlink may not work in a field with a default length of 50 characters.
Users cannot increase the character length of an already existing text field. An example error message may appear when trying to edit a field value beyond the length allotted:
However, users can create a new text field with a length of 255 characters, and set the new field to mirror the properties of the original field. Instructions provided describe how to create a new text field in an attribute table to increase the character length allowed.
- Add a new text type field in the attribute table. To do this, refer to the following ArcGIS Web Help topic: Adding fields
- In the Add Field dialog box, after selecting the field type Text, input 255 in the Length box and click OK.
- Click the Editor menu on the Editor toolbar and select Start Editing.
- Right-click the new field and select Field Calculator.
- In the Field Calculator dialog box, double-click the required field name from the Fields list to enter the name into the expression box, and click OK.
- Go to the Editor menu and select Save Edits.
- Click the Editor menu and select Stop Editing.
Users can now input text with a longer name into the new text field.
- ArcGIS Help - Understanding field properties, aliases, and table display options
- ArcGIS Help - Modifying field properties