How to Remove the "None" Reason from an Acrobat Digital Signature
Question details
The user wants to know if it is possible to remove the default "None" option from the signature reason dropdown in Adobe Acrobat.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Digitally signing a PDF document where custom signing reasons are configured, but users are still able to select "None" instead of a valid reason.
- Observed behavior
- Acrobat continues to display "None" as a default reason in the free-form signature reason menu, bypassing custom reason enforcement.
Ensure you have administrative access to your Adobe Acrobat forms and familiarity with PDF JavaScript if you plan to implement custom validation scripts.
Use Custom JavaScript to Enforce a Signature Reason
Since Acrobat does not natively allow removing the "None" option, you can use JavaScript to validate the signature field and prevent signing if "None" is selected.
Adobe Acrobat does not provide a built-in setting to delete or hide the default "None" reason. The most effective workaround is to apply a script that blocks the signature action unless a valid reason is provided.
Open your PDF form in Adobe Acrobat, go to the Tools menu, and select Prepare Form.
Right-click on the digital signature field you want to restrict and select Properties from the context menu.
Navigate to the Validate tab, select 'Run custom validation script', and click Edit. Enter JavaScript code that checks if the selected reason is 'None' and throws an alert or prevents the signature from being finalized.
Implement a Controlled Form Workflow
Use a structured workflow where the signature reason is captured in a separate mandatory dropdown field before the signature is applied.
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Frequently Asked Questions
Why does Acrobat include 'None' as a default signature reason?
Adobe Acrobat includes 'None' by default to accommodate users who need to sign documents without specifying a particular legal or administrative reason, ensuring flexibility across different signing scenarios.
Can I edit the default list of signature reasons in Acrobat?
Yes, you can add custom reasons via Acrobat's Preferences under Signatures > Creation & Appearance > More. However, the built-in 'None' option cannot be natively deleted from this menu.
Will custom JavaScript validation work in all PDF viewers?
No, JavaScript validation is highly dependent on the PDF viewer. While it works reliably in Adobe Acrobat and Adobe Reader, third-party PDF readers or browser-based viewers might ignore the script.
