How can I customize validation and error messages in the Poper Form?
You can make your form easier to complete by customizing the messages users see when they miss a required field or enter invalid input (like email, URL, phone, or checkbox limits).
Why this feature is important
Clear validation messages help users fix issues quickly, which means:
fewer abandoned submissions
less confusion on required fields
higher completion rate
Step-by-step
Open your form in the editor.
Go to Settings.
Open Language / Custom Messages.
Edit the validation messages you want to customize (for example):
Required field message
Invalid email message
Invalid URL message
Checkbox min/max selection message
Terms acceptance message
Save your changes.
Open preview/share link and test each validation case.
Confirm users now see your custom message text.
Message-writing best practices
Keep messages short and specific.
Tell users exactly what to fix.
Use a friendly tone (not technical).
Match your brand voice consistently.
Examples:
“Please enter your work email address.”
“Please select at least one service option.”
“Please accept the terms to continue.”
What to test before publishing
Required text fields
Email and URL format validation
Phone/number restrictions
Checkbox/radio selection rules
Terms acceptance flow
Troubleshooting
If old text still appears, save again and refresh preview.
If one field shows default text, check that field-specific/custom message is configured.
If users still struggle, simplify wording and remove unnecessary rules.