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How to Lock Entered Information in a Fillable PDF Form
Question details
The user needs to prevent recipients from modifying the data they have entered into a fillable PDF form before sending the document.
- Product
- Device & OS
- not provided
- Scenario
- Completing a fillable PDF form and preparing to share it with others while ensuring the entered data remains secure and uneditable.
- Observed behavior
- By default, completed fillable PDF forms retain their editable fields, allowing anyone who opens the document to alter the entered information.
Before applying any locks or flattening your document, make sure to save a backup copy of the original filled PDF in case you need to update the information later.
Permanently Flatten the PDF Document
Flattening the PDF merges all form fields into the document's background, making it impossible for recipients to click or edit the fields.
This is the most secure method to ensure your entered data remains permanently locked across all devices and PDF readers. The visual appearance of the form is preserved, but all interactive elements are removed.
Open your filled PDF form in your preferred PDF viewer or editor.
Navigate to the 'File' menu in the top-left corner and select 'Print'.
In the printer selection dropdown, choose 'Microsoft Print to PDF', 'Adobe PDF', or 'WPS PDF'.
Click 'Print'. A dialog box will appear asking you to specify a location and a new file name. Save the file and open it to verify the fields are locked.
Set Form Fields to Read-Only
Change the properties of the form fields to read-only to prevent casual editing while maintaining the document's underlying form structure.
Lock Fillable PDF Forms Easily with WPS Office
WPS Office offers a comprehensive PDF toolkit that makes it incredibly easy to fill out forms, lock sensitive fields to read-only, or flatten documents to permanently secure your data.
- 1. Open the PDF: Launch WPS PDF and open your fillable PDF document.
- 2. Fill out the form: Click on the interactive fields and enter your required information.
- 3. Flatten the document: Go to the 'Menu' > 'Print', select 'WPS PDF' as your printer, and click 'Print' to save a permanently locked, flattened copy of your form.
Frequently Asked Questions
Can I unlock a flattened PDF form later?
Once a PDF form is flattened, the interactive fields are permanently merged into the page background and cannot be easily reverted to a fillable state. This is why it is highly recommended to save a separate backup of the original fillable file before flattening.
Does setting a PDF to read-only require a password?
Setting individual form fields to read-only via properties does not inherently require a password. However, because anyone with a PDF editor could change the properties back, you should apply a 'Restrict Editing' permission password for true security.
Why did my form's visual appearance change after flattening?
Flattening usually preserves the visual appearance perfectly. However, if your form contained interactive elements like dropdown arrows or hover-states that were visible while editing, they might disappear or render as plain text when flattened.
Can I lock specific fields while leaving others editable?
Yes. By using the 'Read-Only' method in a PDF editor, you can select specific completed fields, right-click to access their properties, and set only those to read-only. This leaves the remaining fields open for other recipients to fill.
