I've created a form with a column of numbers. All fields in column are set to number with 2 digits decimal place (00.00). It works fine on hard drive, but once uploaded to website, it looses number formatting and text can be entered.
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As you have created the PDF form, please confirm if it was created using the Acrobat application or with some other source.
Would it be possible to share that PDF with us so we can have a look?
How exactly you are uploading it to the website? Are you uploading the document on your website? Please share more details.
Let us know if you have any questions.
What web browser does you use? Can be an issue of the PDF viewer in the web browser.