How do you say "I hereby declare" in English?

This is to certify the English translation.

This is to certify that. This is to certify that.

Bilingual example

1. I hereby certify that the above information is accurate and true. ?

I hereby certify that the above information is true.

I hereby certify that the statements and answers given here are complete and correct. ?

I hereby declare that the above information is complete and true.

3. I hereby certify the information provided voluntarily. ?

I hereby certify that the above information is provided by myself voluntarily.

I hereby certify that all the information I provided is complete and accurate. ?

I have filled in all the information and guarantee its authenticity and accuracy.

I, the above applicant, hereby certify that all the above information is true and correct. ?

I, the above applicant, guarantee that all the above information is true and correct.