The phrase "signed and seal" is commonly used to indicate that a document is official, legal, and binding. However, there are several synonyms that can be used instead of "signed and seal" to convey the same meaning. One option is "executed and stamped," which can make a document seem even more official. "Verified and authenticated" is another strong choice, as it suggests that the document has been thoroughly vetted. Other synonyms include "endorsed and certified," "validated and authorized," and "witnessed and affirmed." Ultimately, the goal of any synonym for "signed and seal" is to convey the idea that a document is legitimate and legally binding.