The phrase "admitted to forging" is correct and usable in written English.
It can be used when someone acknowledges or confesses to the act of creating a false document or signature.
Example: "After a thorough investigation, the suspect finally admitted to forging the signature on the contract."
Alternatives: "confessed to falsifying" or "acknowledged creating a forgery."
The S.E.C. says Mr. Zhu later admitted to forging the letter and resigned shortly thereafter.
At one point, De Caro admitted to forging five copies of the "Sidereus Nuncius" and five copies of the "Compasso".
At one point, De Caro admitted to forging five copies of the "Sidereus Nuncius" and five copies of the "Compasso". (Just before he was arrested, he told me, he had burned two of the fakes in his fireplace, in a frantic attempt to cover his tracks). But Melillo, apparently satisfied with De Caro's confessions of thievery, did not press him for details.
A man in Reading, Pennsylvania, admits to forging the signatures of famous authors, pocketing more than three hundred thousand dollars on eBay.
Sue later admits to forging the letter in yet another attempt to sabotage the glee club.
Mr. Kerviel, who has admitted to fabricating trades and forging documents to hide his activity, is the only one formally under investigation.
In 1997, while a licensed stockbroker, he admitted to misleading investors and forging documents.
Butina admitted to working with an American political operative to forge connections with the National Rifle Association and conservative leaders and candidates.
A chemist at the center of a scandal at a Massachusetts drug laboratory admitted to investigators that she faked test results for two to three years, forged signatures and bypassed proper procedures, a State Police report says.
Butina, 30, admitted to working at the direction of Alexander Torshin, a Russian former government official, and with an American political operative to forge connections with NRA officials, conservative leaders and 2016 presidential candidates, including Donald Trump.
A La Canada Flintridge couple who ran televised art and jewelry auctions have admitted to running a scam that bilked buyers out of more than $20 million by selling bogus artworks and forging the signatures of such notables as Picasso, Chagall and Dali.
