Is it illegal to forge someone else's signature?
According to the relevant laws, it is illegal and criminal to fraudulently use someone else's signature, and serious cases will constitute a crime.
Public security administration punishment law
Article 49 Whoever steals, swindles, robs, robs, extorts or intentionally damages public or private property shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan; If the circumstances are serious, he shall be detained for more than 10 and less than 15, and may also be fined less than 1000 yuan.
Criminal law of the people's Republic of China
Article 266 Whoever defrauds public or private property in a relatively large amount shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also, or shall only, be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.
The above knowledge is my opinion on "Is it illegal to use someone else's signature?" According to the relevant laws, it is illegal and criminal to fraudulently use someone else's signature, and serious cases will constitute a crime.