In the 1960s, Otto Frank recalled his feelings when reading the diary for the first time, "For me, it was a revelation. There, was revealed a completely different Anne to the child that I had lost. I had no idea of the depths of her thoughts and feelings." Michael Berenbaum, former director of the United States Holocaust Memorial Museum, wrote, "Precocious in style and insight, it traces her emotional growth amid adversity. In it, she wrote, 'In spite of everything, I still believe that people are really good at heart.'"
In 2009, the notebooks of the diary were submitted by the Netherlands and included in UNESCO's Memory of the World Register.
It was reported around the world that in February 2014, 265 copies of the Frank diary and other material related to the Holocaust were found to be vandalized in 31 public libraries in Tokyo, Japan. The Simon Wiesenthal Center expressed "its shock and deep concern" and, in response, Chief Cabinet Secretary Yoshihide Suga called the vandalism "shameful." Israel donated 300 copies of Anne Frank's diary to replace the vandalized copies. An anonymous donor under the name of 'Chiune Sugihara' donated two boxes of books pertaining to the Holocaust to the Tokyo central library. After media attention had subsided, police arrested an unemployed man in March. In June, prosecutors decided not to indict the suspect after he was found to be mentally incompetent. Tokyo librarians have reported that Nazi-related books such as the diary and Man's Search for Meaning attract people with mental disorder and are subject to occasional vandalism.
In 2009, the armed group Hezbollah called to ban the book in Lebanese schools, arguing that the text was an apology to Jews, Zionism and Israel.
In 2010, the Culpeper County, Virginia school system banned the 50th Anniversary "Definitive Edition" of Anne Frank: The Diary of a Young Girl, due to "complaints about its sexual content and homosexual themes." This version "includes passages previously excluded from the widely read original edition.... Some of the extra passages detail her emerging sexual desires; others include unflattering descriptions of her mother and other people living together." After consideration, it was decided a copy of the newer version would remain in the library and classes would revert to using the older version.
In 2013, a similar controversy arose in a 7th grade setting in Northville, Michigan, focusing on explicit passages about sexuality. The mother behind the formal complaint referred to portions of the book as "pretty pornographic."
The American Library Association stated that there have been six challenges to the book in the United States since it started keeping records on bans and challenges in 1990, and that "[m]ost of the concerns were about sexually explicit material".