Is it true that there is no evidence of a Qur’aan being written
      in the 7th century?
Question

                I was womndering if it is true that there is no evidence that there is
      no trace of a Qu'ran being written in the 7 th century
Praise be to Allah.This is a false and incorrectstatement made by those who try to find faults with
      Islam so as to put people off this religion. It is sufficient to know that
      Allaah has guaranteed to preserve the Qur’aan, as He says
      (interpretation of the meaning):
“Verily,
      We, it is We Who have sent down the Dhikr (i.e. the Qur’aan) and surely,
      We will guard it (from corruption).” [al-Hijr 15:9]
 Moreover, the fact that the transmission
      of the Qur’aan by memory and in writing was mutawaatir – narrated by
      groups to groups [to such anextent
      that so many people could not conceivably have agreed upon a lie] – is
      well known to anyone who has the slightest acquaintance with Islamic
      knowledge, especially knowledge of recitations and reciters. 
 There are still many people nowadays who
      have learned the Qur’aan orally, with isnaads directly going back to the
      Prophet 
 (peace and blessings of Allaah be upon him).
 One of the miracles of Allaah’s
      protection of the Qur’aan is the fact that those who try to tamper with
      it are always found out.
 The point is, everything that was
      revealed to the Prophet 
 (peace and blessings of Allaah be upon him)
      was written down in front of him straight away, and some of the Sahaabah
      had masaahif (written copies
      of the Qur’aan). After the death of the Prophet 
 (peace and
      blessings of Allaah be upon him), thefirst khaleefah, Abu Bakr al-Siddeeq (may Allaah be pleased with
      him) gathered the Qur’aan inwritten
      and kept it. Then the third khaleefah, ‘Uthmaan ibn ‘Affaan (may
      Allaah be pleased with him) compiled it in mus-hafs that were based on the
      mus-haf compiled by Abu Bakr, in addition to what had been memorized.
When
      we realize that the Qur’aan was written down and compiled by the
      Sahaabah, and ‘Uthmaan sent copies of the Mus-haf during his reign to
      all the main centres of Islam, so that it would be a reference for them,
      and there were no disputes concerning them, then how can we say that there
      is no written trace of the Qur’aan in the seventh century? Moreover,
      there are several ancient manuscripts of the Qur’aan in libraries and
      museums which bear visible testimony to the fact that nothing has been
      changed in the Book of Allaah. Allaah says (interpretation of the
      meaning):
“And
      verily, it is an honourable well‑fortified respected Book (because
      it is Allaah’s Speech, and He has protected it from corruption).
      Falsehood cannot come to it from before it or behind it, (it is) sent down
      by the All‑Wise, Worthy of all
      praise (Allaah).” [Fussilat 41:41-42]
      
      
      
      And Allaah knows best.