Peace be on you.....Holy Quran in its present form was being recited by Holy Prophet (pbuh) and Companions and was commited in memory by thousands...
Based on it, a volume was made by First Khalifah Hazrat Abu Bakr (r.a.)......The 3rd Khalifah Hazrat Uthman (r.a.) made a standerdized copy with certified enunciation....
DETAILS
""THE COMPILATION OF THE QURAN
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Thus we find that in the time of the Holy Prophet himself the Quran used to be recorded in writing, was committed to memory and was constantly recited and thousands of people knew the whole of it by heart, though it had not yet been collected in one volume.
THE QURAN COLLECTED IN ONE VOLUME
When it was found that five hundred of the reciters of the Quran had been killed in the battle with Musailima's army, 'Umar suggested to Abu Bakr (who was then the Khalifa) that if those who had the Quran by heart began to be lost in battles in such large numbers, the safe-guarding of the purity of its text would become difficult and that the time had therefore arrived when the whole of the Quran should be collected in one volume. Abu Bakr at first demurred but eventually accepted the suggestion and appointed Zaid bin Thabit, being one of those who used to record the Quran at the dictation of the Holy Prophet,
to collect the text of the Quran in one volume and appointed prominent Companions of the Holy Prophet to assist him in the task. Abu Bakr directed that the text of the Quran should be collected from its recorded fragments and that the accuracy of the text should be certified by two persons who knew the whole of the Quran by heart. This task was soon accomplished and a written text of the whole of the Quran was got together in one volume, which was certified as accurate by those who knew it by heart. On the basis of these facts can there be the slightest ground for suggesting that variations in the text of the Quran had crept in between the death of the Holy Prophet and the compilation of the Quran into one volume under the directions of Abu Bakr and the supervision of Zaid bin Thabit ? Can it be reasonably suggested that any difficulty could arise in the compilation into one volume of a Book which was being continuously recited every day by large numbers of persons, the whole text of which used to be recited from beginning to end in the course of the month of Ramadan by persons who had committed it to memory to the Muslims assembled in congregational prayers, the congregation itself containing large numbers of people who knew the whole of it by heart, and which had been reduced to writing at the dictation of the Holy Prophet himself as the revelation was received from time to time ; more specially when the task of compilation was committed to the care of a person who was himself one of the recorders of the Quran and had committed the whole of it to memory ? Had the compiled volume contained a single variation from the text as dictated by the Holy Prophet and as committed to memory under his supervision by a large number of people, it would at once have been detected and set right.
The authenticity and accuracy of the text of the Quran are thus established on the surest and most irrefutable evidence. The accuracy of the text of no other writing in the world is so far above the possibility of doubt as that of the Quran.
STANDARDIZED COPIES OF THE QURAN
During the time of 'Uthman complaints began to be received that different tribes enunciated certain words of the Quran in their own peculiar manner and that as a result of this nonMuslims who heard these words differently enunciated fell into the misconception that there were variations in the text of the Quran. It has already been explained that these variations were the result of tribal or family practice and had nothing whatsoever to do with any variation in the text nor did they affect the meaning of any word. Nevertheless, 'Uthman thought it wise to forbid all variations even of enunciation of vowel points. He had copies prepared of the text which had been collected in the time of Abu Bakr and despatched these copies into different parts of the Muslim dominions and issued a direction that no variation in the recitation of the Quran from the standard text, even if it was only in the matter of enunciation of vowel points, should be permitted..........................."
More @
https://www.alislam.org/library/books/Introduction-Study-Holy-Quran.pdf
[from pages 362++}
