اللَّهُمَّ إِنَّكَ عَفُوٌّ كَرِيمٌ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
Allahumma innaka 'Afuwwun Karimun tuhibbul-'afwa fa'fu 'anni
O Allah, You are the Pardoner, the Most Generous, and You love to pardon, so pardon me.
This expanded version adds "Karim" (the Most Generous) to the du'a Aisha (RA) was taught for Laylatul Qadr. Al-'Afuww means the One who erases sins completely — not just forgives them, but wipes them out as though they never existed.
Related Du'as
رَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ
My Lord, forgive me and accept my repentance. Indeed, You are the Acceptor of Repentance, the Most Merciful.
Sahihاللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا وَلَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ فَاغْفِرْ لِي مَغْفِرَةً مِّنْ عِندِكَ وَارْحَمْنِي إِنَّكَ أَنتَ الْغَفُورُ الرَّحِيمُ
O Allah, I have wronged myself greatly, and none forgives sins except You. So grant me forgiveness from Yourself and have mercy on me. Indeed, You are the Forgiving, the Most Merciful.
Sahihأَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ
I seek Allah's forgiveness and I repent to Him. (The Prophet ﷺ used to say this more than 100 times a day.)
Sahihرَبِّ اغْفِرْ وَارْحَمْ وَأَنْتَ خَيْرُ الرَّاحِمِينَ
My Lord, forgive and have mercy, and You are the best of those who show mercy.
Sahih