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
أَسْتَغْفِرُ اللَّهَ الَّذِي لَا إِلَٰهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ وَأَتُوبُ إِلَيْهِ
I seek the forgiveness of Allah, there is no deity except Him, the Ever-Living, the Sustainer, and I repent to Him.
Sahihاللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَاهْدِنِي وَعَافِنِي وَارْزُقْنِي
O Allah, forgive me, have mercy on me, guide me, grant me well-being, and provide for me.
Sahihرَبَّنَا ظَلَمْنَا أَنفُسَنَا وَإِن لَّمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ
Our Lord, we have wronged ourselves, and if You do not forgive us and have mercy upon us, we will surely be among the losers.
Sahihرَبَّنَا آمَنَّا فَاغْفِرْ لَنَا وَارْحَمْنَا وَأَنتَ خَيْرُ الرَّاحِمِينَ
Our Lord, we have believed, so forgive us and have mercy on us, and You are the best of the merciful.
Sahih