Muhammad al-Darr produced an English translation many decades ago. You cannot legally download a free PDF of this without violating copyright. However, you can find used hardcopies on Amazon or Abebooks. Occasionally, libraries archive scanned versions for internal use, but these are not for public download.
Do not confuse Qut al-Qulub with:
Qut al-Qulub is not a light summary but a detailed, systematic guide. Its main themes include:
As of the current publishing date, there is no widely authorized, complete, free PDF of Qut al Qulub in modern English available for mass distribution.
However, there are several legal and academic alternatives that you can use to access the content of this book:
Qut al-Qulub acts as a bridge between early asceticism (Zuhd) and systematic Sufism. It is not just a theoretical text but a practical manual for spiritual development.
As of the current publishing landscape, there is no complete, widely circulated single-volume English translation of Qut al-Qulub available as a public domain PDF.
Unlike Ihya Ulum al-Din or Risalat al-Qushayriyyah, which have full English translations, Qut al-Qulub remains largely untranslated in its entirety.