Selling or giving away your Android™ device? It takes just three simple steps to securely wipe that data using patented security standards, making it impossible to recover any deleted files. You might think you've deleted those photos, documents, and videos on your mobile device? But anyone can restore those manually deleted files from the free space until the data itself has been overwritten using certified secure deletion algorithms. With military-grade security, iShredder™ data shredder (eraser) app which securely deletes data leaving them irrecoverable and protects falling into malicious hands. ★★★★★ Made by Protectstar™ the world leader in secure deletion of mobile devices ★★★★★ Securely clean temporary data and wipe the cache of your device ★★★★★ Secure data deletion fully compliant with the European privacy legislation (GDPR) ★★★★★ Wipe and securely erase the freespace ★★★★★ Securely delete all data, files, folders, photos, contacts, and more incl. ★★★★★ Certified erasure methods go beyond international security standards

The Android data eraser which shreds your data permanently

Description of Secure Erase iShredder (from google play)

Ishredder review