How to find duplicate files on Android

Last reviewed: September 23, 2026 · Markdown version

Files by Google will find them for you: tap Menu, then Clean, then Select files on the “Duplicate files” card, and at the bottom tap “Move x file(s) to Trash”. It marks one file with an “Original” badge and recommends you keep it, and whatever you remove goes to Trash, where files remain for 30 days before being automatically deleted.

The steps, as Google writes them

Google's duplicate-files page (Delete duplicate files, read 23 September 2026) opens with a warning, then lists the taps:

"The original file is marked with an “Original” badge. We recommend that you keep the original file."
Tap Menu, then Clean.
"On the “Duplicate files” card, tap Select files."
"Select the files you want to delete."
"At the bottom, tap Move x file(s) to Trash."
"On the confirmation dialog, tap Move x file(s) to Trash."

The badge line is the important one, and it is a recommendation rather than a guard rail — the selection is yours to get wrong. Because the removal goes via Trash, a mistake has 30 days in which to be noticed — Google says removed files sit there for that long before automatic deletion (Move files to Trash & restore files from Trash, read 23 September 2026). That page also warns that files deleted from the "Junk files" card skip Trash entirely — a different card from this one.

What “duplicate” should mean

A tool can decide two files are the same in several ways, and they are not equally trustworthy. Matching names prove nothing; two unrelated files can both be called IMG_0042.jpg. Matching sizes prove very little either. Comparing the actual contents — every byte, usually via a hash — is the only test worth insisting on before you let anything delete. Google's page does not say which of these tests Files by Google uses.

There is a second rule that no tool should need to be told: one copy of every file must always survive. A duplicate cleaner that can leave you with none of something is not a cleaner, it is a shredder with a filter.

Where Adinand Auto File Sorter fits

Its duplicate finder is free, and it needs Android 11 or newer — on Android 10 the app says so rather than running a partial scan. It compares files by a SHA-256 hash of their contents, so size alone never decides, and two files are duplicates only when every byte matches; it does not look for pictures that merely resemble one another, and it makes no claim to.

One copy of every file is always kept, and the copies you tick go to a trash folder inside the sorted-files folder that you can restore from for 7 days. It is not the same window Files by Google keeps, which is exactly why the app states its own.

What the app does comes from its own code audit.