How to find duplicate videos

The short answer

For exact copies, compare file contents with a checksum: identical bytes mean an identical file, whatever the name. For videos that look the same but were re-encoded, resized or trimmed, you need a tool that compares what's in the frames, which is called near-duplicate detection. Either way, move candidates somewhere safe before deleting anything.

Two very different kinds of duplicate

• Exact duplicates are byte-for-byte copies. They're easy to detect reliably and safe to remove once you've picked which location to keep.
• Near-duplicates are the same footage in a different file: a smaller export, a different format, a trimmed version, a clip downloaded back from a website. Their bytes differ completely, so checksum tools can't see them. They're usually where most of the wasted space is, and they need judgment, because the "duplicate" might be the edited version you wanted.

How near-duplicate detection works

Instead of comparing bytes, near-duplicate tools compare content. They sample frames from each video, reduce each frame to a compact fingerprint of what it looks like, and flag pairs whose fingerprints line up closely over time. That's why a 4K original and a 1080p export of the same clip match, even though they share no bytes and have different file sizes.

The same approach can surface similar videos, such as several takes of the same shot, which aren't duplicates at all. That's useful for culling, but it's also why a human should make the final call on what goes.

Free ways to find exact duplicates

Sorting a folder by size in Finder or File Explorer and eyeballing matching sizes is a crude first pass. Command-line tools that hash files, such as fdupes or jdupes, do it properly for anyone comfortable in a terminal. Recent versions of Apple Photos also show a Duplicates album, but it only covers items inside the Photos library, not loose video files in your folders.

Whatever you use, be careful with deletion tools that act immediately. Check which copy is referenced by a project file or a photo library before removing it.

How to do it in MediaFind

MediaFind finds duplicates across the library you've already indexed, and never deletes directly.

1. Add the folders you want to check and let MediaFind index them.
2. Open the cleanup tools. Exact duplicates are found on the free plan.
3. With Pro, include near-duplicates, similar videos, and blurry or low-quality files.
4. Review each group. MediaFind suggests which file to keep, and you can change it.
5. Send the rest to quarantine. It's reversible, so nothing is deleted until you confirm it, and you can restore anything that was moved by mistake.

Tips before you delete

Keep the highest-quality original, not the most convenient copy: the camera or phone original usually beats an export. Watch out for files that editing projects depend on, and leave the quarantine alone for a little while so you can notice anything missing.

If duplicate cleanup is the only thing you need, the free MediaClean app does local cleanup on its own. MediaFind adds search on top, so cleaning up and finding things happen in the same library.

Frequently asked questions

Why doesn't my duplicate finder see two copies of the same video?

They're probably near-duplicates, such as a re-encoded or resized export. Their bytes differ, so tools that compare checksums treat them as different files.

Is it safe to delete duplicates automatically?

It's risky. Review which copy to keep and move the rest to a reversible holding area first. MediaFind sends every candidate to quarantine before anything is deleted.

Does MediaFind find near-duplicate videos on the free plan?

Exact duplicate cleanup is free. Near-duplicates, similar videos and low-quality files are part of Pro.

Does it upload my videos to compare them?

No. Comparison runs on your computer.