Verified file copy for Mac
VerifiedCopy copies your files and checks every copy matches the original — byte for byte. Know your backups, archives, and transfers arrived perfectly intact, with no silent corruption.
How VerifiedCopy works
- Copy Files are written to one or more destinations.
- Re-read Every copied file is read back from the destination drive.
- Compare Checksums confirm each copy matches the original byte for byte.
If a file doesn't match, VerifiedCopy flags it and can re-copy from the source automatically — no silent corruption, no surprises.
From the makerI kept copying video files from my MacBook to an external drive formatted in exFAT, ejecting safely, then plugging the drive into my TV — only to find the videos corrupted. Not every time, not predictably. Enough to stop trusting the copy.
macOS said the copy succeeded. Safe eject said the drive was safe to unplug. Neither of them actually reads the file back to confirm the bytes survived the trip. VerifiedCopy is the tool I wanted to exist — it copies, then re-reads every byte and tells you honestly whether the copy arrived intact.
Built for photographers, videographers, and archivists
Anyone who can't afford to lose data relies on verified copies. Offload camera cards knowing every photo arrived intact. Archive Final Cut Pro libraries with confidence. Create verified backups across multiple drives in a single pass.
Copying to exFAT drives for Windows?
Silent file corruption on exFAT is a longstanding macOS issue — Finder will happily report a copy as successful even when bytes have been mangled in transit, especially with large files or drives shared between Mac and Windows machines. VerifiedCopy reads every copy back from the exFAT drive and compares it byte-for-byte against the original, so you catch corruption before you hand the drive off — not after a colleague opens it on Windows.
Why VerifiedCopy?
Copy & Verify
Copy files to one or more destinations, then automatically check every copy matches the original — byte for byte. No silent corruption, ever.
Verify & Repair
Compare existing copies against the originals and rewrite only the damaged blocks — not the whole file. Repairing a large archive stays fast, even when only a few sectors have gone bad.
Integrity Check
Scan files for corruption without copying them. A visual block map shows each chunk individually — so you can see exactly which parts of a file are healthy, damaged, or repaired at a glance.
Multiple Destinations
Copy to several drives at once. Perfect for creating verified backups to multiple locations in a single operation.
Fully Offline
No network access, no tracking, no accounts, no cloud. Your files never leave your Mac.
Fast & Native
Built natively for macOS with Swift. Lightweight, efficient, and runs securely inside Apple's app sandbox.
Frequently asked questions
How does VerifiedCopy verify a copy?
Every file copied is read back from the destination drive and compared byte-for-byte against the source. If there's any mismatch, the copy is flagged and can be retried automatically.
What's the difference between VerifiedCopy and Finder copy?
Finder copies files but doesn't verify them afterwards. A damaged sector, flaky cable, or failing drive can silently corrupt a file during the copy and you'd never know. VerifiedCopy re-reads every copy and confirms it matches the original.
Does VerifiedCopy work with external drives, SD cards, and network volumes?
Yes. VerifiedCopy works with any drive macOS can mount, including external SSDs, HDDs, USB sticks, SD cards, and network shares.
Can VerifiedCopy help with exFAT corruption on Mac?
Yes — this is one of the most common reasons people install VerifiedCopy. Silent file corruption on exFAT drives is a longstanding macOS issue, especially with large files or drives shared between Mac and Windows. VerifiedCopy reads every copy back from the exFAT destination and compares it byte-for-byte against the source, so you know the file is intact before you hand the drive to a Windows machine.
What is silent data corruption or bit rot?
Silent data corruption (sometimes called bit rot) is when a file's contents change without any error message — caused by aging storage, faulty cables, or stray cosmic rays flipping bits. You often only notice when you try to open the file years later.
Is VerifiedCopy safe? Does it send data anywhere?
No. VerifiedCopy runs fully offline inside Apple's macOS sandbox. It makes no network requests, uses no analytics, and only accesses files you explicitly select.
Can VerifiedCopy repair corrupted files?
Yes. Verify & Repair scans existing copies against the originals and rewrites only the damaged blocks — not the entire file. That keeps repair fast, even for large archives where just a few sectors have gone bad.
What file types and sizes does VerifiedCopy support?
Any file, any size. VerifiedCopy verifies raw bytes rather than looking at file formats, so it works equally well for photos, videos, databases, archives, or any other type of file.
How is VerifiedCopy different from rsync or cp?
cp doesn't verify copies at all. rsync can verify with the -c flag, but you're in Terminal managing flags manually. VerifiedCopy is a native Mac app with checksum verification on by default, a visual progress view, multiple destinations in one pass, and a repair mode.