Back up the card before you format it.
Offload copies a card to up to three drives at once, then reads every copy back to prove it matches. When it says verified, it is.
Or get all five apps in the Suite for $129.
Dragging a card to a drive in Finder doesn't check the copy. A loose cable or a tired drive can write a damaged file that looks fine until you open it. Offload reads every copy back and compares it with the card.
How it works
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Download Offload
Free to download, and the first 10 offloads are free. Open the file and drag Offload into Applications. Needs macOS 14 or later.
Download Offload -
Pick the card and your drives
Connected drives are listed for you. Choose up to three, and a folder pattern like date, camera and card name.
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Offload reads once, writes everywhere
Each file is read from the card a single time and written to every drive in parallel, so three copies take about as long as one.
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Every copy is checked
Offload reads each copy back from the drive and compares its checksum with the card's. A file only gets its real name once it matches.
What's in it
Up to three drives at once
One read from the card, written to every drive in parallel.
Read-back verification
Copies are read from the drive itself, not the Mac's memory, and compared with the card.
Card image for Recover
Optionally keep a full image of the card. If a deleted file turns up missing later, Recover can find it.
ASC MHL and a report
The industry checksum format, plus a readable report you can send a client.
Picks up where it stopped
Unplugged or stopped? Run it again: finished files are checked, not copied again.
Checksums
XXH64 · MD5 · SHA-256
How it compares
The tools pros already use are good. They're also priced for film crews. Here's how Offload lines up, taken from each company's own product page.
| Shutterkit Offload | OffShoot | ShotPut Pro | Tusk | |
|---|---|---|---|---|
| Price | $59 one-time | $169, Pro $249 | $169 | $79 |
| Try before buying | 10 free offloads | Not listed | Not listed | 14-day trial |
| Copies to several drives at once | Up to 3 | Yes | Yes | Yes |
| Reads every copy back and checks it | Yes | Yes | Yes | Yes |
| ASC MHL checksum files | Yes | Pro only | Yes | Not listed |
| Readable report | Yes | Pro only | PDF, HTML, CSV | PDF, CSV |
| Card image for later recovery | Yes, opens in Recover | Not listed | Not listed | Not listed |
| Cloud destinations | No | Pro (S3) | Not listed | Drive, Dropbox, S3 |
| Windows | No, Mac only | Yes | Separate version | No |
| Computers per license | 3 Macs | 1 per activation | 1 at a time | Not listed |
| Updates included | Free within the major version | 1 year | 1 year, then $59/yr | 1 year |
From each company's website in October 2026. "Not listed" means we couldn't find it on their product page, not that it's impossible. Spot something out of date? Tell us and we'll fix it.
Questions
Why read the copies back? The copy finished without an error.
A copy can finish "successfully" and still be wrong: a flaky cable, a failing drive or a full disk can all leave damaged files without an error. Reading each copy back from the drive and comparing checksums is the only way to know. Offload reads past the Mac's memory cache, so it checks what's actually on the drive.
What's a card image, and why would I want one?
A sector-by-sector copy of the whole card, including space marked as deleted. If you later realize a shot was deleted in camera before the offload, Shutterkit Recover can search the image for it, even after the card itself has been formatted and reused. It takes as much space as the card, so it's optional.
What's ASC MHL?
A standard checksum file from the American Society of Cinematographers. It travels with the footage, so anyone down the line can check the files are still intact with any tool that reads MHL. Offload's files pass the ASC's own reference tool.
What happens if a drive fills up or gets unplugged?
That drive stops and the others carry on. Nothing half-written is left behind under a real file name. Run the offload again once the drive is back and Offload picks up where it stopped.
Does it work with my camera and cards?
Any card that shows up on your Mac: SD, microSD, CFexpress, CFast and CompactFlash through a reader, from any camera, drone or recorder. The card's folders are copied exactly as they are, and Offload never writes to the card.
Is XXH64 safe enough, or should I use SHA-256?
XXH64 catches accidental damage, which is what you're guarding against, and it's fast enough not to slow a card reader down. It's what most offload tools use. Pick MD5 or SHA-256 if your post house or client asks for it.
Your first 10 offloads are free.
After that it's $59, once. One license covers three Macs.
macOS 14 Sonoma or later. Apple silicon and Intel.