Deadbolt is a free, open-source Mac app that wraps strong symmetric encryption into a minimal drag-and-drop interface, letting you lock and unlock individual files without touching the command line.
What is Deadbolt?
Deadbolt is a lightweight file-encryption utility for macOS that makes AES-256 encryption accessible to anyone — no Terminal, no GPG key management, no configuration files. You drag a file onto its window, type a passphrase, and you get an encrypted .deadbolt file back in seconds. Decryption is the same motion in reverse. The project is maintained on GitHub, free to download, and carries no telemetry.
What makes it stand out from most encryption tools is exactly what it leaves out: there are no accounts, no cloud sync, no key escrow, and no settings panel to misconfigure. The entire surface area of the app is a single window.
What does Deadbolt do best?
Deadbolt excels at one-off, person-to-person file encryption where you already share a passphrase with the recipient out-of-band. Think: sending a tax return to your accountant over email, archiving sensitive documents to an external drive, or encrypting a credentials file before committing it to a repo.
- Drag-and-drop encryption: drop any file — PDF, ZIP, image, anything — and it encrypts in place, producing a self-contained .deadbolt artifact.
- Passphrase-based: no PKI, no key pairs, no certificate authorities. Just a shared secret you choose.
- Genuine open source: the encryption logic is auditable on GitHub — you are not trusting a black box.
- Near-zero footprint: the app is tiny, installs via Homebrew Cask, and adds nothing to your login items or launch agents.
I've been using it to encrypt client-facing documents before sending them through messaging apps where I can't control the receiving end. The workflow is genuinely faster than setting up a GPG-encrypted archive every time.
Is Deadbolt free?
Yes — Deadbolt is completely free and open source. There is no paid tier, no Pro upgrade, and no donation nag screen. You can install it with brew install --cask deadbolt or download directly from the GitHub releases page. Because it is open source, you can also inspect every line of code before trusting it with sensitive data — which, honestly, you should do with any encryption tool.
Who should use Deadbolt?
Deadbolt is the right tool for Mac users who need occasional, practical file encryption and have no appetite for GPG's learning curve or VeraCrypt's container-based workflow. It is particularly well-suited to:
- Freelancers and consultants sending sensitive deliverables over email or Slack
- Developers who need to encrypt secrets files before storing them in version control
- Anyone archiving personal documents (passports, financial records) to external drives or cloud storage they don't fully control
- Non-technical users who need to receive an encrypted file from a tech-savvy sender — the decryption side is just as simple as encryption
If you need to encrypt whole disk volumes, manage a public-key infrastructure, or handle dozens of recipients with individual keys, look elsewhere. Deadbolt is emphatically not a PKI tool.
What are the best Deadbolt alternatives?
Deadbolt's closest spiritual alternative is Cryptomator, which also targets non-technical Mac users but takes a vault approach — it encrypts an entire folder transparently rather than individual files. Cryptomator is better for ongoing cloud-storage encryption; Deadbolt is better for one-shot file handoffs.
VeraCrypt is the gold standard for power users who want encrypted containers or full-disk encryption, but the setup overhead is significant compared to Deadbolt's two-click flow. GPG Tools (the GPG Suite Mac port) gives you public-key encryption and signed files, which is the right choice when you need non-repudiation or are working in a team with established key infrastructure — but the learning curve is real, and key management is ongoing work.
For most people who just want to lock a file and hand it to someone, Deadbolt removes more friction than any of those alternatives.
How does Deadbolt compare to Cryptomator?
Deadbolt and Cryptomator solve adjacent but different problems. Cryptomator creates an encrypted vault directory that mounts as a virtual drive — ideal for keeping a synced Dropbox or iCloud folder private at rest. Deadbolt encrypts individual files on demand with no persistent vault to manage. If you are protecting a single PDF before emailing it, Deadbolt is the faster path. If you want everything in your Documents folder encrypted transparently in the background, Cryptomator wins. I keep both installed; they do not overlap in daily use.
