Finderlock

What is Finderlock?

FinderLock is a native macOS app that lets you lock any file or folder in Finder with Touch ID or a password. AES-256 encryption — the same standard used by banks. Unlike FileVault (full-disk only), FinderLock protects individual files with one click. Double-click to unlock, auto-lock when idle, and lock icon badges right in Finder. Everything stays on your Mac. No accounts, no cloud, no telemetry. Free plan included. One-time purchase — no subscription.

From the website

Finderlock — Lock Mac files with Touch ID — right in Finder

Military-grade file encryption for macOS. Protect sensitive files with AES-256 and Touch ID biometric security. One-time purchase from $49. Forever free with 3 items. No subscription.