Mergd

Mergd is a macOS utility that solves a frustrating gap in Finder. When you drag one folder onto another in Finder and choose Replace, you lose the original files permanently. There's no undo, no recovery, nothing. Mergd takes a different approach by previewing every file operation before it runs and sending any conflicts to the Trash instead of deleting them outright. The result is folder merging you can actually trust with important data.

The tool works by analyzing both the source and destination folders, then showing you exactly what will happen before any files move. You get a complete breakdown of new files, unchanged files, and conflicts. For conflicts, you can pick from several resolution policies. Keep the newest file, keep both with a renamed copy, prefer the destination version, or decide case by case. Once you approve the plan, Mergd executes it and you can undo everything by restoring from Trash if something goes wrong.

A few technical details make it more useful than a simple file copier. It treats application bundles and photo libraries as sealed units, so it won't dig into a .app folder and corrupt it by merging internal files. It handles edge cases like case insensitive volumes, iCloud placeholder files, symbolic links, and interrupted operations. On APFS drives it uses clones for same volume copies, which means those operations are nearly instant and don't double your disk usage until you actually change the copied files.

The target audience is anyone who merges folders regularly and can't afford to lose data. If you manage photo libraries across drives, sync project folders between machines, or consolidate backup copies, the peace of mind from a preview and undo path is worth far more than the sticker price. Creative professionals and anyone with irreplaceable files will get the most value here.

What sets Mergd apart is its focus on safety over speed. Plenty of file managers can copy and move, but few let you see the full merge plan before committing. The Trash based conflict handling means you're never one click away from permanent data loss, which is exactly how Finder works by default.

Pricing is a one time $4.99 purchase on the Mac App Store. No subscription, no unlock tiers. It requires macOS 14.0 or later and runs entirely offline with no network access, so your file structure never leaves your machine. For anyone who has ever lost files to a careless Replace click, it's a small price for a much safer workflow.