MergeloomFiles and text
Side-by-side compare with word-level highlights, syntax coloring for 23 languages, editing in both panes, and one-click copying of changes across.
New in 0.4.0 Git revisions, documents and moved linesThe free diff and merge tool
The free diff and merge tool
made for your Mac.
Mergeloom compares and merges files and folders side by side. See every change, merge with confidence, and keep everything on your Mac. Fast, native and offline.
Version 0.4.0 · macOS 14 Sonoma or later · Free under the MIT license
main / Config.swiftfeature / Config.swift
1import Foundation
2
3struct Config {
4 let name: String
5 var retries = 3
6 let timeout: Double
7
8 func load() throws {
9 let url = base.appending(path: name)
10 return try decode(url)
11 }
12}
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1import Foundation
2
3struct Config {
4 let name: String
5 var retries = 5
6
7 func load() throws {
8 let url = base.appending(path: name)
9 log("loading \(name)")
10 return try decode(url)
11 }
12}
Everything in one app
One tool for every kind of difference
From a quick look at two config files to merging a whole project, Mergeloom covers the comparisons you do every day.
Folders and sync
Compare whole folder trees, filter by name, size or date, then update or mirror one side. Every sync shows a preview first.
Three-way merge
Resolve conflicts against a common base, one conflict at a time, or open any file with conflict markers. Merges folders too.
Git built in
Compare with HEAD, browse working-copy changes, or pick any two branches, tags or commits and see every file that differs.
JSON, XML and tables
Format and compare JSON and XML, list the keys that changed, and match CSV rows by a key column to see each changed cell.
Images and bytes
Swipe, side-by-side and difference views for images, and a byte-by-byte hex compare for binary files.
Documents and archives
Compare the wording of Word, RTF, OpenDocument and PDF files, and look inside ZIP archives as if they were folders.
Patches and reports
Export a standard .diff patch, an HTML report of a file or folder comparison, or print it.
Command line
Install the mergeloom tool and use it from Terminal, or set it up as your git difftool and mergetool.
Built on principles
Your files stay yours
Offline and private
No account, no cloud, no analytics. Your files never leave your Mac. The only network request is an update check, and only if you allow it.
Careful with your files
Comparing never changes anything. Saves are atomic, replaced files go to the Trash, and anything destructive asks first.
Truly native
Built with Swift, SwiftUI and AppKit. Light and dark mode, full keyboard control, and smooth scrolling through very large files.
For developers
At home in Terminal and Git
Choose Mergeloom ▸ Install Command Line Tool… and the mergeloom command is ready. The installer also gives you the lines to make it your Git diff and merge tool, with --wait so Git waits until you close the window.
- Compare files or folders from anywhere
- Three-way merge straight into an output file
- Works as git difftool and mergetool
# Compare two files or folders
# Three-way merge
# Resolve conflict markers
# Use it with Git
Version 0.4.0 · October 2026
What's new
Git revisions
Compare any two branches, tags or commits.
Staged and unstaged
See exactly what you are about to commit.
Documents
Word, RTF, OpenDocument and PDF files open as text.
Moved lines
Blocks moved from one place to another show in purple.
Switching from another tool?
Coming from Beyond Compare, WinMerge or Meld
If you already know one of these, you'll feel at home. See how Mergeloom compares, honestly, including what it doesn't do yet.
Beyond Compare
Files, folders and three-way merge without buying a license. Merge is a Pro feature in Beyond Compare; in Mergeloom it is free.
Read the comparison →WinMerge
WinMerge only runs on Windows. Mergeloom gives you the same kind of free file and folder compare on your Mac.
Read the comparison →Meld
Meld comes from Linux and runs on Mac through a community build. Mergeloom is built for macOS from the start.
Read the comparison →Questions
Frequently asked questions
Is Mergeloom really free?
Yes. Mergeloom is free under the MIT license. There is no trial, no subscription, no ads and no account to create.
Is Mergeloom an alternative to Beyond Compare, WinMerge or Meld on Mac?
Yes. Mergeloom covers the same everyday work: side-by-side file and text comparison, folder comparison and sync, and three-way merge. It is built natively for macOS with SwiftUI and AppKit, and it is free.
Does Mergeloom upload my files anywhere?
No. Everything happens on your Mac. Mergeloom has no account, no cloud and no analytics. The only network request is the check for updates, and Mergeloom checks automatically only if you allow it.
What can Mergeloom compare?
Text and source code with syntax coloring for 23 languages, whole folders, JSON, XML, CSV and TSV tables, images, binary files byte by byte, the text of Word, RTF, OpenDocument and PDF files, and ZIP archives.
Can I use Mergeloom as my Git diff and merge tool?
Yes. Choose Mergeloom ▸ Install Command Line Tool, and the installer gives you the git config lines to use mergeloom with git difftool and git mergetool. Mergeloom can also show your working-copy changes and compare any two branches, tags or commits.
Which Macs does Mergeloom run on?
Mergeloom needs macOS 14 Sonoma or later and is built for Apple Silicon Macs.
Why does macOS say it could not verify Mergeloom?
Mergeloom is not notarized by Apple yet. The first time you open it, close that message, go to System Settings ▸ Privacy & Security and click Open Anyway. You only need to do this once.
Something else? Write to info@mergeloom.in
Get Mergeloom
Free. No sign-up, no trial, no ads.
Download for MacVersion 0.4.0 · macOS 14 Sonoma or later · DMG, about 6 MB
Opening it for the first time
Mergeloom isn't notarized by Apple yet, so macOS asks before the first launch. You only need to do this once.
- Open the DMG and drag Mergeloom to Applications.
- Open Mergeloom. macOS says it could not verify the app; close that message.
- Go to System Settings ▸ Privacy & Security, scroll down and click Open Anyway.