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What is Meld?
Meld is a visual diff and merge tool: it shows two or three versions of a file or folder side by side so you can see exactly what changed and combine the changes you want. It works on local files, whole directories, and files tracked by version control.
Its three main jobs:
- File comparison — compare, edit and merge files with live updates as you type, jump between change blocks, and ignore differences that don't matter (such as whitespace) with simple text filters. Three-way merge mode shows a base version and helps you resolve conflicts.
- Folder comparison — spot missing, new or modified files across two folders, then drill into any file pair for the detailed view. You can exclude files or folders to keep the comparison focused.
- Version control — check changes, commit and push from inside Meld, and see version-control states. Git, Mercurial, Bazaar and Subversion are supported, and it integrates as a merge tool (for example with
git mergetool).
Who it suits: developers reviewing a patch or untangling a merge conflict, anyone syncing two directory trees, and writers or admins comparing document versions. If you mainly want to see what changed in a commit, a terminal git diff is faster; Meld earns its place when you need to edit or merge rather than just read, or when you're comparing whole folders.
Practical notes: it's packaged for most Linux/Unix distributions and on Flathub, with a Windows installer; macOS is not officially supported, though Homebrew, MacPorts and Fink builds exist. It doesn't do automatic updates or portable installs.
Next step: install it, then run a three-way merge on a branch you've been avoiding — or, if you just want a quick look, point it at two folders to see which files differ. For a lighter, terminal-first alternative, see Git's built-in diff and mergetool commands.
How do I install Meld on Windows?
Download the installer from the official Meld site and run it. Meld's own installation notes say Windows users should download the installer, and that Meld does not yet support automatic updates or portable installs — so expect to re-download and re-run the installer when you want a newer version.
Meld
H3 Practical steps
- Go to the Meld website and find the download section for the current stable release.
- Choose the Windows installer (not the source
.tar.xz, which is for building from source). - Run the downloaded
.exeand follow the setup wizard; accept the default install location unless you have a reason to change it. - Launch Meld from the Start menu to confirm it opens.
H3 Things worth knowing before you start
- No auto-update: you won't be prompted when a new version appears, so check the site occasionally.
- No portable mode: you can't easily drop Meld on a USB stick and run it without installing.
- Version control integration: Meld works with Git, Mercurial, Bazaar and Subversion, and can be wired in as
git mergetool. On Windows this usually means Git for Windows must already be installed and on your PATH. - Dependencies are bundled: the installer handles the Python/GTK runtime, so you don't need to install Python 3.6, GTK+ 3.22 or the other libraries listed for source builds.
H3 If the installer route doesn't suit you Meld is packaged for most Linux/Unix distributions and is on Flathub, which is the smoother path if you also work on Linux. macOS is a different story: Meld's page states it isn't officially supported there, though semi-official builds exist via Homebrew, MacPorts and Fink, and older third-party binaries may have trouble with recent macOS versions. If you need a cross-platform diff tool and macOS matters to you, that limitation is worth weighing before committing to Meld.
A reasonable next step: install it, then open two versions of a file you're actively working on and try the change-navigation buttons — that's the fastest way to see whether Meld's workflow fits how you review edits.
How does Meld integrate with Git for merge conflict resolution?
Meld acts as a visual merge tool that Git can launch when conflicts occur, rather than replacing Git's own merge logic. Git still decides what conflicts exist; Meld gives you a side-by-side (or three-pane) view to resolve them.
What the integration actually does
- Git calls Meld as an external merge tool via
git mergetool. Meld then opens a three-way view: your current branch's version, the common base, and the incoming branch's version. - You edit the middle/result pane directly, using the live comparison highlighting to see which lines came from where, and Meld's conflict-handling controls to pick a side or combine changes.
- Once you save and close, Git marks the file as resolved so you can stage and commit normally.
- Meld also shows version-control state and lets you review changes, commit, and push from inside the tool, with support for Git alongside Mercurial, Bazaar, and Subversion.
A concrete workflow
git merge feature-branchproduces conflicts.git mergetoollaunches Meld for each conflicted file.- Resolve in the three-pane view, save, and exit.
git committo finish the merge.
Who benefits, and the trade-offs
This suits developers who find raw conflict markers hard to read, especially when conflicts span many lines or files. The three-way view with base-version display is genuinely useful for judging intent, not just text. The trade-offs: it's a GUI, so it's awkward over SSH or in headless environments; Meld is packaged for most Linux distributions and Flathub, with a Windows installer, while macOS support is not yet official. If you work mostly in a terminal, a TUI merge tool may fit better.
Next step: install Meld, then run git config --global merge.tool meld so git mergetool picks it up automatically. See Meld for installation details.
Can Meld compare entire folders or directories, not just individual files?
Yes. Meld is built for both files and directories: its folder comparison identifies and manages missing or modified files across folders, and you can drill down from a folder view into a file comparison for a detailed look at differences. It also lets you ignore certain files or folders so the comparison stays focused on what matters.
What folder comparison is good for
- Checking a backup or exported copy against the original to see what is missing, extra or changed.
- Comparing two working copies, branches or release trees before you commit or package them.
- Reviewing a version-controlled project, since Meld supports Git, Mercurial, Bazaar and Subversion and can show version control states alongside the differences.
- Spotting renamed, moved or deleted files across large trees without opening each file by hand.
Trade-offs to expect
Folder comparison is best at showing structure — which paths differ — while content-level editing happens when you open a file pair. Filtering is your main lever: without ignoring build output, logs, caches or generated files, a directory diff can be dominated by noise. Two- and three-way comparison is available for both files and directories, so a three-way folder view is useful for understanding a merge, but it is also where conflicting changes become hardest to read.
A practical next step
If you are mid-merge, run a folder comparison of your working tree against the branch you are merging, ignore generated directories, then open only the files that show as modified or conflicted. On Linux, Meld is packaged for most distributions and available on Flathub; Windows users install from the provided installer, and macOS is not officially supported, though semi-official builds exist via Homebrew, MacPorts or Fink. For a quick orientation on the project, see Meld.
Is Meld available for macOS, and how do I install it?
Meld is not officially supported on macOS. The project's own installation notes say macOS is not yet supported, and that only semi-official builds exist, with the hope of fuller integration later. In practice that means you can run it, but you should treat it as community-maintained rather than a first-class platform.
How macOS users typically install it
The two common routes are package managers:
- Homebrew:
brew install meld(or a cask variant, depending on how the formula is packaged at the time). - MacPorts:
port install meld. - Fink is also listed as an option, though it is a much older ecosystem and less commonly used today.
Older third-party binaries circulate as well, but the project warns they may have issues with recent versions of macOS, so prefer a package manager that can pull a current build.
What to expect after installing
Meld is a GTK application, and its requirements list GTK+ 3.22, GLib, PyGObject, GtkSourceView 4.0, pycairo and Python 3.6. On macOS, GTK apps need the GTK stack present, which package managers usually handle as dependencies. Even so, expect the occasional rough edge: theme integration, font rendering, and file-dialog behaviour are the usual friction points when a Linux-targeted GTK app runs on macOS.
If your goal is simply comparing files or resolving a merge conflict, and you would rather avoid the GTK dependency, native Mac tools or your editor's built-in diff view may be less trouble. Choose Meld on macOS when you specifically want its three-way merge view, folder comparison, or version-control integration and are willing to accept an unsupported setup.
A practical next step
Check whether Homebrew or MacPorts already has a current formula before hunting for standalone binaries:
For background on what Meld does and its official platform support, see Meld.
What are the system requirements for running Meld?
Meld's listed requirements are modest by modern standards, and they matter most if you plan to build it from source rather than install a packaged version.
Stated requirements
- Python 3.6
- GTK+ 3.22
- GLib 2.36
- PyGObject 3.36
- GtkSourceView 4.0
- pycairo
These are the dependencies named on the Meld site for running the application, with the current README covering development and build requirements specifically.
What this means in practice
On Linux and Unix distributions, Meld is packaged, so your package manager resolves these dependencies for you. Windows users are directed to an installer, which likewise bundles what is needed. That is the low-friction path for most people.
The requirements become your problem mainly in two situations: compiling from source, or running on a system whose GTK stack is older than the versions above. If you are on an older long-term-support distribution, check your GTK and PyGObject versions before attempting a source build — a mismatch there is the usual cause of a failed build rather than anything Meld-specific.
Platform notes worth knowing
- macOS is not officially supported. Semi-official builds exist via Homebrew, MacPorts and Fink, but the project describes full integration as a future hope rather than a current guarantee.
- Windows has an installer, but no automatic updates and no portable installs.
- Python 3.6 is a fairly old baseline, so most current systems will exceed it comfortably.
Next step
If you just want to run Meld, install it through your distribution's package manager or the Windows installer and skip the dependency list entirely. Only consult the requirements in detail if you are building from a git clone — in which case the README is the authoritative source, since it tracks changes more closely than the summary above.
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