Free · Fast · Privacy-first

Git Diff Online, Visual Code Comparison Without the Terminal

The terminal git diff output works, but it is not always the most readable format for reviewing changes, especially when sharing with teammates or reviewing complex multi-file changes.

⚡

Visual diff UI, no terminal commands needed

🔒

Colour-coded additions and deletions

✨

Great for sharing diffs with non-terminal users

⚡

Works for any language git tracks

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

FreeNo signupWhite-label

Add this Diff Checker to your website

Drop the Diff Checker into any page — blog post, product docs, intranet, school portal — with a single line of HTML. Your visitors get the full tool, processed entirely in their browser. No backend, no uploads, no signup.

Files stay 100% in the visitor's browser
Responsive — adapts to any container width
Free forever, no API key needed

Embed code

<iframe
  src="https://www.fixtools.io/developer/diff-checker?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="Diff Checker by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

<iframe
  src="https://www.fixtools.io/developer/diff-checker?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="Diff Checker by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

A Visual Git Diff for Developers Outside the Terminal

Git is the standard tool for version control, and git diff is how most developers examine changes between commits, branches, and working-tree states. But the terminal diff output has real limitations in several common situations. It requires a working Git environment on the machine where the review happens. It is less accessible to non-technical stakeholders such as designers, product managers, and clients who need to understand what changed. And the raw unified diff format, with its alternating plus and minus lines and diff headers, can be harder to read for long files with many changes spread throughout. When you need to share a diff with someone who does not use Git, or when you are working on a machine without a repository set up, a visual browser-based tool closes that gap effectively.

FixTools Diff Checker produces output equivalent to the visual diff view in GitHub or GitLab pull requests. It uses the Myers diff algorithm, which is the same algorithm underlying git diff, to compute the minimum edit script between two file versions and highlight all changes. The output uses the same colour convention as most Git platforms: green for additions and red for deletions. Unlike raw unified diff output, which uses +/- notation and context line headers that can be harder to scan in bulk, the FixTools visual diff aligns corresponding changed lines across both panels and highlights differences within each changed line at character granularity. This makes reviews faster and reduces the chance of missing a subtle intra-line change.

To get clean file content from your git history without including raw unified diff notation, use the git show command with the format git show <commit-hash>:path/to/file. This outputs the exact file content at any specified commit with no diff markers included. On Mac you can pipe the output directly to your clipboard with pbcopy, and on Windows with clip. This approach gives you the raw file content that produces a clean, readable visual diff in FixTools rather than the +/- notation of raw unified diff output that the tool was not designed to parse.

A note on three-way merges is worth making here because Git users sometimes expect a browser diff tool to handle them. Three-way merges compare a common ancestor against two divergent branch tips and produce conflict markers when both sides changed the same region. That model is handled by git merge and dedicated tools like kdiff3 or Beyond Compare. FixTools is a two-way diff: an original and a revised version. To inspect a Git merge visually, extract the file from each of the three commits with git show and run two separate comparisons, one for each branch against the common ancestor. The whitespace handling matches git diff defaults: every byte counts unless you normalise inputs first. Because the entire pipeline is client-side, the tool is suitable for reviewing diffs of files containing credentials, internal endpoints, or unreleased code that should never reach a third-party service.

Git diff documentation Myers diff algorithm paper

How to use this tool

💡

Copy the two versions of a file from your git history (using git show or git checkout) and paste them into the Diff Checker for a visual side-by-side comparison.

How It Works

Step-by-step guide to git diff online, visual code comparison without the terminal:

1
Get your two file versions from git
Run git show <commit-hash>:path/to/file in your terminal for each version you want to compare. Copy the output of each command to use as the input for each diff panel.
2
Open Diff Checker
Navigate to the FixTools Diff Checker in your browser. No Git installation or account is needed on the reviewing machine.
3
Paste original version
Paste the older or base-branch file content into the left panel. This should be raw file content, not unified diff notation.
4
Paste updated version
Paste the newer or feature-branch file content into the right panel. Again, use raw file content from git show rather than formatted diff output.
5
Review the visual diff
Click Compare for a colour-coded, readable diff with character-level change highlighting. You can share this view as a screenshot or PDF without requiring the recipient to have Git installed.

Real-world examples

Common situations where this approach makes a real difference:

Sharing a code change with a non-technical stakeholder

A developer needs a product manager to approve changes to a marketing page template before deployment. Rather than asking the PM to interpret a terminal diff with +/- lines and diff headers, the developer copies both file versions with git show, pastes them into the Diff Checker, and sends a screenshot of the colour-coded visual output. The product manager can confirm the approved changes were made correctly without needing Git access or any terminal knowledge.

Reviewing a specific file from a large pull request

A code review includes fifteen changed files, but a reviewer wants to focus closely on one complex configuration file without the distraction of the other changed files in the PR. They extract the base and head versions of the specific file using git show with the relevant commit hashes, paste both into the Diff Checker, and get a focused, isolated diff of just that file with full character-level highlighting and no other changes visible.

Comparing file versions across unrelated repositories

A developer maintains two forks of an open-source project and wants to understand exactly how their customised version of a specific utility file differs from the current upstream version. Because the forks are in separate repositories that do not share a remote, git diff cannot compare them directly. Pasting both file contents into the Diff Checker gives an immediate cross-repository comparison without any merge or fetch operations.

Auditing a hotfix against the main branch

After an emergency hotfix was applied directly to production without going through a normal pull request process, a tech lead needs to create a formal record of exactly what changed. Using git show to extract the pre-hotfix and post-hotfix versions of the affected files, the lead diffs them in FixTools and uses the visual output to create a post-incident change record that can be attached to the incident ticket and included in the audit log.

Pro tips

Get better results with these expert suggestions:

Use git show to extract clean file content

The cleanest way to get file content for a visual diff is the command git show <commit-hash>:path/to/file, which outputs the exact file content at that commit with no diff notation or commit metadata included. On Mac you can pipe the output to your clipboard with pbcopy, and on Windows with clip. This produces raw file content that the Diff Checker can display as a proper visual diff with aligned changed lines, rather than attempting to parse raw unified diff notation with its +/- markers.

Compare stash entries without applying them

To preview what a git stash entry contains before deciding whether to apply it, use the command git show stash@{0}:path/to/file to extract the stashed version of a specific file. Paste that output alongside the current working tree version of the file into the Diff Checker for a visual comparison. This lets you review the stash contents and assess the impact before applying or dropping it, without the risk of applying changes you have not yet reviewed.

Diff configuration files from different environments

For comparing environment-specific configuration files that live in separate repositories or different deployment targets, copy the file content from each environment manually and paste both into the Diff Checker. This is often the fastest approach for comparing a staging configuration against a production configuration when the files are managed in separate repositories or deployment pipelines and cannot be compared directly with a single git diff command.

Save visual diffs as PDFs for audit logs

For changes to production systems that require a formal audit trail, run the comparison in FixTools and save the visual output as a PDF using the browser print function. Include the commit hashes or version identifiers and the date of the comparison in the document title or a header note. This creates a human-readable, permanent record of the specific code changes that can be attached to a change management ticket, incident report, or compliance file.

FAQ

Frequently asked questions

The FixTools visual diff shows the same information as git diff but in a clean, browser-based interface with colour-coded highlights and character-level change highlighting within changed lines. It is easier to read at a glance, shareable as a screenshot or PDF, and does not require Git or a terminal to be installed on the machine where the review happens. It is particularly useful for sharing diffs with reviewers who are not comfortable with terminal output or unified diff notation.

Yes. Copy the two versions of any file from your pull request using git show with the base and head commit hashes, then paste both into the Diff Checker for a visual review outside the PR interface. This is especially useful for reviewing specific files in isolation from a large PR with many changed files, or for sharing the diff of one specific file with a reviewer who does not have access to your Git platform.

It complements it rather than replacing it. FixTools is most useful when you want to compare specific file versions outside of GitHub, share a diff without giving someone repository access, compare files that live in separate repositories, quickly compare pasted snippets that do not have a repository context, or when the GitHub diff view is not accessible because you are working in a restricted environment.

Yes. Use git show <branch-name>:path/to/file to extract the file content from each branch, then paste both versions into the Diff Checker. This gives you a clean visual comparison between any two branches in any repository, whether they share a common history or not, without needing to check out either branch in your working directory.

You can paste raw unified diff output into the panels, but the tool produces its best visual output when you paste the two raw file contents rather than the diff notation itself. With raw file content as input, the tool can align changed lines and highlight intra-line differences at character granularity. With unified diff notation as input, the +/- markers appear as literal content in the diff and the output is harder to read than the original terminal diff.

Yes. If you are reviewing code that was emailed to you, shared through a document system, or sent as a file attachment without repository access, paste both the original and updated versions into the Diff Checker for an immediate visual diff. This is also practical for reviewing changes made by contractors or external contributors who are not on your organisation's Git platform or whose access has been provisioned separately.

Run git show <commit-hash>:relative/path/to/file in your terminal, replacing commit-hash with the full or abbreviated SHA of the commit and the path with the file's path relative to the repository root. The command outputs the exact file content as it existed at that commit, with no diff markers or commit metadata. Copy the output to your clipboard and paste it directly into the Diff Checker panel.

No. The Diff Checker is a text-based comparison tool and requires plain text as input. Binary files such as compiled executables, images, database files, and other non-text formats cannot be compared meaningfully as text. For these file types, use git's built-in binary diff support or a format-specific comparison tool designed for that binary format.

Start by confirming you pasted raw file content rather than the output of git diff itself. The tool aligns lines from each side and does not parse the +/- notation that git diff produces by default. Use git show commit:path to get clean file content. Next, check that both versions use the same line endings, since cross-platform Git checkouts can introduce CRLF on Windows and LF on macOS or Linux. Configure core.autocrlf consistently or normalise endings before pasting. Finally, if your repository uses .gitattributes filters or smudge scripts that transform file content on checkout, the working tree version may differ from what git show returns, which can produce a confusing diff if you mix the two.

The platform-native diff viewer on GitHub, GitLab, or Bitbucket remains the primary place for code review with inline comments and approval gates. The browser tool is for situations where the platform diff is not suitable: reviewing one specific file in a large pull request without the noise of unrelated changes, sharing a visual diff with a stakeholder who has no repository access, or comparing two file versions across separate forks. Extract each version with git show, paste both into the panels, and you have a portable visual diff that you can screenshot into a Slack thread, save as a PDF for an audit log, or embed in a post-incident review document without exposing the repository itself.

The output mirrors the visual convention used by GitHub and GitLab pull request views, which is more readable than the raw +/- notation of terminal git diff. Green lines are content present in the right panel and absent in the left, treated as additions in the change. Red lines are content present in the left and absent in the right, treated as deletions. Modified lines appear as paired red and green rows at the same vertical position in side-by-side view. Within each changed line, the specific characters that differ from the matched line on the opposite side are highlighted in a brighter shade, providing the character-level precision that terminal git diff does not show by default.