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  3. Text Diff & Compare Tool
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Text Diff & Compare Tool

Compare texts with side-by-side and unified diff views, line-by-line or character-level comparison, change statistics, and export to patch file

Need to spot what changed between two versions of a document? Paste the original and modified text side by side and this tool highlights every addition, deletion, and modification instantly. Character-level highlighting catches even the smallest typos that line-level diffs would miss.

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Text Diff & Compare Tool: a worked example

A teammate pasted an "updated" config back to you and you need to see exactly what they changed before applying it.

Comparing

Left:  timeout = 30
Right: timeout = 60
       retries = 3
Text Diff & Compare Tool produces

Diff

  timeout = 30        →  ~ timeout = 60   (changed)
                          + retries = 3   (added)

A line/word-level diff highlights changed, added, and removed segments instead of making you eyeball two blocks, here it isolates one value change and one new line. It runs entirely client-side, so pasting an internal config to compare it does not leak that config anywhere.

What is Text Diff & Compare Tool?

Need to spot what changed between two versions of a document? Paste the original and modified text side by side and this tool highlights every addition, deletion, and modification instantly. Character-level highlighting catches even the smallest typos that line-level diffs would miss.

How to use

  1. 1Paste the original text in the left panel
  2. 2Paste the modified text in the right panel
  3. 3Review the highlighted differences
  4. 4Toggle between side-by-side and unified view as needed

Key features

  • Side-by-side and unified diff views
  • Character-level diff highlighting within changed lines
  • Change statistics (added, removed, modified line counts)
  • Ignore-whitespace option for cleaner comparisons
  • Line number display for easy reference

Common use cases

  • Reviewing code changes

    Compare two versions of source code to catch bugs and verify logic before committing or merging.

  • Tracking document revisions

    See exactly what was edited between drafts of contracts, reports, or articles.

  • Debugging config differences

    Compare configuration files across environments to pinpoint missing or changed settings.

  • Verifying translation accuracy

    Compare original and edited translations side by side to confirm nothing was accidentally omitted.

How it works

The comparison engine computes the shortest edit script between your two inputs, then renders the differences with color-coded highlights. You can switch between side-by-side and unified (git-style) views depending on your preference, and change statistics give you a quick summary of how many lines were added, removed, or modified.

Frequently asked questions

What is the difference between side-by-side and unified view?

Side-by-side shows the original and modified text in parallel columns. Unified view displays both in a single column with + and - markers, similar to git diff output.

Can I compare entire files?

Yes, copy the contents of each file and paste them into the left and right panels. There is no strict size limit, though very large texts may take a moment to process.

Does ignoring whitespace affect the results?

When enabled, the ignore-whitespace option treats differences in spaces, tabs, and trailing whitespace as non-changes, so only meaningful content differences are highlighted.

Private by design

Your text is processed locally in the browser. Nothing you paste or open is transmitted or logged.