Text Diff Checker

• 100% Free

  Core tools stay free with no paywall to unlock basics.

• No Registration Required

  Open a tool and start immediately - no account needed.

• Privacy First

  We avoid unnecessary collection and keep processing local when possible.

• Browser Processing

  Most tools run in your browser so your input never needs a server round-trip.

• Fast & Secure

  HTTPS everywhere with instant, client-side results for everyday tasks.

• Mobile Friendly

  Layouts and controls are built for phones, tablets, and desktops.

• Updated Regularly

  Tools and content are improved continuously as the platform grows.

Key Features

• Side-by-side comparison

  Paste original and modified text to see additions, deletions, and unchanged segments instantly.

• Line or word diff

  Switch between line-by-line and word-by-word modes depending on whether you are reviewing prose or code.

• Flexible matching

  Ignore whitespace or case when you care about content changes rather than formatting.

How to Use

1. 1

   Paste both versions

   Add the original text on the left and the updated text on the right.

2. 2

   Choose diff options

   Pick line or word mode and toggle ignore whitespace or ignore case as needed.

3. 3

   Review the diff

   Inspect stats, colored rows, and the unified report. Copy or download results to share.

Use Cases

• Reviewing copy edits before publishing

  Compare an original draft against an edited version to see exactly which sentences or words changed before it goes live.

• Auditing configuration file changes

  Diff two versions of a config or environment file to confirm only the intended settings were modified.

• Confirming a find-and-replace worked correctly

  Compare text before and after a bulk edit to verify the replacement only touched the intended occurrences.

• Comparing policy or legal document revisions

  Check whether a specific clause or paragraph changed between two versions of a policy or agreement.

Examples

Original: Version 1.0 · Modified: Version 2.0

1 line removed, 1 line added, other lines unchanged

Word mode · jumps → leaps

1 word removed, 1 word added

Ignore case enabled · ERROR vs error

No differences found

Benefits

• ✓Review copy edits before publishing
• ✓Compare config snippets or log excerpts quickly
• ✓Share a readable diff report with teammates
• ✓Keep sensitive drafts on your device
• ✓No account or upload required

Best Practices

• Use line mode for multi-line documents, code, and lists.
• Use word mode for short sentences or single-line edits.
• Enable ignore whitespace when formatting changed but content did not.
• Load the example first to see how additions and deletions are colored.

Common Mistakes

• Comparing line mode output when the real change is inside one long wrapped line.
• Forgetting that trailing newlines create an extra empty line in line mode.
• Expecting character-level diff - this tool compares lines or words only.
• Pasting inputs larger than 200,000 characters per field.

Privacy Notice

All diffing happens in your browser after the page loads. ToolMint does not upload, store, or transmit the text you paste into the tool.

About This Tool

Frequently Asked Questions

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