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Text Diff

Compare two texts and highlight added, removed and unchanged lines.

Local processingYour input stays hereSimple controls

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Original text
0 characters · 0 bytes
Modified text
0 characters · 0 bytes

Text stays in this tab. Maximum 200,000 characters. Comparison is line-based, with up to one million line comparisons.

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Processed locally in your browser

Your input does not need to be uploaded to an EvryNest server. Nothing is saved automatically.

How It Works

  1. 1
    Enter two versions

    Paste the original and modified text side by side.

  2. 2
    Compare by line

    Run the line-based difference calculation.

  3. 3
    Review changes

    Read labeled additions, removals and unchanged lines.

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Frequently Asked Questions

How does Text Diff work?

Comparison is line-based and uses a longest-common-subsequence algorithm. It supports up to one million line comparisons.

Does this tool upload or save my input?

Core processing happens locally in this browser tab. Input and output are not sent to a processing server or stored automatically. Copy and download only occur when you request them.

What happens with large or invalid inputs?

Text tools accept up to 200,000 characters. Numeric sorting and diff apply additional checks. Invalid input displays an error so you can correct it.