How to Use
- 1.
Paste the earlier version into the Original text area.
- 2.
Paste the updated version into the Modified text area.
- 3.
Enable Ignore letter case or Ignore whitespace when those differences are not important.
- 4.
Click Compare text to calculate the line-by-line changes.
- 5.
Switch between side-by-side and inline views to review the result.
- 6.
Copy the difference report or download it as a TXT file.
Features
Compare two plain-text versions line by line
Highlight added, removed, and unchanged lines
Side-by-side and inline difference views
Optional case-insensitive comparison
Optional whitespace normalization
Added, removed, and unchanged summary counts
Copyable and downloadable diff report
Private browser-based processing
Frequently Asked Questions
How do I compare two texts online?+
Paste the first version into Original text and the second version into Modified text, choose any ignore options, and click Compare text.
What do the diff colors mean?+
Green identifies lines added to the modified text, red identifies lines removed from the original, and uncolored lines are unchanged.
Can I ignore capitalization differences?+
Yes. Enable Ignore letter case so differences in uppercase and lowercase letters do not count as changed lines.
Can the checker ignore extra spaces and tabs?+
Yes. Ignore whitespace normalizes surrounding and repeated whitespace during comparison while preserving the displayed source text.
Why does a moved line appear as removed and added?+
The checker compares line order. A line moved to another position is represented as a removal from its old position and an addition at its new position.
Can I compare code with this tool?+
Yes, it works with plain-text code snippets and configuration files. A version-control diff is better for large repositories or merge workflows.
Can I save the comparison result?+
Yes. Copy the diff report to your clipboard or download the complete report as a TXT file.
Is my text uploaded or stored?+
No. Text comparison, report creation, copying, and downloading run locally in your browser.
About this tool
Free Text Diff Checker Online
Text Diff Checker Online is a free browser-based comparison tool for finding differences between two versions of plain text. Paste an original version and a modified version to identify lines that were added, removed, or left unchanged. The comparison is useful for articles, website copy, code snippets, configuration files, contracts, notes, product descriptions, email templates, SEO metadata drafts, and other line-based content. The side-by-side view separates the original and modified versions so you can scan each document independently. Removed lines are highlighted in red on the original side, while new lines are highlighted in green on the modified side. Switch to the inline view when you prefer one continuous change report with plus and minus markers. Summary counters show the number of added, removed, and unchanged lines. Enable Ignore letter case when capitalization differences should not count as changes. For example, WebToolsEdge and webtoolsedge can be treated as equal while the displayed text keeps its original spelling. Ignore whitespace is helpful when copied indentation, extra spaces, or tabs are not meaningful. It normalizes surrounding and repeated whitespace for comparison without rewriting either input. This online text comparison tool uses a line-based longest common subsequence method. It preserves the order of matching lines and builds a readable difference report around them. A moved line may therefore appear once as removed and once as added, which accurately represents its changed position. The tool does not modify your source text. Writers can compare edited drafts, developers can review small snippets, SEO teams can inspect title or description revisions, and support teams can check template updates. For large software repositories, use a dedicated version-control system that understands files, commits, and merge conflicts. This tool is designed for quick, focused comparisons in the browser. All comparison work happens locally on your device. Your text does not need to be uploaded to WebToolsEdge. After reviewing the result, copy a plain-text diff report or download it as a TXT file for documentation, review, or sharing.
Need to apply the same edit throughout a document? Use Find and Replace Text Online. For list cleanup before comparing versions, remove repeated rows with the Duplicate Line Remover, or browse all Text Tools.