Text Diff Checker

Compare two texts side by side and highlight all the differences.

Added Removed Changed
Original Text
Modified Text
Tips
  • Green lines are additions, red lines are deletions.
  • Use "Ignore Case" to compare text regardless of capitalization.
  • The similarity percentage shows how close the two texts are.

What is Text Diff Checker?

A text diff checker is an online tool that compares two blocks of text side by side and highlights every difference between them, including added characters, deleted words, and modified lines. Writers, developers, editors, legal professionals, and content teams use a text diff checker to identify changes between document versions, review code modifications, audit content revisions, and verify that only intended edits were made between drafts. The tool marks insertions and deletions with distinct colours so that every divergence between the two versions is immediately visible.

How to Use Text Diff Checker

1
Open a trusted text diff checker in your web browser on any device
2
Paste your original text into the left input panel. This serves as the baseline version for the comparison.
3
Paste the revised or updated text into the right input panel
4
Click Compare or Check Diff. The tool runs the diff algorithm and highlights all differences between the two versions instantly
5
Review the colour-coded output. Most tools mark added text in green and deleted text in red, making it straightforward to check text diff line by line
6
To diff check text file content from separate files, copy and paste each file's content into the respective panels, or use a tool that supports direct file upload for larger documents.

Why Use Text Diff Checker?

Content revision review: Editors and content managers use a text diff checker to verify exactly what changed between a brief and its delivered draft, or between two versions of published content.
Legal and contract management: Legal teams diff check text file versions of contracts and agreements to ensure no clauses were altered, added, or removed without authorisation.
Code review support: Developers use text comparison tools to review changes in configuration files, scripts, and plain-text assets outside of version control systems.
Plagiarism and originality checks: Comparing a submitted document against an original source with a check text diff tool quickly reveals copied or lightly reworded sections.
Academic proofreading: Students and researchers use a text diff checker to compare essay drafts and confirm all feedback from supervisors has been addressed correctly.
Translation quality assurance: Localisation teams diff check text file versions of translated content against source strings to detect missing segments or unintended additions.

Frequently Asked Questions

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