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Paste both versions and click Compare Text// compare two text blocks and highlight every change
Compare two text blocks online and highlight added, removed, and changed lines with clear diff stats for writing, code, docs, edits, QA, and team reviews.
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Paste both versions and click Compare TextAdd the first version into the left input field.
Add the revised version into the right input field.
Review line changes, word highlights, and summary counts.
Text Diff Checker compares two blocks of plain text and marks unchanged, added, removed, and modified lines so you can understand revisions faster.
No. The comparison runs in your browser. The PHP API fallback also accepts pasted text only when directly requested.
Yes. It works well for snippets, configs, docs, markdown, and plain code blocks where line-level changes matter.
A changed line exists in both versions at the same position, but the content is not identical.
Yes. Enable Trim whitespace to compare lines after removing leading and trailing spaces.
Yes. Enable Ignore empty lines to focus on meaningful text lines only.
Yes. Use Download to save a plain text summary of the comparison result.
A text diff checker is a comparison tool that helps you see exactly how one block of text differs from another. Instead of reading two versions manually and trying to remember every sentence, line, or punctuation change, you paste both versions into the tool and review the highlighted result. This is useful for writers, editors, developers, marketers, students, and anyone who works with repeated versions of the same content.
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Text changes are easy to miss when they are small. A single removed word can change the meaning of a paragraph. An extra setting in a configuration file can affect a build. A changed heading can affect search intent. A diff checker makes those changes visible by turning a vague review task into a structured comparison. You get a list of unchanged lines, modified lines, added lines, and removed lines, plus summary counts that make the size of the change easier to understand.
Online comparison is convenient because it does not require a full code editor, version control system, or desktop application. When you only need to compare two pasted snippets, a lightweight browser-based diff tool is faster than opening a repository or installing software. You can compare an email draft against a final version, a contract clause against a revision, a README section against a published page, or a configuration block against a backup.
This tool is designed for quick checks. It focuses on plain text, line-level differences, and readable output. The original text goes on the left, the changed text goes on the right, and the result shows how the two versions differ. Added lines appear as new content, removed lines appear as content missing from the changed version, and changed lines show both sides for easy review.
A line diff is the clearest way to compare structured content. It treats each line as a unit and reports whether that line stayed the same, changed, was added, or was removed. This is especially useful for code snippets, lists, environment files, changelogs, CSV-like text, markdown notes, and configuration blocks.
Word-level highlights add more detail inside changed lines. When two lines are similar but not identical, the checker can mark changed words so you do not have to scan the entire line by eye. This is helpful for editorial review, proofreading, and small content updates where the difference may be a single word, number, or phrase.
Whitespace can be meaningful in code and configuration files, but distracting in editorial text. The Trim whitespace option compares lines after removing leading and trailing spaces. This helps when a difference is caused only by indentation or accidental spaces at the edges of a line. The Ignore empty lines option removes blank lines from the comparison, which can make long text easier to review when paragraph spacing is not important.
For code or indentation-sensitive formats, leave whitespace options off. For prose, notes, and copied web content, enabling them can reduce noise. The best setting depends on what you are comparing and whether formatting differences matter for your task.
The summary cards show how many lines are unchanged, changed, added, and removed. The diff table then shows each line with the original version on the left and the changed version on the right. Unchanged lines are neutral. Changed rows show content on both sides. Added rows show content that appears only in the changed text. Removed rows show content that existed only in the original text.
After reviewing the output, you can copy the summary or download a plain text report. This makes it easier to share a comparison with a teammate, keep a record of edits, or paste the result into a review comment.