Text Diff Checker

Paste the original version into the first text panel.

Paste the updated version into the second panel.

Review the comparison results.

Check the summary to see how many lines were added, removed, and unchanged.

Adjust the comparison options if you want to ignore certain differences.

Hide or reveal unchanged lines to focus on the changes.

Copy the plain-text diff or download it for later reference.

Compare two versions of text line by line with this free online Text Diff Checker. Paste your original text into one panel and the revised version into the other. The tool identifies added, removed, and unchanged lines, then provides a summary so you can see what changed.

It is useful when reviewing edited drafts, checking code snippets, comparing configuration files, or finding differences between copied text. You can adjust how lines are compared, hide unchanged lines, and copy or download the resulting plain-text diff.

A text diff shows the differences between two versions of text. It helps you identify which lines were added, removed, or left unchanged.

For example, you might compare an earlier version of an article with an edited draft, check whether a code snippet has changed, or verify that a configuration file contains the expected lines.

This tool performs a line-by-line comparison. It does not provide word-level or character-level highlighting within a line. If a sentence changes, the comparison identifies the affected line rather than marking individual changed words or characters.

The tool groups lines into three categories:

Added lines: Lines present in the second text but not matched in the first.

Removed lines: Lines present in the first text but not matched in the second.

Unchanged lines: Lines that match between the two versions under the selected comparison settings.

A summary gives you an overview of these changes without requiring you to inspect both texts manually.

A simple comparison example

Suppose the original text is:

Welcome to ToolboxShelf.

Find useful online tools.

Compare your results.

And the updated text is:

Welcome to ToolboxShelf.

Explore useful online tools.

Compare your results.

Save your time.

The comparison identifies:

Welcome to ToolboxShelf.

- Find useful online tools.

+ Explore useful online tools.

Compare your results.

+ Save your time.

Here, one line was removed, one replacement line was added, and one additional line was inserted. The unchanged lines remain visible in this example to show the surrounding context.

Different comparison settings can help you focus on meaningful changes rather than minor formatting differences.

Ignore letter case

When enabled, uppercase and lowercase letters are treated as equivalent during comparison.

For example, ToolboxShelf and toolboxshelf are treated as matching lines. Their original text is not necessarily rewritten; the option changes how the comparison evaluates them.

Ignore leading and trailing whitespace

This option ignores spaces and tabs at the beginning or end of a line when comparing it.

For example, these lines can be treated as equivalent:

Welcome to ToolboxShelf.

Welcome to ToolboxShelf.

Whitespace inside the line is not ignored by this option.

Ignore blank lines

When enabled, empty lines are excluded from the comparison. This is useful when one version contains extra spacing between paragraphs or code sections.

Hide or show unchanged lines

You can hide unchanged lines to focus on additions and removals, or show them again when you need to understand the surrounding context.

These display options do not change the original text in the input panels.

After comparing the two texts, you can:

Copy the plain-text diff to your clipboard.

Download the comparison as a text file.

Review the result before sharing or saving it.

The exported diff is a readable text representation of the line changes, not a formatted document with interactive highlighting.

The limit applies to the two texts together, not separately to each panel. If your comparison exceeds the limit, shorten the input or divide it into smaller sections before comparing.

Editing and proofreading: Compare an original draft with a revised version to find changed paragraphs or lines.

Code review: Check differences between two code snippets or versions of a source file.

Configuration checks: Identify changed, added, or missing settings in configuration text.

Copied text verification: Compare two copied passages to check whether their lines match.

Content updates: Review changes to product descriptions, documentation, or website copy.

The tool compares the text you paste into it. It does not read document uploads, retrieve Git history, or resolve merge conflicts.