Text Diff Tool: Compare Two Texts Line by Line Online
The Text Diff tool compares two text inputs line by line and shows what was added, removed, or left unchanged. It uses the longest-common-subsequence algorithm to identify differences, displays additions in green and deletions in red, and provides a count of changes. Paste or drop both versions into the browser-based tool, run the comparison, and step through the results.
The Text Diff tool compares two text inputs line by line, helping you see what changed between versions. It uses the longest-common-subsequence algorithm to identify differences, renders additions in green and deletions in red, and displays a count of changes. Paste or drop both texts into the tool, run the comparison, and step through the results.
The comparison focuses on lines: it identifies additions and removals between the two inputs rather than converting one format into another. There are no configuration options described for the comparison; the available workflow is to provide both versions, run the diff, and review the highlighted results. This makes the tool useful when you want a clear view of edits without manually scanning two blocks of text.
Plain text can contain code, configuration, notes, or other written content. Comparing two versions helps during code review, file checks, and editing because changes that are easy to overlook can stand out in the diff. The green and red highlights distinguish additions from deletions, while the change count gives you a compact measure of the comparison.
Text Diff runs entirely in your browser, so your input is processed on your device and is not uploaded, stored, or sent to a server. It is free, and once the page has loaded, it works offline without a server connection. Developers and DevOps engineers can use it to check text changes quickly, whether they are reviewing a refactor, inspecting a file, or comparing revisions.
Step 1: Paste or drop the first text into the input area. Use the version you want to compare as your starting point.
Step 2: Paste or drop the second text into the other input area. The tool compares the two text inputs line by line.
Step 3: Run the comparison to generate the diff. Added lines appear in green, while deleted lines appear in red.
Step 4: Review the change count, then step through the differences to see what changed between the two versions.
Use case: Compare two versions of a text file before reviewing or committing changes. The line-by-line diff makes additions and deletions easier to spot.
Use case: Check whether a refactor left a text file unchanged. If it did not, the comparison helps you find the line that differs.
Use case: Find a small difference between two files that look identical at a glance. Color-coded changes make the comparison easier to scan.
Use case: Review edits to configuration text before applying them. A line-level comparison can help you see which lines were added or removed.
Use case: Compare a draft with its revised version to check what changed. Step through the differences instead of rereading both texts from the beginning.
Use case: Inspect generated text against an earlier version. The change count and colored additions and deletions provide a quick view of the differences.