Compare text

Diff Viewer

Visually compare differences between two text blocks and instantly identify additions, removals, and changes.
Line breaks and whitespace differences are also highlighted, helping you catch even subtle modifications.

This tool is useful for reviewing documents, proofreading content, and checking revisions in source code or specifications.
All comparisons are performed directly in your browser, and no text is sent to any server.

Old text

New text

Result

Guide

How to use & features

Paste the original text on the left and the modified text on the right, then click “Show diff.”
Additions appear in green and removals in red, making changes easy to spot.
After viewing, use the copy buttons under each pane to share either version.
Very large inputs may take a few seconds to render—please keep the tab open until it finishes.

Samples

Sample input & output

Compare two short files

Input

Left
console.log("hello");
Right
console.log("hello world");

Output

- console.log("hello");
+ console.log("hello world");

FAQ

Frequently asked questions

How are whitespace differences handled?

Diffs are shown per line and include spaces, tabs, and line breaks. Cleaning up stray whitespace before pasting makes the output easier to read.

Is it okay for large snippets?

Processing happens in the browser; a few thousand lines is typically fine. For bigger files, split them into sections before comparing.

Can I save the diff?

Use copy to grab the rendered diff text. You can also take a screenshot or rely on your browser’s save/share features if needed.

Use cases

Common use cases

Comparing config or environment changes
Quickly diff updated .env or YAML/JSON files to review tweaks and catch unintended edits.
Checking generated output
Paste build artifacts or codegen results to see exactly what changed between runs.
Sharing minimal edits
Extract only the relevant lines as a diff to discuss changes in PR comments or chat.

Notes

Notes & limitations

Work stays in your browser
Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.
Validate critical data
Results are helper outputs—double-check them before sending to production systems or sharing externally.
Large payloads depend on your device
Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.