🔍 Text Diff Checker

Free online text diff checker

This text diff checker compares two pieces of text and shows exactly what changed. Paste the original text in the left box and the changed text in the right box, then click Compare. Words that were added are highlighted in green, and words that were removed are shown in red with a line through them. It is a fast way to review edits without reading both versions line by line.

How to compare two texts

1. Paste the older or original version into the left box.
2. Paste the newer or edited version into the right box.
3. Click Compare.
4. Read the result: unchanged words appear normally, additions are green, and deletions are red and crossed out.

What you can use it for

• Editing and proofreading: see what an editor or teammate changed in your draft.
• Contracts and policies: spot small wording changes between two versions of a document.
• Students and writers: compare drafts of an essay or article.
• Notes and code snippets: check what differs between two copies of a short text or configuration.
• Plagiarism and duplicates: see how much two similar texts overlap.

How the comparison works

The tool compares the two texts word by word, finds the longest run of words they share, and marks everything outside that run as added or removed. Spaces and line breaks are compared as well, so a change in spacing may also show up as a difference. For the cleanest result, remove extra blank lines and trailing spaces from both versions first.

Tips for better results

• Compare similar versions of the same text. Two completely different texts will simply show everything as changed.
• The comparison is case sensitive, so "Word" and "word" count as different.
• For very long documents, compare one section at a time.
• For code projects, a version control tool such as Git is a better fit for tracking changes over time.

Frequently asked questions

Is there a limit on text length?

Very long texts can slow down your browser, so there is a safety limit. If your texts are too long, you will see a message asking you to compare shorter passages.

Does it compare by word or by line?

By word, which makes small edits inside a sentence easy to see.

Why do changes in spacing appear?

Spaces and line breaks are treated as part of the text. If you only care about the words, tidy the spacing before you compare.

Is my text private?

Yes. The comparison runs in your browser and your text is never uploaded or stored.