How do I compare two texts online?

Paste original and changed text, or load local files, then pick line, word, or character mode.

What is the difference between text diff and text compare?

They describe the same job here: show what changed between two texts. This page is both a checker and a compare tool.

What is line-by-line text comparison?

Each line is a unit. A changed line is shown as removed and added, with word highlights inside the pair when the line was edited.

Word mode compares words. It is useful for prose when only a few words changed inside a sentence.

What is a character diff?

Character mode compares individual characters. Use it for short strings, IDs, and typos, not huge documents.

What is the difference between side-by-side and unified diff?

Side-by-side shows original and changed in two columns. Unified is a single column with − and + markers.

Can I compare code with a text diff tool?

Yes, as plain text. Beautify both sides first if formatting noise would hide the real edit.

Can I compare JSON with a text diff checker?

You can compare JSON as text. For keys and arrays, use the JSON Diff tool instead.

Can I ignore whitespace differences?

Yes. Turn on Ignore whitespace. Line endings are ignored by default because CRLF vs LF is common noise.

Can I ignore capitalization differences?

Yes. Ignore case treats Hello World and hello world as the same.

Can I compare text files?

Yes. Load local .txt and other text-like files in the browser. They are not uploaded.

Are my files uploaded?

No. File reading and comparison stay in this tab. Text is not written into the page URL.

Does the tool work offline after the page loads?

Yes for comparison, copy, and download, as long as the page and script remain available in the tab.

What happens when two texts are identical?

The result says no differences found, with 0 added, 0 removed, and 0 changed.

How large of a text can I compare?

Very large input falls back to line mode or is refused so the tab does not freeze. Compare a smaller section if you see that message.

Text Diff Checker & Text Compare Tool

Compare two texts online and instantly see added, removed, and changed content line by line, word by word, or character by character.

Compare two texts

Your text is compared in your browser and is not uploaded.

Paste or type two versions to compare them.

What Is a Text Diff Checker?

A text diff checker compares two versions of text and identifies content that was added, removed, or changed. Paste two drafts, load local text files, or drop a config snippet, then review the text comparison as a line diff, word diff, or character diff. The tool is a text diff engine: it finds an edit sequence, not meaning, JSON structure, or document layout. Use it when you need to compare two texts and see the exact differences.

How to Compare Two Texts Online

Paste the original text, or load a local text file.
Paste the changed text, or load the second file.
Choose line, word, or character comparison.
Review the result, then copy or download the differences.

How Does Text Diff Work?

The tool takes original text and changed text, finds an edit sequence, and labels pieces as added, removed, or unchanged. Line mode compares whole lines. Word mode compares words. Character mode compares characters. It does not understand intent. This page uses the diff library’s Myers-style comparison in your browser.

Line Diff vs Word Diff vs Character Diff

Mode	Best for
Line diff	Code, configuration, logs, JSON text, CSV, Markdown
Word diff	Prose, drafts, articles, contracts
Character diff	Short strings, identifiers, URLs, exact typos

Side-by-Side vs Unified Diff

Side-by-side keeps original on the left and changed on the right. Unified is a compact single column with − removed and + added lines. Inline is the same single-column review with labels. None of these is a Git repository; they are views of one comparison.

Text Diff Examples

Hello world. → Hello beautiful world. Word mode highlights “beautiful”.
return a + b; → return a + b + 1; Character or word mode isolates “+ 1”.
PORT=3000 → PORT=4000 shows 3000 vs 4000.
{ "status": "pending" } → { "status": "complete" } is raw text unless you use JSON Diff.
Draft: “We will ship Friday.” → “We will ship Monday morning.” Word mode isolates the date change.

What Can You Compare With a Text Diff Checker?

Code. Compare two snippets after a refactor.
Writing. Compare drafts and edited copy.
Configuration. Spot a port, flag, or path change.
API responses. Compare plain-text JSON or XML as text.
Policies. Review wording revisions. This is not legal advice.
URLs and logs. Find a character-level typo or a changed line.

Common Text Comparison Mistakes

Comparing pretty-printed text with minified text and thinking the whole file changed.
Missing CRLF vs LF noise — turn on ignore line endings.
Using character mode on a huge document.
Expecting a text diff to parse JSON structure. compare JSON structurally instead.
Leaving original and changed swapped.

If spacing is the only problem, remove extra spaces first, or format JSON before comparing.

Text Diff vs. Text Similarity

A text diff answers “what changed?” Similarity would answer “how alike are these texts?” This page does not compute a similarity score.

Text Diff vs. JSON Diff

Text diff compares raw characters and lines. JSON Diff compares objects and arrays. After you format JSON before comparing, you can still use this page as plain text, but structure belongs on JSON Diff.

Text Diff vs. Git Diff

This tool is for a quick browser comparison. Git diff is for version-controlled projects, history, and patches. The download here is a readable unified-style text file, not a claim that git apply will accept it.

Frequently Asked Questions

What is a text diff checker?: It compares two versions of text and marks added, removed, and changed content. This page does that in your browser.
How do I compare two texts online?: Paste original and changed text, or load local files, then pick line, word, or character mode.
What is the difference between text diff and text compare?: They describe the same job here: show what changed between two texts. This page is both a checker and a compare tool.
What is line-by-line text comparison?: Each line is a unit. A changed line is shown as removed and added, with word highlights inside the pair when the line was edited.
What is a word diff?: Word mode compares words. It is useful for prose when only a few words changed inside a sentence.
What is a character diff?: Character mode compares individual characters. Use it for short strings, IDs, and typos, not huge documents.
What is the difference between side-by-side and unified diff?: Side-by-side shows original and changed in two columns. Unified is a single column with − and + markers.
Can I compare code with a text diff tool?: Yes, as plain text. Beautify both sides first if formatting noise would hide the real edit.
Can I compare JSON with a text diff checker?: You can compare JSON as text. For keys and arrays, use the JSON Diff tool instead.
Can I ignore whitespace differences?: Yes. Turn on Ignore whitespace. Line endings are ignored by default because CRLF vs LF is common noise.
Can I ignore capitalization differences?: Yes. Ignore case treats Hello World and hello world as the same.
Can I compare text files?: Yes. Load local .txt and other text-like files in the browser. They are not uploaded.
Are my files uploaded?: No. File reading and comparison stay in this tab. Text is not written into the page URL.
Does the tool work offline after the page loads?: Yes for comparison, copy, and download, as long as the page and script remain available in the tab.
What happens when two texts are identical?: The result says no differences found, with 0 added, 0 removed, and 0 changed.
How large of a text can I compare?: Very large input falls back to line mode or is refused so the tab does not freeze. Compare a smaller section if you see that message.

Last editorial review: 2026-10-03.