🔍

Text Diff Checker

Compare two texts and highlight differences line by line.

Original text

Changed text

About Text Diff Checker

Text Diff Checker is a free online tool. Compare two versions of text and highlight what was added or removed, line by line. It runs entirely in your browser, so there is nothing to install, no account to create and no watermark added to your result.

How to use Text Diff Checker

Type or paste your text into the input box.
Pick any options that appear, then run the tool or watch the live result.
Copy the output with the copy button.

Worked example

Comparing "Free online tools" with "Free online PDF tools" highlights the added word PDF.

Tips for best results

Paste the older version on the left so additions and removals read in the natural direction.
Everything runs in your browser, so you can use Text Diff Checker even on a slow connection once the page has loaded.

Limits to keep in mind

Results depend on the input you provide. Review the output before you use it somewhere important.

Frequently asked questions

Is there a text length limit?There is no fixed limit, but very large inputs depend on your device memory and may feel slower.

Is Text Diff Checker free?Yes. It is completely free with no signup, no watermark and no daily limit.

Do you store my files or text?No. Processing happens on your device in your browser, so your content is never uploaded to our servers.

Does it work on mobile?Yes. It works on current versions of Chrome, Safari, Firefox and Edge on phones, tablets and computers.

More free text tools

📝

Word Counter

Count words, sentences and reading time instantly.

🔠

Character Counter

Count characters with and without spaces.

🔤

Case Converter

Switch text between UPPER, lower, Title and Sentence case.

⬆️

Uppercase Converter

Convert any text to UPPERCASE instantly.

⬇️

Lowercase Converter

Convert any text to lowercase instantly.

Title Case Converter

Capitalize Every Word In Your Text.

Related guides

3 min

🥊

ChatGPT vs Claude vs Gemini: How to Compare Free AI Chatbots Yourself

Rankings go stale within weeks. Here is a repeatable five-task test, a scoring sheet and a plain-language look at what actually differs between the three chatbots.

3 min

🏆

Best Free AI Tools in 2026: How to Pick the Right Ones

A practical guide to choosing free AI tools by category, what to check on every free plan, and a sample stack you can adapt.

3 min

💬

Free ChatGPT Alternatives: What Each One Is Good At

A guide to the most popular free AI chatbots, what makes each one different, and how to choose one without wasting a week testing them all.

← Back to all tools · Free AI tools · Guides