Online Text Difference Checker
Compare two texts or text files online, including HTML, CSS, JSON, CSV, YAML, JavaScript, and TypeScript, then review added and removed lines locally in your browser.
Online Text Comparison Tool
Use this free text difference checker to compare documents, HTML, CSS, code, configuration files, JSON, CSV, YAML, and other readable text. Differences are highlighted line by line without sending your content to a server.
How to Use the Text Difference Checker
Add the original text
Paste the first version into the left panel or choose a local text file.
Add the changed text
Paste the second version into the right panel or choose another local file.
Review highlighted lines
Added lines appear in green, removed lines in red, and matching lines remain unchanged.
Clear and compare again
Use Clear all to remove both inputs and start a new text comparison.
What Is a Text Difference Tool?
A text difference tool, also called a text comparison or diff checker, compares two versions of text and shows what was added or removed. It is useful for reviewing document edits, code changes, configuration updates, and file revisions.
How Does Online Text Comparison Work?
The checker splits each input into lines and matches equal lines in sequence. Inserted lines are shown as additions, deleted lines as removals, and shared lines as unchanged content so you can review changes quickly.
Which Text Files Can Be Compared?
You can compare TXT, Markdown, CSV, YAML, JSON, XML, HTML, CSS, JavaScript, TypeScript, Vue, SQL, logs, configuration files, and other files that contain readable text. The tool checks file content instead of relying only on an extension, so text files with uncommon extensions can also work.
Are My Files Uploaded?
No. Choosing a file gives the browser temporary access to read its contents. The comparison runs locally, and the text is not sent to or stored on the comparison server.
Text Difference FAQ
What is the difference between text comparison and text difference?
Text comparison is the process of checking two versions. Text difference is the result that shows which lines were added, removed, or left unchanged.
Can I compare two text files?
Yes. Choose a readable text file in either panel. TXT, JSON, YAML, CSV, JavaScript, TypeScript, Markdown, and many other text files are supported.
Can I compare code files?
Yes. You can compare source code such as JavaScript, TypeScript, HTML, CSS, Vue, Python, Java, SQL, and other code saved as text.
Does the tool upload my files?
No. Files are read and compared in your browser. They are not uploaded to a server.
Can I compare CSV, JSON, and YAML files?
Yes. These formats are plain text, so the tool compares their original lines and preserves commas, quotes, indentation, and line breaks.
Why was my file rejected?
The file may contain binary data or use an encoding that the browser cannot decode as supported text. Try exporting it as UTF-8 plain text.