Free Online Text Diff Checker
Use this free Text Diff Checker to compare two pieces of text, code, JSON, logs, configuration files, or document drafts. Paste the original version on the left and the changed version on the right to instantly see what was added, removed, changed, or unchanged.
The tool is designed for practical daily work: reviewing code snippets, comparing API responses, checking content edits, finding config changes, debugging logs, and confirming exactly what changed before sharing or deploying something.
Everything runs directly in your browser with no account required. Your text stays local while the page gives you a clean side-by-side comparison, summary counts, copyable diff output, and options to ignore whitespace or case when needed.
Key Features
When to Use This Text Diff Checker
How to Use the Text Diff Checker
- 1. Paste the original text, code, JSON, or document content into the left input.
- 2. Paste the changed version into the right input.
- 3. Review the summary cards to see how many lines were added, removed, changed, or unchanged.
- 4. Use ignore whitespace or ignore case when formatting differences are not important.
- 5. Copy the unified diff output when you need to share the comparison with another developer or teammate.
Text Diff Checker FAQ
What is a text diff checker?
A text diff checker compares two text inputs and highlights what changed between them. It is useful for reviewing code, documents, logs, JSON responses, configuration files, and content edits.
Can I compare code with this tool?
Yes. You can paste code snippets, configuration files, JSON, SQL, Markdown, or plain text. The tool compares line by line and shows additions, removals, changed lines, and unchanged lines.
Does this diff checker upload my text?
No. The comparison runs in your browser and does not require login. Avoid pasting sensitive production secrets into any online tool unless you understand the risk.
What does ignore whitespace do?
Ignore whitespace compares lines after removing spacing differences. This helps when formatting changed but the meaningful text or code stayed the same.
Can I copy the diff result?
Yes. The tool creates a readable unified diff output that you can copy and share in tickets, pull requests, chats, or debugging notes.