Source Text
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Modified Text
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Compare Text Online - Free Text Diff Checker
Find the differences between two texts in seconds. Every addition, deletion, and change is highlighted line by line.
Need to compare two text files, check what changed between document versions, or see if two pieces of text are identical? Paste both versions and click compare. Everything runs in your browser, so your content never leaves your device. No account, no limits, free.
Privacy-first, nothing uploaded
Free with no limits
Instant results
What is a Text Comparison Tool?
A text comparison tool lets you compare two texts side by side and highlights exactly where they differ. Diff Guru is a free online text comparison tool built for anyone who needs to find differences between two documents, check changes in a file, or verify that two texts match. Paste both versions, hit compare, and every addition and deletion is shown in color, line by line.
Who Uses This Text Compare Tool?
People compare text online for a lot of different reasons. Here are the most common real-world cases.
Writers & Editors
Compare drafts of articles, blog posts, or books to see exactly what changed between revisions. Catch accidental deletions before they go to print.
Legal & Contracts
Compare contract versions, terms of service, or legal documents to see which clauses were added, removed, or quietly reworded between drafts.
Students & Academics
Check that feedback was applied correctly, or compare an essay draft against a revised version before final submission.
Developers
Compare config files, plain-text logs, README files, or environment files quickly, without the overhead of a code diff tool.
Business & HR
Compare policy documents, job descriptions, proposals, or meeting notes to track how a document changed from one version to the next.
Email & Communications
Review email drafts side by side before sending to make sure nothing important was accidentally cut or changed.
How to Compare Text Online
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Paste your original text
Copy your first version and paste it into the left panel. This could be a document, email draft, contract, or any plain text.
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Paste your modified text
Copy the updated or revised version and paste it into the right panel.
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Click Find Differences Instantly
Hit the button. Diff Guru processes both versions in your browser with no server upload.
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Review every change
Additions appear in green, deletions in red. Changes are organized line by line so nothing gets missed.
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Merge or copy your result
Use the merge arrows to accept specific changes, or copy the final version once you are done reviewing.
The entire comparison runs in your browser. No data is sent to any server, no account needed.
Why Use Diff Guru to Compare Text Online?
Completely Private
Your text never leaves your browser. Nothing is uploaded, stored, or logged. Fine for sensitive documents and confidential content.
No Limits, No Account
Compare text of any length, as often as you need. No sign-up, no rate limits, no paywalls. Every feature is free.
Instant Results
Comparisons run in milliseconds regardless of text size. No waiting, no loading screens.
Merge Changes
Use the merge arrows to accept specific changes from either version and build your final document.
Share Results
Generate a link to share the comparison with a colleague or client. No extra tools or accounts required.
Works on Any Device
Fully responsive. Works on desktop, tablet, and mobile without installing anything.
Need a More Specific Compare Tool?
This tool works for any plain text content. For code or specific file formats, try one of these dedicated tools with syntax highlighting.
Frequently Asked Questions
Paste your original text into the left panel and your updated version into the right panel, then click 'Find Differences Instantly'. Diff Guru highlights every addition, deletion, and change between the two versions. No account, no download, no payment needed.
Yes. Diff Guru is free with no usage caps. You can compare text as many times as you need, with documents of any length, at no cost. There are no hidden tiers or premium plans. Every feature is available to everyone.
Yes. Everything runs directly in your browser. Your text is never sent to our servers, stored, or logged. Sensitive documents, contracts, and personal content all stay on your device.
Yes. Diff Guru handles large inputs without issues. Long documents, contracts, article drafts, and email threads all compare in under a second. For very large files with tens of thousands of lines, speed depends on your browser and hardware, but typical documents are instant.
This tool is designed for prose, documents, contracts, emails, and any non-code content. It shows additions and deletions without syntax highlighting. If you need to compare code with proper syntax coloring, use one of our dedicated language tools like Python Diff, JavaScript Diff, or SQL Compare.
Yes. Copy the text from your Word document, PDF, or Google Doc and paste it into each panel. Diff Guru compares the raw text content and highlights every difference. For PDFs specifically, you can also use our PDF Compare tool which extracts text automatically from uploaded files.
Yes. Once differences are shown, merge arrows appear next to each change block. Click an arrow to accept a specific change and apply it from one version to the other. This lets you build a final merged version rather than just reading the diff.
Yes. After comparing, use the Share button to generate a shareable link. You can choose how long the link stays active: 1, 7, 15, or 30 days. The diff is stored on our servers only for that period and is permanently deleted once it expires.