What is side-by-side text comparison?

Side-by-side comparison displays two versions of a text in parallel columns. Changes are highlighted in both versions simultaneously so you can see exactly what was added, removed, or changed while reading context from both sides.

When is side-by-side view better than inline?

Side-by-side is better for longer documents where you want to see full context around each change. Inline view is better for short snippets where you want all changes in a single column.

Are the two panels synchronised when scrolling?

Yes. The side-by-side view synchronises scrolling between both panels so corresponding lines stay aligned as you scroll through the document.

Can I use this for legal or contract document comparison?

Yes. Side-by-side comparison is commonly used for contract redlining and legal document review to track clause changes between versions.

Is there a word-level diff within lines?

Yes. Within changed lines, the diff highlights the specific words or characters that changed, not just the whole line.

Can I print or export the diff?

You can use your browser's print function (Ctrl+P / Cmd+P) to print or save the diff view as a PDF for record-keeping.

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Side-by-Side Text Comparison Online

Side-by-side comparison is the clearest way to review differences between two versions of a text or document. FixTools displays both versions simultaneously with changes highlighted, so you can scan left and right to understand context and confirm every edit.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Both versions displayed simultaneously

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Changed lines aligned across both panels

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Colour-coded additions and deletions

Developer Tool

Diff Checker

All processing happens in your browser — your files are never uploaded to any server.

🚀Open Diff Checker

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How to use this tool

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Paste your two texts and choose the side-by-side view in Diff Checker for a parallel comparison where both versions are visible at once.

How It Works

Step-by-step guide to side-by-side text comparison online:

1
Open Diff Checker
Click "Open Diff Checker" to launch the tool.
2
Paste both texts
Enter your original text in the left panel and your updated text in the right panel.
3
Select side-by-side view
Choose the side-by-side view option to display both versions in parallel columns.
4
Compare and review
Click Compare. Scroll through both panels simultaneously to review changes with full context visible on each side.