What is the difference between side-by-side and unified view?

Side-by-side view places the original and modified text in two columns so you can scan changes in parallel, while unified view interleaves added and removed lines in a single column, similar to a Git diff.

Can I copy or download the comparison result?

Yes. After comparing, use the Copy button to put the diff on your clipboard or the Download button to save it as a file for sharing or archiving.

Text Compare & Diff Checker - Online Diff Tool for Code & Text

Compare two text files online and find the differences instantly. Diff code, config files, and plain text with side-by-side and unified views.

Paste two text blocks and this tool instantly highlights every difference line by line—marking added, removed, and modified lines in both side-by-side and unified diff views. It works for source code, config files, JSON, logs, and plain prose. All comparison runs locally in your browser, so your text never leaves your device.

Original Text

Modified Text

View Mode:

How to Use Text Compare & Diff Checker

Paste your original text in the left textarea

Paste your modified text in the right textarea

Click 'Compare Text' to see the differences highlighted

Switch between Side-by-Side and Unified views to analyze changes

Key Features

Line-by-Line Comparison

Efficiently compares text line by line to highlight insertions, deletions, and modifications

Dual View Modes

Choose between a side-by-side comparison or a unified diff view for flexibility

Privacy Focused

All comparisons happen locally in your browser - your text never leaves your device

FAQ

Is there a limit to text length?

The tool can handle large texts, but very large files might slow down your browser since processing is local.

Is my text secure?

Yes, absolutely. No data is sent to any server; everything is processed in your browser.

Can I compare code snippets?

Yes, this tool works great for code, configuration files, and any plain text content.

How to Use the Text Compare & Diff Checker

1
Paste your original text
Enter the original or baseline version into the left textarea—code, config, JSON, or plain text are all supported.
2
Paste your modified text
Enter the changed version into the right textarea so the two blocks can be aligned and compared.
3
Click "Compare Text"
The tool diffs the two inputs line by line and highlights every insertion, deletion, and modification.
4
Switch views to analyze
Toggle between Side-by-Side and Unified views, then copy or download the result to share or archive the diff.

References

Wikipedia — Diff
Overview of the diff utility and the line-by-line comparison algorithms that power text difference tools.
Wikipedia — Longest Common Subsequence
The classic algorithm most diff implementations use to find the minimal set of changes between two texts.

Related Tools

JSON Compare & Diff

Compare two JSON objects structurally and highlight key and value differences.

JSON Formatter

Beautify and validate JSON before diffing it for cleaner comparisons.

Markdown Viewer

Preview Markdown content rendered as formatted HTML.

CSV Viewer

Open and inspect CSV files in a readable table before comparing them.

Frequently Asked Questions

Is there a limit to text length?: The tool can handle large texts, but very large files might slow down your browser since processing is local.
Is my text secure?: Yes, absolutely. No data is sent to any server; everything is processed in your browser.
Can I compare code snippets?: Yes, this tool works great for code, configuration files, and any plain text content.
What is the difference between side-by-side and unified view?: Side-by-side view places the original and modified text in two columns so you can scan changes in parallel, while unified view interleaves added and removed lines in a single column, similar to a Git diff.
Can I copy or download the comparison result?: Yes. After comparing, use the Copy button to put the diff on your clipboard or the Download button to save it as a file for sharing or archiving.