Is this text diff free?

Yes. Completely free with no signup.

No. Diffing runs entirely in your browser.

This tool compares line by line — ideal for code and config files.

Can I use it commercially?

Yes. Free for personal and commercial use.

How are blank lines handled?

Blank lines are treated as individual lines in the comparison.

Text Diff

Next steps

Format changed JSON snippet

Paste two versions side by side to compare line-by-line — useful for configs, logs, code snippets, or doc edits. Green = added on the right, red = removed from the left, amber = same line changed.

Ignore whitespace

Left (original / before)

Right (updated / after)

AddedRemovedChangedEqual

Left (original / before)

Right (updated / after)

Enter text on both sides to see line-by-line diff

What is Text Diff?

Text Diff is an online tool that compares two text blocks line by line and highlights additions, removals, and changes. It helps developers quickly spot differences between code versions, config files, and documentation drafts.

Unlike heavyweight desktop diff tools, a browser-based line diff is instant and requires no installation. Paste two versions side by side and review the colored output immediately.

WaiHub's Text Diff runs entirely in your browser — sensitive source code and configuration never leave your device.

Line-by-line diff highlighting
Added, removed, changed stats
Side-by-side input panels
Color-coded legend
No installation required
Privacy-first browser processing

Features

Compare two text blocks
Line-by-line diff algorithm
Green/red/yellow highlighting
Diff statistics summary
Dual input textareas
Clear both sides at once
Monospace diff output
Works with code and configs
Runs locally in browser
No server upload

How To Use

Paste original text
Enter the baseline text in the left panel.
Paste comparison text
Enter the updated text in the right panel.
Review highlighted diff
Scroll the diff output to see added, removed, and changed lines.
Check statistics
Use the stats bar to see counts for each diff type.

Examples

Config change

Before

port=3000
host=localhost

After

port=8080
host=localhost

Code edit

Before

const x = 1

After

const x = 2

FAQ

Is this text diff free?: Yes. Completely free with no signup.
Is my data uploaded?: No. Diffing runs entirely in your browser.
Word-level diff?: This tool compares line by line — ideal for code and config files.
Can I use it commercially?: Yes. Free for personal and commercial use.
How are blank lines handled?: Blank lines are treated as individual lines in the comparison.