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Text Diff Viewer

Text Diff Viewer supports side-by-side and unified comparison for text, code, and config files, making it useful for code review, proofreading, and configuration checks.

Original Text

Character

0 / 500,000

Modified Text

Character

0 / 500,000
Text Diff Viewer

Quick Start

1
Paste the original text on the left (code, documents, configs welcome)
2
Paste the modified text on the right
3
Click “Compare”; once computed, the results panel appears in the page
4
In the results panel, check the Summary at the top, then use the colors to locate added/removed lines
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Markers & line numbers: 🟢 Added (-:N) / 🔴 Removed (N:-) / Gray = context

Common Scenarios

Code review

verify the scope and impact of changes before committing, and use the diff as context for review comments

Document proofreading

compare revisions to spot added/removed paragraphs and wording changes

Config changes

diff environment or config files before and after edits to avoid accidental parameter removals

Log analysis

compare logs before and after an incident to pinpoint key differences

API responses

compare JSON/text responses across versions to confirm field and order changes

Merge conflicts

inspect both sides of a conflict manually to understand what should be kept or discarded

Release notes

use the diff as raw material to summarize changes for changelogs

Translation updates

check how source text changes impact translations to avoid missing updates

Comparison Parameters & View

Use the gear menu to toggle “Sync scroll” (side‑by‑side only); unified view is unaffected

Usage Advice

“Swap” flips both sides so it’s easier to inspect older revisions
For large edits, compare in sections to keep the diff readable
When whitespace and line breaks matter, first normalize them with the Text Formatter tool, then come back here to compare
Long texts may take a few seconds—watch the progress hint and give it time
“Clear” only clears the text and doesn’t affect settings; toggle “Sync scroll” from Settings (side‑by‑side)

Limitations & Compatibility

Line-based view: tiny character changes highlight the entire line
Whitespace counts—different indentation shows as changes
Different line endings (CRLF/LF) count as changes; normalize them first
Very long inputs take longer; if the browser slows down, split the diff
Mobile screens are cramped; desktop offers a fuller view

Privacy & Security

All processing happens locally in your browser. You can replace, clear, and re-run the current content at any time.

FAQ

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