Line Compare – Compare Texts Line by Line
Paste two versions of a text and instantly see which lines were added, removed, or stayed the same. Perfect for comparing document drafts, code changes, configuration files, or any structured text. No signup, no uploads — everything stays private in your browser.
Why use this line compare tool?
When you need to understand what changed between two versions of a document, a line‑by‑line diff is the fastest way. Our tool highlights added lines in green, deleted lines in red with strikethrough, and unchanged lines in your normal text color. It's perfect for anyone who edits text, code, or configuration files.
- Fast visual diff – see all line changes at a glance with intuitive color coding.
- Trim whitespace option – ignore accidental space changes and focus on actual content differences.
- Case‑insensitive mode – treat "Hello" and "hello" as the same line for higher‑level comparison.
- Privacy first – all processing is done locally; your texts never leave your device.
How to compare lines (step‑by‑step)
1. Paste your texts
Place the original text in the left box and the new version in the right box. You can paste entire documents or small snippets.
2. Adjust options
Enable "Trim whitespace" to ignore leading/trailing spaces (on by default). Toggle "Case‑insensitive" if capitalization differences shouldn't count.
3. View the diff
The line‑by‑line diff appears instantly below. Added lines are green, deleted lines are red with strikethrough, and unchanged lines are neutral.
4. Copy or clear
Click "Copy diff text" to grab the diff as a unified format text with + for additions and - for deletions. Use "Clear all" to start fresh.
Example: a simple paragraph edit
| Original | Modified | Diff (visual) |
|---|---|---|
| The quick brown fox jumps over the lazy dog. That's a classic sentence. | The quick brown fox leaps over the lazy dog. It's a famous pangram. | The quick brown fox jumps over the lazy dog. leaps over the lazy dog. That's a classic sentence. It's a famous pangram. |
Common use cases
- Document revision: Compare a draft with a final version to ensure only desired changes were made.
- Code review: Check what lines were added, removed, or modified in a script or configuration file.
- Log analysis: Compare two log files to spot differences in entries.
- Data comparison: Verify that a transformed list of items matches expectations.
- Translation review: See how a translated text differs from the original line by line.
Pro tips
- If you're comparing files that were saved on different operating systems, trim whitespace first to normalize line endings.
- For a more granular view, use the Character Compare tool after identifying changed lines with this tool.
- The plain‑text copy uses unified diff format: lines starting with
+were added,-were deleted, and others are unchanged.