Text Diff Checker
Paste an original and revised text to see line-by-line additions and removals side by side in a clear change list.
Compares whole lines and marks additions and removals. Text stays in this browser. Each input is limited to 800 lines.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Paste the original text.
- Paste the changed version.
- Select Compare text to review added and removed lines.
Good to know: Comparison is line-based rather than semantic, and each input is limited to 800 lines to keep processing responsive. Text is not uploaded or saved.
Privacy and processing
Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
Which count should I use for a social media limit?
Use the destination platform's own count because its rules for links, emoji and special characters may differ.
Does character count include spaces?
The counter shows counts with and without spaces so you can match the rule you need.
What does Text Diff Checker do?
Compare two text versions and highlight added or removed lines. Paste an original and revised text to see line-by-line additions and removals side by side in a clear change list.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.
What should I know before using this tool?
Comparison is line-based rather than semantic, and each input is limited to 800 lines to keep processing responsive. Text is not uploaded or saved.