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An original and a revised text.
Writing table
Text difference checker
Review revisions privately without creating an account or shared document.
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What does text difference checker do?
The text diff compares two strings by words or by lines and highlights unchanged, removed, and added segments. It reports addition and removal counts and can copy a simple prefixed change listing.
- Input
- An original and a revised text.
- Result
- A readable line comparison.
- Price
- Free
- Account
- Not required
How to use text difference checker
Choose your settings
Review revisions privately without creating an account or shared document.
Save or copy
A readable line comparison.
A practical tip
Normalize whitespace first when formatting changes are hiding the meaningful edits.
When to use text difference checker
Review wording changes between two versions of release notes.
Compare a generated configuration with a previous copy one line at a time.
Spot a changed date, price, or clause in two short text excerpts.
Worked example
A concrete text difference checker example
- Input
- Before: The launch is Friday. After: The launch is Monday.
- Settings
- Word comparison
- Result
- “Friday” is removed and “Monday” is added; the period and the other three words are unchanged.
What to expect
How it works
Both inputs are tokenized as whitespace-aware words or as complete lines. A longest-common-subsequence calculation aligns matching tokens, after which unmatched tokens are marked as removals or additions. Comparison is exact, including case and whitespace.
Know before using
Limits and edge cases
- The comparison is refused when the token matrix would exceed 2,000,000 cells, so very long or heavily line-broken documents may need a dedicated diff program.
- Moved text is represented as a removal plus an addition, and the copied listing is not a standard unified-diff patch.
Common questions
Text difference checker FAQ
Is text difference checker free to use?
Yes. Text difference checker is free to use.
Does text difference checker keep my work private?
Yes. Your work stays private while you use the tool — nothing you enter is uploaded.
Is the comparison case-sensitive?
Yes. For example, “Draft” and “draft” are treated as different tokens and appear as a removal and an addition.
When should I choose line mode instead of word mode?
Use line mode for lists, logs, or configuration where a whole row is the meaningful unit. Use word mode for prose and small wording edits.