Text Compare / Diff Checker
Compare two texts: line- and word-level highlighting, side-by-side and unified views, ignore whitespace/case options, add/remove stats.
line1−line2+lineXline3+line4
What is Text Compare
Diff two texts with an LCS algorithm: added/removed/unchanged line stats, word-level highlighting inside changed lines, side-by-side and unified views, and ignore-whitespace/case toggles — all local.
How to use Text Compare
- Paste the original text on the left and the changed text on the right
- Optionally enable ignore-whitespace or ignore-case, then click Compare
- Switch between unified and side-by-side views to review changes
Frequently asked questions
What is the difference between line-level and word-level diff?
Line-level marks whole lines as added or removed; paired removed+added lines then get a word-level pass that highlights exactly which words changed — ideal for proofreading and code review.
Is my text uploaded anywhere?
No. The LCS diff runs entirely in your browser — nothing leaves your device, so sensitive text is safe to compare.
What does "ignore whitespace" ignore?
Before comparing, each line’s runs of whitespace collapse to a single space and edges are trimmed — indentation changes, double spaces and tabs stop showing up as edits.
Is Text Compare free?
Text Compare is completely free — open the page and use every feature with no hidden charges.
Do I need to download or install Text Compare?
No download or installation is needed. It is an online tool that runs in the browser on your phone, tablet and computer.
Do I need an account to use Text Compare?
No. Use the tool right away — no account or sign-in required.
Does Text Compare work on mobile?
Yes. The page is fully responsive and works on phones, tablets and desktop browsers.