Text Diff Checker Online
Paste two versions of a text and see exactly what was added or removed — entirely in your browser.
Original text
Changed text
Never uploaded
Comparison happens entirely in your browser — neither text touches our servers.
Line or word mode
Compare whole lines for documents and code, or individual words for small edits.
Free, no limit
No account, and no limit on how much text you can compare.
What is a Text Diff Checker?
A text diff checker compares two versions of a piece of text and highlights exactly what changed — what was added, what was removed, and what stayed the same. It's useful for reviewing edits to a document, comparing two drafts, or spotting the difference between two similar blocks of code or configuration.
How to Compare Two Texts Online
- Paste your original text. Put the starting version in the left box.
- Paste the changed text. Put the newer or edited version in the right box.
- Choose a mode. "Compare by line" highlights whole lines; "Compare by word" highlights individual words.
- Click Compare. Additions appear highlighted in green, removals in red with a strikethrough.
Line Diff vs. Word Diff
Line mode treats each line as a unit — if even one character on a line changes, the whole line shows as removed-then-added. This is the standard way source code and structured documents are diffed. Word mode compares within a line, highlighting only the specific words that changed — better for catching a small edit in a sentence without the whole sentence being marked as different.
Frequently Asked Questions
How do I compare two pieces of text?
Paste the original text on the left and the changed version on the right, then click Compare — added and removed parts are highlighted immediately.
What's the difference between line and word diff mode?
Line mode highlights entire lines that were added, removed, or changed — good for comparing documents or code. Word mode highlights individual words within a line — good for spotting small edits in a sentence or paragraph.
How are additions and removals shown?
Added text is highlighted in green, removed text is highlighted in red with a strikethrough, and unchanged text is shown as plain text in between.
Can I see a summary of how many lines changed?
Yes — the number of added and removed lines (or words, in word mode) is shown above the comparison.
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser — neither piece of text is ever sent to CurePDF's servers.
Is the text diff checker free?
Yes, with no account required and no limit on how much text you can compare.
Does it work on mobile?
Yes, it works the same in a mobile browser as on desktop.
Can I copy the comparison result?
Yes — the Copy button copies a plain-text version of the diff, with + and - prefixes marking additions and removals.