Compare two blocks of text and see what changed, line by line.
About this tool
Paste an original and a changed version of any text to see exactly which lines were added or removed. Everything runs in your browser — nothing you paste is uploaded or stored.
Runs in your browser — nothing is uploaded; your input never leaves your device. How it works
Quick answer
Paste the original text in one box and the changed version in the other — Tabreon highlights added and removed lines instantly, entirely in your browser.
Why use Tabreon for this?
The comparison runs entirely in your browser as you type — neither text is uploaded or stored.
Added and removed lines are color-coded so changes are obvious at a glance.
Copy the result as a unified diff (with +/- prefixes) for pasting into a code review or ticket.
How to compare two texts
1Paste the original text. Enter the starting version into the "Original" box.
2Paste the changed text. Enter the updated version into the "Changed" box.
3Review the highlighted diff. Added lines appear in green, removed lines in red, updating live as you edit either box.
What is a diff checker?
A diff checker compares two versions of a text and shows which lines were added, removed, or left unchanged — the same idea behind "track changes" in a word processor or a code diff in Git, but for any plain text: articles, config files, contracts, or emails.
How Tabreon handles your data
The comparison runs in your browser using a line-based diff algorithm — neither text is uploaded or stored, which matters since a diff often involves an unpublished draft or an unreleased document.
Key features
Line-by-line comparison with added/removed line counts
Color-coded diff view — green for additions, red for removals
Copy the diff as unified +/- text with one click
Updates live as you edit either input
Common use cases
Checking what changed between two drafts of an article or email
Comparing two versions of a config file or a script
Spotting the exact wording change between two contract revisions
Common mistakes & limitations
Comparison is line-by-line, not word-by-word — a single-character edit on a long line marks the whole line as changed.
Extremely large pastes (over 50,000 lines) are skipped to avoid freezing the tab; compare a smaller section instead.
Frequently asked questions
No. Both texts stay in your browser tab and are compared locally — nothing is sent to a server or stored.
Line-by-line. If you need to see exactly which words changed within a line, look at the two full lines side by side in the diff view.
Yes — the "Copy diff" button copies a unified diff (lines prefixed with + for additions and - for removals) that you can paste anywhere.