Free text compare and diff checker — paste two texts to highlight added, removed, and changed lines with unified or split views. No signup.
Also searched as: text diff · compare two texts · document comparison · online diff tool · text difference finder
Step-by-step guide to get the most from this tool
Enter original text in the left panel and modified text on the right.
Switch between unified and split diff views.
Enable if only trailing spaces differ.
Export the unified diff for tickets or version control.
What makes this tool stand out
Classic +/- line output with numbers.
Side-by-side removed vs added panels.
Skip trailing space differences.
One-click unified diff copy.
Added, removed, and unchanged counts.
No server upload.
More free utilities you might find useful
Quick answers to common questions
Paste your original text in the left box and the modified text in the right box. ToolReign instantly highlights added lines in green and removed lines in red — no signup required.
A text diff checker compares two pieces of text and shows exactly what changed — which lines were added, removed, or modified. Used by developers, writers, and editors to track changes between versions.
Yes. Copy and paste the content from both Word documents into the two text boxes and the diff checker will highlight all differences instantly.
Use a diff checker tool — paste both texts and it automatically finds and highlights every difference. ToolReign shows word-level and line-level differences.
Unified shows +/- lines in one panel. Split shows original (removed) and modified (added) side by side.
It trims trailing spaces on each line before comparing, ignoring insignificant whitespace differences.
The LCS algorithm finds optimal alignment, then marks each line as added, removed, or same.
Yes. Copy Diff exports unified format with + and - prefixes.
Yes. Paste source code in both panels — ideal for code reviews and config changes.
Yes. All comparison runs locally in your browser.
This tool compares plain text line-by-line. Use JSON Formatter for structured JSON diffs.
Your data is processed entirely in your browser. Nothing is sent to any server.