What is a text diff checker?
A text diff checker compares two versions and highlights additions, removals, and changes so you can see what differs line by line and, where applicable, word by word.
Local only
PRIVATE ONLINE DIFF CHECKER
Compare Text Online Privately
Compare two texts online with line-by-line and word-level highlights. Compare text without sending it anywhere.
No uploads · No account · No tracking
Text comparison workspace
Diff
Comparison result
Add text above and press Compare to see the differences.
Add text above and press Compare to see the differences.
Workflow
How it works
Paste both versions
Paste the original text and the changed version into the two editors.
Choose comparison options
Choose whether case or surrounding whitespace should be ignored.
Review and export locally
Compare the versions, review line and word changes, then optionally copy the unified diff or download the local
.diffor.txtoutput.
Privacy boundary
Private by design
The text you compare is processed locally in your browser. Pasted Original and Changed text is not uploaded to a Private Text Compare backend.
Compared text, comparison results, option snapshots, and generated export content remain transient for the current page session and clear on refresh. Only the existing dark/light theme preference may persist locally.
Copy and download happen only after explicit user actions. Application clipboard access is write-only, and downloads are created locally from the generated output.
Common uses
Useful for quick before-and-after checks
- Writing and editing revisions
- Essays, reports, and notes
- Code and configuration snippets
- AI-generated rewrite comparisons
- Emails, policies, and other short business text
Reference
Frequently asked questions
Is my text uploaded or stored?
No. The compared Original and Changed text is processed locally in the browser, is not uploaded to a Private Text Compare backend, and clears when the page is refreshed.
Do I need an account?
No. The current tool works without an account or sign-in.
What does “Ignore case” do?
It treats case-only differences such as Hello and hello as unchanged when you compare.
What does “Ignore surrounding whitespace” do?
It ignores leading and trailing whitespace on each line. Whitespace inside the line remains meaningful.
Can I save or export my comparison?
You can copy the unified diff, download a local .diff file, or download a plain-text report. The site itself does not retain comparison history.
Can I compare files directly?
Not currently. Direct file import is not available, so paste the text you want to compare into the Original and Changed editors.
Guides