Free tools
Diff checker
Paste two versions of a text to see what changed. The diff marks removed and added lines, and the changed words inside each line.
- Runs in your browser
- No account
- Get a link when you want one
Get a link
Publish this page to a Display URL that you can send to anyone.
- Anyone with the link can open it for 30 days. Search engines do not index it.
- You also get a claim link. Open it and sign in to keep the page and choose who can open it.
Nothing leaves your browser until you select Get a link. Do not publish passwords, keys or personal data.
How to use the Diff checker
- Paste the first version into Original and the new version into Changed. You can also drop a text file on each box. To see how the tool works, select Load an example.
- Read the changes below the boxes. The diff marks removed lines in red and added lines in green. In a changed line, the tool marks the words that changed.
- Select Lines to see only the changed lines, without word marks.
- To send the changes to someone for review, select Get a link. Display publishes the diff as a page.
Limits
- The tool compares up to 5 MB of text in each box.
- The tool compares the text line by line. It does not read Markdown or HTML formatting, so a changed tag shows as changed text.
- When the two texts have more than 2,000 changed lines, the tool shows the changed part as one block. A note on the page tells you this.
- The tool does not ignore white space. A changed indent shows as a change.
- Get a link publishes the diff, not the two files. Anyone with the URL can open it for 30 days. Search engines do not index it.
Diff checker questions
Does the diff checker send my text to Display?
No. The tool compares the texts in your browser. Display receives the diff page only when you select Get a link.
Which files can I compare?
Any plain-text file, such as .txt, .md, .html, .json, .csv or source code. The tool does not read Word or PDF files.
How does the tool find changed words?
The tool pairs each removed line with the added line in the same place. When most of the line stayed the same, it marks the words that changed.
How long does the link work?
30 days. Open the claim link and sign in to keep the page in your Display organization. After you claim it, you can make it open only for people at your company.
Let your agent publish the next one
Connect Cursor, Codex, Claude Code or any other agent. It publishes HTML and Markdown to a URL, and you choose who can open it.
Claude
Cursor
Codex