The text and data corner

Compare two texts

Two versions of a contract, a quote, a letter: comparing them on an unknown site means handing that site both versions. Here they never leave your device, and the tool shows the change WORD BY WORD, not two whole lines painted red.

Two pasted texts

The original versionPaste the FIRST version here. After the click, a second box will appear for the modified version. Neither text is sent anywhere.

Ctrl + Enter also runs the tool.

This file is beyond what this tool does

This tool needs JavaScript to work, and that is precisely because it works ON YOUR DEVICE: without JavaScript, your text would have to be sent to a server. The instructions and the limits of the tool, however, can be read without JavaScript, just below.

How this is built

Your text never leaves your device

This tool works entirely inside your browser. What you type or paste here is sent nowhere, and nothing is kept once the tab is closed.

Checkable in ten seconds, without taking our word for it:

Open your browser's inspector: the F12 key (or Ctrl+Shift+I, or Cmd+Option+I on a Mac).
Go to the “Network” tab, then clear the list.
Type or paste some text on this page and run the tool. The list stays empty: no request goes out.
To go further: cut your connection and do it again. The tool still works.

This absence of requests is also checked BY MACHINE before every release: a lock drives a real browser, processes a real file, and refuses to publish if a single byte goes out.

The proof page, step by step and in pictures

Going further

InstructionsHow it works

Plain text, in both boxes. The comparison runs line by line: a text that is one single paragraph is therefore compared as one block. Break your paragraphs with line breaks for a readable result.

VerifyThe proof, step by step

The network inspector check, explained one gesture at a time, with screenshots.

The cornerThe text and data corner

The other tools in this corner of the workshop.

UnderstandHow this is built

The formats actually handled, browser by browser, and what we ruled out.