Local Text Diff Checker
100% Secure — No Uploads
Compare contracts, source code, or any two texts side-by-side with line and character-level highlights — all computed locally in your browser.
▶ Open Tool NowHow to Use — Step by Step
📋 Paste Your Documents
Paste your original text into the Original textarea and the updated version into the Modified textarea. You can compare contracts, code files, manuscript drafts, or any plain text.
⚙️ Choose a Diff Mode
Line-by-line Diff — best for detecting added or removed entire sentences in paragraphs or structured lists.
Character Diff — perfect for catching microscopic spelling corrections, shifted decimal points, or minor punctuation changes within lines.
🔍 Run the Comparison
Click Compare. The LCS (Longest Common Subsequence) algorithm runs entirely in your browser's local memory — no text is transmitted over the network at any point.
🎨 Read the Highlighted Results
Differences appear color-coded in the output panel:
Red = text deleted from the original
Green = text newly added in the modified version.
Scan through the diff quickly to identify all changes at a glance.
✅ Confirm & Act on Changes
Review each highlighted segment for accuracy. Use the results to approve contract revisions, audit code changes, or verify editorial edits — with full confidence that your sensitive content never left your device.
💡 Tips & FAQ
- Is my text sent to a server? Never. EasySolve computes the diff matrix (LCS algorithm) purely inside your browser sandbox. Works even offline.
- Which mode is better for code? Use Character Diff for single-line code changes and Line Diff for comparing whole functions or blocks.
- Can I compare confidential NDAs or contracts? Yes — this is one of the safest ways to diff sensitive documents, since nothing leaves your machine.
- What about very large documents? For texts over ~100,000 characters, processing time may increase slightly. The tool handles most documents near-instantly.