See every difference
Paste two versions, drop two files or open them from a URL. DiffNex shows what was added, removed and changed – line by line and word by word – lets you merge changes with one click and exports an HTML report or a .diff patch.
Compare now — no sign-in needed
Type, paste or drop the two texts, keep up to 20 comparisons in this browser and share a read-only link with anyone.
From two versions to a clear answer in a second
Built for developers, writers, lawyers, translators and QA teams who check what changed between versions every day.
Changes down to the word
Lines are matched with an optimal diff (Myers' algorithm), then each changed line is compared word by word or character by character, so a changed number or comma is impossible to miss.
Merge with arrows
Copy a change from one side to the other with one click, swap sides and step through changes with ▲ ▼ or F7.
Ignore the noise
Ignore case, trailing spaces, any whitespace change or blank lines – and hide unchanged lines with expandable context.
Patches & reports
Download a unified .diff patch for Git or a self-contained HTML report you can print or send.
Cloud library
Save comparisons in folders with tags, full-text search, version history and a 30-day trash.
Share a read-only link
Send a link – the reader sees the same highlighted comparison and can switch views, but cannot edit.
Private by design
Tools run in your browser. Keycloak sign-in, private storage and PDPA export or erasure any time.
Three steps to the answer
Paste or open
Paste both texts, drop two files at once or open them from a URL.
Review the changes
Side by side, inline or patch – with word highlights, ignore rules and change navigation.
Merge, export, share
Copy changes across, download a report or patch, save to your Library or send a read-only link.
Rent DiffNex monthly or yearly
Start free. Upgrade when you need more space and power. Cancel any time.
Prices in Thai baht including 7% VAT. Tax invoices issued automatically.
Frequently asked questions
Do I need an account?
No. Text compare, file compare, code diff, word diff and the patch generator run entirely in your browser. Sign in to keep comparisons in your cloud Library, with history and versions.
How does billing work?
.
Can I change or cancel my plan?
.
Who can see a shared link?
Anyone with the link can read the comparison side by side, inline or as a patch – nobody can edit it. You can stop sharing at any time.
Which devices are supported?
All modern browsers on desktop, tablet and phone (installable as a PWA). Native iOS and Android apps are coming soon and sync with the same account.
Stop comparing text by eye
Find every change in seconds. Upgrade when you're ready.
Compare now – free