Free browser diagnostics from ContextPaste

Browser Clipboard Inspector

Diagnose what a website receives when you paste or drop.

Inspect plain text, styled content, images and source URLs, files, app-specific formats, and browser evidence. Everything is processed locally in this page.

Want paste preflight across Mac apps? Join the ContextPaste beta → Learn how one copy becomes different pastes →

Paste into the inspector

Clipboard contents are processed locally and are not uploaded.

Paste anywhere on this pageThis is an editable text box, so the text cursor is expected. Right-click here for Paste or Paste and Match Style. You can also press ⌘V or ⇧⌘V, or drag'n'drop content anywhere on the page.

Compare with the Clipboard API

Runs a separate browser snapshot. It may normalize or return different types than a paste event, and the browser may ask permission.

Starts a separate Clipboard API read after this click only.
Copies plain text, styled content, and ContextPaste metadata.
Waiting for a pastePaste anywhere above, or compare with a separate Clipboard API snapshot.

Capability preview

This is a lightweight product sketch while the final screenshots, motion, and interaction treatment are still being decided.

The browser receives more than the visible paste.

One clipboard item can expose several representations. The destination decides which one it can use; this inspector keeps the browser-visible versions separate so you can compare them.

What can I inspect?

Plain text, styled content, images and source URLs, files, app-specific web formats, and the event values reported by the browser.

Why can paste and drop produce different results?

Paste and drag-and-drop reach the page through different browser events. Each route can expose a different type list, file list, or payload.

Does ContextPaste upload my clipboard?

No. The browser-visible content is inspected locally in this page. Clearing or refreshing removes the current capture.

Can this show every native Mac pasteboard format?

No. Browsers restrict what pages can read. The planned Mac app can inspect native pasteboard representations that a web page cannot access.

Three levels of paste access

The browser exposes a subset. The Mac inspector sees the native pasteboard. ContextPaste adds rules and transforms.

Available on this page

Clipboard Inspector

Inspect the representations this browser exposes.

Planned · Mac app

ContextPaste Inspector

Inspect the native macOS pasteboard before pasting.

Planned · Pro

ContextPaste Pro

Apply source-, destination-, and content-aware rules.

Join the Pro waitlist

Join the ContextPaste Pro waitlist

Get updates about native inspection, confirmations, formatting rules, and paste automation on Mac.

No clipboard content is sent.