Racira Developers

Clipboard API Tester

Test Clipboard API.

API: clipboard
Click the button to test the API.

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What is Clipboard Api Tester

The Clipboard API Tester writes a test string to the system clipboard using the modern Clipboard API (navigator.clipboard.writeText) and reports whether the operation succeeded. This verifies that the Clipboard API is available, that the page has the required clipboard-write permission, and that the browser environment permits clipboard access. The Clipboard API replaced the deprecated document.execCommand('copy') approach and requires a secure context (HTTPS) and a user gesture (like a button click) to function. The tool does not read from the clipboard — it only writes a fixed test string, making it safe to run in any environment.

How to Use Clipboard Api Tester

  1. Step 1: Navigate to the Clipboard API Tester page. A test button and output area are displayed.
  2. Step 2: Click the **Test API** button. The tool attempts to write the string 'Racira Developers test' to the system clipboard.
  3. Step 3: If the operation succeeds, the output confirms: 'Wrote Racira Developers test to clipboard'.
  4. Step 4: If the Clipboard API is unavailable (insecure context, permission denied, or unsupported browser), the output shows the specific error.
  5. Step 5: After testing, paste somewhere (Ctrl+V / Cmd+V) to verify the content was actually written.

Why Use Clipboard Api Tester

Clipboard operations are a common source of bugs in web applications because they depend on secure contexts, user gestures, and browser-specific permission policies. The Clipboard API Tester isolates the copy operation into a single click, letting developers quickly confirm that their environment supports the modern Clipboard API. This eliminates an entire category of debugging when 'copy to clipboard' features fail — the problem is often a missing HTTPS certificate or a restrictive Content Security Policy rather than application code.

Privacy & Security

This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.

Frequently Asked Questions

Why does it fail on localhost or file:// URLs?

<p>The Clipboard API requires a secure context, which means HTTPS or localhost (127.0.0.1). Pages served over plain HTTP or from file:// URLs are not secure contexts and cannot access the Clipboard API.</p>

Does this read from my clipboard?

<p>No. The tool only writes a fixed test string to the clipboard. It does not call navigator.clipboard.readText() or access any existing clipboard content.</p>

What is the difference between clipboard.writeText and the old execCommand approach?

<p>The modern Clipboard API uses a Promise-based interface that works in secure contexts without requiring a hidden input element or text selection. The deprecated document.execCommand('copy') approach required temporary DOM manipulation and had inconsistent behavior across browsers. The Clipboard API is cleaner, more reliable, and supports writing binary data (blobs) in addition to plain text.</p>

What browsers support the modern Clipboard API?

<p>Chrome 66+, Firefox 63+, Safari 13.1+, and Edge 79+ support the Clipboard API in secure contexts. Older browsers fall back to document.execCommand('copy'), which this tool does not use.</p>