What is a bookmarklet?

A bookmarklet is a small JavaScript program stored as a bookmark in your web browser. When clicked, it executes JavaScript code on the current webpage, allowing you to modify content, extract data, or enhance functionality without installing browser extensions.

Are bookmarklets safe to use?

A bookmarklet is JavaScript running against the current page, so no source label alone makes it safe. Decode and read the complete source, identify network destinations and private page data, test DOM behavior away from real accounts, and do not run code you cannot explain.

How do I install a bookmarklet?

To install a bookmarklet, simply drag the bookmarklet link to your browser's bookmarks bar. Alternatively, you can right-click your bookmarks bar, select "Add bookmark," and paste the JavaScript code as the URL. The bookmarklet will then appear as a clickable button in your bookmarks.

Do bookmarklets work on mobile browsers?

Bookmarklet support varies on mobile browsers. Some mobile browsers like Safari on iOS support bookmarklets, but installation requires manual URL editing. Chrome and Firefox on Android have limited support. For best results, use bookmarklets on desktop browsers.

What's the difference between bookmarklets and browser extensions?

Bookmarklets are lightweight, single-purpose JavaScript snippets that run when clicked, require no installation process, and work across different browsers. Browser extensions are more powerful, can run automatically, have access to more browser APIs, but require installation and are browser-specific.

Free Bookmarklet Maker & Generator

Create bookmarklets from readable JavaScript, decode existing URLs, inspect capabilities without execution, and test DOM changes in an isolated local fixture.

JavaScript Bookmarklet Converter

Convert JavaScript into an encoded bookmarklet URL, or decode an existing bookmarklet so you can inspect its code before installing it.

Quick Start Presets

JavaScript Code

Wrap in IIFEMinify (no mangling)

Code stays in your browser. Minification is loaded only when you use the converter.

Generated Bookmarklet URL

How to Create a Bookmarklet

Turn a JavaScript snippet into a browser tool in three steps.

1. Paste JavaScript
Enter your code or load a preset. Your code stays in your browser.
2. Convert and Review
Wrap and minify the code, then review the readable source and generated URL.
3. Save to Your Browser
Copy the URL into a bookmark or drag the install button to the bookmarks bar.