Bookmarklet Builder

Paste any JavaScript, pick a name, and get a javascript: URL you can drag to your bookmarks bar. Live length meter, four built-in helpers ($, $$, qs, DOMContentLoaded), a conservative minifier, and a sandboxed "Run in iframe" test runner. Pure client-side, no upload.

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Minify is conservative: it skips content inside string literals and common regex literals. Turn it off if your script uses template literals with embedded expressions.
Inject helper:

Your bookmarklet
My Bookmarklet What it does (one line).
Length — chars
Show the raw javascript: URL 
 
 
  
 How to use it 
     
  1. Type or paste your JavaScript in the editor above.
    2.  
  2. Set a name and an optional one-line description.
    3.  
  3. If you want a shorter URL, tick "Minify".
    4.  
  4. 
Drag the Your bookmarklet link straight to your
        browser's bookmarks bar. Or click Copy link HTML and
        paste it into a page.

    5.  
  5. 
Click the saved bookmark on any page to run the script in that
        page's context.

    6.  
 

The URL meter turns orange over 2,000 characters and red over
      8,000 — most browsers tolerate up to about 32,000 but start to
      behave inconsistently above that.