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How do I use this?

Go to https://983.github.io/bookmarklet.htm and follow the instructions.

Alternatively, create a bookmark with this content. The bookmark should point to javascript:..., not to https://...bookmarklet.js.

How does this work on a technical level?

Instead of regular links like https://..., you can create links like

javascript:alert('Hello, World!')

to execute arbitrary javascript code in the context of the current website. You can even bookmark those links, which are then called a "bookmarklet".

Clicking on the bookmarklet while on a random website will activate it. This bookmarklet then scans the website for all <img> and <a> tags and tries to download their img.src or a.href attribute into an Uint8Array via XMLHttpRequest. The downloaded data is then written into an uncompressed ZIP archive.

For information about the structure of a ZIP file, see this documentation Backup link.

TODO

  • Handle cross origin requests.
  • Support for more file types, maybe videos? (.mp4, .webm, .m3u8)
  • Support infinite scroll somehow. Likely impossible to do in a general way, but can work for specific sites.
    • Imgur: Parse https://imgur.com/ajaxalbums/getimages/<albumid>/hit.json