Free, up to 4 MB per shared version

Run HTML prototypes in your browser

Drop in a folder, a zip or one file and it runs in the tab. Site Runner keeps each upload as a version and shares the one you pick as a link.

Site Runner’s version list and preview

Pick a site, then a version. It runs on the right from your browser’s own storage, with its styles, scripts and links working as they would on a server. Read the limits

From a zip to a link in 3 steps

  1. Drop the site’s files in

    Drag a folder, a zip or a single HTML file onto the page. It unzips in the tab and nothing is uploaded.

    6 files ready
    • index.htmlHTML
    • styles.cssCSS
    • app.jsJavaScript
    • logo.svgSVG
    • ridge.jpgImage
    • route.jsonJSON
  2. Check the site in the preview

    Your files are served from browser storage, so relative links, images and scripts load as they would online.

  3. Share one version of the site

    Share uploads that one version and gives you two links: one that follows the live version and one pinned to it.

Site versions you can publish and undo. Links stay put.

Keeps every site upload as a version

Drop a new build on a site and it becomes the next version, with a note on what changed.

  • Version 9 savedTaller elevation chart, 14 files
  • Version 8 is liveWater stops added
  • Version 7 savedFixed the mobile menu

Pins a share link to one version

Add @3 to a share link and it always opens version 3, even after you publish version 4.

Rolls the site back with Make live

Point the live link at any earlier version in one click. Visitors get it on their next page load.

Runs shared sites in a sandbox

A shared page gets no origin of its own, so its scripts cannot read your edit token or cookies.

Questions

About files, limits and who can publish.

Email a question

Does my site leave my computer?

Not until you press Share. Before that they stay in your browser’s storage, and the preview runs from there.

How big can a shared site be?

Up to 4 MB zipped, 50 MB unzipped and 2,000 files. Local previews are limited only by your browser’s storage.

Who can publish to my shared site?

Whoever holds its edit token. Site Runner creates it on the first share and keeps it in your browser; there are no accounts.

What if I clear my browser data?

Local sites and their versions go with it. Shared versions stay online, but you lose the token that publishes new ones.