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The Assets tab on each site is a small file store for the media your experiments need. Hero images for a variant, a downloadable PDF for a lead magnet, product shots. Everything you upload gets an immutable URL you can hard-code into variant JS or CSS.
Assets tab

Assets tab, upload, storage meter, per-file rows.

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What is accepted

  • Images, JPEG, PNG, GIF, WebP.
  • PDFs.
Nothing else. If your variant needs a video, host it somewhere that does streaming properly and reference the URL, ABTestly is not a video CDN.

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Per-file cap and per-plan budget

Per file:
  • Images: up to 5 MB.
  • PDFs: up to 20 MB.
Per site, the storage budget depends on your plan:
  • Free: 0 (upload disabled).
  • Starter: 1 GB.
  • Pro: 5 GB.
  • Business: 20 GB.
  • Enterprise: 100 GB.
The Assets tab shows the meter at the top. The budget includes soft-deleted files, see Recycle bin for how to actually free storage.

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Upload

Drag onto the tab or click Upload. Runs with a real progress bar so you know it is doing something. On upload the file is:
  1. Sniffed for its real type (extension is not trusted).
  2. Hashed with SHA-256.
  3. Deduplicated by content hash within the site. If the same content already exists, the existing URL is returned and no new storage is used.

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The URL you get back

Every file gets an immutable, canonical URL:
  • <namespace>, a per-site 32-character hex string, isolated from other sites.
  • <hash>, the content hash. A change to content produces a new hash and therefore a new URL.
  • <filename>, canonical filename. A request with the wrong filename returns a 308 redirect to the canonical one.
Served with Cache-Control: public, max-age=31536000, immutable. Browsers and CDNs cache forever, because it truly is forever, content is content-addressed, so a change means a new URL.

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Where the URL is safe

  • Variant JS, hard-code the URL.
  • Variant CSS, background-image: url(https://usercontent.abtestly.com/...).
  • PDFs, reference in a download link.
  • Emails, public and immutable, safe to send as an image reference.

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Dependents lookup

Click a file to see which variants reference it. Substring match on the URL across every variant’s JS and CSS on the site, accurate enough that you can safely delete a file that shows zero dependents.

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Serving

Access-Control-Allow-Origin: *, so images work inline anywhere. Full URL-shape, cache, and takedown detail on Serving.