> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hypastack.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Secure File Sharing

> Zero-knowledge file sharing with expiring or burn-on-read links.

Secure File Sharing is Hypastack's zero-knowledge pipeline for sending files privately. It's the right choice for anything sensitive: documents, private media, backups.

## Uploading

Drag a file into the dashboard, or use the [Developer API](/api-reference/overview) if you're building this into your own app. The file is encrypted in your browser before it's sent, see [How Encryption Works](/how-encryption-works) for the details.

## Expiration and burn-on-read

Every file has a lifetime after which it deletes itself automatically. You can also mark a file **burn on read**, which deletes it shortly after its first download, useful for one-time secrets.

<Note>
  How long a link can live for depends on your plan. Paid plans get a longer expiration window (a multiplier on the base window). See [Pricing & Plans](/pricing).
</Note>

## Sharing the link

The share link contains the decryption key in its URL fragment (`#...`). Send the whole link to whoever needs the file. Because the fragment never reaches Hypastack's servers, the file is only ever readable by someone holding the complete link.

<Warning>
  If you lose the link, the file cannot be recovered by Hypastack. There is no password reset for a URL fragment.
</Warning>

## Deleting a file early

You can delete a file from your dashboard at any time before it expires. Deletion is immediate and irreversible, Hypastack does not keep soft deletes or hidden backups of file content.

## Custom links

On paid plans, you can set a custom slug for the share link instead of a generated one. See [Pricing & Plans](/pricing) for which tiers include this.