In the latest versions of Chromium-based browsers (Chrome 83+), downloads from sandboxed iframes are blocked by default unless you explicitly add allow-downloads . 2. Configure Server-Side Headers
To prevent an from triggering automatic downloads, you typically need to use the without the allow-downloads flag or modify server-side headers like Content-Disposition . iframe prevent auto download
Modern browsers (Chrome, Edge, Safari, Firefox) have increasingly strict default policies that block "drive-by downloads"—automatic file downloads initiated within an iframe without a user gesture like a click. 1. Use the sandbox Attribute (Client-Side) In the latest versions of Chromium-based browsers (Chrome
If the iframe is automatically downloading a file (like a PDF or CSV) instead of displaying it, the issue is often the header sent by the server hosting the file. Consider blocking downloads from a sandboxed ``. Consider blocking downloads from a sandboxed ``
Simply add the sandbox attribute. Do not include the allow-downloads keyword.
The most effective way to lock down an iframe is the sandbox attribute. By default, a sandboxed iframe blocks almost everything, including downloads.
Use code with caution.