File to Base64 (from URL)

The File to Base64 module downloads a file from a URL and returns its Base64 encoding plus a ready-to-embed data URI. It is the quickest way to inline logos, icons or fonts into HTML templates in Make.com.

How it works

You provide a public URL. The module downloads the file (following redirects), detects its content type, and returns the raw Base64 string alongside a complete data URI like data:image/png;base64,iVBOR... that you can drop straight into an src attribute or a CSS rule.

Module Fields

Field	Description	How to use it
Connection	Links the module to the CustomJS service	Select or create a connection using your API key
File URL	The file to download and encode	A public `http(s)` URL. Redirects are followed automatically. Maximum file size is 8 MB

Usage example

Embed a company logo into a PDF invoice template:

File to Base64: File URL https://example.com/logo.png
Map the Data URI output into your HTML template:

<img src="{{Data URI}}" alt="Logo" width="160">

Pass the HTML to the HTML to PDF module.

The logo is now part of the HTML itself, so the PDF renderer never has to fetch it, which makes rendering faster and immune to broken image links.

Output

Output	Description
Base64	The raw Base64 string of the file content
Data URI	A complete `data:<content-type>;base64,...` string, ready for `src` attributes or CSS `url()` values
Content Type	The detected MIME type, e.g. `image/png`
Size (bytes)	The file size in bytes

Good to know

Typical use is PDF templates. Embedding logos, icons or fonts via the data URI is the most reliable way to get assets into HTML to PDF renders. The same pattern works with the HTML to PDF REST API.
8 MB limit. Files larger than 8 MB throw an error. Resize or compress large images before encoding; Base64 also inflates data by roughly a third, so smaller is better anyway.
Public URLs only. The URL must be reachable without authentication over http(s).