Is there a file size limit?

We recommend files under 5MB. Base64 strings are 33% larger than the original file, and copying massive strings can crash your browser tab.

Yes. The encoding process happens entirely on your local machine using client-side JavaScript. No data is sent to our servers.

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PDF Tools

Convert a PDF file into a Base64 string for embedding in HTML, JSON, or databases.

Last updated August 1, 2026

No server required—your PDF never leaves your device.
Instant conversion using the browser's FileReader API.
Generates the full data URI string ready to be used in `src` or `href` attributes.

API Payloads

Convert a PDF invoice to Base64 to transmit it securely inside a JSON payload.

HTML Embedding

Embed small PDF documents directly into a web page using a data URI to save an HTTP request.