2026-09-08
Embedding a PDF in a JSON payload or API request means Base64-encoding it first, and doing that for a real document is different from a text Base64 tool — you need a converter that actually handles binary files cleanly, not one built around pasting short strings.
| Tool | Built for file (not just text) encoding | Direct PDF-specific flow | Runs fully in your browser | File size limit |
|---|---|---|---|---|
| iLoveDevTools | Yes | Yes, dedicated tool | Yes | No hard limit |
| Base64.guru | Yes | Yes, dedicated file encoder | No (server upload) | Limited on the free tier |
PDF to Base64 converts a PDF file into a Base64 string entirely in your browser — useful for embedding documents in JSON payloads or API requests without a script, and without uploading the source PDF anywhere to do the conversion.
A dedicated file-to-Base64 site that handles PDFs and many other file types well, with a clear, purpose-built interface for exactly this use case. Files are uploaded to their servers to generate the encoded output.
For encoding a document you'd rather not upload just to Base64-encode it, iLoveDevTools keeps the file local. Base64.guru is a solid option if the file isn't sensitive and you need broader file-type support.