Attach files to a PDF — and extract them — without a server
Embed files inside a PDF (Factur-X invoices, supporting documents, sources) or extract them, in the browser — no upload.
Published on 5 min readby Hamza El Hajjaji
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Table of contents
The PDF as a container
A PDF isn’t just a document image: it’s a container. It can carry complete files inside — visible in the “attachments” panel of compatible readers — without changing its appearance.
European e-invoicing relies on this mechanism: a human-readable PDF embedding a structured XML file readable by accounting software. One file, two audiences. The same principle applies to attaching a receipt, a specification document, or a report’s source data.
Extracting attachments from a received PDF
When receiving a container PDF — a Factur-X invoice, a technical file — the reverse tool unpacks the embedded files for separate processing: import the XML into software, check the receipt, index the source.
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