Rodeoclash

Rodeoclash

State of PDF handling in Elixir

Hello all. We have a requirement to render text over the top of an existing PDF. In detail this would be something like:

  1. Starting with an existing multi-page PDF document.
  2. Place text at an x, y location on particular page.
  3. Repeat until all text and images have been placed.

Keeping this in mind, has anybody done something similar to this with Pdf — PDF v0.7.1 (or any other PDF library in Elixir).

Trying to figure out if this is something we can do natively or if we’re going to need to reach for a third party library. The text_at functionality of the Pdf library certainly looks like what we need however I’m a bit unclear if this library can work with existing documents.

Thanks!

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jeroenbourgois

jeroenbourgois

We are calling pdfcpu with commands (the binary, no NIFs) to:

  • combine PDFs
  • render stamps

To get info about the pdf we use pdfinfo in the same way. pdfcpu also has an API so you could build a NIF but for us the binary works pretty wel, it’s very fast and lightweight.

woody

woody

Would be interested to hear what you went with? I couldn’t find anything that was pure Elixir, but have gotten good results using a NIF and the Rust library lopdf.

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