Tried firecrawl/pdf-inspector: A Fast Rust Layer for Smarter PDF Routing

firecrawl/pdf-inspector is a Rust library for inspecting, classifying, and extracting text from PDF files. Its most useful capability is distinguishing scanned, image-heavy documents from PDFs that already contain an accessible text layer. That classification enables better routing decisions before expensive downstream processing begins.

The project is gaining attention, with +199 GitHub stars today, likely because it addresses a practical bottleneck in document pipelines: not every PDF should be sent through the same OCR or extraction path.

For a gateway engineer, this distinction is valuable. Text-based PDFs can usually take a lightweight extraction route, while scanned documents can be queued for OCR only when necessary. That reduces unnecessary compute, improves latency, and makes team token quotas easier to govern when extracted content is later passed to language models.

A minimal local test might look like this:

git clone https://github.com/firecrawl/pdf-inspector.git
cd pdf-inspector

cargo run --release -- \
  ./samples/document.pdf

The exact command-line interface may evolve, so I would verify the current examples and API definitions in the repository before integrating it into automation.

A sensible deployment pattern is to keep inspection inside a private worker network:

Upload gateway
  -> PDF inspector worker
      -> text extraction path
      -> OCR queue for scanned PDFs
          -> controlled processing service

This architecture keeps raw documents within the private network and allows the gateway to enforce file-size limits, concurrency limits, and per-team quotas before any external processing is considered. For sensitive workloads, the worker should avoid persistent logs containing document content; record only metadata such as file size, page count, classification, duration, and failure reason.

Dockerizing the worker is also straightforward with a multi-stage Rust build. Compile dependencies in a builder image, then copy only the release binary into a minimal runtime image. The main trade-off is operational maturity: PDF edge cases, malformed files, and mixed scanned/text documents still require a test corpus and defensive timeouts.

Overall, pdf-inspector looks like a focused, high-leverage component for document gateways rather than a complete PDF processing platform.