# Reference

Concept-level reference for `docx2pdf-cli`. Each file is the canonical home for one topic — everything else in the repo links here.

| File | Topic |
|---|---|
| [backends.md](backends.md) | The six backends — fidelity, requirements, when to pick each, auto-selection order. |
| [doctor.md](doctor.md) | The `--doctor` JSON shape, what `recommendation` means, the install-command convention. |
| [exit-codes.md](exit-codes.md) | The exit-code map every command honors, plus the structured-error envelope. |
| [json-output.md](json-output.md) | The per-file success envelope and the NDJSON batch shape. |