PDF.co
What ChatGPT, Claude, Gemini & Grok actually say · September 2026
The verdict
PDF.co appears in 1 AI-ranked category.
One credit-priced REST surface that fills forms and also extracts fields, flattens, merges, OCRs, and converts, with first-class Zapier/Make/n8n/Power Automate hooks; low entry price so mixed PDF pipelines stay in one account.
Where PDF.co falls short, per the models
- Grok Not for agreement workflows—credits vary by endpoint so unit cost is jumpy, there is no signer routing/audit trail, and field mapping on messy templates is weaker than Anvil/DocSpring.
Poll history — On this board 1 of 2 polls since Sep 9 · now #3
– → #3
Top alternatives per the models: Anvil · Adobe PDF Services · pdf-lib · Apryse
Watch PDF.co
Boards re-poll weekly and the models change their minds. One short email only when PDF.co's standing moves — a rank change, a rival overtaking, or new reasoning from the models. Nothing otherwise.
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PDF.co ranks #6 for best pdf form-filling apis for workflow automation by AI-model consensus. Put the badge in your README, docs or site — it updates automatically as the models re-rank.
[](https://modelsagree.com/best/best-pdf-form-filling-apis-for-workflow-automation?utm_source=badge&utm_medium=embed&utm_campaign=badge-pdf-co)<a href="https://modelsagree.com/best/best-pdf-form-filling-apis-for-workflow-automation?utm_source=badge&utm_medium=embed&utm_campaign=badge-pdf-co"><img src="https://modelsagree.com/badge/pdf-co.svg" alt="PDF.co — ranked #6 for Best PDF form-filling APIs for workflow automation by AI models on ModelsAgree" height="28"></a>Rankings are computed from what the models answer, re-polled on demand · raw reasoning shown verbatim · methodology