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JSON API to PDF for onboarding packs: 7 document generation tools

For onboarding packs, we list 7 tools that turn JSON sent to an API into a PDF. The lowest paid starting price is $20 a month, from DocuSeal. The first three in our order are Formstack Documents, Anvil and DocSpring.

Tools
7
With USD price
7, from $20
Free tier
5
Direct / via Zapier
5 / 2
Checked
20 Oct 2026
  1. 01
    Formstack Documents Editor's pick formstack.com

    Formerly WebMerge. Only in Suite plan, $250/mo paid annually, 250 deliveries/mo.

    Outputs PDF, DOCX, PPTX, e-sign documents Template Word, PDF form, Visual builder Also reads Salesforce, HubSpot, Airtable, built-in forms +2 G2 4.5 (148)
    $250 / mo
  2. 02
    Anvil Editor's pick useanvil.com

    PDF fill, generate, e-sign API.

    Outputs PDF, e-sign documents Template PDF form, HTML
    $99 / mo
  3. 03
    DocSpring docspring.com

    PDF form filling and HTML PDFs.

    Outputs PDF Template PDF form, HTML
    $49 / mo
  4. 04
    Docupilot Editor's pick via Zapier docupilot.com

    Starter $29/mo, 100 docs.

    Outputs PDF, DOCX, PPTX, XLSX, e-sign documents Template Word, Visual builder Also reads Airtable, Zapier/Make/n8n, built-in forms
    $29 / mo
  5. 05
    Crove via Zapier crove.app

    Individual $33/mo billed $390/yr.

    Outputs PDF, DOCX, e-sign documents Template Word, Visual builder Also reads built-in forms, Zapier/Make/n8n
    $33 / mo
  6. 06
    DocuSeal docuseal.com

    Open-source e-sign and PDF form builder.

    Outputs PDF, e-sign documents Template PDF form Also reads built-in forms
    $20 / mo, cheapest here
  7. 07
    Dropbox Sign API sign.dropbox.com

    Adjacent e-sign API with templates.

    Outputs e-sign documents, PDF Template PDF form
    $75 / mo

What differs for JSON API

For onboarding packs delivered as PDF, templates are built in a fillable PDF form (5), Word (3) and a visual builder (3). Among them, 2 need Zapier, Make or n8n to read JSON sent to an API, so they sit after the tools with a direct connection. Of these, 5 have a free tier.

Besides PDF, these tools for onboarding packs also write e-sign documents (6), DOCX (3) and PPTX (2). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $20 to $250 a month, the top end from Formstack Documents. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to PDF (63 tools).

Related lists: JSON API to PDF for invoices (35 tools), JSON API to PDF for reports (35), JSON API to PDF for contracts (32), JSON API to PDF for certificates (15), JSON API to e-sign documents for onboarding packs (6).

How to generate PDFs from a JSON API: a step-by-step guide, updated 21 Oct 2026.

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