DocGen Guide 128 tools · prices checked 20 Oct 2026 Find my tool
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JSON API to PPTX for contracts: 5 document generation tools

For contracts, we list 5 tools that turn JSON sent to an API into a PowerPoint deck. The lowest paid starting price is $28 a month after conversion to dollars, from Carbone. The first three in our order are Conga Composer, Formstack Documents and Carbone.

Tools
5
With USD price
4, from $28
Free tier
2
Direct / via Zapier
4 / 1
Checked
20 Oct 2026
  1. 01
    Conga Composer Editor's pick conga.com

    Enterprise Salesforce document generation.

    Outputs PDF, DOCX, XLSX, PPTX, HTML, email Template Word Also reads Salesforce G2 4.4 (849)
    Not published
  2. 02
    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
  3. 03
    Carbone Editor's pick carbone.io

    Priced in EUR: Essential EUR 29/mo (EUR 26 annual).

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Airtable, Zapier/Make/n8n
    $28 EUR 26, converted
  4. 04
    docxtemplater docxtemplater.com

    JS library, MIT/GPLv3 core.

    Outputs DOCX, PPTX, XLSX Template Word
    $45 EUR 500/yr, converted
  5. 05
    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

What differs for JSON API

For contracts delivered as PPTX, templates are built in Word (5), a visual builder (2) and a fillable PDF form (1). Among them, 1 needs Zapier, Make or n8n to read JSON sent to an API, so it sits after the tools with a direct connection. Of these, 2 have a free tier.

Besides PPTX, these tools for contracts also write DOCX (5), PDF (4) and XLSX (4). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $28 to $250 a month, the top end from Formstack Documents. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to PPTX (11 tools).

Related lists: JSON API to PPTX for reports (9 tools), JSON API to PPTX for invoices (7), JSON API to PPTX for proposals (6), JSON API to PDF for contracts (32), JSON API to DOCX for contracts (22), JSON API to XLSX for contracts (6).

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

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