Document generation APIs
A JSON API source means your own application sends the data: a payload of fields and nested arrays, posted to the generator with a template ID. This hub lists 64 tools that accept it, the largest group on this site. Generation runs whenever your code calls the endpoint, from a checkout, a nightly job or a webhook. Ten editor’s picks accept API calls, and the first three in the list are Conga Composer, Formstack Documents and Documint, in review count order.
The APIs split two ways. HTML-to-PDF services such as DocRaptor, Api2Pdf and PDFShift render a page you build, so the layout is your HTML and CSS. Template APIs fill a document someone designed: Docmosis and docxtemplater fill tags in a Word file, and CraftMyPDF uses a visual editor. Nine tools run self-hosted or open source, including Gotenberg, WeasyPrint, jsreport and Carbone. Our records do not yet list SDK languages, so check each vendor’s docs for a client in your language.
Forty of the 64 have a free tier. Thirty-three price by usage tier, a monthly allowance of documents or credits, and Aspose.Words and Syncfusion sell developer licenses. The cheapest entry points are Api2Pdf at $1 a month plus bandwidth and compute, and PDFMonkey from EUR 5 a month, checked 20 Oct 2026. Teams that want an agency to build the integration can find implementation partners on AI Agency Radar.
- Tools
- 64
- With USD price
- 43, from $1
- Free tier
- 40
- Direct / via Zapier
- 56 / 8
- Checked
- 20 Oct 2026
- 01
Enterprise Salesforce document generation.
Outputs PDF, DOCX, XLSX, PPTX, HTML, email Template Word Also reads Salesforce G2 4.4 (849)Not published - 02
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 - 03
Silver $39/mo billed annually.
Outputs PDF, e-sign documents Template Visual builder Also reads Airtable, HubSpot, Coda, Zapier/Make/n8n G2 4.7 (9)$39 / mo - 04
Professional $19/mo yearly, $29 monthly.
Outputs PDF, Google Docs, email Template Google Docs, Word, PDF form Also reads Airtable, Notion, Google Sheets, Google Forms +2$19 / mo - 05
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 - 06
PDF fill, generate, e-sign API.
Outputs PDF, e-sign documents Template PDF form, HTML$99 / mo - 07
EUR pricing: Starter EUR 5/mo, 300 docs.
Outputs PDF Template HTML Also reads Zapier/Make/n8n$5 EUR 5, converted - 08
Fluent (Windward) windwardstudios.comFormerly Windward Studios, acquired by PDFTron (now Apryse).
Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Salesforce, Excel G2 4.4 (77)On request - 09 Xpertdoc xpertdoc.com
CCM and document generation with Microsoft Dynamics CRM connector.
Outputs PDF, DOCX, email, e-sign documents Template Word G2 4.3 (26)On request - 10
SourceToDocs sourcetodocs.comData to Google Slides and Docs.
Outputs Google Slides, Google Docs, PDF, PPTX, DOCX, HTML Template Google Docs Also reads Airtable, Google Sheets, CSV$19 / mo - 11
Knackly knackly.ioLegal document automation.
Outputs DOCX, PDF Template Word Also reads built-in forms, Zapier/Make/n8n$209 / mo - 12
Syncfusion Document SDK syncfusion.com$1,199/developer/yr (computed $99.92/mo).
Outputs PDF, DOCX, XLSX, PPTX Template Word$99.92 / mo
12 of 64 shown Show the other 52Hide the other 52
- 13
Templafy templafy.comAI document agents in Microsoft Office.
Outputs PPTX, DOCX, PDF Template Word Also reads Salesforce$40 / mo - 14
APITemplate.io apitemplate.ioPDF Basic $19 or $24 (billing labels unclear).
Outputs PDF Template Visual builder, HTML Also reads Airtable, Zapier/Make/n8n$19 / mo - 15
Bannerbear bannerbear.comImage, PDF and video API.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8n$49 / mo - 16
CraftMyPDF craftmypdf.comLite $29/mo, 1,200 PDFs. Free 50/mo.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8n$29 / mo - 17
Docmosis docmosis.comCloud Professional $49/mo, 4,000+ pages.
Outputs PDF, DOCX, HTML Template Word$49 / mo - 18
Docxpresso docxpresso.comEUR pricing shown as Core 2500 EUR/user/mo (likely 25.00, formatting unclear).
Outputs PDF, DOCX Template Word Also reads built-in forms$27 EUR 25/user, converted - 19 $45 EUR 500/yr, converted
- 20
DoxFlowy doxflowy.comCore $20/user/mo annual per Capterra.
Outputs PDF, e-sign documents Template Visual builder Also reads built-in forms$20 / mo - 21
Orshot orshot.comImage, PDF and video render.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8n$39 / mo - 22
PDF Generator API pdfgeneratorapi.comPriced in EUR, annual only: Creator EUR 80/yr.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8n$7 EUR 80/yr, converted - 23
Templated.io templated.ioImage, PDF and MP4 render API.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8n$29 / mo - 24
DocRaptor docraptor.comHTML to PDF via Prince. Basic $15/mo, 125 docs.
Outputs PDF, XLSX Template HTML$15 / mo - 25
Foxit Document Generation API developer-api.foxit.comWord template plus JSON. Startup $1,750/yr (computed $145.83/mo).
Outputs PDF, DOCX Template Word$145.83 / mo - 26
$15 / mo - 27
PDF.co pdf.coPDF API suite including HTML template to PDF.
Outputs PDF Template HTML Also reads Zapier/Make/n8n$8.99 / mo - 28 $1 / mo, cheapest here
- 29
$49 / mo - 30 $16 / mo
- 31
doqs.dev doqs.devPDF filling API. EUR pricing: Starter EUR 0.08/doc, Scale EUR 25/mo.
Outputs PDF Template PDF form$27 EUR 25, converted - 32
$9 / mo - 33 $19 / mo
- 34
Contractbook contractbook.comCentralize $399/mo annual, currency labels mixed.
Outputs PDF, e-sign documents Template Visual builder Also reads HubSpot, Salesforce, Pipedrive, Zapier/Make/n8nNot published free tier - 35
Experlogix Document Automation experlogix.comAlso Dynamics 365, SugarCRM, Power Platform.
Outputs PDF, DOCX, XLSX, email, e-sign documents Template Word Also reads SalesforceOn request - 36 jsreport jsreport.net
Free up to 5 templates. Enterprise $395/yr single instance.
Outputs PDF, DOCX, XLSX, PPTX, HTML Template HTMLOn request free tier - 37
Aspose.Words products.aspose.comSDK. Developer Small Business license $1,679 perpetual.
Outputs PDF, DOCX, HTML, Markdown Template WordOn request - 38
Gamma gamma.appAI presentations. Exports PPTX, PDF, Google Slides on Free.
Outputs PPTX, PDF, Google Slides Template Visual builder Also reads HubSpotNot published free tier - 39
Legito legito.comSmart document and contract automation.
Outputs DOCX, PDF, e-sign documents Template Visual builder, Word Also reads built-in formsNot published free tier - 40 ActiveDocs activedocs.com
Word-based enterprise document generation.
Outputs DOCX, PDF, e-sign documents Template WordOn request - 41
docassemble docassemble.orgMIT guided-interview and document assembly.
Outputs PDF, DOCX Template Word, PDF form Also reads built-in formsFree - 42
HotDocs mitratech.comOwned by Mitratech. Desktop and cloud.
Outputs DOCX, PDF Template Word Also reads built-in formsOn request - 43
PDF4me pdf4me.comYnoox GmbH. Generate Documents endpoint.
Outputs PDF, DOCX Template Word Also reads Zapier/Make/n8nNot published free tier - 44
Placid placid.appCreative automation for images, PDFs, video.
Outputs PDF Template Visual builder Also reads Airtable, Zapier/Make/n8nNot published - 45
Adobe Document Generation API developer.adobe.comPart of Adobe PDF Services.
Outputs PDF, DOCX Template WordOn request free tier - 46
Not published - 47
Gotenberg gotenberg.devMIT Docker API. HTML, Markdown and Office to PDF via Chromium and LibreOffice.
Outputs PDF Template HTMLFree - 48
Not published - 49 pdfme pdfme.com
MIT TypeScript library with WYSIWYG template designer.
Outputs PDF Template Visual builderFree - 50
Not published free tier - 51
WeasyPrint weasyprint.orgOpen-source HTML/CSS to PDF in Python by Kozea; support by CourtBouillon.
Outputs PDF Template HTMLFree - 52
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 - 53
Formerly Documate (Documate Inc. dba Gavel).
Outputs DOCX, PDF Template Word, PDF form Also reads built-in forms, Zapier/Make/n8n$83 / mo - 54
Micro $19.50/mo shown; price formatting unclear on page.
Outputs DOCX, XLSX, PDF Template Word Also reads Google Sheets, CSV, Excel, Zapier/Make/n8n +1$19.50 / mo - 55
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 - 56
Word templates plus JSON.
Outputs PDF, DOCX Template Word Also reads Coda, Zapier/Make/n8n$19 / mo - 57
JS and HTML-to-PDF functions for Make and n8n.
Outputs PDF Template HTML Also reads Zapier/Make/n8n$9 / mo - 58
EUR pricing: Breeze EUR 6.90/mo.
Outputs PDF Template Visual builder Also reads Zapier/Make/n8n$7 EUR 6.90, converted - 59
Starter $35/mo, 3,000 PDFs.
Outputs PDF Template Visual builder, HTML Also reads Zapier/Make/n8n$35 / mo - 60
Adjacent proposal and e-sign suite.
Outputs PDF, e-sign documents, DOCX Template Visual builder Also reads HubSpot, Salesforce, Pipedrive, Zapier/Make/n8n G2 4.7 (3324)$19 / mo - 61
DocuSeal docuseal.comOpen-source e-sign and PDF form builder.
Outputs PDF, e-sign documents Template PDF form Also reads built-in forms$20 / mo - 62 SignWell signwell.com
Adjacent e-sign with template API, 25 free API docs/mo.
Outputs PDF, e-sign documents Template PDF form Also reads Zapier/Make/n8n$10 / mo - 63
Dropbox Sign API sign.dropbox.comAdjacent e-sign API with templates.
Outputs e-sign documents, PDF Template PDF form$75 / mo - 64
$25 / mo
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Nearby pages
By output: PDF generators for JSON API (63 tools), JSON API to PDF (63), JSON API to DOCX (29), JSON API to e-sign documents (16), JSON API to PPTX (11), JSON API to XLSX (10), JSON API to HTML (7), JSON API to email (4).
By document type: Report generators for JSON API (36 tools), Invoice generators for JSON API (35), Contract generators for JSON API (33), Letter generators for JSON API (16), Certificate generators for JSON API (15), Proposal generators for JSON API (11), NDA generators for JSON API (8), Onboarding pack generators for JSON API (7), Compliance document generators for JSON API (7), Statement generators for JSON API (6), Quote generators for JSON API (4), Catalog generators for JSON API (4), Label generators for JSON API (4).
Related lists: Document generation for Zapier, Make or n8n (34 tools), Document generation for Salesforce (32), Document generation for HubSpot (27), Document generation for built-in forms (27), Document generation for Airtable (21), Document generation for Google Sheets (20), Document generation for Excel (8), Document generation for Google Forms (8).
How to generate PDFs from a JSON API: a step-by-step guide, updated 21 Oct 2026.
All tools, with filters for source, output, use case and price.
Questions about JSON API
5 answered- How do I generate PDFs from JSON API?
- On this page, 63 tools can build a PDF from JSON sent to an API. Conga Composer, Formstack Documents and Documint come first in our order.
- Is there a native option for JSON API?
- There is no native option for JSON API to compare against. Every one of the 64 tools here takes JSON sent to an API directly.
- Can I add line items to a JSON API document?
- Our records do not track line item support yet, so check each tool before you buy. None of the 64 records mentions linked records in its notes.
- How much does document generation for JSON API cost?
- Paid plans start at $1 a month with Api2Pdf. The highest published starting price here is $250 a month, from Formstack Documents. A free tier comes with 40 of them. No price is published for 17. Prices were checked on 20 Oct 2026.
- Can generation run automatically from JSON API?
- Yes. Your own code calls the API whenever it needs a document. Of the 64 tools, 24 connect to Zapier, Make or n8n.
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