
10 Best eSignature API Features for Developers in 2026
TL;DR: The best eSignature APIs do more than capture a
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CraftMyPDF helps HubSpot users turn CRM data into beautifully designed PDF documents in just a few clicks. Whether you are working with deals, contacts, companies, tickets, or custom objects, you can automatically generate documents using your existing HubSpot data.
Unlike basic document tools, CraftMyPDF gives you full design flexibility with a visual drag & drop PDF template editor, dynamic data binding, conditional logic, tables, charts, images, page breaks, and reusable templates.
Use CraftMyPDF to automate:
Perfect for sales, operations, customer onboarding, HR, and reporting workflows.
Need Help Getting Started? We are happy to help you set up your HubSpot integration or build your first PDF template. You can also follow our integration guide here: HubSpot Integration Documentation
No code required!
Our advanced editor allows you to easily create new PDFs by dragging and dropping the elements into your PDF templates.
You can create PDF documents easily such as invoices, reports, delivery notes that reflect your brand.
If you are still converting HTML code to PDFs and looking for an easy way to create PDF documents – Our PDF template editor does not require HTML or CSS knowledge.
Learn more about the PDF designer.
An expression is essentially a javascript syntax enclosed in {{ and }}. The expression is any valid set of variables, operators, and expressions that evaluates to a single value. The value may be a number, a string, an array or a logical value.
You may also use any of the standard built-in objects such as Math, String, Array or methods in the expressions.
Advanced Formatting with Expressions
Our template editor supports advanced formatting. You can easily format number, currency and date time with CraftMyPDF’s expressions.
The following is an example to format a currency field:
{{ format(data.total_amount, "number", "$0,0.0000") }}
curl -X POST \
--header "Content-Type: application/json" \
--header 'X-API-KEY: 7832MjA6MTE6UjlkM3h4emxpTExzeFR0aQ=' \
--data '{"template_id": "05f77b2b18ad809a", "export_type":"json", "expiration": 10, "output_file":"my_new.pdf", "data": "{ \"invoice_number\": \"INV38379\", \"date\": \"2021-09-30\", \"currency\": \"USD\", \"total_amount\": 82542.56 }", "output_file": "output.pdf"}' \
"https://api.craftmypdf.com/v1/create"
Streamline your workflow and save time on repetitive PDF document creation with our easy integrations with Zapier, Integromat, Bubble.io and REST API.
We support regional API-endpoints. A regional API endpoint is intended for customers in the same region. The data for the request and generated PDFs are processed and stored within the region.
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TL;DR: The best eSignature APIs do more than capture a

DocRaptor, PDF Noodle, and CraftMyPDF all turn data into documents, but they are built for very different workflows, from pure conversion to full automation. We will judge each one on rendering quality, pricing model, AI and template features, integrations, compliance, and how well it scales.

Learn how to add e-signature fields to PDFs and automate your signing workflow with CraftMyPDF. This guide shows you how to import a PDF, place signature fields, assign signers, and generate signable documents using simple JSON data and API automation.

PDF Generator API, PDFMonkey, and CraftMyPDF all help you generate PDFs, but they are built for different workflows. This comparison looks at their features, pricing, template editors, integrations, and compliance options so you can choose the best PDF generation API for your product or automation.
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