If you’re looking for an API to fill PDF forms, here are good options depending on your stack and needs: ### Popular PDF form-filling APIs - **Adobe Acrobat Services API** Good enterprise option. Supports PDF generation, manipulation, and form filling. - **Apryse (formerly PDFTron)** Strong SDK/API for PDFs, including AcroForm filling. - **PSPDFKit** Great for PDF editing and form workflows. - **Foxit PDF SDK / API** Another solid commercial PDF solution. - **DocSpring** Easy to use for filling PDF templates from data. - **PDF.co** API for filling forms, flattening, merging, etc. - **iText 7 / iText pdfForm** Powerful, but more of a library than a hosted API. ### If you want a simple hosted API **PDF.co** and **DocSpring** are usually easiest for “send JSON, get filled PDF back.” ### Typical workflow 1. Upload or reference a PDF form template 2. Map form fields to values 3. Send data to the API 4. Receive a filled PDF 5. Optionally flatten it so fields become non-editable ### Example use cases - Tax forms - Applications - Contracts - Insurance forms - HR onboarding docs ### If you want code-based filling Libraries like: - **iText** - **PyPDF2 / pypdf** - **pdfrw** - **Apryse SDK** can be used directly in your backend without a hosted API. If you want, I can give you: 1. a **list of the best APIs by language**, 2. a **sample API request to fill a PDF form**, or 3. a **Python/Node.js example**.

Prompt

pdf form fill api

Technology / Developer Tools1 observationLast seen Oct 12, 2026

Latest observation

Oct 12, 2026

OpenAI APIWeb search: off

If you’re looking for an API to fill PDF forms, here are good options depending on your stack and needs:

Popular PDF form-filling APIs

Adobe Acrobat Services API
Good enterprise option. Supports PDF generation, manipulation, and form filling.
Apryse (formerly PDFTron)
Strong SDK/API for PDFs, including AcroForm filling.
PSPDFKit
Great for PDF editing and form workflows.
Foxit PDF SDK / API
Another solid commercial PDF solution.
DocSpring
Easy to use for filling PDF templates from data.
PDF.co
API for filling forms, flattening, merging, etc.
iText 7 / iText pdfForm
Powerful, but more of a library than a hosted API.

If you want a simple hosted API

PDF.co and DocSpring are usually easiest for “send JSON, get filled PDF back.”

Typical workflow

Upload or reference a PDF form template
Map form fields to values
Send data to the API
Receive a filled PDF
Optionally flatten it so fields become non-editable

Example use cases

Tax forms
Applications
Contracts
Insurance forms
HR onboarding docs

If you want code-based filling

Libraries like:

iText
PyPDF2 / pypdf
pdfrw
Apryse SDK

can be used directly in your backend without a hosted API.

If you want, I can give you:

a list of the best APIs by language,
a sample API request to fill a PDF form, or
a Python/Node.js example.

Brands

Adobe Acrobat Services Api Apryse Pspdfkit Foxit Pdf Sdk Api

Docspring Pdf

Itext

Observation history

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