Feature

A REST API to build stamping into your workflows

Automate the stamping and numbering of your legal exhibits straight from your own software.

Manual stamping does not scale

Large law firms, legal software vendors and corporate IT departments face document volumes that make manual stamping impractical: hundreds of exhibits a day, repetitive processes, integration with existing document management or workflow tools.

The HelloStampPdf REST API lets you plug our stamping capability straight into your infrastructure, with a simple implementation and complete documentation.

A simple integration in a few lines

Send your PDFs and get your stamped documents back in milliseconds.

# Stamp a PDF through the REST API

curl

-X POST https://api.hellostamppdf.fr/v1/stamp \

-H "Authorization: Bearer YOUR_API_KEY" \

-F "file=@piece_01.pdf" \

-F "stamp_text=PIÈCE N°" \

-F "stamp_shape=round" \

-F "piece_number=1" \

--output piece_01_tampon.pdf

// JSON response

{

"status": "success",

"file_url": "https://...",

"pages_stamped": 12,

"expires_at": "2026-02-25T18:00:00Z"

}

An API designed for developers and IT teams

Everything needed for a fast, reliable integration.

Secure API keys

Create and revoke your API keys from your dashboard. Each key is unique, encrypted and can be usage-limited.

Complete documentation

Detailed technical documentation with code samples in Python, JavaScript, PHP and cURL. Swagger and OpenAPI available.

Real-time responses

The API responds in under two seconds for standard PDFs. Asynchronous processing is available for large volumes.

Batch processing

Send several PDFs in a single request for batch processing. Ideal for high-volume automated workflows.

Notification webhooks

Receive a webhook notification as soon as a document is processed. Easy to plug into any orchestrator.

SLA and high availability

99.9% API availability with real-time monitoring. Files are deleted automatically after delivery.

Who integrates the HelloStampPdf API?

Legal software vendors

Vendors of practice management tools — document management, case files, billing — integrate the API to add PDF stamping natively to their product, without building this technically demanding piece themselves.

IT departments of large legal organisations

IT departments of large firms and corporate legal teams automate the assembly of litigation files at scale by integrating HelloStampPdf into their internal tools.

LegalTech startups

Young LegalTech companies building document management, electronic filing or legal automation products use our API to get industrial-grade stamping quickly.

Why choose the HelloStampPdf API

In production in less than a day of development

Clear documentation with samples in Python, JavaScript, PHP and cURL

Usage-based pricing: pay only for what you consume

Dedicated technical support for integrators

GDPR compliance: data hosted in the EU, deleted automatically

No minimum volume: from 10 to 100,000 stampings a month

Ready to automate your PDF stamping?

Create your account to get your API keys and access the full documentation.

Get my API keys free See API pricing