Stirling-PDF: Open-Source Free All-in-One PDF Platform with 50+ Tools and Self-Hosting

Created

Do you frequently need to process PDF files — merging documents, extracting pages, encrypting files, or converting scanned images to searchable text? Every time you open an online tool, upload your file, wait for processing, then download? And the worrying part is that all these files are uploaded to someone else’s server.

That is the problem Stirling-PDF solves. It is a completely open-source, completely free PDF tool platform with 50+ PDF operations, supporting self-hosted deployment so your files never leave your own server.

What is Stirling-PDF? Stirling-PDF is an open-source free all-in-one PDF processing platform built on Java, offering 50+ PDF operations (editing, merging, splitting, OCR, conversion, signing, compression, and more), supporting Docker self-hosting, desktop app, and REST API — serving as an open-source alternative to iLovePDF and Smallpdf.

Key Data:

  • 🌟 GitHub Stars: 83,600+ (Repository)
  • 🍴 Forks: 7,200+
  • ⚖️ License: MIT (open-core)
  • 🧠 Core Feature: 50+ PDF Tools — Edit, merge, split, sign, OCR, compress, convert — everything you need
  • 📦 Core Feature: Self-Hosting — Docker one-click deployment, files never leave your server
  • 🔧 Core Feature: REST API — Nearly every tool has an API for integration into existing systems
  • 🤖 Core Feature: Automation Workflows — No-code pipelines for batch processing millions of PDFs
  • 🌍 Core Feature: 40+ Languages — Global multilingual interface support
  • 🏢 Core Feature: Enterprise-Grade — SSO, auditing, flexible on-prem deployments

Prerequisites

Before getting started with Stirling-PDF, you need:

  • A modern browser (Chrome, Firefox, Safari, Edge)
  • Docker environment (recommended) or Java 17+ runtime

💡 Tip: Stirling-PDF offers multiple deployment options: Docker (recommended), desktop app, and Kubernetes. The simplest way is Docker one-click startup.

Overview

This article provides a comprehensive look at Stirling-PDF, covering:

  1. Core features and 50+ PDF operations
  2. Getting started: Docker deployment and desktop app
  3. Enterprise features: API, SSO, automation workflows
  4. Comparison with alternatives
  5. Use cases and advanced tips

Step-by-Step Guide

Step 1: Getting Started — Docker Deployment

The simplest way is to use Docker for one-click startup:

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docker run -p 8080:8080 docker.stirlingpdf.com/stirlingtools/stirling-pdf

After startup, visit http://localhost:8080 to use Stirling-PDF.

💡 Tip: First startup downloads dependencies and may take a few minutes. For production, recommend mounting persistent storage volumes.

Step 2: Desktop Application

If you prefer not to use Docker, Stirling-PDF also offers a desktop application:

  1. Visit GitHub Releases to download the installer for your system
  2. Install and open directly
  3. No network connection required — runs completely locally

Step 3: Core Features

50+ PDF Tools

Stirling-PDF provides a toolset covering nearly all PDF operations:

Editing:

  • Text editing, image insertion, page rotation, cropping
  • Watermarks, headers/footers, bates numbering
  • Form filling and creation

Conversion:

  • PDF to Word, Excel, PPT, HTML, images
  • Word, Excel, PPT, images to PDF
  • PDF/A format conversion

Security:

  • Password protection, permission settings
  • Content redaction
  • Digital signatures
  • PDF flattening

OCR:

  • Scanned document text recognition
  • Multi-language OCR support
  • Batch OCR processing

Organization:

  • Merge, split, rearrange pages
  • Extract specific pages
  • Page cropping and resizing

Compression:

  • PDF file compression
  • Image optimization
  • Batch compression

Automation Workflows

Stirling-PDF supports no-code automation pipelines:

  • Create processing pipelines directly in the UI
  • Supports conditional logic and loops
  • Can process millions of PDF files
  • Trigger and monitor via API

REST API

Nearly every PDF tool has a corresponding API:

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# Example: Merge PDFs via API
curl -X POST http://localhost:8080/api/v1/general/merge-pdfs \
  -F "fileInput=@file1.pdf" \
  -F "fileInput=@file2.pdf" \
  -o merged.pdf

API documentation: https://registry.scalar.com/@stirlingpdf/apis/stirling-pdf-processing-api/

Enterprise Features

  • SSO — LDAP, OAuth, and enterprise authentication support
  • Audit Logging — Complete operation records
  • Flexible Deployment — Docker, Kubernetes, bare metal
  • 40+ Languages — Globalized support

Step 4: Team Collaboration

Stirling-PDF supports multi-user deployment:

  • Multiple people using the same instance simultaneously
  • User permission management
  • Operation audit tracking
  • Private API integration into internal systems

Comparison with Alternatives

Feature Stirling-PDF iLovePDF Smallpdf PDFsam OpenPDF
Open Source ✅ MIT ❌ ❌ ✅ AGPL-3.0 ✅ LGPL/MPL
Free ✅ Completely free ⚠️ Free tier ⚠️ Free tier ✅ Completely free ✅ Completely free
Self-Hosting ✅ Docker/K8s ❌ ❌ ✅ ✅
PDF Tools 50+ 25+ 20+ 10+ Library-level
OCR ✅ Multi-language ⚠️ Paid ⚠️ Paid ❌ ❌
Automation Workflows ✅ No-code ❌ ❌ ❌ ❌
REST API ✅ Comprehensive ⚠️ Limited ⚠️ Limited ❌ ✅
Desktop App ✅ ❌ ✅ ✅ ❌
SSO/Enterprise ✅ ❌ ⚠️ Paid ❌ ❌
Multi-language UI ✅ 40+ ✅ 25+ ✅ 20+ ✅ 15+ ❌
GitHub Stars 83,600+ N/A N/A 4,400+ 4,200+
Positioning All-in-one PDF platform Online PDF tool Online PDF tool PDF split/merge PDF dev library

Key Differences:

  1. Stirling-PDF vs iLovePDF/Smallpdf: Stirling-PDF is fully open-source and free with self-hosting support; files never leave your server. iLovePDF and Smallpdf are commercial tools that are easy to use but have file size limits on free tiers and require uploading files to third-party servers.

  2. Stirling-PDF vs PDFsam: Stirling-PDF is more comprehensive (50+ tools vs 10+) with OCR, automation workflows, and API support; PDFsam focuses primarily on PDF split/merge with limited features.

  3. Stirling-PDF vs OpenPDF: Stirling-PDF is a complete application platform with UI and one-click deployment; OpenPDF is a development library requiring programming to use.

  4. Stirling-PDF vs iText: Stirling-PDF targets end users with out-of-the-box functionality; iText is a developer-focused PDF library that is powerful but requires programming.

FAQ

Q: Is Stirling-PDF really completely free?
A: Yes. Stirling-PDF uses the MIT open-source license with all features free to use. However, some enterprise features (like advanced SSO) may require paid support.

Q: How does Stirling-PDF differ from iLovePDF?
A: Stirling-PDF is open-source, supports self-hosting, and files never leave your server. iLovePDF is a commercial online tool that is easy to use but has file size limits (25MB on free tier) and requires uploading files to third-party servers.

Q: What are the technical requirements for self-hosting?
A: Docker is the simplest option — one command to start. Minimum specs: 1 CPU core, 1GB RAM. Production recommends 2 CPU cores, 4GB RAM.

Q: What file formats does Stirling-PDF support?
A: Supports conversion between PDF and Word, Excel, PPT, HTML, images (JPG, PNG, etc.), plus PDF/A format conversion.

Q: How is Stirling-PDF’s OCR quality?
A: Stirling-PDF integrates the Tesseract OCR engine with multi-language text recognition. Works well for clear scanned documents but may require manual proofreading for handwriting or blurry documents.

Q: Can I batch process PDF files?
A: Yes. Stirling-PDF supports automation workflows — create no-code pipelines in the UI to batch process large numbers of PDFs. You can also integrate with automation scripts via REST API.

Q: What scenarios is Stirling-PDF suitable for?
A: Ideal for individuals, teams, and enterprises with data privacy requirements. Especially when processing sensitive documents (legal files, financial reports, medical records), self-hosting ensures files never leave your control.

Q: Where is the Stirling-PDF API documentation?
A: Official API documentation: https://registry.scalar.com/@stirlingpdf/apis/stirling-pdf-processing-api/

Advanced Tips

Batch Processing Best Practices

  1. Use Automation Workflows — Create processing pipelines in the UI to avoid repetitive operations
  2. Leverage REST API — Integrate into scripts for scheduled batch processing
  3. Docker Compose — Use Docker Compose to manage multi-instance deployments

Secure Document Processing

  1. Self-Hosted Deployment — Ensure files never leave your server
  2. Enable HTTPS — Configure SSL with a reverse proxy
  3. Access Control — Configure user authentication and permissions
  4. Audit Logging — Enable operation records to track document processing history

Integration with Other Tools

  1. Webhooks — Listen for processing completion events
  2. API Integration — Embed PDF processing into existing workflows
  3. Automation Scripts — Use curl or SDK to call APIs

Conclusion

Stirling-PDF is a revolutionary open-source PDF tool platform that gives teams full control over their document processing infrastructure through 50+ tools and self-hosting capabilities. Whether you are an individual user, startup team, or large enterprise, Stirling-PDF provides professional-grade PDF processing tools while avoiding vendor lock-in and subscription fees.

Key Feature Recap:

  • Completely open-source and free (MIT license)
  • 50+ PDF tools
  • Docker self-hosted deployment
  • Comprehensive REST API support
  • Automation workflows
  • Enterprise SSO and auditing
  • 40+ language interface
  • 83,600+ GitHub Stars

This is the complete guide to Stirling-PDF setup and usage. From a single Docker command to enterprise deployment, you now have full control over your PDF processing workflow. Visit the Stirling-PDF GitHub Repository to get started today!

Resources

How to cite this article: This article is based on the Stirling-PDF GitHub Repository (verified 2026-06-24). All commands and configurations are verified against the latest version. Competitor data from GitHub API (queried 2026-06-24).