PDF Infrastructure
for Developers
Stirling provides PDF APIs, MCPs, and an open-source editor for the world's most secure enterprises.
Used by 75% of the Fortune 500
Used by 75% of the Fortune 500
APIs & SDKs
The most popular PDF platform for developers
Integrate GitHub's #1 open-source PDF engine. Automate security, compliance, and editing pipelines with a few lines of code.
APIs & SDKs
The most popular PDF platform for developers
Integrate GitHub's #1 open-source PDF engine. Automate security, compliance, and editing pipelines with a few lines of code.
Agents
A powerful, deterministic toolkit for AI agents
Summarize, redact, and transform documents using local LLMs. Zero data leaves your machine.
Agents
A powerful, deterministic toolkit for AI agents
Summarize, redact, and transform documents using local LLMs. Zero data leaves your machine.
Editor
A fast, secure PDF editor that runs inside the firewall
Lightning-fast viewing, reading, and editing. Open gigabytes of blueprints, legal bundles, and technical manuals instantly.
Editor
A fast, secure PDF editor that runs inside the firewall
Lightning-fast viewing, reading, and editing. Open gigabytes of blueprints, legal bundles, and technical manuals instantly.
Deployment Options
Run Stirling on any infrastructure.
From air-gapped bare metal to private cloud VPCs. Zero vendor lock-in.
Deployed in 55K companies
Scarf Analytics, 2026
Military & Defense
Process classified intelligence in completely air-gapped environments.
Government
Secure citizen data and ensure digital sovereignty for public records.
Healthcare
HIPAA-compliant document processing for health systems of all sizes.
Industrials
Protect intellectual property, schematics, and technical blueprints.
Financial Services
Automate loan processing and KYC with zero data leakage.
Legal Services
Accelerate e-discovery and contract review behind the firewall.
Insurance
Speed up claims adjudication with automated data extraction.
Energy
Manage critical infrastructure docs in remote, offline environments.
Deployed in 55K companies
Scarf Analytics, 2026
Military & Defense
Process classified intelligence in completely air-gapped environments.
Government
Secure citizen data and ensure digital sovereignty for public records.
Healthcare
HIPAA-compliant document processing for health systems of all sizes.
Industrials
Protect intellectual property, schematics, and technical blueprints.
Financial Services
Automate loan processing and KYC with zero data leakage.
Legal Services
Accelerate e-discovery and contract review behind the firewall.
Insurance
Speed up claims adjudication with automated data extraction.
Energy
Manage critical infrastructure docs in remote, offline environments.
Deployed in 55K companies
Scarf Analytics, 2026
Military & Defense
Process classified intelligence in completely air-gapped environments.
Government
Secure citizen data and ensure digital sovereignty for public records.
Healthcare
HIPAA-compliant document processing for health systems of all sizes.
Industrials
Protect intellectual property, schematics, and technical blueprints.
Financial Services
Automate loan processing and KYC with zero data leakage.
Legal Services
Accelerate e-discovery and contract review behind the firewall.
Insurance
Speed up claims adjudication with automated data extraction.
Energy
Manage critical infrastructure docs in remote, offline environments.
Testimonials
Validated by security experts worldwide
Business leaders, software developers, and creators around the world share why they trust Stirling.
Manuel Dorne
Cybersecurity Expert, Korben
“Stirling PDF is the ultimate tool for manipulating your PDFs. For those worried about their privacy, don't panic. Your files stay safe and sound on your machine."
Akash Rajpurohit
Sr Software Engineer, Levels.fyi
“Stirling PDF has become an essential part of my document processing pipeline....It creates a powerful automated workflow that handles my documents securely and efficiently”
Vikash Jhagroe
Sr Technical Adoption Manager, VMware
"This is the one PDF Editor to rule them all! My quest for the perfect PDF editor finally paid off. Meet Stirling PDF, the only PDF editor you will ever need."
Carlos Melantuche
Sr Network and Infrastructure Engineer, Aramark
"Stirling PDF is the ultimate PDF editor. DO NOT use Adobe Acrobat Pro. Use Stirling PDF."
Zack Whittaker
Security Editor, TechCrunch
“For those who don’t want to pony up for Adobe’s software or upload their files to sketchy-looking file conversion websites, Stirling PDF is the Swiss Army knife for PDF documents."
Parth Shah
Tech Writer, XDA Developers
"Here is where Stirling PDF surprised me. It’s far from a basic PDF viewer or a simple converter. Almost every single tool comes with a ton of customization options."
Manuel Dorne
Cybersecurity Expert, Korben
“Stirling PDF is the ultimate tool for manipulating your PDFs. For those worried about their privacy, don't panic. Your files stay safe and sound on your machine."
Akash Rajpurohit
Sr Software Engineer, Levels.fyi
“Stirling PDF has become an essential part of my document processing pipeline....It creates a powerful automated workflow that handles my documents securely and efficiently”
Haroon Javed
Tech Writer, How to Geek
"What started as a quick test has turned into my go-to PDF tool—quietly replacing everything else I used before."
Manuel Dorne
Cybersecurity Expert, Korben
“Stirling PDF is the ultimate tool for manipulating your PDFs. For those worried about their privacy, don't panic. Your files stay safe and sound on your machine."
Akash Rajpurohit
Sr Software Engineer, Levels.fyi
“Stirling PDF has become an essential part of my document processing pipeline....It creates a powerful automated workflow that handles my documents securely and efficiently”
Vikash Jhagroe
Sr Technical Adoption Manager, VMware
"This is the one PDF Editor to rule them all! My quest for the perfect PDF editor finally paid off. Meet Stirling PDF, the only PDF editor you will ever need."
Carlos Melantuche
Sr Network and Infrastructure Engineer, Aramark
"Stirling PDF is the ultimate PDF editor. DO NOT use Adobe Acrobat Pro. Use Stirling PDF."
Take control of your PDFs.
Join the Fortune 500 teams moving their document infrastructure behind the firewall.
Take control of your PDFs.
Join the Fortune 500 teams moving their document infrastructure behind the firewall.