Stirling-PDF
FreemiumSelf-hosted PDF toolkit with 60+ tools
About Stirling-PDF
Stirling-PDF is a self-hosted web app for PDF operations built with Java and Spring Boot. Around 50K GitHub stars — one of the fastest-growing self-hosted tools on GitHub in 2024. Runs in a single Docker container with no external dependencies. Operations include merge, split, compress, rotate, reorder pages, OCR via Tesseract, convert to and from HTML/images/Word, watermark, password protection, and metadata editing. Everything processes on-device with no files sent to external servers, making it the privacy-preserving alternative to SmallPDF, ILovePDF, or Adobe Acrobat for one-off PDF work. The web UI is clean and works from any browser without installing anything. Reddit homelab users love it for document management workflows. Complaints focus on slower processing for large PDFs — OCR on a 200-page document can take several minutes — and Tesseract OCR quality being lower than commercial alternatives like Adobe. Java heap memory should be tuned up for production; default settings can cause OOM errors on large files.
Key Features
Pricing Plans
Self-Hosted
- Free forever
- All 60+ tools
- Your own server
Server License
- Unlimited users
- SSO integration
- Priority support
Enterprise
- Custom pricing
- Audit logging
- Google Drive integration
Pros
- 60+ PDF operations in one tool
- Dead simple Docker deployment
- Documents never leave your server
- Active development (76K GitHub stars)
- API-first for workflow automation
- Ultra-lite image available (1GB RAM)
Cons
- Text editing still in alpha
- Not a full Adobe Acrobat replacement
- OCR requires full Docker image
- No real-time collaborative editing
- Enterprise features are newer
- No native mobile app
Best For
- Privacy-conscious PDF processing without uploading to cloud services
- Home office document management alongside Paperless-ngx
- Teams replacing SmallPDF or ILovePDF for recurring PDF work
- Homelab setups needing a browser-accessible PDF toolbox
Not Ideal For
- High-accuracy OCR requirements — Tesseract quality is below Adobe
- Processing very large PDFs frequently without tuning Java heap
Potential Deal Breakers
- OCR quality below commercial alternatives for complex scanned documents
- OOM errors on large files without Java heap tuning
- Slower than cloud-based alternatives for large document batches
Data & Privacy
Self-hosted PDF toolkit. All documents processed locally on your server. No files sent externally. No telemetry. No cloud dependency. Complete document privacy.
Who Is This For?
Hands-on tested May 2026
Signup Experience
No signup or account needed. Deploy via Docker with a single command and access via browser. The interface is immediately usable with no configuration required beyond the initial install.
For Home Users
The definitive answer to uploading sensitive PDFs to random online tools. Merge, split, compress, and convert files on your own machine. OCR and form filling work without any documents leaving your server.
For Business Users
Covers the full PDF workflow that previously required Adobe Acrobat licenses. OCR, watermarking, form filling, and batch processing all included at no cost. Self-hosting means sensitive contracts and documents never touch a third-party server — a meaningful compliance advantage.
Our Verdict
Stirling-PDF is the obvious self-hosted answer for PDF operations. The single-container setup, browser-based UI, and on-device processing make it genuinely useful. Tesseract OCR is good enough for most documents but won't match Adobe Acrobat on complex scanned pages.