Stirling PDF vs ILovePDF: Self-Hosted PDF Tools You Own 2026

Q: Where Data Lives?

Stirling PDF: Files are processed entirely in memory or in temporary directories on your server. Per the official documentation: "Any file downloaded by the user will have been deleted from the server by that point." No telemetry. No analytics. No external calls. ILovePDF: Files are uploaded to iLovePDF's servers (hosted on AWS), processed, and made available for download. Files are deleted after 2 hours. The free plan's privacy policy is fairly permissive about aggregated usage data.

Every organization processes PDFs. Merge contracts. Compress reports. OCR scanned invoices. Redact sensitive fields before sharing. For years, cloud tools like ILovePDF and Smallpdf handled these tasks — but at a cost: your documents leave your network, processed on someone else's server, subject to their privacy policies.

Stirling PDF changes this equation. It's a self-hosted, open-source PDF toolkit with 50+ operations, deployable via Docker in minutes, with zero data leaving your server. This guide compares Stirling PDF against ILovePDF on features, privacy, compliance, and total cost of ownership.

Related: How to Self-Host Stirling PDF · Best Open Source Adobe Alternatives 2026 · Data Privacy Open Source Self-Hosting

Why PDF Privacy Matters More Than You Think

Before the feature comparison, consider what happens when you upload a PDF to a cloud tool:

Your file is transmitted to and stored on external servers
It may be retained for analytics, quality improvement, or legal compliance
For law firms, healthcare providers, and financial institutions — this creates real liability
Files may traverse multiple jurisdictions depending on CDN architecture

GDPR Article 28 requires that data processors have a Data Processing Agreement in place. ILovePDF offers this on its Business plan ($12/month+). But if you self-host Stirling PDF, the question becomes moot: data never leaves your infrastructure.

Stirling PDF: What It Is

Stirling-PDF is an open-source, self-hosted web-based PDF manipulation toolkit. It started as a simple merge/split tool and has grown into the most comprehensive self-hosted PDF solution available, with 60+ operations across categories including conversion, organization, security, and editing.

GitHub stats (2026): 47,000+ stars, actively maintained by the Stirling-Tools organization.

Full Feature List by Category

Organize

Merge multiple PDFs
Split PDF by page range, size, or bookmarks
Rearrange pages (drag-and-drop UI)
Remove pages
Rotate pages
Extract pages

Convert

PDF to Word, Excel, PowerPoint, HTML
Images (JPG, PNG, TIFF, BMP) to PDF
Office documents to PDF
HTML to PDF
PDF to CSV

Security

Add/remove password protection
Encrypt with 128-bit or 256-bit AES
Permissions management (print, copy, modify)
Redact text (regex or manual)
Certificate-based signing

Edit

Add watermarks (text or image)
Add headers/footers
Add/edit bookmarks
Compress PDF (multiple quality levels)
Repair corrupted PDFs
Flatten annotations

AI/OCR (optional)

OCR via Tesseract (35+ languages)
Searchable PDF output
Auto-crop scanned pages

View/Inspect

Multi-page PDF viewer with custom sorting
Extract images from PDFs
Compare two PDFs (diff view)
Metadata editor (read/write XMP metadata)

New in 2025–2026

Stateful processing: upload once, apply multiple operations without re-uploading
Undo/redo with full version history
On-page annotation and drawing tools
REST API for every operation

ILovePDF: What It Is

ILovePDF is a cloud-based PDF tool suite launched in 2010. It offers 25+ PDF tools through a browser interface and mobile apps, with a freemium model:

Free tier: Limited files per hour, max 100MB per file, watermarks on some outputs
Premium (~$7/month): Unlimited processing, no watermarks, larger file sizes
Business (~$12/month/user): SSO, custom branding, DPA available

ILovePDF is well-designed and fast — it's easy to recommend to individuals with no technical setup. But its limitations for organizational use are significant.

Feature Comparison Table

Feature	Stirling PDF	ILovePDF Free	ILovePDF Premium
Cost	Free (server cost)	Free	~$7/month
PDF Merge	Yes	Yes	Yes
PDF Split	Yes	Yes	Yes
OCR	Yes (Tesseract)	Yes	Yes
Compress	Yes (4 levels)	Yes	Yes
PDF to Word	Yes	Yes	Yes
PDF to Excel	Yes	Yes	Yes
Redaction	Yes (regex)	No	No
Watermark	Yes	Yes	Yes
Password Protect	Yes	Yes	Yes
Bulk Processing	Via API	Limited	Yes
REST API	Yes (all operations)	Paid API add-on	Paid API add-on
File Size Limit	None (your server)	100MB	2GB
Files Per Day	Unlimited	Limited	Unlimited
Data Stays On-Prem	Yes	No	No
GDPR DPA	N/A (you own data)	Not available	Business plan only
Offline Operation	Yes	No	No
Self-Host	Yes	No	No
Open Source	Yes (MIT/AGPL)	No	No

Docker Compose Setup

Getting Stirling PDF running takes under 5 minutes:

version: "3.3"
services:
  stirling-pdf:
    image: stirlingtools/stirling-pdf:latest
    restart: unless-stopped
    ports:
      - "8080:8080"
    volumes:
      - ./training-data:/usr/share/tessdata  # OCR language data
      - ./extraConfigs:/configs
      - ./logs:/logs
    environment:
      - DOCKER_ENABLE_SECURITY=false
      - INSTALL_BOOK_AND_ADVANCED_HTML_OPS=false
      - LANGS=en_GB

For the full OCR feature set, download Tesseract language packs:

# Download additional OCR language support
docker exec stirling-pdf bash -c \
  "apt-get install -y tesseract-ocr-deu tesseract-ocr-fra"

For the security/login module (multi-user access with roles):

environment:
  - DOCKER_ENABLE_SECURITY=true
  - SECURITY_ENABLELOGIN=true
  - SECURITY_INITIALLOGIN_USERNAME=admin
  - SECURITY_INITIALLOGIN_PASSWORD=yourpassword

Privacy and Compliance Deep Dive

Where Data Lives

Stirling PDF: Files are processed entirely in memory or in temporary directories on your server. Per the official documentation: "Any file downloaded by the user will have been deleted from the server by that point." No telemetry. No analytics. No external calls.

ILovePDF: Files are uploaded to iLovePDF's servers (hosted on AWS), processed, and made available for download. Files are deleted after 2 hours. The free plan's privacy policy is fairly permissive about aggregated usage data.

For EU organizations handling personal data in PDFs:

Scenario	Stirling PDF	ILovePDF
Process HR documents	Compliant (on-prem)	Requires DPA (Business plan)
Handle patient data (healthcare)	Compliant	Not recommended
Process legal filings	Compliant	Risky without DPA
Financial documents	Compliant	Assess per-jurisdiction

Air-Gapped Environments

Stirling PDF can run in fully air-gapped networks — government, defense, critical infrastructure. This is impossible with any cloud PDF tool. For these environments, Stirling PDF is often the only viable option.

REST API: Automating PDF Operations

Stirling PDF exposes a Swagger-documented REST API for every operation. Example: compress a PDF programmatically:

curl -X POST "http://localhost:8080/api/v1/general/compress-pdf" \
  -H "Content-Type: multipart/form-data" \
  -F "fileInput=@report.pdf" \
  -F "optimizeLevel=3" \
  --output compressed.pdf

OCR a scanned document:

curl -X POST "http://localhost:8080/api/v1/misc/ocr-pdf" \
  -H "Content-Type: multipart/form-data" \
  -F "fileInput=@scanned-invoice.pdf" \
  -F "languages=eng" \
  -F "sidecar=false" \
  --output searchable-invoice.pdf

ILovePDF offers an API too, but it's a paid add-on (~$0.01 per operation), and data still leaves your infrastructure.

Performance Comparison

On a 2-core, 4GB RAM server:

Operation	Stirling PDF	ILovePDF Cloud
Merge 10 PDFs (50MB total)	~3–5 sec	~8–15 sec (upload + process)
Compress 100-page PDF	~2–4 sec	~5–10 sec
OCR 20-page scanned doc	~15–30 sec	~20–40 sec

Network latency dominates ILovePDF's timing. For large files or bulk operations, local processing is reliably faster.

Total Cost of Ownership

ILovePDF Business (team of 10)

10 × $12/month = $120/month = $1,440/year

Stirling PDF Self-Hosted

2-core, 4GB VPS (Hetzner): ~$8–12/month
Maintenance time: ~30 min/quarter for updates
~$100–150/year total

For any team processing PDFs regularly, self-hosting Stirling PDF saves $1,200–1,300/year while providing better privacy and more features.

Stirling PDF vs Other Cloud Alternatives

Stirling PDF competes with more than just ILovePDF. The self-hosted privacy angle applies across the entire category:

Cloud Tool	Price	Key Limit	Stirling PDF Advantage
ILovePDF Premium	$7/mo	Data on cloud	On-prem, unlimited
Smallpdf Pro	$12/mo	2GB/file	No limits, offline
Adobe Acrobat Online	$19.99/mo	Adobe account required	No account, self-hosted
PDF24	Free (cloud)	Files processed externally	Full privacy
Foxit PDF	$14.99/mo	Desktop app required	Browser-based, self-hosted

For organizations, the comparison isn't just Stirling PDF vs one tool — it's Stirling PDF replacing all cloud PDF tools across the team for a single $10/month server.

Multi-User Access with Stirling PDF

For team deployments, Stirling PDF supports a login system with role-based access:

Roles available:

Admin: Full access to all tools + user management
User: Access to all PDF tools
Limited: Restricted to specific tool categories

This makes it suitable for organizations where you want PDF processing available to all staff without giving everyone admin access to the server.

# Enable security/login in docker-compose.yml
environment:
  - DOCKER_ENABLE_SECURITY=true
  - SECURITY_ENABLELOGIN=true
  - SECURITY_INITIALLOGIN_USERNAME=admin
  - SECURITY_INITIALLOGIN_PASSWORD=changeme
  - SECURITY_CSRF=true

After first login, the admin can:

Create additional user accounts
Assign roles
Optionally enable SSO via OAuth2 (Google, GitHub, Keycloak, etc.)

For enterprise SSO integration:

environment:
  - SECURITY_OAUTH2_ENABLED=true
  - SECURITY_OAUTH2_CLIENT_NAME=Google
  - SECURITY_OAUTH2_CLIENT_ID=your_google_client_id
  - SECURITY_OAUTH2_CLIENT_SECRET=your_google_client_secret
  - SECURITY_OAUTH2_SCOPES=openid,profile,email
  - SECURITY_OAUTH2_USE_AS_USERNAME=email

Updating and Maintenance

Stirling PDF releases frequently. The update process is straightforward:

# Pull latest image and restart
docker compose pull && docker compose up -d

# Or if using docker run directly
docker pull stirlingtools/stirling-pdf:latest
docker stop stirling-pdf
docker rm stirling-pdf
docker run -d [your original flags] stirlingtools/stirling-pdf:latest

ILovePDF, by contrast, auto-updates with no action required — this is the main genuine operational advantage of the cloud approach. Self-hosting adds ~15 minutes per quarter for update maintenance.

When ILovePDF Still Makes Sense

Stirling PDF requires a server. For individuals who need to process a PDF once a month with no technical setup, ILovePDF (or Smallpdf) is perfectly reasonable — the occasional-use case doesn't justify the operational overhead of self-hosting.

ILovePDF also has mobile apps (iOS/Android) with offline PDF viewing, which Stirling PDF doesn't replicate. If your use case is primarily mobile, ILovePDF Premium at $7/month is fair value.

Who Should Use Stirling PDF

Law firms and legal teams: Document confidentiality is non-negotiable. Uploading client contracts to a cloud service creates liability. Stirling PDF keeps everything in-house, including redaction.

Healthcare providers: HIPAA-adjacent workflows processing patient documents benefit from on-premises processing. No cloud tool is appropriate for PHI without a BAA.

Finance and accounting: Processing financial statements, tax documents, and audit trails on external servers creates unnecessary exposure.

Developers and sysadmins: The REST API enables PDF automation pipelines that would cost significant money via cloud API alternatives.

Homelabbers: Stirling PDF is a perfect homelab service — useful, lightweight, and often replaces three or four browser-based cloud tools.

Verdict

Stirling PDF isn't just a cheaper alternative to ILovePDF — it's a more capable one. With 60+ operations (vs ILovePDF's 25+), a full REST API, offline operation, unlimited file sizes, and zero data leaving your server, it wins on almost every metric for organizations that can deploy Docker.

The one exception: personal, occasional use with no technical setup. For that, ILovePDF's free tier is convenient and sufficient.

For any professional context — especially legal, healthcare, financial, or government — Stirling PDF on a $10/month VPS is the responsible choice and often the only GDPR-compliant one.

Stirling PDF vs ILovePDF Self-Hosted 2026