# The Free Adobe Acrobat Alternative

10M+ Downloads
Open Source
Privacy First
Self-Hosted

## What is Stirling PDF?

Stirling PDF is a robust, web-based PDF manipulation tool. It enables you to carry out various operations on PDF files, including splitting, merging, converting, rearranging, adding images, rotating, compressing, and more.

### 50+ PDF Operations

Comprehensive toolkit covering all your PDF needs. From basic operations to advanced processing.

### Workflow Automation

Chain multiple operations together and save them as reusable workflows. Perfect for recurring tasks.

### Multi-Language Support

Available in over 30 languages with community-contributed translations. Accessible to users worldwide.

### Privacy First

Self-hosted solution means your data stays on your infrastructure. You have full control over your documents.

### Open Source

Transparent, community-driven development. Inspect the code, contribute features, and adapt as needed.

### API Access

RESTful API for integration with external tools and scripts. Automate PDF operations programmatically.

## Key Features

### Page Operations

- Merge & split PDFs
- Rearrange pages
- Rotate & crop
- Extract pages
- Multi-page layout

### Security & Signing

- Password protection
- Digital signatures
- Watermarks
- Permission controls
- Redaction tools

### File Conversions

- PDF to/from images
- Office documents
- HTML to PDF
- Markdown to PDF
- PDF to Word/Excel

### Automation

- Multi-step workflows
- Chain PDF operations
- Save recurring tasks
- Batch file processing
- API integration

### Plus Many More

- OCR text recognition
- Compress PDFs
- Add images & stamps
- Detect blank pages
- Extract images
- Edit metadata

- Flatten forms
- PDF/A conversion
- Add page numbers
- Remove pages
- Repair PDFs
- And 40+ more tools