PDFOptim is a focused, high-performance PDF compressor that does one thing exceptionally well — makes your PDFs smaller without sacrificing quality. Operating natively and completely offline on your Mac, iPhone, iPad or Windows, every document stays private and never leaves your device.
Screenshots
Key Features
Intelligent Auto Compression
Analyses internal file structures instantly with four smart predefined algorithms — automatically generating the smallest possible PDF while retaining pristine text readability and image quality. No configuration needed.
Side-by-Side Quality Preview
A real-time synchronized comparison pane locks scrolling and magnification simultaneously — showing exactly how much space you're saving, down to the percentage point, before you commit.
Granular Manual Compression
Fine-tune JPEG quality, downsample image resolution, apply specific colour space profiles, and strip hidden metadata bloat — full control over the compression engine for advanced users.
Native Batch Processing
Leverage multiple CPU cores simultaneously to compress entire folders of PDFs at lightning speed. Load queues instantly with drag-and-drop and process hundreds of files hands-free.
Scanned Document Optimisation
Maximize savings on heavy scanned paperwork using Grayscale, Monochrome, and Bitonal colour profile conversions — producing files up to 40× smaller with crisp, readable text.
Vector Graphics Optimisation
Five-level vector optimisation strips superfluous anchor paths and structural data from drawing, note-taking, and markup app PDFs — the file types that traditional compressors can't touch.
Apple Shortcuts Automation
Turn PDFOptim into a Finder Quick Action — trigger instant background compression cycles directly from a file's right-click context menu, without ever opening the app.
Metadata & Structural Stripping
Safely purge hidden overhead — alternate images, embedded thumbnails, document structure hierarchies, and output intents — to squeeze out every last byte of storage savings.
Private & Fully On-Device
All compression runs natively on your Mac, iPhone, iPad or Windows. Your documents are never uploaded to any server — fast, secure, and completely offline.
System Requirements
macOS
- Version
- macOS 12 or later
iOS
- Version
- iOS 15.6 or later
Windows
- Version
- Windows 10 or later
The Word on the Street
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