Smart Compress PDF — AI Picks the Best Quality Level

Standard compression applies a fixed quality level regardless of content. AI compression analyses your PDF first — if it is mostly text, it chooses a lighter compression that preserves sharpness; if it is image-heavy, it applies more aggressive image compression while maintaining readability.

The AI selects from four Ghostscript presets: screen (smallest, ~72 DPI images), ebook (balanced, ~150 DPI), printer (high quality, ~300 DPI), or prepress (archival, lossless). The best choice depends on your PDF's content mix and file size.

Yes. After compression, the AI Analysis card shows the detected content type (text-heavy, image-heavy, mixed, or scanned), the quality level it chose, and a brief reasoning explaining the decision.

If Ghostscript cannot reduce the file size further, WhiskFile detects this and shows an 'Already Optimized' message instead of returning a larger file. Your original is never made worse.

For manual control over compression level, use the standard Compress PDF tool which lets you set the quality directly.

Smart Compress PDF is a Pro feature because it uses Claude AI for content analysis. The standard Compress PDF tool is free for all users.

Results depend on content. Image-heavy PDFs often shrink 60-80%. Text-heavy PDFs may shrink 10-30%. The AI picks the right level to maximize reduction while preserving quality. Compression stats show the exact percentage saved.

Yes. The AI detects scanned documents and applies appropriate compression that preserves text readability. Scanned PDFs with large embedded images often see significant size reductions.

Yes. Smart Compress handles large PDFs efficiently. The AI analysis and Ghostscript compression work on any size document. Very large files may take slightly longer to process.

Yes. Your PDF is processed on WhiskFile servers and deleted within 1 hour. Document content is never stored permanently or used to train AI models.

WhiskFile detects this and returns an 'Already Optimized' message instead of giving you a larger file. Your original is never made worse.

Use Smart Compress when you want the AI to pick the best quality level automatically. Use standard Compress PDF when you want manual control over compression level. Smart Compress is best for mixed-content documents where the optimal setting isn't obvious.

The AI considers this. For documents it detects as print-quality (high-resolution images, prepress content), it selects printer or prepress quality levels that preserve 300+ DPI — suitable for professional printing.

Yes. All file transfers use TLS 1.2+ encryption. Files are processed in isolated containers, scanned for malware with ClamAV, and automatically deleted within 1 hour. WhiskFile does not use your files for AI training or share them with third parties.

Yes. Smart Compress PDF works on any device with a modern browser — iPhone, Android, iPad, tablets, Chromebooks, and desktop computers. No app download required. The interface adapts to your screen size automatically.

Smart Compress PDF accepts PDF files as input and produces PDF output. The maximum file size is 50 MB on the free plan (500 MB for Pro users). There are no page count limits.