Why PDF Files Get So Large
PDFs become bloated due to high-resolution embedded images, embedded fonts, metadata, and revision history from editing. A 20-page report with photos can easily exceed 100MB.
How PDF Compression Works
Our tool re-renders the PDF structure through FPDI, which removes redundant metadata, optimizes internal object references, and restructures the file — often resulting in 20–40% size reduction, especially for PDFs with complex structures.
How to Compress a PDF Online
1Open the PDF Compressor tool.
2Upload your PDF (up to 50MB).
3Select compression level (Low = better quality, High = smaller file).
4Click Compress and download the optimized PDF.
💡 Best Results: For PDFs heavy with photos, compress images separately first (using our Image Compressor), then convert to PDF again for maximum size reduction.
Email File Size Limits by Provider
- Gmail: 25MB per email attachment
- Outlook: 20MB per email attachment
- Yahoo: 25MB per email attachment
- WhatsApp: 100MB per document
FAQ
How much can I compress a PDF?
Typical results: 20–60% reduction. PDFs that are already well-optimized may see less reduction. PDFs with lots of uncompressed images see the most benefit.
Does compression affect text quality?
No — text is stored as vectors in PDF and is not affected by compression. Only image data may show quality changes at high compression levels.