How to Compress a PDF Without Losing Quality
Updated · FlowToPDF Team
Large PDFs slow down email attachments and uploads. Here is how to reduce PDF file size while keeping it readable.
Why PDF Files Get Large
PDFs grow in size because of embedded images, fonts, metadata, and sometimes redundant data from multiple save operations. A single high-resolution image can easily add several megabytes.
Compression Levels Explained
FlowToPDF offers three compression levels:
- Low: Reduces file size slightly. Best for documents where quality is critical — like contracts or legal documents.
- Medium: A balanced trade-off. Recommended for most uses. Reduces file size by 30–60%.
- High: Maximum compression. Images will be noticeably reduced in quality. Good for files shared via chat or email where file size matters most.
Tips for Maximum Compression
- Remove unnecessary pages before compressing.
- If the PDF contains large images, compress those images before creating the PDF.
- Avoid embedding fonts you do not need.
When Not to Compress
Do not heavily compress PDFs that will be printed at high resolution, such as brochures or photography portfolios. Stick to low compression or none at all.