Compress PDF

Compress PDF Online — Reduce PDF File Size Free

Large PDF files can be a challenge to share by email, upload to websites, or store efficiently. Our free online PDF compressor reduces file size significantly while keeping your document readable and professional.

Why Compress PDF Files?

• Email attachments: Most email providers have a 10–25 MB attachment limit. Compress large PDFs to fit within these limits.
• Website uploads: Many online platforms restrict file upload sizes. Compressed PDFs upload faster.
• Storage savings: Reduce storage used on your hard drive, cloud storage, or document management system.
• Faster loading: Compressed PDFs load faster in browsers and PDF readers.
• Sharing: Smaller files are easier and faster to share via messaging apps or cloud links.

How PDF Compression Works

Our compressor uses Ghostscript, a professional-grade PDF processing engine, to optimize your PDF. The compression process includes:

• Image downsampling: High-resolution images are resampled to screen or print resolution.
• Font optimization: Embedded fonts are subsetted to include only characters used in the document.
• Stream compression: PDF internal data streams are compressed using lossless algorithms.
• Metadata removal: Unnecessary metadata and comments are stripped.

Compression Levels

• Screen (72 DPI): Maximum compression, best for on-screen reading and web sharing.
• eBook (150 DPI): Good balance of quality and compression, ideal for digital distribution.
• Printer (300 DPI): High quality for printing, moderate compression.
• Prepress (300 DPI+): Minimal compression, preserves maximum quality.

Tips for Best Results

• PDFs with many high-resolution photos achieve the greatest size reduction.
• Text-only PDFs may see minimal reduction since text compresses efficiently.
• Try different compression levels to find the best quality/size balance for your needs.