PDF Compressor
Compress PDF Online — Reduce File Size Free
Reduce PDF file size for email, uploads, and storage. Works in your browser — private and instant.
PDF Compressor
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How PDF Compression Works
PDF compression typically works by reducing image resolution, removing redundant data, and applying lossless compression to streams. Our browser tool uses PDF-lib to re-save the PDF with optimized settings. The actual compression ratio depends heavily on the original file's content — image-heavy PDFs compress much more than text-only files.
For the best results on very large PDFs with many embedded images, try the "Maximum Compression" setting. For documents you want to remain crisp and printable, use "High Quality".