Compress PDF
Reduce PDF file size while keeping quality.
or drop files here
How to Compress PDF Files Online
Upload your PDF — Click “Select PDF Files” or drag and drop your document. Files up to 100MB are supported.
Choose compression level — Select “Recommended” for a good balance, “Maximum” for the smallest file, or “Low” to preserve the best quality.
Download compressed PDF — Click “Compress PDF” and your reduced file downloads instantly. You'll see exactly how much space you saved.
Why Compress PDFs with PDFWhirl?
✓ Smart Compression — Our algorithm reduces file size while preserving text clarity and image quality.
✓ 3 Compression Levels — Choose between maximum compression, recommended balance, or minimal compression.
✓ Perfect for Email — Reduce large PDFs to fit email attachment limits (25MB for most providers).
✓ No Quality Loss — With recommended settings, compressed PDFs look virtually identical to the originals.
✓ Instant Results — See the original and compressed file sizes side by side after processing.
Frequently Asked Questions
How do I compress a PDF file online?
Upload your PDF to PDFWhirl, select your compression level (recommended, maximum, or low), and click Compress. Your smaller PDF downloads automatically. No signup needed.
How much can I reduce my PDF file size?
Compression results depend on the content. PDFs with images typically reduce by 50-80%. Text-heavy PDFs may reduce by 10-30%. Use 'Maximum' compression for the smallest file size.
Does compressing a PDF reduce quality?
With the 'Recommended' setting, quality loss is minimal and barely noticeable. 'Maximum' compression creates the smallest files but may reduce image quality. 'Low' compression preserves the best quality.
Can I compress a PDF for email?
Yes. Most email providers have a 25MB attachment limit. PDFWhirl can reduce large PDFs to fit within this limit. Use 'Maximum' compression for the best size reduction.
Is PDF compression free?
Yes, PDFWhirl's PDF compressor is completely free with no limits. No signup, no watermarks, and no daily usage caps. Compress as many PDFs as you need.