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June 27, 2026 · 4 min read
Large PDFs are difficult to email, slow to upload, and take up too much storage space. Compressing a PDF reduces its file size while keeping the content readable. Here's how to do it online for free using PDFTools Compress.
Reduces file size by up to 80%. Best for email attachments and archiving. Images are downscaled for smaller file sizes.
Reduces size by 50-60% while maintaining good visual quality. Recommended for most use cases.
Reduces size by 20-30% with near-original quality. Best for documents that will be printed.
Average results: A 20MB PDF compresses to 3-5MB with balanced mode. A 5MB PDF compresses to 1-2MB.