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Compress PDF Free

Reduce PDF file size without losing readability. Choose your compression level and download in seconds — no signup, no server upload.

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How to compress a PDF without losing quality

TidyPDF's compressor re-renders each page at a controlled resolution and JPEG quality level, then rebuilds a fresh PDF. At Low compression, the visual difference is nearly imperceptible. Medium is recommended for most use cases — emailing, sharing, uploading. High compression is best when file size is critical and minor softening is acceptable. Unlike server-based tools, everything happens in your browser so your documents stay completely private.

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FAQ

Compressing PDFs — common questions

How do I compress a PDF without losing quality?
Select Low compression. This reduces file size by 10–30% with nearly imperceptible quality change — perfect for documents where clarity matters.
How much can I reduce the file size?
Image-heavy PDFs can be reduced by 50–80%. Text-heavy PDFs compress less, typically 10–30%. The result depends on the original PDF's content and existing compression.
Which compression level should I choose?
Medium is recommended for most use cases — good balance of size and quality. Use Low for print-quality documents, High when you need the smallest possible file size.
Will compressed PDFs have watermarks?
Never. TidyPDF adds no watermarks to any compressed PDF, regardless of file size or usage.