Compress PDF
Reduce PDF file size with quality presets. Choose between low, medium, and high compression. Free online PDF compressor.
Drag & drop your file here, or click to browse
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How to Compress PDF
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1
Upload your PDF
Drag and drop your PDF or click to browse. Maximum 25MB for free users, 500MB for Pro.
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2
Choose compression level
Select Low (smallest file), Medium (balanced), or High (best quality) compression.
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3
Compress and download
Click "Compress PDF" to reduce the file size. Your compressed PDF downloads automatically.
Frequently Asked Questions
Upload your PDF to ChangeThisFile, select a compression level, and click Compress. The compressed PDF downloads automatically. No signup required.
Compression varies by content. PDFs with images typically compress 50-80%. Text-heavy PDFs may only compress 10-20%. The Low preset gives the smallest file size.
The Medium preset preserves good quality for most uses. The High preset maintains near-original quality. The Low preset prioritizes size over quality — best for screen viewing.
Free users can compress PDFs up to 25MB. Pro users ($9/mo) can compress PDFs up to 500MB.
ChangeThisFile uses Ghostscript to recompress images within the PDF, remove redundant data, and optimize the file structure. Text and vector elements are preserved.
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Reduce PDF file size with quality presets. Choose between low, medium, and high compression. Free online PDF compressor.