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PDF Compressor

Compress PDF files to reduce size. Optimize PDFs for sharing.

Drag & drop a PDF file here

or click to browse

or import from

How to Use PDF Compressor

1

Upload your PDF

Drag and drop or click to upload the PDF file you want to compress. There is no file size limit.

2

Adjust compression level

Use the quality slider to set your desired compression. Lower quality means smaller files, higher quality preserves more detail.

3

Compress and download

Click Compress to process your PDF. View the before and after file sizes, then download the compressed PDF.

About PDF Compressor

Compress PDF files online for free with our PDF Compressor. Reduce PDF file size by up to 80% without significant quality loss. Adjustable compression settings let you find the perfect balance between file size and document quality. Ideal for shrinking email attachments under size limits, optimizing PDFs for web uploads, reducing storage usage, and sharing large documents. Works especially well on PDFs with embedded images and scanned pages. No Adobe Acrobat needed — everything processes locally in your browser.

Key Features

  • Reduce PDF file size by up to 80% while maintaining readable quality
  • Adjustable compression quality slider for precise control over size vs. quality
  • Preview file size before and after compression to see exact savings
  • Compress PDFs with images, scans, and graphics for maximum size reduction
  • Free to use with no signup, no watermarks, and no file size limits
  • 100% private — all compression happens in your browser, PDFs are never uploaded to any server

Frequently Asked Questions

How to compress PDF files online for free?▾
Upload your PDF to our free PDF Compressor, adjust the compression level if needed, and download the smaller file. No signup, no watermarks, no limits — completely free.
How to reduce PDF size for email?▾
Upload your PDF and our compressor will reduce the file size to fit within email attachment limits (typically 25MB). PDFs with images can be reduced by 50-80%.
What is the best free PDF compressor?▾
Anykast PDF Compressor reduces PDF file sizes for free with adjustable quality settings, no watermarks, and complete browser-based privacy. No software installation required.
Can I compress PDF without Adobe Acrobat?▾
Yes! Our online PDF Compressor is a free alternative to Adobe Acrobat for PDF compression. Upload your PDF and compress it directly in your browser without any software.
How much can a PDF be compressed?▾
Compression varies by content. PDFs with images and scans can often be reduced by 50-80%. Text-heavy PDFs with few images may see 10-30% reduction.
Will compressing a PDF affect text quality?▾
Text remains sharp and readable at all compression levels. Only embedded images may see slight quality reduction depending on the compression setting chosen.
Are my PDF files safe when compressing online?▾
Yes. All compression happens entirely in your browser. Your PDF files are never uploaded to any server, ensuring complete privacy for sensitive documents.
How to compress PDF without losing quality?▾
Use a higher quality setting on the compression slider for near-lossless compression. This typically reduces file size by 20-40% while maintaining excellent visual quality.