Reduce PDF size — instantly
Compress any PDF file online for free. Choose your quality level and shrink your file by up to 70% in seconds. No sign-up, no software required.
PdfDocShift › Compress PDF
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Shrink your PDF, keep the quality
PdfDocShift's PDF compressor uses Ghostscript under the hood — the same engine trusted by print professionals worldwide. Upload your PDF, choose a compression level, and download a smaller file in seconds. No watermarks, no quality surprises, no sign-up.
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No sign-up required. Files are encrypted in transit and auto-deleted after 2 hours.
Compress PDF questions
Everything you need to know about compressing PDF files online.
Compression results vary depending on PDF content. PDFs with many images can be reduced by 50–70%. PDFs with mostly text may see 10–30% reduction. Choose Low quality for the smallest file, Medium for a balanced result, or High to preserve maximum quality.
PDF compression primarily works by downsampling embedded images and removing redundant data. Text remains crisp and fully searchable at all compression levels. For best visual quality, choose the High setting — for email attachments, Medium is usually ideal.
The maximum upload size is 50 MB. If your file is larger, try splitting it into smaller parts first, compressing each, then merging them back together using our Merge PDF tool.
Yes. All files are transferred over 256-bit SSL and stored in encrypted cloud storage tied to your anonymous session. No one else can access your files, and they are permanently deleted after 2 hours. We never read or share your documents.