Compress PDF
Drag & drop your PDF here
PDF only
Optimize your PDF for email, upload, or storage. Instant, private, free.
Drag & drop your PDF here
PDF only
Large PDF files cause problems everywhere: email attachments that bounce, slow upload times on portals, and storage quotas filling up. Compressing a PDF before sharing is a simple step that can make a significant difference — especially for documents that contain embedded fonts, redundant objects, or unoptimized internal structure.
OneClickPDF uses pikepdf (a Python library wrapping QPDF) to apply lossless stream compression and object deduplication. The visual output of your PDF is identical to the original — only the internal storage structure is optimized.
PDF compression works best on files that were not optimized when created — for example, PDFs exported from legacy software, PDFs created by print-to-PDF drivers, or documents that have been edited and re-saved multiple times without cleaning up redundant data.
Note: PDFs already heavily compressed (e.g., scanned images at high DPI with existing JPEG compression) may see minimal reduction without image downsampling, which is not applied to preserve quality.
Results vary by PDF content. Text-heavy, font-embedded PDFs often see 10–40% reduction. PDFs already highly compressed or composed mainly of JPEG images may see smaller gains since lossy image recompression is not applied.
No. This tool uses lossless compression — it compresses internal data streams and removes redundant objects without touching image pixels or text rendering. Your PDF will look identical to the original.
No. Files are processed entirely in memory and deleted immediately after the compressed PDF is delivered to your browser. Nothing is ever stored on our servers.
Password-protected PDFs cannot be processed. Remove the password using Adobe Acrobat, Preview (macOS), or your PDF reader before uploading.
The maximum upload size is 10 MB. Ironically, if your PDF is larger than 10 MB, split it first using our Split PDF tool, compress the parts, then merge them back.