Compress PDF Online — Free, No Upload Needed

Private by design — runs fully in your browser with pdf.js and pdf-lib. Preview pages, pick quality, and download the smaller PDF.

Upload or Drop your PDF

Drag & drop your PDF here or click to upload
Original Size: N/A

Compression Settings

Higher compression downscales page images more aggressively.
80%
Primarily affects newly rasterised page images.
Compressed Size: N/A
Reduction: N/A

Preview

Page 1 of 1

Tip: Large, image-heavy PDFs compress more when using High compression with lower image quality.

How to Use:

Drag and drop your PDF file into the area below, or click to upload. Preview your PDF, then select your desired compression level. Our tool will then compress the PDF directly in your browser, ensuring your document's privacy. Once compressed, download the smaller PDF.

Tips to Meet File Size Limits

  • Email: keep attachments under ~25 MB.
  • Online forms/portals: common limits are 5–10 MB.
  • Use High compression and lower image quality for image-heavy PDFs.

How it Works (Client-Side Compression):

This tool uses JavaScript libraries (pdf-lib and pdf.js) to process your PDF file directly within your web browser. This means your PDF never leaves your computer, ensuring maximum privacy and security. Compression is primarily achieved by optimizing images, fonts, and the PDF's internal structure.

*Note on Compression Effectiveness: While this tool performs structural optimizations, significant file size reduction for PDFs with many images often requires advanced image re-encoding (downsampling, lower quality JPEG) which is beyond the scope of simple PDF library operations and may not be fully reflected by the 'Image Quality' slider alone for existing images.

Explore more tools