Social Videos.Online — homeSocial Videos

Free · In your browser · Files stay on your device

Compress PDF Online Free

Reduce your PDF file size using Ghostscript + qpdf compression. Choose from four compression levels — your files are deleted immediately after processing.

Document tool

PDF

Drop a PDF here or click to browse

PDF files up to 100 MB

Powered by Ghostscript + qpdf. Your file is compressed on our server and deleted immediately after download. We never store your documents.

How to Compress a PDF

  1. Upload: Drag and drop your PDF or click the file picker to select a file.
  2. Choose compression level: Select Low (High Quality), Medium (Recommended), High (Smaller), or Ultra (Maximum).
  3. Compress & download: Click Compress, then download your optimized PDF. The file auto-downloads when compression completes.

Compression Levels Explained

Low Compression — High Quality /printer

Maximum image fidelity. Best for print-ready documents, professional layouts, and archival purposes. Produces the largest compressed file but maintains near-original quality.

Medium Compression — Recommended /ebook

The best balance between file size and visual quality. Ideal for most use cases including email attachments, web sharing, and everyday documents.

High Compression — Smaller /screen + aggressive

Uses the /screen preset plus forced image downsampling to 100 DPI, duplicate image detection, and JPEG recompression. Significantly smaller than Medium with moderate quality trade-offs.

Ultra Compression — Maximum /screen + ultra aggressive + qpdf

The most aggressive compression available. Forces images to 72 DPI, strips metadata and annotations, removes unused objects, and runs qpdf post-processing for additional stream optimization. Produces the smallest possible file size with the most quality trade-offs.

Why Use Our PDF Compressor?

  • Ghostscript + qpdf: Industry-standard PDF compression engine combined with qpdf stream optimization.
  • Four Quality Levels: From high-fidelity print quality to ultra-aggressive maximum compression.
  • Secure: Files are deleted immediately after compression. We never store your documents.
  • Fast: Server-side compression is faster and more reliable than browser-based alternatives.
  • Free: No registration, no file limits, no hidden costs.

Frequently Asked Questions

Will compression reduce the quality of my PDF?
It depends on the level you choose. Low Compression maintains near-original quality. Medium reduces image resolution slightly. High downsamples images to 100 DPI with duplicate detection. Ultra downsamples to 72 DPI, recompresses to JPEG, and strips metadata for maximum size reduction.
What is the difference between High and Ultra compression?
High Compression uses aggressive image downsampling (100 DPI) with duplicate image detection and JPEG recompression. Ultra goes further: forces images to 72 DPI, strips all metadata and annotations, removes unused objects, and runs qpdf post-processing for additional stream optimization. Ultra achieves 20-40% smaller files than High, but with more visible quality loss on images.
Can I compress password-protected PDFs?
Password-protected PDFs may fail to compress because Ghostscript cannot process encrypted files without the password. Remove the password first, then upload the unprotected file.
Does it work on mobile devices?
Yes. The compressor works on iOS, Android, and tablets through any modern browser — no app installation needed.
What happens to my uploaded file?
Your file is compressed temporarily on our server and deleted immediately after you download the result. We never store, share, or access your documents beyond the compression process.
What is the maximum file size?
You can upload PDF files up to 100 MB. Larger files may take longer to compress depending on server load and the complexity of the document.

Document tools