GetResizer
GETRESIZERImage Tools

Compress PDF Online

Compress PDF files quickly online with our free size reducer.

or drag & drop PDF files here

Supports PDF

File Privacy

PDF processing happens locally in your browser; the core tool does not upload your files to our servers.

Smart PDF Compressor

Reduce PDF size when the source contains optimizable images. The amount saved depends on the document.

Fast and Easy

Compress PDF documents quickly with a simple, user-friendly interface.

Batch PDF Compressor

Compress multiple PDF files at once, saving time by reducing files in bulk.

Completely Free

Compress PDF files for free while checking the exported document before replacing your original.

Safe and Secure

Keep sensitive files on your device: the browser performs the core compression locally.

How to Compress PDF Files?

  1. Click the "Select PDF Files" button to choose your PDF files.
  2. The tool will automatically compress PDF files, or you can adjust the compression settings.
  3. Click the "Download" button to save your compressed PDF files.

Batch PDF Compressor

Compress multiple PDF files at once for fast and efficient processing.

Compress multiple PDF documents simultaneously. Our PDF compressor is perfect for anyone who needs fast, efficient compression of multiple PDF files to reduce file size.

What PDF compression changes

PDF files can contain text, vectors, fonts and images. Most savings usually come from resampling embedded photographs. A text-only or already optimized PDF may show little change, while scanned documents can shrink substantially.

Recommended workflow

  1. Keep a backup of the original PDF.
  2. Start with moderate compression and process the file.
  3. Check small text, charts, signatures and photos on several pages.
  4. Compare size and readability before replacing the original.

Settings and file behavior

  • Image downsampling reduces pixel dimensions inside the PDF.
  • Lower image quality saves more space but may create artifacts.
  • Vector lines and live text should remain sharper than scanned text.
  • The ideal setting depends on screen viewing, email limits or printing.

Important limitations

  • Encrypted or damaged PDFs may not be supported.
  • Already optimized files may not become smaller.
  • Complex forms, signatures or uncommon features should be checked in a dedicated PDF viewer.

Practical recommendation

Use moderate compression for email and screen reading. Keep higher quality for contracts, fine diagrams, print jobs and scans where small characters must remain legible.

Written and tested by Andrey Zhurba, creator of GetResizer. Last reviewed October 14, 2026.

Compress PDF Frequently Asked Questions

Are you curious about how our PDF compressor works? Get all clear things up!

How can I compress PDF files while preserving important detail?

The amount of reduction depends on the document. Compare the exported PDF with the original before publishing or replacing it.

Can I compress several PDF files at once?

Yes, our batch compression feature allows you to compress multiple PDF files simultaneously, saving you time and effort.

How to reduce PDF file size?

Click the Select PDF Files button to upload your PDF files. Our tool will automatically compress them, or you can adjust the compression settings manually.

Is the PDF compressor free to use?

Yes, the core PDF compressor is free to use; practical limits depend on the document and browser resources.

What settings are adjustable in the PDF compressor?

You can adjust the compression level to control the balance between file size and document quality.

Is it safe to upload my PDF files?

Absolutely. All files are processed locally in your browser and automatically deleted after compression.