Adobe Acrobat

Compress PDF files

Your files will be securely handled by Adobe servers and deleted unless you sign in to save them.By using this service, you agree to the Adobe Terms of Use and Privacy Policy.

How to compress a PDF

Follow these easy steps to compress a large PDF file online: | Three documents in decreasing size showing how to compress a PDF

  • Click the Select a file button above or drag and drop files into the drop zone.
  • Select the PDF file you want to make smaller.
  • After uploading, Acrobat will automatically reduce the PDF size.
  • Download your compressed PDF file or sign in to share it.

Try our free PDF compressor tool | A file being reduced in size

Reduce PDF file sizes online

The Adobe Acrobat Compress PDF online tool lets you compress PDF files right from your browser. Use our PDF compressor to make large files smaller and easier to share. | A compressed PDF file that can be easily shared

An easy PDF compressor

Drag and drop or upload a PDF document to let Acrobat complete the file size reduction. You can then work with, share or store the compressed file more easily. | An Acrobat PDF with a measurement bar showing you can choose your compression level

Choose your compression level

If you need the smallest file possible, select High compression level. You can select Medium or Low compression if you want to reduce the file size but maintain a higher file quality. | An arrow representing how easy it is to share a compressed PDF file

Share files online

By compressing files, you make them much easier to share. If you email a file, the smaller size can help you to avoid email file size limits and uploads are faster too. | An Acrobat PDF with a lock demonstrating file security you can trust

File security you can trust

Security is paramount to Adobe. If you don't sign in or save your file, it will be deleted from our servers to respect your privacy. Security measures are also built into every PDF created with Acrobat. | A high-quality compressed PDF file

The best PDF compressor

Adobe invented the PDF format and delivers high-quality online tools. Try our free tool to compress a file in any web browser, including Microsoft Edge or Google Chrome.

Questions? We have answers.

How do I compress a PDF without losing quality?

The Acrobat online PDF compressor balances an optimised file size against the expected quality of images, fonts and other file content. Just drag and drop a PDF into the PDF compression tool above and let Acrobat reduce the size of your PDF files without compromising quality.

For more refined control of optimisation settings, you can try Adobe Acrobat Pro for free for seven days. Acrobat Pro lets you customise PPI settings for colour, grayscale and monochrome image quality. You can also use PDF editor tools, edit scans with OCR functionality, convert PDFs to Microsoft PowerPoint and other file formats, convert PNGs and other image file formats, organise and rotate PDF pages, split PDFs, optimise PDFs and more. You can use Acrobat on any device, including iPhones and on any operating system, including Mac, Windows, Linux, iOS or Android.

What size PDFs can I compress?
The Acrobat online PDF compressor tool can compress a PDF of up to 2 GB.
How do I check my PDF file size?
When you select a PDF to compress, the Acrobat PDF compressor tool will show the file size after uploading the file. It will also show the estimated file size after compression based on if you select the High, Medium or Low compression level. | a text bubble, pencil icon and a stacked PDF icon representing free online Acrobat tools

Use Acrobat tools for free

  • Sign in to try 25+ tools, like convert or compress
  • Add comments, fill in forms and sign PDFs for free
  • Store your files online to access from any device

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