Key takeaways.
- Adobe offers some of the best tools to help you compress PDF files, with different levels of compression that balance quality and size.
- Compress your PDF to a file size of your choice—from 100 KB to 1 MB— without sacrificing quality.
- Reduce your PDF size online in just a few seconds. Once you’re done, you can share, upload, and store your files with ease.
What is PDF compression?
PDF compression is when you reduce the size of a PDF file. It works by removing non-essential items such as embedded fonts, metadata, or images. Then it optimises your files for efficiency and safety—all without impacting your file’s readability.
You can usually use a PDF Compressor to resize your PDFs. This can make it easier to upload and share your files without the big data requirements, as compressed PDFs take up less space.
Sound complicated? Trust us, it isn’t. Just drag and drop your PDF into Adobe’s free compression tool to get started.
What are the advantages of using PDF compression software?
PDF compression instantly removes redundant data, making it easier to manage your files. Here’s how our best-rated PDF compressor tool can help with your project.
- Improved file sharing. Smaller PDFs are easier to upload to websites, share via cloud, and send via email, effectively bypassing file size limits.
- Enhanced storage. Compressed PDF files take up less space on devices, cloud services, and servers, allowing you to optimise your storage.
- Faster document access. Small, compressed PDF files open, download, and transfer more quickly, improving user experience and productivity.
- Maintained quality. The most efficient PDF compression service can reduce file size while preserving the original quality of text and graphics
How to compress a PDF online
Adobe Acrobat is the fastest PDF compression software. Best of all, it’s free and easy to use online. Simply upload your file, choose a compression level, and then download a compressed, resized PDF. Just follow these simple steps:
- Click on the blue “Select a file” button to bring up your file browser and select the PDF file you want to compress. Then click “Open”. Alternatively, you can drag and drop your PDF file into the dotted drop zone to speed up the selection process.
- When you compress a PDF, it’s not one-size-fits-all. Select your compression level from either “High”, “Medium” or “Low” to suit your needs. The higher the compression, the greater the reduction in file size, but it will take longer. Additionally, images and videos could lose some quality.
- Once you’ve made your decision, click “Compress”. Our compressor tool will automatically reduce the PDF file to the desired size.
- Before you close your browser, you’ll probably want to save and download your newly compressed PDF. From here, you can store your new, smaller file on your PC, or you could sign in and share it with collaborators right from the Adobe site.
What features should I look for in a PDF compressor tool?
The most efficient PDF compression service will have advanced features that can help you to compress PDFs quickly and easily. From online capabilities to device compatibility, here are the common qualities to look out for—and how Adobe can deliver.
Reduce PDF file sizes for free online
With Adobe online tools, you can make light work of all your tasks. Use the compress PDF tool to reduce the size of your PDF files in just a few clicks. Do it directly on your browser, with no installations, subscriptions, or steep learning curves.
Compress PDF files quickly and easily
Upload PDF files and let Adobe online tools do all the work in just a few steps. Compress your PDF files to a smaller file size, making it easier to save in storage, share, and attach to emails.
Finetune your compression quality
Whether you want to compress your PDF to 1 MB or 500 KB, you choose your file size. Different compression levels can affect the image quality. Need a super small PDF file? Select High compression. To retain a higher file quality, choose Medium or Low compression.
Share PDFs with collaborators
Resize your PDF to avoid email file size limits and enjoy faster upload speeds (depending on your internet connection) with smaller files. Adjust the size of your PDF to stay within limits before sharing. Our PDF compression tool makes sharing documents online easier.
Compress PDFs anytime, anywhere
Our PDF compressor tool is cloud-based, allowing you to download, view, and manage your reduced PDFs from anywhere—whether at work or on the go. Open and edit PDFs on your phone, or save them on your iPad, and say goodbye to oversized files and long download times.
Edit sensitive files securely
We value your security above all else. With Adobe online tools, if you don’t save your file, we’ll delete it from our servers to protect your privacy. We also install safety measures into every PDF created using Acrobat. Editing your PDF has never been easier.
The best tool to compress PDF files
Adobe created the PDF file format. That’s why we’re considered the top-rated PDF compressor online. Try our free PDF compression tool and reduce file sizes securely on your browser—including Microsoft Edge and Google Chrome.
GDPR encryption
Protect your data with Adobe. Encryption of data ensures secure data processing when you compress your PDF files. Your file will be securely protected by Adobe and deleted, unless you choose to save it. Your files are safe—start to finish, and in between.
What is the best-rated PDF compressor tool?
With several PDF compressor tools available, it can be difficult to find the best tool to compress PDF files.
Research can help you find the right tool for your needs. The best PDF compression site will be able to provide batch processing, offer adjustable compression levels, and more.
Fortunately, Adobe offers a range of useful features. Our PDF Compressor enables you to compress files with the highest quality, with custom compression options and up to 2GB file support.
Whatever your requirements, our PDF compression tool can turn your large PDFs into compressed files ready to share and upload.
How to choose the best PDF compressor for my needs?
The best PDF compressor will depend on what you’re looking for. However, it should offer a balance between speed, efficiency, quality, and security. Here’s what to look out for when comparing different compressor tools.
- Speed and convenience. Many online PDF compressor tools allow quick, one-time compression without needing to install software.
- Security and privacy. Consider a PDF compressor that offers encryption and data protection features—particularly when handling sensitive files.
- High-quality images. Look for PDF compressors that offer low-to-medium compression options, which preserve images while still reducing file size.
- Advanced features. Some PDF compressor tools allow batch processing, object removal, PDF flattening and more granular edits.
Questions? We have answers.
Adobe is the best online tool to compress PDF files without compromising quality. Choosing a low compression level reduces the file size to approximately 1MB while retaining the highest quality settings. For even smaller files, you can select medium compression to reduce your PDF size further. With ISO/IEC 27001 certification, you can rest assured that your files are handled with security and integrity.
Try a 7-day free trial of Adobe Acrobat Pro to test out the precise optimisation tools.
Some email platforms and file storage systems require documents to be less than 1MB. In this instance, you might need to compress your files.
Here’s how to compress a PDF to 1MB or lower for free:
- Go to the Adobe Compressor above.
- Choose the PDF you want to compress, then Select your file or Drag and Drop it into the drop zone.
- Choose your level of compression, then select Compress to reduce the PDF file size to under 1MB.
- Once that’s done, simply Download your compressed PDF from the webpage.
To compress a PDF to 100KB, use the Acrobat PDF compressor online tool or reduce the file size in Acrobat itself. For the second option, open the app, click ‘Optimise PDF’ in the Tools bar and choose the file you want to compress. Then, simply click ‘Reduce file size’, then select the size and version quality you want.
You can follow the same process to compress a PDF to 500KB.
It’s quick and easy to compress and reduce a PDF file size on a Mac. Just look at the step-by-step instructions below:
- Open the Preview app. This is Apple’s default image and PDF viewer, so you’ll already have this installed.
- Once you’re in, open up your PDF.
- Click File, then choose Export. Make sure not to press Export as PDF.
- Select the Quartz Filter menu, which should pop up on your screen.
- Finally, click Reduce file size. You’re all set.
Online PDF compressor tools are most suitable for quick, one-off tasks. They’re available across most devices and are easy to use. However, they can’t function without a stable internet connection, and there may be a limit to the file size you can compress.
In contrast, offline PDF compressor software can handle very large or numerous files without restrictions. Files are also downloaded to your device, which offers better security. This also takes up storage space, and you’re limited to using that device.
Some of the most common issues of PDF compression tools include:
- Loss of image quality.
- Failure to reduce file size
- File corruption and data loss.
- Slow processing times.
- File size restrictions.
To avoid any mishaps, always keep a copy of the original PDF file before compression.
Yes, there’s a significant difference between lossless and lossy PDF compression. Lossless compression reduces file size without removing any data, while lossy compression permanently deletes redundant data to achieve smaller file sizes.
Discover more about lossy vs lossless compression and when to use them.
Yes, you can compress PDF files with Microsoft Word using the following steps:
- Open Microsoft Word, click File > Open, and choose your PDF file.
- Word will convert the PDF into an editable document. Formatting may change here.
- Click File > Export (or Save As on Mac) > Create PDF/XPS.
- Select the Minimum size (publishing online) option.
- Name the PDF, then click Publish to save the newly compressed file to your computer.
The best settings for PDF compression depend on whether you’re prioritising image quality, file size reduction, or a bit of both. Here are the recommended options based on your needs and preferences.
- High compression. High compression drastically lowers image resolution. This is most suitable for text-heavy documents where image quality isn’t as important.
- Medium compression. Offers a balance of reduction and quality. This keeps text sharp and images clear while moderately compressing the file.
- Low compression. Choose low compression for minimal image compression. This reduces the PDF file size slightly while maintaining image quality for printing.
Compress PDF resources
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
Create a free account | Create free account Adobe Acrobat Sign in
