Compress PDFs online fast and free

A smart cloud solution for easily reducing PDF files’ size while retaining quality
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Characteristics

File extension .pdf
Internet media type application/pdf
Description: PDF is the Portable Document Format developed by Adobe Systems. It was invented to streamline the process of sharing and viewing files independent of any software, OS or hardware. Individuals can use PDFs wherever and whenever they want on any device. PDF files can contain textual and visual data as well as links, buttons and more. PDFs can be also password protected and edited with special programs.
Technical Details: Graphics are represented in PDF very similarly to that of PostScript. PDF graphics use a device-independent Cartesian coordinate system which describes the surface of a page. The page description uses a matrix to scale, rotate, or skew graphical elements. The graphics state is a collection of graphical parameters that may be changed, saved, and restored by a page description.
Developed by ISO
Initial Release: 15 June 1993
Useful links: https://acrobat.adobe.com/us/en/acrobat/about-adobe-pdf.html
https://fileinfo.com/extension/pdf

How-to guide

How to compress a PDF online for free

The How to Guide

How to Reduce the Size of the File and Preserve the Quality

  1. Get to altocompress.com by typing it in your search bar or the web address bar in your browser.
  2. Use one of the following ways to import the necessary document to the converter: drag and drop it, upload it from your gadget or upload it from one of the pre-approved cloud solutions.
  3. In case you uploaded the wrong file, click on the bucket icon to delete it.
  4. Hit the Compress Now! button.
  5. Wait a few seconds for the file to be resized.
  6. Save the compressed file using the Download Now button.
  7. Repeat the compression using the Start over again function.
  8. In order to go to PDFfiller’s editor and redact and share your document, click Work on your PDF.

The Ultimate Features Comparison Chart

With so many tools on the market, it’s hard to choose the right one. Most of them seem similar until you look deeper. Use our comparison table to compare the market leaders in PDF management. Find out why choosing AltoPDF is a smart decision not only for reducing file size but for many other actions as well.

SmallpdfAdobe
Split PDF βœ” βœ” βœ”
Merge PDF βœ” βœ” βœ”
Combine & Reorder βœ” ❌ ❌
Extract Pages βœ” ❌ ❌
Compress PDF βœ” βœ” ❌
Rotate PDF βœ” βœ” ❌
No software downloads βœ” βœ” ❌
Cloud storage Unlimited No info No info
Price Free Free 7-Day Trial paid Free 7-Day Trial paid
Encryption and security βœ” βœ” βœ”
Support 24/7/365 No info βœ”
No ads βœ” βœ” βœ”

Customer Reviews β€” Trusted by great people

Stacy

02/28/2020

Excellent solution! If the size of your PDF document is too big, reduce it with just a few clicks. It solves the memory shortage problem. Plus it’s so quick!

Lee

01/24/2020

What I like best about the AltoPDF tool is that no registration is required. Creating an account is one of those things that makes me wanna leave the website.

Dave

01/17/2020

That’s awesome! I can compress my PDF files from any device, even when I’m in a taxi or on a buss, or walking on the street. It take up memory cause no installations are needed.

Your opinion matters!

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How To Compress a PDF File

File compression will become a smooth and streamlined process with our platform. Employ the tool and ensure a high quality of the result.

How to Compress PDF Files Online

This website was created so you could compress files quickly and easily. Its ease of use and compression speed makes it one of the top solutions for decreasing file formats online. The best thing is the quality of images and text included in the document will always remain the same. The solution doesn’t take up any memory on your device and it never needs to access your personal information. This website is cross-platform and is available from any internet-connected device. 

Here’s how you can easily compress the file size online:

  1. Open the web-based service. Browse for a file in your device’s internal storage or in the cloud. Import it to AltoCompressPDF.
  2. Once the template is available, compress it.
  3. Save the document with the newly-deceased file size to your storage.
  4. Repeat this operation for as many files as you need.

Usage of an online platform saves you time, money and space. And the location of all of the tools in the cloud eliminates the need for installation. We offer the highest security measures and the possibility to compress the size of as many documents as you need. The platform has a lot of additional online options available for free use. You can reduce files without any payments, registrations or trial periods. For those who want to use this tool on the go, a lite mobile app is available.

 

BackgroundHow to Compress PDF Files Online

How to Compress PDF With Chrome Extension

Google Chrome is one of the most frequently used browsers. It’s compatible with numerous extensions and online-based services for compressing PDF files. It’s preferable to install the browser extension. Those who work with documents often should add Alto Compress extension to your browser. 

With it any large-sized PDF will be easily decreased without breaking file formatting or losing quality. The service perfectly integrates in Chrome. 

Here are step-by-step instructions on how to compress PDF files with Alto PDF:

  1. First, visit the extension store and find a solution via inserting its name in the search field.
  2. Open the extension and add it to Chrome. It will install and appear at the upper left corner.
  3. Click at the Alto Compress icon and the pop-up window will appear. 
  4. Select the template for compression from your computer or cloud Drive. 
  5. Wait until the operation finishes and the final file with decreased size will be available. Click at the compressing option and the template’s size will be decreased.
  6. Download the final sample version to the internal or cloud storage. 

Usage of Google Chrome Alto Extension on any device, no matter whether you install it to the mobile or desktop, gives you an advantage. All internet-based services have numerous features but do not take up the memory of the user’s device. Thanks to that, with this browser everyone gets the opportunity to decrease the size of a large PDF file free of charge. Additionally, the image quality will never be damaged.

BackgroundHow to Compress PDF With Chrome Extension

How to Compress PDF Files in Windows

Windows users often use PDFs. In fact, it is one of the most popular formats out there. So undoubtedly, it’s vital to understand how to make basic operations with PDFs. Some users prefer installing additional software to their computers or they also can process documents via online services. You can choose the one you prefer —  a free or paid solution, as well as an application or online website with a cloud-based toolkit. 

Let’s take a look at how one can complete this operation in Windows:

  1. Open the solution for compression. 
  2. Browse for a file in your device’s internal storage or cloud.
  3. Import the file and once it’s ready, complete the conversion.
  4. Save the final template with the decreased size to your preferred storage.

Unfortunately, Windows does not have pre-installed solutions for editing, converting or reducing the size of PDF samples. There are a wide variety of applications that combine multiple features in one. Still, there are also apps that only concentrate on specialized features. For example, it can be the conversion, the signing of a document or extracting its pages. Most of them are free and available from any Internet-connected device via a browser. Those apps are good for those who have no time for installation and making payments. 

BackgroundHow to Compress PDF Files in Windows

How to Compress PDF Files With Preview on Mac

The popularity of PDFs among Mac users is constantly growing. That is why Mac OS developers added some features for processing those files without additional software. Viewing content in PDF is quite simple when you use the default “Pages” application. Also, it’s possible to decrease a PDF’s size on Mac. And compressing the size is simple for Mac users as well. Let’s take a closer look at how this feature works. Here is the step-by-step instruction:

  1. Open the file for a preview. 
  2. Select the File option and click on Export.
  3. A new window will appear. Click on Quartz Filter and select the Reduce File Size option from the list to compress a file.
  4. Specify the location of the future template and save it. 

Mac default applications can effectively reduce the size of PDFs without losing the quality of images. This feature is very helpful for those who need to work with these files on a regular basis. For example, for designers or marketing executives, PDF templates with pictures, spreadsheets, countings, and textual data are primarily used. As a result, it becomes easier to process files and share them between different users. 

BackgroundHow to Compress PDF Files With Preview on Mac

How to Compress PDF Files Online

This website was created so you could compress files quickly and easily. Its ease of use and compression speed makes it one of the top solutions for decreasing file formats online. The best thing is the quality of images and text included in the document will always remain the same. The solution doesn’t take up any memory on your device and it never needs to access your personal information. This website is cross-platform and is available from any internet-connected device. 

Here’s how you can easily compress the file size online:

  1. Open the web-based service. Browse for a file in your device’s internal storage or in the cloud. Import it to AltoCompressPDF.
  2. Once the template is available, compress it.
  3. Save the document with the newly-deceased file size to your storage.
  4. Repeat this operation for as many files as you need.

Usage of an online platform saves you time, money and space. And the location of all of the tools in the cloud eliminates the need for installation. We offer the highest security measures and the possibility to compress the size of as many documents as you need. The platform has a lot of additional online options available for free use. You can reduce files without any payments, registrations or trial periods. For those who want to use this tool on the go, a lite mobile app is available.

BackgroundHow to Compress PDF Files Online

FAQ

Use altopdf.com to downsize files on mac or any other platform, as it’s browser-based and is optimized for use across other platforms too. First, make sure that you are online and then load your doc. Then click on the orange icon to downsize and save it. You can also choose to download it, share or forward to GoogleDrive.