Compressing a PDF is free and you can do it online without having to install any application on your computer or mobile phone, we explain some of the best websites where you can do it. The operation is almost always the same: you upload the file with the original weight and you can download it again reduced. It is similar to when you reduce the weight of a photograph to upload it to the Internet, for example. We explain how to compress a PDF from different web pages or how directly export a Word file in a lightweight size.

What is compressing a PDF?

What we get is to reduce the weight of the file and that we can send it by email or store it taking up less space. No information will be lost, but we will reduce what the PDF occupies or weighs. Of course, the quality level could drop if we bet on extreme compression so that it occupies very little. Although they usually follow being perfectly legible and normally you will only see that slight loss of quality in the images and graphics that you have but not in text.

Advantages and disadvantages of compressing

There are many advantages of compressing a PDF using any of the tools that we will leave you next. The main advantage is that it is simpler handle small files and not only handle them but store them. For example, if you want to always have it at hand and you need to carry it in the internal memory of your mobile phone, it would be better to use less. Or if you need to print it or carry it on a pendrive or USB memory, it will be better if they occupy less all the files and compressing a PDF or all the ones it carries will allow you to optimize space. You will also get better transfer speed. It is also useful if we want to send it as an attachment in an email because if it weighs too much they will not allow us to add it but we will have to upload it to the cloud. If it weighs little, it will be easier to attach, save, send, share. It is much more recommended.

The main drawback of using these web pages to compress a PDF is that we do not recommend that you do so with confidential files. Most of them promise and indicate that the web deletes the files after a time, an hour or a day, but even so, we recommend that you do not share “secret” files on these websites if you do not first read the conditions of use of the same.

Compress from Word

One of the ways we can compress a PDF is when we save the file from Word. That is, when saving it you can choose to take up little space if you are going to do it from Word. That is, you have a text document in Word that you want to save as a PDF that occupies little and is manageable … In that case, you can export it as such and you will get have a minimum weight. Ideal to send by email or to upload to a web page. You should not do it from the “Save as” button of the program but from another. Follow these steps:

From the document, tap on File You will see a blue bar on the left side of the screen Choose “Export” Tap on “Create a PDF / XPS document”

Export PDF

At the bottom, look for “Optimize …” You will see two options Standard (online publication and print) Minimum size (online publication) Choose the second option Tap on “Publish”

Optimize and compress a PDF

You will save the document with an optimal weight to share, send by email, save on a pendrive or on your mobile phone, etc. This will reduce the size if you do not need the quality to be optimal.

Adobe allows you to compress a PDF totally free from its website without having to download anything. Allows you to use the tool from the browser to share them more easily or if you have very large files. You just have to drag or drop it from the Adobe PDF compressor and wait a few seconds for it to compress. The process is fast and very intuitive and you can download it on the device you want, share the link or log in to save it in the cloud and have access from wherever you want.

From Adobe’s own website you also have a series of free tools to use with this type of format: you can convert any file to PDF like PPT, Word or Excel, for example. You can also convert from PDF to JPG, fill or sign a document or request signatures for it. It is useful, free and recommended. Also, it removes files from the servers instantly, so you don’t have to worry about your privacy or that the document reaches someone else’s hands.


ILovePDF is one of the most recommended websites to compress a PDF online without having to download any type of software on your mobile phone or on your computer. It’s free and it’s Google compatible Drive and Dropbox. In addition, it not only allows you to compress PDF but it has all kinds of tools for documents in this format: you can unite them, divide them, convert them to another format or use other formats (such as .doc or jpeg) to convert them to PDF. Whatever you need, on this website we generally find the tools available.

To compress a PDF, simply select the file you want from your computer through the big red button that you will find on the web page. Once you have it, you will see that it allows youe choose the compression level: extreme, recommended or low. It will depend on the option you choose that you will have more or less quality. The quality will be inversely proportional to the compression you decide. Once you have it, just click on the red button “Compress PDF” and wait a few seconds for the process to complete. When it’s ready, it will automatically download or you can download it, send it to Dropbox or Google Drive, or share it with someone through an available link. Another of the information that you will see on the screen is in how much has been reduced: You will see how much it weighed and how much it weighs now and what is the percentage of weight reduction that has been made in the document.


As in the previous one, SmallPDF also allows to compress pDF in addition to other actions such as converting, merging, editing or signing. You can use it for free and one of the things it ensures is that the documents are deleted from the servers after an hour, so the files you upload will not be at risk. It is available through any browser regardless of your operating system and you can upload files up to 5GB to reduce them.

The operation is similar to the rest: you choose or drag the PDF document and choose the option you want if basic or large compression. Generally, the large compression option is limited for PRO users using the paid version. Choose the option, wait a few seconds and it will have been converted. You will also see how much, in percentage, the PDF has been compressed: You will also see the final weight. You can download it, email it, get a link, or convert it to JPG. Keep in mind that SmallPDF is free but you can only compress PDFs twice a day if you use the limited version.


As its name suggests, you can compress PDF files to publish them on the Internet, to carry them on the internal memory or USB, to share on social networks or to send by email. This tool promises not to change the resolution of the images that appear in the files and you can upload several at the same time and download them in ZIP in case you have several related documents.

You can drag the files or upload them and you can automatically download them with the button or download them at the same time. In each of them you will see a miniature with the compression percentage that has been made of it. Beyond compressing, like most of the websites on this list, it allows you to convert to DOC or DOCs, to PNG or JPG or to combine several PDFs in one. It is free and very practical thanks to the fact that it allows you to do them in bulk without having to download them one by one.

Compress PDF with PDFCompressor

Like the previous ones, PDF Converter is a web page with all kinds of tools that allow you to edit, merge, divide, compress, rotate … You can select a PDF file and drag it to the web page to compress it. Once it is ready, you will see how much has been reduced and the total KB before and after the process. Similar to the previous ones you can download it, save it in Google Drive, save it in Dropbox or delete it. It also has a Premium version that allows the size of the document to be unlimited or that you can convert several documents in a single time but generally you will not need so many options if you make occasional use of these tools.

Compress PDF with PDFConverter