10 Best Free Online PDF Compressor Websites

Here is list of best free online PDF compressor websites. PDF compression is a process of reducing the size of PDF documents. At times it is important to compress PDF files especially if you have a lot of them. To compress PDF files, users generally use PDF editing software and apps that are slightly complex to use. To avoid this problem, users can try these online PDF compressor websites which are quite simple to use.

Using most of these websites, users can compress multiple PDF documents at a time. Plus, they also let users choose a PDF compression level (Low Compression, Medium Compression, and High Compression). The Low compression method slightly reduces the size of PDF files and retains good PDF quality. On the other hand, the High Compression method significantly reduces the PDF document size but also deteriorates the PDF quality. After specifying a compression level or method, users can start the compression process. To help out novice users, I have also included the necessary steps to compress PDF files in the description of each website.

These websites also come with many additional tools that may come in handy. Using additional tools, users can Edit, Convert, Merge, Split, Sign, and Annotate PDF files. Go through the list to know more about these websites.

My Favorite Online PDF Compressor Website:

tools.pdf24.org is my favorite website as it can compress multiple PDF documents at a time. Plus, it also allows users to manually adjust the DPI, Image Quality, and Background Color parameters of PDF files.

You can also check out lists of best free Online PDF Page Rotator, Online PDF Page Remover, and Online PDF to Image Converter websites.

tools.pdf24.org

tools.pdf24.org is a free online PDF compressor website. This website can also be used as a PDF manipulation website as it offers various PDF manipulation and conversion tools. To perform the PDF document compression, it offers a Compress PDF tool. This tool can compress multiple PDF files at a time. It even allows users to adjust the DPI, Image Quality, and Background Color of PDF documents before starting the conversion process. After performing the conversion, users can save the output PDF documents to their cloud storage (Dropbox and Google Drive) and local storage with ease. Now, follow the below steps to compress PDF documents online using this website.

How to compress PDF online using tools.pdf24.org:

Visit this website and access the Compress PDF tool.
After that, drag and drop one or more PDF files on its interface that you want to compress.
Next, specify the DPI, Image Quality, and Background Color parameters.
Lastly, click on the Compress button to initiate the batch PDF compression process.

Additional Features:

Protect: It is a handy tool through which users can password-protect output PDF files.
PDF Manipulation Tools: Using PDF manipulation tools, users can merge PDF files, rotate PDF Pages, Sign PDF Files, Sort PDF Pages, and more.

Final Thoughts:

It is one of the best free online PDF compressor websites as it can easily batch compress multiple PDF documents at a time.

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pdf.online

pdf.online is another free online PDF compressor website. Using this website, users can compress both locally stored and cloud-stored PDF files. It also lets users load multiple PDF documents together to perform batch PDF compression. Before performing the compression process, users can preview PDF document content using the Preview tool. Three compression levels namely Low, Mid, and High are also provided by it. Users can choose one of the compression levels according to their requirements. Now, follow the below steps to compress PDF documents.

How to compress PDF online using pdf.online:

Go to this website and access the compress PDF tool.
After that, load one or more PDF files.
Next, choose a compression level from three available ones.
Lastly, hit the Compress button to initiate the PDF compression process.

Additional Features:

Convert: Using conversion tools, users can convert PDF documents to other files and document formats like Excel, Word, HTML, etc.
Edit: It offers PDF editing tools like annotate PDF, redact PDF, crop PDF, etc.

Final Thoughts:

It is another good online PDF compressor website that offers all the essential tools to batch compress PDF documents.

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ilovepdf.com

ilovepdf.com is a free online PDF compressor website. Using this website, users can compress multiple PDF documents at a time. To compress PDF documents, this website offers three options namely Extreme Compression (less quality, highest compression), Recommended Compression (medium quality, medium compression), and Less Compression (high quality, less compression). Now, follow the below steps to compress PDF files online using this website.

How to compress PDF files online using ilovepdf.com:

Go to this website and choose the Compress PDF tool.
After that, load one or more PD files that you want to compress.
Next, choose a compression level from the three available ones.
Lastly, click on the Compress PDF button to start the compression process.

Additional Features:

Convert PDF: It offers multiple PDF conversion tools like JPG to PDF Converter, Word to PDF Converter, Excel to PDF Converter, and more.
Organize PDF: It contains handy PDF manipulation tools like Merge PDF, Split PDF, Remove Pages, Extract PDF Pages, and more.

Final Thoughts:

It is another good online PDF compressor website through which users can batch compress PDF documents with ease.

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smallpdf.com

smallpdf.com is another free online PDF compressor website. Using this website, users can compress one PDF document at a time. The free version of this app can reduce PDF files up to 40 percent of their original size after the compression. Plus, the process to compress PDF documents is also quite simple using this website. Now, follow the below steps to compress PDF online using this website.

How to compress PDF online using smallpdf.com:

Go to this website and open up its Compress section.
After that, click on the Choose Files button to load one PDF file.
Next, choose the basic compression option.
Lastly, hit the Compress button to start the PDF compression process.

Additional Features:

This website can also be used to merge, split, edit, and sign PDF documents.

Limitations:

The free version of this website only allows users to compress one PDF file at a time.
This website also limits users from using the Strong Compression technique that results in higher PDF compression. To remove all the limitations, users need to purchase its premium version.

Final Thoughts:

It is another good PDF compressor website that anyone can use to compress one PDF document at a time.

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sodapdf.com

sodapdf.com is another free online PDF compressor website. Using this website, users can easily compress multi-page PDF documents. Although, it only allows users to compress one PDF file at a time. To compress the PDF, it uses the Regular compression method that reduces the PDF size by around 40 percent. Plus, the speed of compression is also quite fast. Now, follow the below steps.

How to compress PDF online using sodapdf.com:

Go to this website and open up the All tools menu.
Next, choose the Compress PDF tool.
After that, load one PDF document and choose the Regular Compression method,
At last, click on the Compress File button to initiate the compression process.

Additional Features:

PDF Conversion Tools: A good set of PDF conversion tools are offered by this website like Word to PDF, Excel to PDF, PDF to JPG, PDF to Excel, and more.
PDF Manipulation Tool: Through these tools, users can merge PDF files, Split a PDF file, Edit PDF files, Sign PDF files, and more.

Limitations:

The free version of this website imposes various restrictions like locked batch PDF compression, locked High compression method, etc. To remove all restrictions, users need to purchase its premium version.

Final Thoughts:

It is another good online PDF compressor website that anyone can use to compress, merge, split, and edit PDF files.

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Adobe pdf compressor

Adobe pdf compressor is another free online PDF compressor website. Through this website, users can compress a PDF document with ease. To compress PDF files, it offers three compression levels namely High Compression (smallest size, lower quality), Medium Compression (medium size, medium quality), and Low Compression (larger size, best quality). Besides this, many PDF manipulation tools are also offered by this website. Now, follow the below steps to perform the PDF compression.

How to compress PDF online using Adobe PDF Compressor:

Go to this website using the given link.
After that, click on the Choose File button to load the PDF file.
Next, choose a compression level from three available ones.
Lastly, start the compression process by clicking on the Compress button.

Additional Features:

PDF Manipulation Tools: This website comes with many PDF tools through which users can merge PDF files, edit PDF files, sign PDF files, convert PDF files, and more.

Final Thoughts:

It is another capable online PDF compressor website that allows users to choose different PDF compression levels to compress PDF files.

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cloudconvert.com

cloudconvert.com is a free universal file converter website that can also be used as an online PDF compressor. On this website, users can find a compress and optimize PDF tool through which they can compress multiple PDF documents at a time. Before starting the compression process, users can optimize the output PDF for Web, Print, Archive, MRC, and MAX, etc., applications. Now, follow the below steps.

How to compress PDF online using cloudconvert.com:

Visit this website using the given link.
After that, click on the Select File button to load one or more PDF documents.
Next, click on the Settings icon and choose an application for which you want to optimize output PDF files.
Lastly, hit the Compress button to start the PDF compression process.

Additional Features:

This website offers many file conversion tools like Archive Converter, Audio Converter, Video Converter, Ebook Converter, Font Converter, and more.

Final Thoughts:

It is a simple-to-use online PDF compressor website that can also be used to optimize PDF files for various applications.

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PDFcompressor.com

PDFcompressor.com is a dedicated online PDF compressor website. Using this website, users can simultaneously compress up to 20 PDF documents. Plus, it also shows the PDF compression percentage after completing the PDF compression. Now, follow the below steps to compress PDF documents using this website.

How to compress PDF online using PDFcompressor.com:

Visit this website and go to the PDF Compressor tool.
After that, click on the Upload Files button to load one or more PDF files.
As soon as you load PDF documents, this website will start the compression process and shows the compression percentage.

Additional Features:

This website can also be used to convert PDF files to PDF, JPG, PNG, DOC, etc., formats.

Final Thoughts:

It is another good online PDF compressor website that offers all the essential tools to quickly compress PDF files.

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docupub.com

docupub.com is yet another free online PDF compressor website. Using this website, users can compress one PDF document at a time. It also lets users adjust the image settings (image compression percentage and image quality) and discard objects (to discard tags, thumbnails, annotation, etc.) from PDF files before initiating the compression process. In addition to that, it also offers four PDF compression presets namely Low, Medium, high, and Maximum compression. Now, check out the below steps.

How to compress PDF online using docupub.com:

Start this website and go to the Compress PDF section.
Next, load a PDF file and adjust the image settings and discard desired objects from a PDF file.
After that, choose a compression preset from available ones.
In the end, click on the Upload & Compress button.

Additional Features:

This website also offers tools to convert, merge, scale, and resize PDF documents.

Final Thoughts:

It is a feature-rich online PDF compressor website through which users can adjust the quality of images present in PDF files as well as discard some PDF file elements.

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pdf4me.com

pdf4me.com is the last free online PDF compressor website. Through this website, users can compress only one PDF document at a time. Although, I like its ability to fetch PDF files from both local and cloud storage (Google Drive and Dropbox). After loading a PDF file, users can also choose a compression level from two available ones namely Default Compression and Max Compression. Now, follow the below steps.

How to compress PDF online using pdf4me.com:

Start this website and click on the Select File button to load a PDF file.
After that, choose a compression level.
In the end, hit the Start Compressing button to initiate the PDF compression process.