How to Compress Your PDF Documents from MB to KB Online

September 03, 2021Ashley Mae

Suppose you have just made a great PDF with everything included, but there is a problem. The document is too large to send it to your colleague or business partners through the internet. The next thing emerging in your mind is shrinking megabytes to make it smaller. Is there any way to compress PDF online while maintaining the quality and all information? Luckily, you will find five options in this guide below.

Compress PDF Online

Part 1: Top 5 Ways to Compress PDF Online

Top 1: Compress PDF Online without Losing Information

Compressing PDF online is not an easy job, especially for beginners and average people. The diverse custom options may be confusing users. Fortunately, Aiseesoft Free Online PDF Compressor can help you resolve this issue.

Key Features of the Best PDF Compressor Online

How to Compress a Large PDF Online

Step 1:
Visit in your browser when you got a large PDF file.
Select PDF File
Step 2:
Click the Select PDF File button, find document and upload it. Alternatively, you can drag and drop it into the dotted box on the web page to upload it directly.
Compress PDF
Step 3:
Once uploading is done, the PDF compressor online will work automatically. Wait for the process to finish and click the Download the PDF button to save the smaller document to your drive. If you have more than one PDF file, click the Compress Next PDF button to begin compressing the others.
Download PDF

Top 2: Compress PDF Online on Adobe Acrobat Online

Adobe Acrobat is a popular PDF viewer. The pro version offers bonus features like PDF compressing. The good news is that Adobe also released a PDF compressor online. It enables you to shrink a PDF document easily.

Key Features of Adobe Acrobat Online

How to Compress a PDF on Adobe Acrobat Online

Step 1:
Open in a browser. Then the web PDF compressor will show up.
Select File
Step 2:
Click the Select a file button and upload the large PDF from your computer. Then select Hight compression, Medium compression, or Low compression based on your situation.
Compress File
Step 3:
Press the Compress button to begin. When compressing is done, click the Download button and follow the instructions to save it to your computer. The share and online storage are only available to users with an account.

Top 3: Resize a PDF Online by SmallPDF

SmallPDF is a free PDF solution online. It comes with a PDF compressor and a lot of tools to edit and convert documents online. There is purchase or payment option. Everyone can use it for free with some limited, like handle two PDFs per day.

Key Features of SmallPDF

How to Resize a PDF on SmallPDF

Step 1:
Copy and paste in the address bar of your browser, and hit Enter key on your keyboard. Select Compress PDF to open the webpage.
Step 2:
Hit the CHOOSE FILES button and upload a PDF from your computer or cloud service. Select Basic compression or Strong compression. The latter is only available to Pro users.
Choose Level
Step 3:
Click the Choose option button to initiate resizing PDF online. At last, click the Download File button to save the smaller document or save it to Dropbox or Google Drive.

Top 4: Reduce PDF Size Online via SodaPDF

SodaPDF is a popular PDF solution online too. Since it is available to a wide range of languages, this PDF compressor online is widely used around the world. PDF compressing is just one feature on the platform.

Key Features of SodaPDF PDF Compressor

How to Compress a PDF Online on SodaPDF

Step 1:
Visit in a browser, go to Online Tools menu, and choose Compress PDF. Or you can open the PDF compressor page from directly.
Step 2:
Click the Downward button and choose where to upload the PDF, like From Device, Google Drive, or Dropbox. Select Regular Quality and hit the COMPRESS FILE button to start compressing PDF online. For premium users, there is a High Quality option available.
Step 3:
It takes a while from several seconds to a few minutes. When your file is ready, click the DOWNLOAD FILE button and download it to your disk.

Top 5: Reduce PDF File Size Online by iLovePDF

iLovePDF provides an efficient PDF compressor online. It claims to help you reduce file size while optimizing for maximal PDF quality. According to our research, the output quality is not very good.

Key Features of iLovePDF PDF Compressor

How to Compress a PDF Online by iLovePDF

Step 1:
Visit in a browser to open the web PDF compressor directly.
Step 2:
Click the Select PDF file button to upload a PDF from your computer, or select Google Drive and Dropbox to open PDF from your account. Then hit the Compress PDF button initiate the process.
Compress PDF

Tip: You can change the compress level by hitting the Gear icon.

Step 3:
After compressing, the web app will download the small file immediately. You can also send it to cloud service or share as a link.

Part 2: FAQs about Compressing PDF Online

Can I compress a MB PDF to KB online?

Yes, it is possible to compress a large PDF file to KB online with a powerful tool. We have shared five options and you can try them one by one until you find the proper tool.

How to compress an encrypted PDF?

Most online PDF compressors cannot handle protected documents. You have to unlock them with password or PDF decrypting tool before compressing.

Why my PDF is still very large after compressing?

Some PDF files are still large after compressing. It is because the way you created the document, such as the PDFs created by scanner. Moreover, a proper PDF compressor can determine the result too.


Now, you should learn at least top 5 ways to compress PDF files online. They can help you produce smaller PDF documents without installing any software. Aiseesoft Free Online PDF Compressor is the best choice for beginners. It is not only easy to use, but also able to protect the quality and information on your document when compressing. If you have more questions involved, please feel free to leave your message below this post.

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1.1 How to Compress PDF Files 1.2 Best Solutions to Split PDF Pages 1.3 How to Reduce the PDF Size 1.4 How to Crop PDF file 1.5 Password Protected PDF File 1.6 How to add Page Numbers to PDF 1.7 How to Free Highlight Text in PDF 1.8 How to Remove Watermark in Word 1.9 How to Rotate PDF 1.10 How to add Text to PDF 1.11 Compress PDF Size on Mac 1.12 Compress PDF in Adobe 1.13 Compress PDF Online 1.14 Shrink PDF
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