Table of content

Share this article

  • Home
  • /
  • Blog
  • /
  • Compress PDF to 100KB or Less with 5 Fast Methods [2025 Latest]

Compress PDF to 100KB or Less with 5 Fast Methods [2025 Latest]

  • By Charlotte
  • |
  • Follow
  • twitter
  • |
  • Updated on July 30, 2025
Introduction:
Everyone may have encountered the problem of trying to send or upload large PDF files. PDFs can eat up your disk space, increase your storage cost, and hinder your information sharing. If you have the need to reduce the file size, from a bigger size to a smaller one, knowing the best way and a PDF compressor is useful. Sometimes you may want to handle documents on your desktop, and some other times online. Next, explore how the 5 PDF compressors and methods enable you to efficiently compress a PDF to 100KB or below 100KB, as outlined in this SwifDoo PDF post.
summary

Compress PDF to 100KB or Less with SwifDoo PDF

SwifDoo PDF is a powerful and lightweight PDF editing software available on Windows PCs. It offers three compression levels. Better yet, it allows you to customize the image quality and resolution for optimal compression. Those who have numerous PDFs to compress are able to fulfill the task in a short time using the batch compression function.

Download and install the PDF compressor application, and use the steps below to compress a PDF to 100KB or less than 100KB.

Step 1: Launch SwifDoo PDF and open the PDF you are to compress to 100KB with it.

Step 2: Click Edit on the menu bar and choose the Compress option.

Compress PDF to 100KB with SwifDoo PDF step 2

Step 3: Hit the Compression Level drop-down menu to select High, and click Custom for the image output quality setting.

Compress PDF to 100KB with SwifDoo PDF step 3

Step 4: Tap Start to reduce the PDF size to 100KB in seconds.

You can compress a PDF to 100KB for free with the offline SwifDoo PDF software. All you need is a free trial that allows you to access the PDF size compressor as many times as you wish and compress as many files as you have to 100KB, 200KB, 500KB, etc. No credit card is required. Like other best PDF editors, it can also split, convert, create, and do many more things to PDFs. It lets you compress image, Word, PowerPoint, and other files. 

Reduce PDF Size to 100KB or Under 100KB with Preview

Preview is a built-in PDF compressor on Mac to compress a PDF to 100KB or below 100KB. So you don’t need to spend even a dime or look for third-party apps. No compression level to choose from, but it’s enough to use if your requirement is not that severe. The application can also assist in converting PDF to image format and combining PDF files.

Step 1: Open a PDF in the application.

Step 2: Click File at the top and choose Export from the drop-down list.

Step 3: Hit the Quartz Filter button to select Reduce PDF File Size Better, and click Save.

Compress PDF to 100KB with Preview

After you use the PDF size reducer to compress a PDF file to 100KB for free offline, right-click the file and choose “Get info” to check the resulting size. You may need to compress many times to reach the final size.

Compress PDF Online to 100KB Using Pi7 PDF Tool

Pi7 PDF Tool is a fantastic tool to compress a PDF to 100KB. Whether to resize a PDF smaller or even larger, it's capable. Not only in the best PDF compressors' list, but it also has a place in compressing images. The web-based software allows you to shrink your PDF to the specified size in one operation. There is no hidden fee, but the ads on the website support the free services. 

Step 1: Click Compress PDF on the top navigation bar of pdf.pi7.org. 

Step 2: Hit Select PDF to browse your device and upload the PDF to be compressed. 

Compress PDF Online to 100KB Using Pi7 PDF Tool

Step 3: Enter the number 100 into the PDF Size field, and click Compress to wait for the website to reduce the PDF size.

Compress PDF to 100KB or Less with Adobe Acrobat Online

The Adobe Acrobat online PDF compressor lets you compress a PDF to 100KB or under 100KB online for free. You sign in to the online service in any browser and upload a PDF. The PDF file size compressor offers low, medium, and high compression levels. The estimated file size after compression is displayed under each of the three options. Adobe Acrobat also lets you convert PDFs online for free, with limitations.

Take the following steps.

Step 1: Get to the website and choose Compress from the top menu bar.

Step 2: Click Select a file to upload the PDF file required to be compressed to 100KB.

Step 3: Pick your preferred compression level and click Compress.

Step 4: After you strongly compress the PDF to 100KB or less than 100KB, click Download to save the smaller file.

Compress PDF to 100KB with Adobe Acrobat Online

Smallpdf PDF Compressor to Reduce PDF Size to 100KB

Smallpdf is an online PDF size reducer to tackle how to compress a PDF to 100KB. It doesn’t ask you to sign up and allows you to upload files from Google Drive and Dropbox. The compression process is so streamlined.

Step 1: Explore all PDF tools on the site and choose Compress PDF.

Step 2: Upload your PDF document, and the compressor works its magic immediately;

Step 3: When the Success prompt appears, you can see whether you have compressed the PDF file size to 100KB.

Compress PDF to 100KB with Smallpdf

If you wish to compress PDFs to 100KB in batches, this online compressor isn’t the choice, and you should go with professional desktop software like SwifDoo PDF.

Sometimes you can successfully compress a PDF to a 100KB or lighter PDF using the above steps, especially for a small file. However, there is no compression level to select, so you may fail. To get a large PDF resized to 100KB, become a pro user for strong compression.

How to Pick the Best PDF Compressor

  • If you want to compress a PDF to 100KB without losing quality, the important thing is to avoid choosing the highest compression level. The smaller the file size, the lower the file quality. It would be best if you could decide the image quality in the compressed PDF, which SwifDoo PDF can help.
  • If you need to do PDF-to-PDF compression to 100KB without downloading third-party apps, then Adobe Acrobat online PDF compressor or the native Preview for Mac is the ideal solution.
  • Those who want a PDF compressor to extremely compress PDFs to 100KB or less than 100KB, try SwifDoo PDF to choose the High compression level, or purchase the pro version of Smallpdf to use the strong compression feature.

Conclusion

With one of the methods and PDF compressors, you can compress and reduce the PDF size to 100KB or close to 100KB. If it isn’t, switch to another mentioned software to compress a second time and resize the file further.

Anyone who likes to compress multiple PDF files to 100KB or less than 100KB for free should try SwifDoo PDF. The PDF solution allows you to do a lot more with PDFs, depending on your needs, like splitting and cropping PDF pages, not just compressing the size of a PDF.

Share this post if you feel it’s helpful to let more of your friends know the productive PDF compressing methods.

Charlotte has been in the software industry for 8+ years. She works for AWZWARE now as a passionate writer. She is good at providing simple guides to use various video, office and entertainment software. Charlotte also recommends many other useful tools to make your work and life easier. A food lover too.

Related Articles