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[2024] Top 7 Best PDF Optimizer for Free

Melissa Lee updated on Mar 20, 2024 | Home > PDF Editor Tutorials | min read

Nowadays, it's common to reduce PDF size. However, you may worry about the quality when compressing your files. The PDF editors provide functionality for optimizing the PDF files that can solve that problem. With PDF optimizers, you can reduce image resolution while keeping document fidelity. Meanwhile, batch advanced settings allow you to edit more parts. 

Top 7 Best PDF Optimizer:

1. EaseUS PDF Editor

Compatibility: Windows 7/8/8.1/10

EaseUS PDF Editor is one of the best and reliable PDF editors that provide the most useful editing functions such as optimizing and compressing PDF documents in high performance. With this tool, you can optimize the given document using the optimizer settings. The optimizer is an optional compress utility class that can be used to optimize PDF documents by reducing the file size, removing redundant information, compressing images without losing quality, and so on.

Key Features:

  • Manage tons of PDF files with ease
  • Add digital signatures to PDF files
  • Protect the PDF with a password
  • Add watermark to PDF

Use the advanced options in the free PDF optimizer dialog box to reduce the size of files.

pdf optimizer

Options for EaseUS PDF Editor:

Its optimizer allows the following operations to help you deal with a PDF.

  • 1. Images Panel
  • Reduce image resolution while maintaining fidelity. The images panel provides options for monochrome image compression, image downsampling, and so on.
  • 2. Fonts Panel
  • Make fonts embedded and unembed. For example, to ensure an exact match to the source document, it’s advisable to embed all fonts used in the document.
  • 3. Discard Objects Panel
  • Let you specify objects to remove from the PDF. You can discard objects created in this editor. For example, you can discard all form submissions, import and reset actions, flatten form fields, and so on.
  • 4. Discard User Data Panel
  • Remove any personal information that could be shared with others. It helps in discarding all comments, private data, document information, and file attachments.
  • 5. Clean Up Panel
  • Allow you to remove useless items from the documents. Select elements that are obsolete or unnecessary for your file. For example, discard invalid links, bookmarks, and so on.

The optimizer gives you complete control over the elements of your compressed PDF file. Based on how you intend to compress the files, you can set different options. Let's look at how to optimize your PDFs.

Steps to guide you on optimizing:

Step 1. Launch EaseUS PDF Editor and open the PDF to which you want to add the drop-down list.

open the pdf file

Step 2. Click "Optimize current document" from "Compress" button. Then, you see the Optimizer dialog box.

pdf optimizer

Step 3. Select the check box next to a panel such as Images, Fonts, or Clean Up. Then, set the advanced option from the panels in this dialog box. When you finished selecting options, click "OK".

pdf optimizer two

2. Adobe Acrobat DC Pro

Compatibility: Windows and Mac

Adobe originally creates PDF format, which makes your work much more convenient. Adobe's PDF optimizer function is very helpful as it provides many advanced settings for reducing the size of files. Choose from default or custom settings, users can efficiently optimize their files based on their needs.

The only problem is the purchase price is not cheap. If you want advanced features, then Adobe will be your choice as it has detailed control over the documents.

adobe pdf optimizer


  • High customer satisfaction
  • Accurately convert PDF files
  • Easily create, fill, and sign PDFs


  • Expensive purchase price
  • Some functions are complex

3. Nitro PDF

Compatibility: Windows

Nitro Pro can help you reduce the size of files effectively. It includes powerful options for optimizing PDFs by discarding useless objects, removing invalid links, and compressing images. Simply click on the "Optimize", and you can freely use custom settings to compress your files. Meanwhile, batch processing capabilities make it easy to share with others.

nitro pdf


  • Best free PDF compressor
  • Add, delete, and modify text and images
  • Create fillable form scratch
  • Create sharing links for PDFs


  • Full capabilities in a paid version

4. PDF Online

Compatibility: Online

Without any installation, this online tool provides you with advanced settings in compressing. The online optimizer helps reduces file size while maintaining target quality as it involves images, font, and structure settings. Just drag or drop your files into the program, you can optimize your documents fastly. Also, you can use the online extract text tool to help you extract items in PDFs such as text, images, bookmarks, annotations, and so on.

pdf online


  • Encrypt PDF documents
  • Batch conversions
  • View and redact PDF in browser


  • Must pay to access all features
  • Need registration for this service

5. PDF2Go

Compatibility: Online

PDF2Go is a free online editor that lets you optimize a PDF on the web. Simply drop files into this tool, and you can optimize your PDF files for web sharing, streaming, and showing using fast web view.

Meanwhile, with the help of this tool, you can edit a lot on your PDF. You can add or delete text, mark sentences, and do a lot of other editing features.

pdf optimizer


  • Change PDF page size
  • Edit, merge, split, and rotate PDFs
  • Protect and unlock PDFs


  • No additional settings on optimizing function
  • Unlimited access to all tools in the paid version

6. AvePDF

Compatibility: Online

This editor allows you to optimize a PDF for faster web display. Simply drop or upload your file to the website, and the online optimizer will automatically optimize your files. You can then download the web-optimized PDF file to your computer or save it to a cloud storage service.

Additionally, not only optimizing, but this tool also supports converting, editing, protecting, and other functions in your PDFs.

avepdf optimizer


  • Rich features, and affordable price
  • High customer satisfaction


  • Some features are complex
  • Limit in setting options

7.PDF Resizer

Compatibility: Online

This tool allows you to optimize and compress PDFs to reduce file size, for example, you want to share your files that fit the file size limit of share attachments. With guaranteed quality, you can use this online PDF optimizer to upload and optimize up to 50 files at the same time.

pdf resizer


  • Without installation
  • PDF rotator tool
  • Merge, split, and resize PDFs


  • The maximum combined file size is just 60MB
  • A limit to the number of settings

PDF Optimizer FAQs

Check the frequently asked questions related to this topic below.

1. What is PDF Optimizer?

PDF Optimizer is a scriptable server tool that can simplify the PDF file size reduction process to facilitate PDF file sharing downloading. It will optimize your PDF files and preserve the fidelity of the original document at the same time.

2. How do I Optimise a PDF?

You need to go to Adobe Acrobat Pro and follow the operations below to optimize a PDF file.

  • Choose "File", "Save As Other", and "Optimized PDF".
  • Or you can go to "Tools" and "Optimize PDF", and then click "Advanced Optimization" to optimize your PDF.

3. What happens when you optimize a PDF?

If you use EaseUS PDF Editor, the PDF file will be reduced in size but the formatting and quality will remain the same.


The optimizing function in PDF editors can help you effectively reduce the file size. With advanced settings in the optimizer, you can compress files to any extent you want. Among them, EaseUS PDF Editor is recommended as a representative of an efficient PDF editor to help you optimize PDFs. It's an all-in-one editing software to edit your PDFs with good effect.

About the Author

author Melissa Lee

Melissa Lee

Melissa is a sophisticated editor for EaseUS in tech blog writing. She is proficient in writing articles related to screen recording, voice changing, and PDF file editing. She also wrote blogs about data recovery, disk partitioning, and data backup, etc.

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