Reduce the size of large PDF documents with our free Compress PDF tool. Choose from low, medium, or high compression levels to balance file size and document quality. Whether you need to make a PDF easier to share, upload, email, or store, our tool makes the compression process fast, simple, and convenient.
Large PDF files can be difficult to upload, email, share, or store. A document containing high-resolution images, scanned pages, or embedded resources can quickly become much larger than necessary. Our Compress PDF tool helps reduce PDF file size so you can work with smaller, more manageable documents.
This online PDF compressor is designed for situations where you need to reduce the size of a PDF without manually editing every page. Simply upload your PDF, choose your preferred compression level, and start the compression process. Depending on the content of your document, the compressed PDF may be significantly smaller than the original file.
You can choose between Low, Medium, and High compression levels. Low compression is suitable when maintaining better visual quality is your priority, while High compression is useful when achieving the smallest possible file size is more important. Medium compression provides a balanced option for everyday PDF documents.
A PDF compressor is a tool that reduces the file size of a PDF document by optimising the resources stored inside it. PDF files may contain photographs, scanned documents, illustrations, fonts, metadata, and other embedded elements. Some of these resources can be optimised or reduced without significantly affecting how the document looks.
The amount of compression you can achieve depends heavily on the contents of the PDF. A text-only document may already be relatively small, while a PDF containing hundreds of high-resolution images may have much more room for size reduction.
Our tool provides three compression options, allowing you to select the balance between file size and document quality that best fits your needs.
Reducing PDF file size can be useful in many everyday situations. If a PDF is too large to attach to an email, compressing it can make sharing easier. Smaller documents can also take less time to upload to websites, cloud storage platforms, messaging applications, and online forms.
Compressing PDFs can also help when you have limited storage space. Organisations and individuals often work with large collections of reports, invoices, presentations, scanned documents, and business records. Reducing unnecessary file size can make document storage and transfer more efficient.
Compressing a PDF with our online tool is straightforward. You do not need to manually adjust individual images or modify the document's internal structure. Follow these steps to get started:
Different PDF documents require different levels of compression. Selecting the right option can help you find the best balance between file size and visual quality.
Low compression focuses on preserving document quality while providing a modest reduction in file size. It is a good choice when your PDF contains images, graphics, or visual content that needs to remain clear.
Choose Low compression when the appearance of the document is more important than achieving the smallest possible file size.
Medium compression provides a balance between quality and file size. It is suitable for most everyday documents, including reports, business documents, invoices, presentations, and general-purpose PDFs.
If you are unsure which compression level to choose, Medium is generally a practical starting point. You can then check the resulting file and decide whether additional compression is necessary.
High compression prioritises reducing the PDF's file size as much as possible. This option can be useful when you have a strict upload limit or need to send a document through a service that restricts attachment sizes.
Keep in mind that highly compressed documents may experience a greater reduction in image quality, particularly when the original PDF contains high-resolution photographs or scanned pages.
Suppose you have a 25 MB PDF containing 100 scanned pages. The document is too large to upload to a website that has a 10 MB file limit.
First, upload the 25 MB PDF to the Compress PDF tool. Since the document contains scanned pages, much of its file size may come from embedded images. You could begin with the Medium compression setting to achieve a balance between readability and file size.
After compression, imagine the resulting document is reduced to approximately 8 MB. You can now upload the smaller PDF to the website while retaining a suitable level of readability.
If the resulting file is still too large, you could try the High compression setting. However, you should always inspect the final document, especially if it contains important scanned text, diagrams, or images.
PDF compression is useful for both personal and professional documents. Students may need to reduce the size of assignments before submitting them through an online portal. Businesses may compress reports, invoices, proposals, or presentations before sharing them with clients.
Other common use cases include reducing scanned documents, preparing PDFs for online applications, optimising documents for cloud storage, and sharing large files through email or messaging services.
If your PDF contains mostly text and has already been optimised, there may be very little room for additional size reduction. Compression works best when the document contains resources that can be optimised, particularly large images or scanned pages.
Not every PDF can be reduced by a large percentage. The final file size depends on how the original PDF was created and whether its contents have already been compressed. A PDF that is already highly optimised may show only a small reduction.
If images look blurry after compression, try using a lower compression level. High compression may reduce the quality of images and scanned documents more noticeably.
PDFs containing unusual fonts, interactive elements, forms, or specialised embedded content may behave differently during compression. Always review the output before using it for important purposes.
Check that you have selected a valid PDF file and that your internet connection is stable. If the problem continues, refresh the page and try uploading the document again.
Choosing the correct compression approach can help you reduce file size while keeping the document useful and readable. Consider the following best practices:
There is no single compression percentage that applies to every PDF. The reduction depends on the document's structure, image resolution, number of pages, fonts, and the level of existing optimisation.
A PDF containing large, unoptimised images may experience a substantial reduction in size. In contrast, a text-based PDF that has already been compressed may only become slightly smaller. For this reason, the actual result can vary from one document to another.
Before compressing a PDF, think about how the document will be used. If you are submitting a document for printing, preserving visual quality may be more important. If you are uploading it to an online application with a strict size limit, reducing the file size may be the main priority.
When possible, start with Medium compression and inspect the output. If the file is still too large, try High compression. If quality is more important, choose Low compression instead.
Remember that compression is not always about achieving the smallest possible file. The ideal result is a PDF that is small enough for your purpose while still maintaining the quality and readability you need.
Compressing a PDF is a simple way to make documents easier to manage and share. The best compression level depends on your specific requirements. For everyday documents, Medium compression is a good starting point. Use Low compression when preserving quality is important and High compression when you need the smallest practical file size.
For important documents, always keep the original PDF and check the compressed version before sharing or submitting it. Pay particular attention to small text, scanned pages, images, tables, and diagrams.
Whether you are preparing a document for an online application, reducing an email attachment, or simply saving storage space, our Compress PDF tool provides a convenient way to reduce PDF file size and create a more manageable document.
PDF files are used for many different purposes, and the best compression approach can vary depending on the type of document you are working with. Understanding the nature of your PDF can help you select the most suitable compression level and avoid unnecessary quality loss.
Scanned documents can become very large because each page may be stored as a high-resolution image. This is especially common with scanned contracts, application forms, certificates, receipts, and archived paperwork. Compressing these files can significantly reduce their storage and upload requirements.
If the document contains small printed text, signatures, or detailed diagrams, start with Medium compression and check the resulting pages. If the text remains clear and the file needs to be smaller, you can try High compression.
Reports, brochures, portfolios, catalogues, and presentations often contain multiple high-resolution images. These images can contribute significantly to the overall PDF file size.
For image-heavy PDFs, compression can be particularly useful when you need to share the document electronically. If the document is intended only for screen viewing, a higher compression level may be suitable. For documents that will be printed, consider using a lower compression level to preserve image detail.
Business reports may contain charts, tables, photographs, and other graphical elements. Large reports can be inconvenient to send as email attachments or upload to internal systems.
Medium compression is generally a practical choice for business documents because it attempts to balance file size with readability. Before sending the compressed report to a client or colleague, open the output and check important charts, tables, and visual elements.
Many online application systems impose file-size restrictions. You may need to upload a resume, academic certificate, identity document, financial statement, or other supporting document.
If your PDF exceeds the website's upload limit, compressing the document may help you meet the required file size. Start with Medium compression and use High compression if the document is still above the allowed limit. Always make sure that important text remains readable before submitting it.
Compressing and splitting a PDF solve different problems. Compression reduces the file size of an existing document, while splitting divides one PDF into multiple smaller PDF files.
For example, imagine you have a 50-page PDF that is too large to upload. If the file-size limit is the problem, compression may be the best option. However, if you only need pages 1 to 10, splitting the PDF and extracting the required pages may be more useful.
In some situations, you can use both approaches. First, extract only the pages you actually need and then compress the resulting PDF. This can produce a smaller document while also removing unnecessary pages.
Converting a PDF into another format is different from compressing it. Compression attempts to reduce the file size while keeping the document in PDF format. Conversion changes the document into another file format, such as Word, JPG, or another supported format.
If you need to edit the text of a PDF, a PDF-to-Word conversion tool may be more appropriate. If you need to reduce the size of the existing PDF while keeping it as a PDF, compression is the better approach.
High compression is most useful when file size is the primary concern. For example, you may need to upload a document to a service with a strict size limit or send a file through a platform that restricts attachment sizes.
However, the smallest possible PDF is not always the best PDF. If the document contains detailed images, technical diagrams, small text, or scanned information, excessive compression may make the content harder to read.
A good approach is to start with Medium compression. If the result is sufficiently small and remains readable, there may be no reason to use High compression.
Low compression is a suitable option when maintaining the original appearance of your document is important. This may include professional presentations, marketing brochures, photography portfolios, design documents, or reports containing detailed graphics.
If the PDF will be printed or presented to customers, clients, or business partners, preserving visual quality may be more important than achieving the smallest possible file size.
The following simple decision process can help you choose a suitable compression setting:
After the compression process is complete, the resulting PDF should be reviewed before it is used for an important purpose. Check the document page by page if the file contains critical information.
Pay particular attention to small fonts, images, signatures, tables, charts, and scanned content. A document may look acceptable at first glance but could contain quality changes that are more noticeable when zoomed in.
If the output quality is not suitable, you can try a lower compression level. If the file is still too large, you can try a higher compression level or consider removing unnecessary pages before compressing the file.
The goal of PDF compression should not simply be to create the smallest possible file. Instead, the objective is to create a document that is small enough for your intended use while retaining the information and quality that matter.
Before compression, identify the reason you need a smaller file. If you need to meet an upload limit, determine the maximum file size allowed. You can then choose a compression level that helps you meet the limit without unnecessarily reducing quality.
For example, if a website accepts files up to 10 MB and your original document is 12 MB, you may only need a moderate reduction. Using the highest compression level may be unnecessary if Medium compression can already bring the file below the required limit.
An online PDF compressor provides a convenient way to optimise documents without requiring specialised desktop software. This can be useful when you are working from different devices or need to quickly prepare a file for sharing.
The simple workflow of uploading a document, selecting a compression level, and processing the file makes PDF compression accessible to users with different levels of technical experience.
It can also save time compared with manually opening a PDF in a desktop application and adjusting individual document settings. For occasional compression tasks, an online tool can be a practical solution.
Before sending or submitting your compressed document, take a moment to verify the following:
When working with documents that contain sensitive or confidential information, always consider the privacy and security requirements of your organisation or situation. This may include contracts, financial statements, personal records, identification documents, or confidential business information.
Before uploading sensitive documents to any online service, review the service's privacy and data-handling policies. If your organisation has specific rules about processing confidential files, follow those requirements.
PDF compression is often just one step in preparing a document. Depending on what you need to accomplish, you may also find other PDF tools useful.
If you need a quick way to compress a PDF, follow this simple process:
Compressing PDF files can make everyday document management easier. A smaller PDF is generally more convenient to upload, share, store, and send. However, the ideal compression level depends on the purpose of the document and the quality you need to maintain.
For most users, Medium compression is a sensible starting point because it provides a practical balance between file size and quality. If your priority is maintaining the appearance of images and graphics, Low compression may be preferable. If you have a strict file-size limit, High compression can help you achieve a smaller document.
Always review the final PDF before sharing or submitting it, particularly when working with important documents. Keeping the original file is also recommended so that you have a high-quality copy available when needed.
Whether you are reducing the size of a scanned document, preparing an application file, optimising a business report, or making an email attachment smaller, a PDF compressor can help you create a more manageable document in just a few steps.