Compress PDF
Reduce the file size of your PDF while maintaining excellent document quality.
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How to Compress a PDF
Reduce the file size of your PDF without significantly affecting document quality. Compress PDFs for email, websites, cloud storage and faster file sharing.
Overview
The Compress PDF tool reduces the size of PDF documents while preserving readability and layout. Whether you are sending documents by email, uploading files to a website, archiving records or freeing storage space, PDF compression helps make documents easier to manage. Different compression levels allow you to prioritise either maximum quality or the smallest possible file size depending on your needs. The tool works entirely in your browser, and your original PDF remains unchanged.
Benefits
How It Works
Upload a PDF document.
Choose your preferred compression level.
The PDF is analysed and optimised.
Images and internal document data are compressed where possible.
Fonts and document structure are preserved whenever possible.
A new compressed PDF is generated.
The original PDF remains untouched.
Download the optimised document.
How to Use This Tool
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1Upload your PDF document.
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2Choose the desired compression level.
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3Click "Compress PDF".
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4Wait while the document is processed.
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5Download your compressed PDF.
Helpful Tips
- Balanced compression provides the best compromise between quality and file size.
- Choose Maximum Quality for documents that will be printed.
- Choose Smallest File when sending documents by email.
- Scanned PDFs usually compress more than digitally created PDFs.
- Removing unnecessary high-resolution images before compression can further reduce file size.
- Very small PDFs may not compress much further.
- Review important documents after compression before distributing them.
- Store the original document separately if maximum quality is important.
Common Uses
Compress a 25 MB report before emailing it.
Reduce scanned document sizes for cloud storage.
Prepare PDFs for website downloads.
Optimise PDF manuals for mobile devices.
Reduce storage requirements for archived documents.
Compress invoices before sharing with customers.
Shrink presentations before uploading them.
Reduce document sizes before submitting online forms.
Worked Examples
The following examples demonstrate how this tool can be used in realistic scenarios.
Email attachment
Reduce a 30 MB PDF report so it can be sent through an email service with attachment size limits.
Website download
Compress a company brochure to improve download speeds for website visitors.
Scanned document
Optimise a scanned contract to reduce storage space while maintaining readable text.
Cloud storage
Compress multiple archived PDF documents to reduce storage usage across cloud services.
Common Mistakes
Avoid these common mistakes to achieve the most accurate results.
- Choosing the highest compression level when print quality is required.
- Expecting extremely small PDFs to compress significantly further.
- Compressing the same PDF repeatedly.
- Assuming compression removes password protection.
- Not reviewing important documents after compression.
- Expecting compression to improve low-quality scans.
- Confusing PDF compression with ZIP compression.
- Deleting the original document before checking the compressed version.
Glossary
Definitions of the most important terms used by this tool.
Compression
The process of reducing a file size by storing data more efficiently.
Portable Document Format, a widely used file format that preserves document layout across devices.
Compression Level
The amount of optimisation applied to reduce the PDF file size.
Optimisation
Removing unnecessary data and improving storage efficiency without changing the document content.
Resolution
The level of detail contained within images embedded in a PDF.
Lossless Compression
Compression that preserves all original document information.
Lossy Compression
Compression that reduces file size by removing some image detail to achieve smaller files.
Scanned PDF
A PDF created from scanned paper documents, often containing large image files.
Frequently Asked Questions
Will my PDF still be readable?
Yes. Compression is designed to reduce file size while preserving readability and document structure.
Which compression level should I choose?
Balanced compression is recommended for most users because it offers an excellent compromise between quality and file size.
Will compression affect print quality?
High compression may reduce image quality. Choose Maximum Quality if the document will be professionally printed.
Can scanned PDFs be compressed?
Yes. Scanned PDFs often achieve significant reductions because they usually contain large embedded images.
Will my original PDF be modified?
No. A new compressed PDF is created while your original document remains unchanged.
Can password-protected PDFs be compressed?
Password protection may prevent processing until the document has been unlocked.
Why did my PDF not become much smaller?
Some PDFs are already optimised or contain mostly text, leaving little opportunity for further compression.
Is there a maximum upload size?
Yes. The maximum supported upload size is 100 MB.
Things to Know
- Only PDF documents are supported.
- Compression results vary depending on document content.
- Scanned PDFs usually achieve larger size reductions.
- Very small or already optimised PDFs may not compress significantly further.
- Your original document is never modified.
Disclaimer
This tool is intended for document optimisation purposes only.
Always review compressed documents before distributing or printing important files.
SwiftVecto accepts no responsibility for quality differences resulting from user-selected compression settings.
Official References
The following official resources were used when developing this tool and are useful for further reading.