Compress PDF

PDF → PDF

Shrink PDF file sizes up to 90% without compromising visual quality. Our local optimizer subsets fonts and downsamples images directly on your device.

Why Compress PDF Stands Out

Trusted by millions worldwide

28K+

PDFs Compressed

9K+

Daily Users

62%

Average Compression Ratio

99.97%

Uptime SLA

About this tool

About Compress PDF

Compress PDF is a free, browser-based tool that lets you shrink PDF file sizes by up to 90% without compromising visual quality. Our local optimizer uses intelligent downsampling and font subsetting to shrink your documents directly on your device. It supports PDF → PDF compression. Everything runs locally on your device, so your files are never uploaded to a server. There's no sign-up, no watermark, and no limit — just open Compress PDF, add your input, and get a smaller, optimized PDF instantly. Perfect for email attachments, website uploads, cloud storage, or any situation where file size matters.

Professional PDF Compression Applications

Trusted by businesses, students, and professionals worldwide

Email Attachments

Reduce PDF file sizes to meet email attachment limits (typically 10-25MB) while maintaining document readability.

Example: Compress a 15MB presentation PDF to 3MB so it can be sent via email without bouncing.

Cloud Storage

Shrink PDFs to save storage space and reduce upload times when using Google Drive, Dropbox, or other cloud services.

Example: Compress multiple PDF reports before uploading to Google Drive to stay within your storage quota.

Website Uploads

Reduce PDF file sizes for faster website uploads and better user experience on your site.

Example: Compress PDF catalogs and brochures before uploading to your business website for faster loading.

Mobile Optimization

Create mobile-friendly PDFs that load quickly on smartphones and tablets.

Example: Compress PDF manuals so they can be viewed quickly on mobile devices without long load times.

Document Archiving

Compress PDFs for efficient digital archiving and storage management.

Example: Compress old project PDFs before archiving them to save server storage space.

File Sharing

Reduce PDF sizes for easier sharing via messaging apps, file transfer services, or collaboration platforms.

Example: Compress a large PDF report before sharing it via Slack or Microsoft Teams.

Print-Ready Documents

Compress PDFs while maintaining print quality for physical document production.

Example: Compress a PDF flyer before sending it to the printer to reduce file transfer time.

Database Storage

Reduce PDF sizes before storing in databases or content management systems.

Example: Compress PDF attachments before storing them in your CRM system to save database space.

Client Deliverables

Compress PDFs before sending deliverables to clients via email or file sharing services.

Example: Compress a 20MB design proof PDF to 5MB before emailing it to your client.

E-books & Digital Publications

Compress PDF e-books and digital publications for faster downloads and reduced bandwidth usage.

Example: Compress a PDF e-book before uploading it to your website for distribution.

Pro Tips for Optimal PDF Compression

Trusted by efficiency-focused users globally

Start with Medium Compression

Medium compression offers the best balance between file size reduction and quality preservation for most use cases.

Compress Images First

If your PDF contains many high-resolution images, consider compressing them before creating the PDF for even smaller file sizes.

Check Before and After

Always compare the compressed PDF with the original to ensure the quality meets your requirements.

Choose Based on Use Case

Use Low compression for printing, Medium for sharing, and Extreme for email attachments where size is critical.

Keep Original Backup

Always keep a backup of the original uncompressed PDF in case you need the highest quality version later.

Compress in Batches

Upload multiple PDFs at once and compress them all together to save time when working with many files.

Test Different Levels

Try different compression levels to find the optimal balance between file size and quality for your specific document.

Text-Heavy PDFs

For PDFs with mostly text, you'll achieve better compression with font subsetting. These typically compress more than image-heavy PDFs.

Monitor Compression Results

Check the file size before and after compression to verify the reduction percentage meets your needs.

Combine with Other Tools

After compressing, use our Protect PDF tool to add password protection, or Merge PDF to combine multiple compressed files.

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Answers and guidanceFrequently Asked Questions

Will I lose text quality?

No, text remains vector-based and crisp. Only embedded images are downsampled to reduce size.

How much smaller will my file get?

Depending on the images embedded, PDFs typically see a 40% to 90% reduction in size. Most users achieve around 62% compression on average.

Is Compress PDF free to use?

Yes. Compress PDF is completely free with no usage limits, no watermarks, and no sign-up. You can use it as often as you need.

Do I need to install any software to use Compress PDF?

No. Compress PDF runs entirely in your web browser. There's nothing to download or install u2014 just open the page and start compressing.

Are my files private and secure with Compress PDF?

Yes. Compress PDF processes everything locally on your device. Your files are never uploaded to a server, so your data stays private and is cleared when you close the tab.

Does Compress PDF work on mobile and tablet?

Yes. Compress PDF works in any modern browser on desktop, laptop, tablet, and mobile u2014 no app required.

What's the maximum PDF file size I can compress?

You can compress PDF files up to 100MB in size. Since processing happens locally, you're only limited by your device's available memory.

Can I compress multiple PDFs at once?

Yes! Upload multiple PDF files and our batch processor will compress them all in one go, saving you time.

How do I choose the right compression level?

Start with Medium compression for a good balance. Use Low if you need minimal reduction with maximum quality, or Extreme if file size is your top priority.

Does Compress PDF support all PDF versions?

Yes. Our tool supports all standard PDF versions including PDF 1.3 through PDF 2.0, as well as PDF/A and other specialized formats.

Can I compress password-protected PDFs?

No, you cannot directly compress password-protected PDFs. You would need to remove the password protection first using our free Unlock PDF tool, then compress the unlocked PDF.

What's the difference between Compress PDF and other tools?

Unlike cloud-based compressors that upload your files to servers, Toolyconvert processes everything locally in your browser. This means better privacy, faster processing, and no risk of data exposure.

Do I need an internet connection to use Compress PDF?

You need an internet connection to initially load the web page. Once loaded, the compression happens offline in your browser, so you can continue working even if your connection drops.

Will the compressed PDF still print correctly?

Yes. While images may be downsampled for screen viewing, the compression maintains print quality for most standard printing applications.

Can I compress PDFs for email attachments?

Absolutely! Compress PDF is perfect for reducing file sizes to meet email attachment limits while maintaining readability.

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