Compress PDF — Decrease PDF Size Online Free

Decrease PDF size online free — shrink any PDF by up to 80% in seconds. No signup.

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✓ Compression complete!

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Compress PDF Online — Free, Fast, No Signup

Large PDF files are a headache — too big to email, slow to upload, and frustrating to share. PDFix compresses any PDF online in seconds, with no software to install and no account required. Upload your file, pick a compression level, and download a smaller PDF immediately. The results page shows you exactly how much space was saved.

Most image-heavy PDFs can be reduced by 50–80% in size. After compressing, you can also merge the PDF with other documents, add a watermark before sharing, or use our full guide on how to reduce PDF size for different use cases including email and cloud uploads.

Compression Levels Explained

Level	Resolution	Best For	Typical Saving
Small	72 DPI	Screen reading, web sharing	60–80%
BalancedRecommended	150 DPI	Email, general sharing	40–65%
High	300 DPI	Printing, archiving	10–30%

When Should You Compress a PDF?

Sending a PDF as an email attachment (Gmail limit: 25MB, many corporate systems: 5–10MB)
Uploading to a government portal or job application form with strict file size limits
Sharing via WhatsApp, Telegram, or other messaging apps
Reducing storage use on your phone, laptop, or cloud drive
Speeding up PDF loading when embedded in a website

For more guidance, read our optimize PDF for email guide, which explains exactly which settings to use for Gmail, Outlook, and corporate mail systems. If you need to shrink an image-based PDF, try converting the images fresh at a lower resolution before creating the PDF.

Frequently Asked Questions

How much can I reduce a PDF file size?

Image-heavy PDFs can often be reduced by 50–80%. Text-only PDFs typically shrink by 10–30%. PDFix shows you the exact before/after size after compression.

Will compressing a PDF affect quality?

It depends on the compression level. 'Balanced' (150 DPI) is recommended for most uses — significant size reduction with readable quality. 'Small' (72 DPI) gives maximum reduction for screen-only viewing.

What compression level should I use for email?

Use 'Balanced' for emailing documents where quality matters. Use 'Small' for maximum compression when the PDF only needs to be read on screen.

Is it free to compress a PDF online?

Yes, completely free. No signup, no payment, no watermarks added to your output. Files up to 5MB are supported.

Does PDFix keep my files after compression?

No. All uploaded and processed files are automatically deleted from our servers within 15 minutes.