Compress PDF — Free Online Tool

Compress PDF

This online PDF compressor is completely free and easy to use. Reduce the file size of your PDF documents without losing quality. Choose your compression level and download instantly.

Drop your PDF here or click to upload
📁 🔗 🟢 🔵 ☁️ 📋
—
Original Size
—
Pages
—
Est. Saving
📄
—
—
Choose compression level:
🟢
Low
Minimal compression. Best quality. Small size reduction.
🟡
Medium
Balanced compression. Good quality. Recommended.
🔴
High
Maximum compression. Smaller file. Slightly lower quality.
Image Quality 70%
Maximum CompressionBest Quality
Compressing...
Original Size
—
→
Compressed Size
—
You Saved
—
✅
PDF Compressed Successfully!
🎉 0% smaller

⬇ Download Compressed PDF
How to compress a PDF online
1
Upload the PDF file you want to compress.
2
Choose a compression level — Low, Medium, or High — and adjust the image quality slider.
3
Click "START" to compress your PDF instantly in the browser.
4
See the before/after size comparison and click "Download" to save your compressed PDF.

COMPRESS YOUR PDF ONLINE

FREE, FROM ANYWHERE

🗜

How To Compress a PDF

Upload any PDF and choose your compression level. Low keeps quality high, High gives the smallest file size. Adjust the image quality slider for fine control.

See exact before/after size after compression.

⊞

Online PDF Compress Service

No software installation needed. Compress PDFs entirely in your browser — no downloads, no risk of viruses.

Works on Windows, Mac, Linux, iOS and Android — any device.

💡

Why Compress a PDF?

Large PDFs can be hard to email or upload. Compressing reduces the file size so it's easier to share.

Ideal for scanned documents, reports, and image-heavy PDFs. Tip: You can also merge PDFs.

🛡

Your Files Stay Private

Everything runs 100% in your browser. Your PDF is never uploaded to any server and is never shared with third parties. Completely safe and private.

⚖️

Quality vs Size Balance

Choose Low compression to keep near-original quality. Choose High for the smallest file. Medium is recommended for most use cases — a good balance of quality and size.

📱

Works On Any Device

Not limited to desktop. Use this tool on your phone or tablet from anywhere — just open your browser, upload your PDF, and compress in seconds.

★★★★★ 4.8 / 5 — 19,542 votes | You need to compress at least 1 file to provide feedback
Frequently Asked Questions
Is this PDF compress tool really free? +
Yes, completely free. No hidden charges, no subscription, no sign-up required.
Are my PDF files safe and private? +
Absolutely. Everything runs 100% in your browser. Your files never leave your device — no server uploads, no third-party access. Your documents are completely private.
How much can I reduce the file size? +
It depends on the content. PDFs with many images can be reduced by 50–80%. Text-heavy PDFs with no images will see less reduction since text is already very compact.
Will compression affect the quality of my PDF? +
Text and vector graphics are not affected. Only embedded images are compressed. Use Low compression or a high quality slider value to keep near-original image quality.
What is the difference between Low, Medium, and High compression? +
Low compression preserves maximum image quality with a smaller size reduction. Medium is the best balance for most use cases. High gives the smallest file size but may slightly reduce image sharpness.
Do I need to install any software? +
No installation needed. Works entirely in your web browser on any device — Windows, Mac, Linux, Android, and iOS.
Can I compress a password-protected PDF? +
You may need to remove the password first. Use our PDF Unlock tool to decrypt it, then return here to compress.
Does it work on mobile? +
Yes! The tool is fully responsive and works on any mobile browser — iPhone, Android, or tablet. No app download needed.

📰 BLOG & ARTICLES

📄 » ✉️
HOW TO
How to compress a PDF for email
This article explains how to easily compress PDF files so they can be sent by email.
Read more →
📄 » 📄
HOW TO
How to merge PDF files into a single PDF
This article explains how to easily merge PDF files with our free online converter.
Read more →
📄 » 🔒
HOW TO
How to prevent people from modifying your PDF files
The article explains how to password protect a PDF.
Read more →
Read more ›