压缩 PDF
在保持质量的同时减小 PDF 体积。
将文件拖到这里
或把文件拖到这里
Compress PDF Online — Smaller Files, Same Quality
Drop in a heavy document and our free PDF compressor reduces the PDF file size in seconds. There is nothing to install and no email to hand over — just upload, compress your PDF online and download a lighter file that still looks great.
A PDF Compressor Built to Reduce PDF Size
Everything you need to compress PDF files without losing the detail that matters.
Reduce PDF file size fast
Our PDF size reducer strips out bloat and re-encodes images to shrink your file, often by 50–90%.
Quality you control
Choose how hard to compress the PDF — keep text crisp for printing or squeeze harder for email and the web.
Free PDF compressor
Compress PDF free as many times as you need. No subscription, no trial limit and no watermark on the result.
Compress PDF online
An online PDF compressor that runs in any browser on Windows, Mac, Linux, Android and iOS.
The PDF Size Reducer Millions Rely On
From students emailing assignments to teams uploading reports, people use our online PDF compressor every day to reduce PDF file size in a single click.
90M+
PDF files compressed
70%
Average reduction in PDF file size
4.8/5
Average rating from our users
100%
Free, with no watermark
How to Compress a PDF
Reduce PDF file size online in three simple steps — no account needed.
Upload your PDF
Drag and drop your file into the PDF compressor, or browse to pick a large PDF from your device.
Compress the PDF
Choose a compression level and our tool reduces the PDF size while keeping text and images readable.
Download the smaller file
Save your compressed PDF, ready to email, upload or share in seconds.
Reduce PDF File Size Without Wrecking Quality
Some compressors leave you with blurry scans and fuzzy logos. Ours is smarter: it shrinks photos and embedded fonts only as much as needed, so your compressed PDF stays clear on screen and in print. Whether it is a 100-page report or an image-heavy brochure, you get a file that is far smaller but still looks professional.
Why Choose Our Free PDF Compressor
See how our online PDF compressor stacks up against typical desktop tools.
Our compressor | Other tools | |
|---|---|---|
| Compress PDF free | Paid | |
| Works online, no install | ||
| Choose your compression level | Limited | |
| Keeps text and images clear | Varies | |
| No watermark on output | ||
| Works on any device | Desktop only |
When You Need to Compress PDF Files
However you work, a smaller PDF moves faster and fits where big files cannot.
Email attachments
Reduce PDF file size to slip under the 10MB and 25MB limits set by Gmail, Outlook and other inboxes.
Forms and portals
Compress a PDF so it fits the strict upload limits on job, visa, tax and government websites.
Faster websites
Shrink PDFs before publishing so brochures and guides load quickly for every visitor.
Save storage space
Use the PDF size reducer to archive scans and reports without filling up your drive or cloud.
What People Say About Our PDF Compressor
“I had a 40MB scanned contract that no portal would accept. This PDF compressor got it under 5MB and it still printed perfectly.”
Marcus Bell
Operations Lead
“The best free way to reduce PDF file size I have found. My slide handouts now email in seconds instead of bouncing back.”
Priya Nair
Teacher
“I compress PDF files online every week for client proposals. Fast, no watermark, and the images stay sharp.”
Elena Rossi
Freelance Designer
PDF Compressor — Frequently Asked Questions
Compress PDF Free — Start Now
Upload a file and compress your PDF online in seconds. Free, fast and easy to share.