Free PDF Compressor - Reduce PDF File Size Online
Shrink large PDFs for email, cloud storage, or web sharing. Reduce file size significantly while keeping your content readable. All in-browser, no upload.
What is Compress PDF?
Large PDF files cause headaches: email attachments get rejected, upload forms have size limits, and slow downloads frustrate recipients. Our free PDF Compressor reduces file sizes significantly while maintaining the best possible visual quality.
The compression works by stripping unnecessary metadata, optimizing embedded images at a lower quality, and removing redundant data from the PDF structure — all using pdf-lib running locally in your browser. You can choose between different compression levels (moderate, high, maximum) depending on your quality-size trade-off requirement.
A before-and-after file size comparison is shown so you always know exactly how much space you saved. For most standard documents with embedded images, reductions of 30–70% are typical. For scanned image PDFs with high-resolution photos, savings can be even greater.
Because compression runs entirely in-browser, your confidential documents, financial statements, or medical records are never sent to any server. Privacy is guaranteed by design.
Powerful Features
Everything you need in one amazing tool
Multiple Compression Levels
Choose Moderate, High, or Maximum compression based on your quality requirement.
Before/After Size Display
See exact original vs compressed file size and the percentage reduction achieved.
Private Processing
Files never leave your device. Compression runs locally using pdf-lib.
Image Optimization
Embedded images are re-encoded at lower quality to achieve the biggest size savings.
Metadata Stripping
Optionally remove PDF metadata to trim file bytes and protect sensitive info.
Instant Results
No server queue. Compression completes in seconds in your browser.
How It Works
Get started in 4 easy steps
Upload Your PDF
Drop or select the PDF you want to compress. File size is shown immediately.
Choose Compression Level
Pick Moderate (best quality), High (balanced), or Maximum (smallest size).
Compress
Click Compress PDF. The browser optimizes the file and shows the size reduction.
Download Compressed PDF
Save the compressed file. Check the size comparison to confirm savings.
Why Choose Our Compress PDF?
Stand out from the competition
Confidential Files Safe
Financial reports, legal docs, and medical PDFs never leave your device.
Transparent Results
Clear before/after comparison so you know exactly what compression delivered.
Quality Control
Three compression levels let you choose the right quality-size balance for your use case.
No Server Queue
Instant results with no waiting. Compression finishes in your browser immediately.
Size Comparison Preview
See original vs. compressed file size before downloading so you know exactly what to expect.
Free, Zero Limits
No file count limits, no watermarks, no sign-up needed. 100% free and completely private.
Perfect For
See how others are using this tool
Email Attachments
Reduce PDF size to fit within email attachment limits (25 MB for Gmail).
Cloud Storage
Save cloud storage space by compressing large archives of PDF documents.
Web Publishing
Compress PDFs for fast web download. Smaller files = better user experience.
Mobile Sharing
Reduce size before sharing via WhatsApp, Telegram, or other mobile apps with limits.
Web Upload Compliance
Reduce PDF size to meet file upload limits on government portals, CRM systems, or job boards.
Cloud Storage Saving
Compress large PDF archives to save storage space on Google Drive or Dropbox.
Frequently Asked Questions
Everything you need to know about Compress PDF
Typical reductions are 30–70% for documents with embedded images. Text-only PDFs compress less. Maximum mode achieves the smallest output.
Text is vector-based and is not affected by compression. Only embedded raster images lose some quality at higher compression levels.
No. Compression runs entirely in your browser via JavaScript. Your file never leaves your device.
For documents you'll print or display at full size, use Moderate. For email attachments, use High. For archival where size matters most, use Maximum.
No. The output is a standard PDF that opens in all PDF viewers including Adobe Reader, Mac Preview, and Chrome.
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