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PDF Compression
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2 files, max 5M each
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About This Tool
PDF Compression is a free-daily-credit online PDF compression tool that works right in your browser with no installation and no sign-up. It significantly reduces file size while keeping clarity as much as possible, supporting four levels — Light, Normal, Strong, and Extreme — with real-time compression ratios. All processing is done locally in your browser, giving you 100% privacy protection with files never uploaded to any server. Whether you are emailing, uploading to a platform, or backing up, this tool makes it effortless — drag-and-drop ready, with results rivaling professional PDF software. (Note: the free credit refers to daily free uses, not unlimited; upgrade to member for higher or professional needs)
How to Use
- Upload Files
Click the upload area or drag and drop a PDF file into the box, supporting batch upload of multiple files
- Choose Level
Drag the slider to choose the compression level (Light / Normal / Strong / Extreme) — higher levels mean smaller files
- Process & Download
Click the "Start Process" button and download the smaller PDF when done
Use Cases
- Email sending: shrink a large PDF below the attachment limit before sending
- Platform upload: meet website/system file-size limits after compression
- Storage backup: reduce size to save cloud and device space
Key Advantages
- Daily Free Credit
Enjoy free uses every day; light everyday compression needs are fully covered at zero cost, letting you experience the complete feature set without paying
- Privacy & Security
All processing happens locally in your browser, and your files are never uploaded to any server, protecting your privacy throughout
- Four Levels
Provides Light, Normal, Strong, and Extreme — four compression levels, from near-lossless to high compression
- Shows Ratio
Displays the compression ratio for each file in real time, so you always know the effect
- Batch Processing
Compress multiple files at once, each handled independently, with results packaged into a single ZIP download
- Works Everywhere
No software to install — just open your browser on a computer, phone, or tablet to process anytime, anywhere
Compression Level Comparison
Each compression level trades off file size against clarity. Choosing the right one better meets your actual needs. The table below compares them in detail:
| Compression level | Effect | Best for |
|---|---|---|
| Light | Lowest ratio, nearly lossless quality | Formal documents where clarity matters most |
| Normal | Balances compression and quality for daily use | Everyday compression of general office documents |
| Strong | Clearly smaller files, slightly reduced clarity | Email attachments, platform uploads and similar |
| Extreme | Smallest files, more visible clarity loss | When quality matters less and size is key |
FAQ
The PDF compression tool is an online PDF slimming utility. It reduces PDF file size while keeping clarity as much as possible, supporting four compression levels — Light, Normal, Strong, and Extreme — all processed locally in your browser with no file upload required.
It's very simple. Upload a PDF file, drag the slider to choose a compression level, then click "Start Process" to download the compressed PDF.
Higher levels compress more, so image-based PDFs lose some clarity. For best quality, choose "Light" or "Normal".
Processing runs locally in your browser and is limited by device memory. Very large files may be slow or fail; we recommend under 200MB per file.
Yes, fairly fast. The tool uses an efficient batched concurrent approach, compressing multiple files at once and finishing ordinary documents within seconds.
Completely secure. Files are processed entirely in your local browser and never uploaded to any server — your data is absolutely safe.
Free uses are granted every day, so everyday usage costs nothing. We provide a daily free credit that easily covers light needs; when you require higher processing volume, upgrading to member unlocks more benefits.
Yes. This is a pure web app that works directly in the browser on a phone, tablet, or computer — no software installation needed.
The online version is far more convenient. No installation needed — it's open-and-use with equally professional results, perfect for file slimming anywhere.
For security reasons, please remove the password from encrypted or password-protected PDFs before processing.
If the source PDF is already heavily compressed (e.g., a scan), further compression has limited effect; try "Strong" or "Extreme".
Yes. Multiple files can be uploaded in batch; each is compressed separately and downloaded as a package.
Content last updated：2026-07-10
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