Compress PDF Online for Free
Compress PDF online for free — shrink large files while keeping text readable.
Drag & drop files here, or click to browse
Max size: 500 MB
Key capabilities
- Smart, strong, and ultra compression levels
- Reduce PDF file size for email and uploads
- Works with text PDFs and many scanned documents
- Automatic temporary file deletion after processing
How to use
- Upload your PDF file.
- Choose Smart, Strong, or Ultra compression.
- Click Process and wait for compression to finish.
- Download the smaller PDF. Temporary files are deleted automatically.
How this tool works
- You upload a PDF to our processing server over HTTPS.
- The compressor re-encodes embedded images, removes redundant objects where safe, and rebuilds the PDF.
- You download the smaller file. The upload and result are deleted after download or timeout.
Recommended settings
- Smart — everyday documents and email attachments
- Strong — when you need a much smaller file and slight image softening is OK
- Ultra — maximum size reduction for archival or strict upload limits (e.g. aiming near 1 MB)
- Prefer Smart first; only move to Strong/Ultra if the file is still too large
Supported formats
PDF (.pdf)
File size and limits
- Upload size follows site admin limits (commonly up to tens of MB).
- Password-protected PDFs must be unlocked before compression.
- Already heavily compressed PDFs may shrink only a little.
Privacy
Uploads are processed on secure servers and are not kept permanently. Files are removed after you download the result or after the retention window (default 30 minutes). We do not sell document contents.
Common use cases
- Shrink a PDF to meet email attachment limits
- Reduce PDF size to about 1 MB for government or school portals
- Compress scanned PDF packets before sharing
- Make multi-page reports faster to download on mobile
How to Compress a PDF Online
Upload your PDF, choose a compression level, click Process, then download the reduced file. No desktop software is required. For best results, start with Smart compression and only increase strength if you still need a smaller file.
Choose the Right PDF Compression Level
Smart balances size and clarity for most office documents. Strong further reduces image-heavy PDFs. Ultra targets the smallest size when portals enforce strict limits — expect more softening on photos and scans. Text-heavy PDFs often shrink less than image-heavy ones because fonts and vectors are already efficient.
How to Compress PDF Without Losing Quality
Use Smart compression first. Avoid Ultra unless necessary. If quality must stay near-original, compress only oversized embedded images at the source, remove unused pages with Split PDF, then run Smart compression. Always spot-check a page with fine print or signatures before sending the final file.
How PDF Compression Works
PDF compression reduces file size by optimizing embedded images, fonts, and redundant data while preserving essential content and layout. Image downsampling and re-encoding usually deliver the largest savings. Structural cleanup removes unused objects. The readable document remains a standard PDF you can open in any reader.
Is It Safe to Upload a PDF?
Yes when you use a reputable HTTPS tool with temporary storage. Daily Toolkits processes files for the conversion only, then deletes them after download or timeout. Do not upload documents you are forbidden to transmit; for highly sensitive files, prefer offline tools on a trusted computer.
Common PDF Compression Problems
Little size reduction usually means the file was already optimized. Timeout errors mean the file is too large or complex — try fewer pages. Blurry scans after Ultra mean you should re-run with Smart. Password-protected PDFs need to be unlocked first.
Troubleshooting
File barely got smaller
The PDF may already use efficient compression, or it is mostly vector text. Try Strong/Ultra, or compress source images before creating the PDF.
Text looks blurry after Ultra
Use Smart or Strong instead. Ultra prioritizes size over image sharpness on scanned pages.
Upload rejected
Confirm the file is a real PDF, under the max upload size, and not corrupted. Try re-exporting from the original app.
FAQ
Do you store my files?
No. Files are processed temporarily and automatically deleted. We never permanently store your uploads.
How long are files kept?
Files are deleted after you download the result or after a short timeout (default 30 minutes), whichever comes first.
Will compression reduce quality?
Smart keeps good readability for most documents. Strong and Ultra shrink more and may soften images or scanned text. Always preview before sending important files.
How do I reduce a PDF to about 1 MB?
Try Strong or Ultra compression. If the file is still large, remove unused pages with Split PDF, or compress image-heavy pages at the source, then compress again.
Can I compress a scanned PDF?
Yes. Scanned PDFs are image-heavy and often shrink the most. Start with Smart; use Strong/Ultra if you need a stricter size limit.