How to Compress a PDF Online
Reducing PDF size makes documents easier to upload, email, share, and store. Use this free online PDF compressor in three simple steps.
1. Upload your PDF
Select a PDF document from your computer, tablet, or mobile device.
2. Select compression
Choose low, medium, or high compression depending on your quality and file-size requirements.
3. Download your PDF
Start compression, review the file-size comparison, and download your optimized document.
Understanding PDF Compression Levels
Different documents require different compression settings. Scanned documents containing photographs may benefit from stronger image compression, while documents intended for printing may require higher image quality.
Low PDF Compression
Low compression uses the Ghostscript printer preset. It is suitable when preserving image detail is more important than achieving the smallest possible file size.
Medium PDF Compression
Medium compression uses the ebook preset and offers a balance between document quality and file size. It is a useful starting point for business documents, reports, and everyday PDFs.
High PDF Compression
High compression uses the screen preset to reduce embedded image resolution and file size. It can be useful for online sharing, but photographs and scanned pages may lose detail.
Why Compress PDF Files?
Smaller email attachments
Reduce document size before attaching files to emails or sending them to colleagues.
Faster uploads
Smaller documents can be easier to upload to websites, online forms, and document management systems.
Save storage space
Optimized PDF documents can help reduce the storage space required for your files.
Convenient sharing
Smaller PDFs are generally easier to transfer and download, especially on slower connections.
Frequently Asked Questions
1. Is this PDF compressor free?
Yes. This online tool can be used without purchasing desktop software or installing a PDF application.
2. Will compressing a PDF reduce its quality?
It can. Stronger compression may reduce the resolution and quality of embedded images. Text and vector elements may remain sharp, but always inspect the result.
3. Which compression level should I choose?
Medium compression is a good starting point for most documents. Choose low compression when image quality matters and high compression when file size is the priority.
4. Can every PDF be compressed?
Most ordinary PDFs can be processed, but the amount of size reduction varies. Already optimized PDFs may not become smaller. Encrypted or damaged documents may fail.
5. Does PDF compression remove pages?
No. This tool optimizes the document rather than intentionally removing pages.
6. Can I compress scanned PDF documents?
Yes. Scanned documents often contain large embedded images, so image compression may significantly reduce their size.
7. Is the original PDF overwritten?
No. A separate compressed PDF is created. Your original document on your device is not modified.
8. Why is my compressed PDF larger?
Some PDFs are already highly optimized. Reprocessing them can sometimes increase their size. Try a different setting or retain the original document.
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