Compress PDF

Compress PDF online for free — reduce file size quickly.

Compress PDF Tool

Reduce your PDF file size easily without losing quality. Select a PDF below to get started.

Choose PDF

About Compress PDF

Compress PDF online for free. Shrink oversized PDFs for email attachments and uploads. We process your file, return the smaller PDF, and do not keep your uploads.

How to compress a PDF

1
Upload PDF
Choose one or more PDF files to compress.
2
Set target size
Enter your preferred target size in KB.
3
Compress and download
Click Compress and Download to save the smaller PDF.

When to compress a PDF

Compress a PDF when email rejects the attachment, a portal has a size cap, or you need faster uploads on a slow connection. Compression trades some visual detail for a smaller file—so keep an uncompressed copy if you need print-ready quality.

Shrink files for Gmail or Outlook size limits
Meet government or school upload caps
Share large scan-heavy PDFs more easily

Getting a good balance

Try a moderate target size first. If the PDF is still large, lower the target gradually and compare readability. Text-heavy pages usually survive compression better than photo-heavy pages.

We process your PDF, return the smaller file, and do not keep your uploads.

Frequently asked questions

Is Compress PDF free to use?▾

Yes. You can use Compress PDF online for free on DTools — no account required for standard conversions.

Do I need to install software for Compress PDF?▾

No. Compress PDF works in your browser. Upload your file, convert, and download the result.

Do you store my files?▾

No. We process your file to complete the request, return the result for download, and do not keep your uploads. We do not sell your files or publish them for others to browse.

Is there a file size limit for Compress PDF?▾

Very large files may take longer or fail depending on your device and connection. For best results, start with a typical document or image size and split oversized batches if needed.

Will compressing reduce PDF quality?▾

Compression re-encodes pages to shrink file size. Higher compression usually means smaller files with some quality loss. Start with a higher target size for better quality.

When should I compress a PDF?▾

Compress when a PDF is too large for email, a form upload, or sharing on slow connections. Leave higher quality for print or archival copies.