Reduce PDF file size
Make PDFs smaller for upload, email, and sharing.
Compress PDF
Compress PDF files online for free
Reduce PDF file size while preserving as much clarity as possible, making documents easier to share, upload, and store.
One PDF fileAdjustable compressionPreview compression resultBrowser local processing
Select PDF file
Drop a PDF file here
or
Supports one PDF file
Files are processed locally in your browser and are never uploaded to a server
Keep reading quality
Optimize file size while keeping document content clear.
Fast PDF compression
Compress PDF files quickly without complex steps.
Fits common workflows
Useful for email, file submission, sharing, and archiving.
How to Use PDF Compressor
1、Upload PDF file
Choose the PDF document to compress.
2、Compress
Optimize the PDF file size.
3、Download file
Save the compressed PDF document.
Why Use PDF Compressor
Fix oversized PDFs
Reduce PDF file size for easier storage and transfer.
Avoid email limits
Compress PDF attachments to reduce failed sends.
Improve upload speed
Smaller files are easier to upload to websites.
Share and save files
Compressed documents are easier to share and keep.
Use Cases
Compress PDF attachments before sending.
Website upload
Reduce file size to meet upload limits.
Office sharing
Compress large PDF reports and contracts.
Study files
Reduce storage for PDF course materials.
Tips
- Keep the original PDF before compression.
- Large PDFs may take longer to process.
- Scanned PDFs may compress differently.
- Image-heavy PDFs often reduce more size.
Processing is completed locally, and files are not uploaded to the server
Related Tools
Frequently Asked Questions FAQ
PDF compression reduces the size of a PDF file while trying to keep the document readable. A compressed PDF is easier to email, upload, share, and store, especially when the original file contains large images or scanned pages.
Large PDFs can fail as email attachments, exceed website upload limits, or take longer to share. Compressing a PDF reduces file size so the document is easier to send, upload, save, and open across different devices.
PDF compression optimizes the document based on its content and usually tries to preserve the reading experience. PDFs with many images or scans may show slight quality changes, so it is best to review the downloaded file before submitting it.
To compress a PDF online, upload the file you want to reduce, let the tool optimize the size, and download the compressed PDF. The result can be used for email, website uploads, sharing, or archiving.
FastToolAI processes PDF compression in your current browser and does not upload the document to the server. For contracts, certificates, study files, or personal documents, review the downloaded file and store it carefully after processing.
The PDF compressor supports common PDF documents, including files exported from office apps, image-based PDFs, and scanned PDFs. Compression results vary by content, and image-heavy or very large PDFs often have more room to reduce size.