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Compress PDF Online

Reduce PDF file size for email, uploads, and faster sharing without sending files to a server.

🔒 All processing happens locally in your browser. Your files never leave your device.

What's Next?

After you compress a PDF, turn it into images or merge it with other documents:

Merge PDF

Combine multiple compressed PDFs

PDF to JPG

Convert compressed PDF to images

How to Compress PDF Files - Step by Step

1

Upload Your PDF

Drag and drop your PDF file or click to browse. Your file stays on your device - no uploading to servers.

2

Choose Compression Level

Select Low for best quality, Medium for balanced results, or High for maximum file size reduction.

3

Download Compressed PDF

Click compress and download your smaller PDF file. Compare the before and after file sizes.

Why Choose Our PDF Compressor?

Reduce PDF File Size Quickly

Choose a compression level based on whether you want the smallest file, the best quality, or a balanced middle ground.

Useful for Email and Upload Limits

Shrink large PDFs before sending them by email, uploading them to portals, or sharing them with clients and teammates.

Private Browser-Based Compression

Your document stays on your device while PDFKit compresses it locally in the browser.

Simple Quality Controls

Test low, medium, or high compression and compare the size savings before you download the final file.

Frequently Asked Questions

Upload your PDF, choose a compression level, and click Compress PDF. PDFKit creates a smaller version in your browser that you can download immediately.
It can affect image-heavy PDFs depending on the level you choose. Low compression keeps the best quality, while high compression aims for the smallest file.
Scanned PDFs and image-heavy documents usually shrink the most. Text-heavy PDFs often compress less because they are already lightweight.
Yes. PDFKit compresses your PDF locally in the browser, so the file never needs to be uploaded to an external service.
Yes. You can compress PDFs for free, and Pro is there if you need larger file support and a smoother heavy-use workflow.

Private PDF workflow

What this Compress PDF tool is best for

Use PDFKit to make large PDFs easier to email, upload, and share. The compressor runs in your browser and gives you quality controls before download.

Common use cases

  • Email attachment limits
  • Government or university upload portals
  • Scanned PDFs with large images
  • Client reports that need a smaller file

Formats and privacy

Input: PDF. Output: compressed PDF.

The PDF is processed locally in the browser, so document contents do not need to be uploaded to a server.

Things to check before sharing

  • Text-only PDFs may not shrink much because they are already compact.
  • High compression can reduce image sharpness.
  • Password-protected PDFs may need to be unlocked first.

Related PDF tools

Merge PDFPDF to JPGSplit PDF