How to Compress a PDF

Why Compress a PDF?

PDF files can become very large when they contain high-resolution images, embedded fonts, or complex graphics. Compressing a PDF reduces its file size, making it easier to:

Attach to emails (most email services have a 10–25MB limit)
Upload to websites or online forms
Share via messaging apps
Store more files on your device

Step-by-Step: How to Compress a PDF with DartPDF

Open the Compress PDF tool

Go to the DartPDF Compress PDF tool. No sign-up or account required.

Upload your PDF file

Drag and drop your PDF onto the upload area, or click to browse your files. Maximum file size is 50MB.

Choose a compression level

Select Light (removes metadata), Medium (recompresses images), or Extreme (converts images to JPEG at 150 DPI for maximum reduction).

Click Compress

The tool processes your PDF entirely in your browser. You will see the original size, compressed size, and percentage saved.

Download your compressed PDF

Click the Download button to save your compressed PDF. The file is ready to use immediately.

Compression Levels Explained

Light

Removes metadata and unused objects. Preserves full image quality. Best for documents you want to keep sharp.

~5–20% reduction

Medium

Recompresses images and optimizes fonts. Good balance of size and quality.

~20–50% reduction

Extreme

Converts images to JPEG at 150 DPI. Maximum file size reduction. Best for sharing via email.

~50–80% reduction

DartPDF uses browser-first processing. A processed file may be securely uploaded when needed to complete a paid download.