How to Compress Large PDF Files Without Losing Text Quality

The Email Attachment Challenge

Many email clients enforce a strict 20MB or 25MB limit on attachments. If you have a scanned document filled with high-resolution images, your PDF can easily exceed this limit. Compressing the PDF is the only way to send it, but you don't want to make the text unreadable.

How Local PDF Compression Achieves Great Results

PDF compression works by optimizing and resizing embedded images, while keeping the vector text elements untouched. Our client-side Free Online PDF Compressor rescales images in the browser using canvas APIs. This allows you to choose your desired compression level and see the size savings immediately.

Tips for Optimizing PDF File Size

1. Avoid using overly high resolutions when scanning documents (150-200 DPI is usually plenty for web reading).
2. Use vector graphics instead of raster images whenever possible.
3. Compress embedded images to reduce byte size while preserving readability.