How to compress a PDF file online
Large PDFs can be slow to email, difficult to upload to web forms, or waste storage space. Compression reduces the byte size of your document without altering its written contents.
What gets compressed?
Our client-side compressor uses pdf-lib to eliminate unreferenced objects, compress font tables, and deduplicate streams. This targets the primary bloat found in documents created via Word exports or virtual PDF printers.
Selecting a quality level
- Small Size — aggressive stream packing. Best for documents intended for web upload or email attachments.
- Balanced — ideal balance between file reduction and compatibility across older PDF viewers.
- High Quality — minimal re-encoding. Best when preserving maximal structure is prioritized.