How it works
Open your PDF in CrabPDF.
Open the Compress panel in the right sidebar.
Choose Light, Medium, or Strong compression.
Apply compression and keep editing or download the result.
Compression levels
Light keeps more quality, Medium balances quality and size, and Strong aims for the smallest file. Results depend on the original PDF, especially embedded images.
Related tools
Merge PDFs · Reorder pages · Inspect PDFs · Protect with password
Privacy-first
Compression runs locally in your browser. Once CrabPDF is loaded, you can turn off Wi-Fi and keep working with cached tools.