How to Compress a PDF on iPhone

Large PDF attachments can be difficult to send from an iPhone. LUMIXA lets you choose a PDF from the Files app, optimize it in the browser, compare the result, and download the smaller copy without installing a separate app.

Open the PDF Compressor, choose your document, wait for local processing to finish, and check the original and optimized sizes before downloading. For private documents, keep the file on your device and avoid sharing it with unknown services.