Compress PDF
Reduce PDF file size while maintaining quality.
Compress PDF Files Online for Free
Large PDF files can be a headache when sharing via email, uploading to portals, or storing on limited drives. Our Compress PDF tool reduces file size by stripping unnecessary metadata, optimizing internal structures, and re-encoding the document efficiently — all while preserving the visual quality of your pages.
How Compression Works
When a PDF is created, it often contains duplicate objects, unused fonts, and verbose metadata that inflate the file size. Our compressor parses the document, removes redundancies, and rewrites it in a more compact form. The result is a smaller file that looks identical to the original when viewed or printed.
100% Browser-Based and Private
Your file never leaves your device. The compression runs entirely in your browser using WebAssembly and JavaScript, so there is no upload, no server processing, and no risk of your data being intercepted or stored. This is especially important for sensitive documents like tax returns, contracts, and personal records.
When to Compress a PDF
Email providers typically limit attachments to 10-25 MB. Job application portals and government forms often have even stricter limits. Compressing your PDF before submission ensures it meets size requirements without splitting the document or reducing image quality manually. It is also useful for archiving large collections of documents to save disk space.