Free Online PDF Compressor

Large PDFs cause problems in nearly every workflow. Email providers like Gmail and Outlook reject attachments over 25 MB. Uploading a 50 MB report to a client portal or Google Drive takes time and eats storage. On mobile, slow-loading PDFs frustrate readers who lose patience before the document even opens.

Shrinking your PDF before sharing solves all of this. Our compressor works by removing redundant internal data, stripping unnecessary metadata, and consolidating stream objects — without re-encoding your text, images, or layout. The result is the same readable document at a smaller file size.

This tool uses pdf-lib, an open-source JavaScript library, to read and restructure your PDF entirely in your browser. It removes duplicate objects, compresses internal object streams, and strips metadata that accumulates from editing software. The original visual content — your text, images, and formatting — is not affected.

Because all processing happens locally, your document is never sent to a server. This makes the tool safe for confidential reports, legal documents, financial statements, or any PDF you'd rather not upload to a third-party service.

Remove pages you don't need before compressing. Fewer pages means less content to process, and you'll get a proportionally smaller output. Use our Split PDF tool to remove unwanted pages first.

If your PDF was created from a Word or PowerPoint file, compression tends to work better because those formats embed a lot of redundant internal data that the compressor can strip out.

PDF compression works best as part of a complete document workflow. If your PDF contains many embedded images, prepare them first using our image resizer to scale photos to appropriate dimensions before they are added to the document — smaller source images mean a dramatically smaller PDF even before compression is applied. Our image to WebP converter can also reduce embedded image sizes by up to 35% before you build the PDF. For PDFs that originated from a collection of photos, use our image to PDF converter to rebuild the document from optimized source images instead of compressing a bloated original.

Once your PDF is compressed, our PDF merger lets you combine it with other documents into a single compact file, while our PDF splitter extracts only the pages you need to share — keeping attachments as small as possible. Our PDF page numberer adds professional page numbers before final distribution. If you need to extract the images from a compressed PDF for reuse, our PDF to image converter exports each page as a high-quality JPG or PNG, which you can then run through our EXIF remover to strip any embedded metadata before sharing.