Upload a PDF and this tool rewrites its internal structure and strips unnecessary metadata to reduce file size, entirely in your browser.
This tool rewrites the internal structure of your uploaded PDF directly in your browser. It groups scattered document objects into compressed object streams, and strips authoring metadata, edit history, and unused objects. All of this happens in JavaScript running locally β the file is never sent to a server.
Server-side PDF compression tools can dramatically shrink files by re-encoding or downsampling embedded images. This browser-based tool does not touch images at all β it only cleans up document structure and metadata. That means gains on image-heavy scanned PDFs can be small, while text-heavy documents with a lot of accumulated edit history tend to benefit more.
PDFs exported from Word, PowerPoint, or Illustrator often carry edit history, duplicated font subsets, unused objects, and verbose metadata. Files bloated this way can shrink noticeably with structural cleanup alone. Conversely, already-optimized PDFs or scans dominated by high-resolution images may see little to no reduction.
Your PDF is opened and processed entirely in browser memory and is never uploaded to a server. Once compression finishes, the result downloads directly to your device β neither the original nor the output is stored anywhere externally. Compression even works offline once the page has loaded.