Compress PDF — Reduce File Size Online

Reduce your PDF file size by removing metadata and optimizing the internal structure.

How It Works

  1. 1Upload your file by dragging it into the drop zone or clicking to browse.
  2. 2Adjust the quality slider to balance file size and visual fidelity (optional).
  3. 3Click Download to save your converted file.

About Compress PDF

PDF files can be large due to embedded metadata, unused objects, and unoptimized structure. This tool strips metadata (title, author, subject, keywords) and uses object streams to reduce the file size. It works best on PDFs with bloated metadata or redundant internal objects. Everything runs in your browser using pdf-lib.

Frequently Asked Questions

How much smaller will my PDF get?

Results vary. PDFs with lots of metadata or redundant internal objects see the biggest reduction. Heavily optimized PDFs may not shrink much. The tool shows the before and after file sizes.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and the Canvas API. Your files never leave your device — there is no server, no upload, no cloud processing.

Does compression reduce image quality?

This tool focuses on structural optimization (removing metadata, using object streams). It does not re-compress embedded images, so visual quality is preserved.

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