Reduce your PDF file size instantly — no upload, no account, runs entirely in your browser.
PDF compression reduces file size by stripping embedded metadata, revision history, creator information and redundant data that accumulates in PDFs from various applications. The result is a leaner file that attaches faster in emails, uploads quicker to cloud services and takes less storage — without any visible change to content, fonts or images. Everything runs in your browser using pdf-lib.
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PDF compression reduces file size by stripping embedded metadata — author names, keywords, creation tools, revision history and other hidden data that adds weight without adding value. OneConvert uses pdf-lib with object stream compression (equivalent to PDF/1.5 compression) to pack the remaining data more efficiently.
Results vary by PDF: documents heavy with metadata can shrink significantly, while already-optimised PDFs may see smaller reductions. Image-heavy PDFs require deeper compression (resampling images) which is a server-side operation. For those, use our compress tool to remove metadata first, then open in your PDF viewer to reduce image quality.