Reduce PDF file size. Free, private, runs in your browser.
100% private — your files and text never leave your browser. All processing happens locally on your device.
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PDF compression reduces the file size of a PDF document by optimizing its internal structure. PDFs can contain embedded fonts, high-resolution images, metadata, and duplicate objects — all of which inflate file size. Compression targets these elements to make the PDF smaller while preserving the document's visual appearance and text searchability.
Many platforms impose file size limits — email attachments (typically 25MB), upload forms, document management systems, and government portals. Compressed PDFs also download and open faster, which improves the experience for recipients. For archival purposes, smaller PDFs consume less storage space without sacrificing readability.
Convertful uses the pdf-lib library to parse and reconstruct your PDF entirely in the browser. It optimizes embedded images, removes duplicate objects, strips unnecessary metadata, and streamlines the document structure. Text remains fully searchable and selectable. No server is involved — your documents stay on your device.
Yes. PDF files often contain sensitive information — contracts, financials, personal data. Convertful processes everything client-side in your browser, ensuring complete confidentiality. No upload, no cloud processing, no third-party access.
The tool optimizes embedded images, removes duplicate objects, and strips unnecessary metadata to reduce file size.
Yes. Text content is preserved. Only embedded images and redundant data are optimized.
Low re-encodes embedded JPEGs at quality 0.85 and is best for print or archival PDFs. Medium (quality 0.7) is the default — a balanced trade-off for email attachments and web sharing. High (quality 0.5) produces the smallest output and works well for photo-heavy PDFs, at the cost of visible softening on detailed images. Text, vector content, and non-JPEG images are never modified at any level.