How does compression work?

We rasterize each page of your PDF into an image at the quality you choose, then rebuild a new PDF from those images. This reduces file size significantly, especially for image‑heavy PDFs.

Why is the compressed file sometimes larger?

If your original PDF already uses efficient compression (e.g., vector text or black‑and‑white scans), converting to JPEG images can increase size. Try a higher quality setting (70‑90%) or use a different tool for text‑heavy PDFs.

PDF Compressor (Reduce File Size)

Upload a PDF, choose JPEG quality, and download a compressed version. All processing happens in your browser – private and secure.

or drag & drop PDF here

Supports PDF files only

Compress PDF files online securely and privately

Our PDF Compressor tool helps you reduce the file size of your PDF documents quickly and securely, directly in your browser. Whether you need to share files via email, upload documents to websites, or save storage space, this tool makes PDFs smaller without complicated settings or software installation. Unlike many online compressors, your files are never uploaded to a server. Everything is processed locally on your device to ensure complete privacy and security.

How PDF compression works

This tool reduces PDF size by rasterizing each page into a compressed JPEG image based on the quality level you choose, then rebuilding a new optimized PDF. This method works especially well for scanned documents, image-based PDFs, and photo-heavy files. Text-heavy PDFs may see smaller reductions, but the file size can still be significantly improved depending on the selected quality level.

Reduce file size without losing usability

Large PDF files can be difficult to upload, send, or store. Compressing them makes sharing faster and more efficient while maintaining readability. This is useful for students submitting assignments, professionals sending reports, and anyone managing digital documents.

By lowering file size, you can speed up uploads, meet file size limits, and save valuable storage space on your device or cloud services.

100% private and secure processing

Your privacy is our highest priority. This PDF compressor uses modern browser technology along with powerful pdf.js and pdf-lib libraries to process documents directly on your device. Your files never leave your computer, ensuring full confidentiality. There are no uploads, no tracking, and no risk of your documents being stored online.

Adjust quality for the perfect balance

You can control the compression level using the quality slider. Lower quality produces smaller file sizes, while higher quality preserves more visual detail. This flexibility allows you to choose the ideal balance between size and clarity based on your needs.

Fast, simple, and unlimited

Compression happens instantly within your browser. There are no file size limits, no watermarks added to your documents, and no registration required. Simply upload your PDF, adjust the quality level, and download your optimized file within seconds.

Perfect for everyday use

This PDF compression tool is ideal for reducing scan sizes, optimizing documents for email attachments, shrinking reports for web uploads, saving cloud storage space, and preparing files for fast sharing across devices.

How to compress a PDF

To compress your file, upload the PDF, adjust the quality slider to your preferred level, and click the Compress button. Your smaller, optimized PDF will be ready to download instantly.

With this privacy-first PDF compressor, you can reduce file sizes quickly, securely, and without limitations — all directly from your browser.

PDF Compressor vs Other Online Tools

Unlike many online PDF compressors that require file uploads, DocUpLift processes everything directly in your browser. This means no waiting for server processing, no upload limits, and no privacy risks. Your files remain fully under your control at all times.

If you need to split large documents before compressing, try our PDF Split tool. You can also combine multiple files using our PDF Merge tool or convert images first using our Image to PDF tool.