Compress PDF
Reduce PDF file size significantly while maintaining readability. Secure client-side processing.
Upload PDF to Compress
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Max 1 file • Max 20MB
Reduce PDF file size significantly while maintaining readability. Secure client-side processing.
Drop files here to upload
or drag and drop anywhere in this area
Max 1 file • Max 20MB
Shrink PDF file size without unnecessary quality loss. Great for email attachments, web uploads, and storage savings.
Compress PDF Online is designed for everyday tasks where speed and simplicity matter. Whether you are handling a single file or working through a batch, ConvertMastery keeps the workflow straightforward with clear settings and instant downloads.
Email large PDF reports. Meet portal upload size limits. Reduce storage for archived documents. These are among the most common reasons users choose this tool on ConvertMastery.
For the best outcome, start with a high-quality source file when possible. If you are preparing images for the web, consider converting to WebP or compressing after conversion. For documents, review the output before deleting originals. When privacy matters, prefer settings that strip metadata and use browser-based processing when available.
ConvertMastery is updated regularly to support modern formats and browsers. If you need help, visit our documentation guide or browse related tools linked below. Processing is private and on-the-fly — results are not saved to our servers.
Input: PDF. Output: compressed PDF.
ConvertMastery processes files locally in your browser whenever possible. Your images, documents, and media are not uploaded to our servers for conversion or compression. This privacy-first approach keeps your data on your device and reduces exposure to third parties.
Results depend on original content. Image-heavy PDFs compress more than text-only files.