How to Compress a PDF File Online

Free, step-by-step guide. No signup needed — everything runs in your browser.

Open the PDF Compressor

Navigate to the tool page. No account or login required.

Drag and drop your PDF file or click to select it from your device.

Select your preferred balance between file size and quality. Higher compression means smaller files with slightly reduced image quality.

Save your compressed file. The tool shows you exactly how much space you saved.

For email attachments, most providers have a 25MB limit. Compress PDFs to stay well under this threshold.
PDFs with lots of high-resolution images benefit most from compression — you can often reduce size by 60-80%.
Text-heavy PDFs are already small and may not compress significantly further.
The tool preserves text quality perfectly — only embedded images are compressed.

Reduce PDF file size instantly. Free, no signup, 100% private.