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Compress PDF
Reduce your PDF file size online for free. Remove metadata and optimise structure to make PDFs easier to share and email.
Drag & drop your PDF here
or click to browse
Original size
New size
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How to Compress a PDF
- Click Choose PDF or drag a PDF file into the box above.
- Adjust the compression level slider — move left for a smaller file, right for better quality.
- Click Compress PDF and wait a moment.
- Download your compressed PDF.
How does PDF compression work?
FileKit removes unnecessary metadata, embedded thumbnails, duplicate data, and optimises the PDF object structure — all inside your browser. For PDFs containing high-resolution images the size reduction can be significant.
Frequently Asked Questions
Will quality be affected?
The text and vector graphics in your PDF are not changed. Embedded images may be slightly reduced depending on the compression level you choose.
Are my files safe?
Yes. Your PDF never leaves your device. All processing happens in the browser with no server upload.
What is the maximum file size?
There is no hard limit — just your browser's available memory. Files up to several hundred MB are typically handled without issues.