Free Online Compress PDF
Reduce PDF file size while maintaining quality
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About this tool
Reduce PDF file size with this free online PDF compressor. Choose from quality presets to balance file size and visual quality. The tool strips unnecessary metadata, optimizes internal structures, and reduces the overall file size — all in your browser with no server upload. Ideal for emailing large PDFs, uploading to portals with size limits, or archiving documents. Works on any device with no signup required.
How to use Compress PDF
- Upload PDF. Click the upload area or drag and drop your PDF file.
- Compress. Click Compress to optimize the file.
- Download. Download your compressed PDF.
Frequently Asked Questions
The tool removes unnecessary metadata, unused objects, and duplicate resources from the PDF structure. It optimizes the internal file format to reduce size while preserving the visible content.
The basic compression removes metadata and optimizes structure without affecting visual quality. The reduction depends on how much metadata and redundancy the original file contains.
Results vary depending on the original file. PDFs with lots of metadata, form fields, or redundant objects may see 10-40% reduction. Already-optimized PDFs may see minimal change.
No. All compression runs locally in your browser. Your files never leave your device.
There is no hard limit, but very large files may be slow to process in the browser. For best results, keep files under 100MB.
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