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Compress PDF
Re-save to try shrinking size via object-stream compression. pdf-lib does not re-encode images, so the reduction may be limited — the result is reported honestly.
About this tool
Compress PDF is a free online tool. Shrink PDF file size for easier sharing.
After uploading the PDF file, select the compression level: light compression (retaining image quality and reducing by 10-30%), medium compression (slightly reducing image quality and reducing by 30-60%), and strong compression (significantly reducing image quality and reducing by 60%+). This tool displays a comparison of file sizes before and after compression. Download the new file after the compression is complete.
PDF compression is mainly achieved by reducing the resolution and quality of embedded images. Text content will not be compressed. The tool uses pdf-lib to parse PDFs, identify embedded picture objects, and re-encode them into lower-quality JPEG. Delete unused objects and metadata simultaneously. All of this is done locally in the browser.
Ideal for reducing the size of large PDF files before sending via email or instant messaging, or compressing and archiving scanned documents. Please note that compressed scanned portions may affect the readability of text.
PDF compression tool, which can reduce the size of PDF files, supports adjusting image quality and deleting redundant data, and is processed locally by the browser.