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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, reducing 10-30%), medium compression (slight image quality loss, reducing 30-60%), and strong compression (significant image quality reduction, reducing 60%+). The 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. Remove unused objects and metadata simultaneously. All done locally in the browser.
Suitable for reducing the size of large PDF files before sending via email or instant messaging, or compressing scanned documents and archiving them. Be aware that compressed scanned parts may affect the readability of text.
PDF compression tool to reduce the size of PDF files, support adjustment of image quality and removal of redundant data, processed locally by the browser.