Home / PDF Compressor
Need to send a PDF by email or upload it to a form? Try reducing its file size here. The tool works in your browser, and the result will depend on how the original PDF was made.
The tool loads your PDF, clears common document metadata fields (such as title, author, subject, keywords, producer and creator) and re-deflates eligible uncompressed data streams. It does not remove all embedded metadata, thumbnails or revision history. Honest note: if your PDF is mostly scanned images that were already JPEG-compressed, there's little left to squeeze — for those, exporting the scan at a lower DPI is the real fix.
Choose a PDF and let the browser process it, then save the compressed result and compare its size with the original. Results depend on how the PDF was created. A document containing uncompressed streams or excess metadata may shrink, while a PDF made mostly from already-compressed photographs may change very little.
PDF files can contain text, vector graphics, fonts and images. Many image-heavy PDFs already use JPEG or other compression, so running another pass cannot remove much data without reducing image resolution or quality. If a scanned document is still too large, consider scanning at a suitable DPI, resizing images before creating the PDF, or using an image-aware PDF optimizer.
This tool processes the selected document in your browser rather than sending it to a Fileswin upload server. Keep a copy of the original, especially for legal, financial or business documents. After compression, open the output and check that all pages, fonts, links and images remain readable. Do not use an online tool for sensitive documents unless its processing and privacy practices meet your requirements.
No. Already-optimized PDFs may see little or no reduction, and some files can even become slightly larger after rewriting.
This tool may reduce uncompressed data, but image-heavy scans often need image resizing or recompression for a substantial reduction.
The tool is intended to rewrite and optimize the PDF, but you should always inspect the output before relying on it.
HEIC to JPG converter · File hash checker · All Fileswin tools
If you need more than a quick browser-based reduction, compare dedicated PDF editors for Windows for tasks such as editing text, annotating documents and managing pages. For files that need to be packed into an archive before sharing, 7-Zip for Windows is another useful option. You can also browse GramFile’s Windows file compression software guide to compare other utilities.
A PDF may contain text, vector artwork, fonts and raster images. Recompressing existing streams can help when a file contains data that is not efficiently compressed, but already-optimized PDFs may show little or no reduction. Always compare the original and output file sizes.
Scanned PDFs are often large because each page contains an image. This tool's stream-level optimization may not substantially reduce image-heavy documents. For a much smaller scan, lower the scan resolution or image quality before creating the PDF, then inspect the result for legibility.
Browse related pdf tools.