Drop a PDF file here to compress
PDF · up to 100 MB · smaller file size
Select one PDF file to compress and make it smaller
Select one PDF file to compress and make it smaller
How to Compress a PDF Online
Select a PDF file from your device or drag and drop it into the upload area.
Choose a quality preset: Balanced (Ebook) for the best default results, or Maximum (Screen) for stronger compression.
If your PDF is encrypted, enter the password so it can be processed locally.
Click Compress and wait a moment. Your PDF is compressed in your browser, then you can download the smaller file.
Why Use UploadLess PDF Compressor
100% private
PDF compression runs locally in your browser. Your file never leaves your device.
No sign-up needed
Compress PDF files instantly with no account, no watermark, and no time limit.
Simple workflow
Choose one PDF, pick a quality preset, and download the compressed file in a few clicks.
Adjustable quality
Use Balanced (Ebook) for the best default results, or Maximum (Screen) for stronger compression.
PDF Compressor FAQ
No. PDF compression runs locally in your browser using Ghostscript powered by WebAssembly. Your PDF file never leaves your device.
You can compress PDF files up to 100 MB. Very large or image-heavy PDFs may take longer depending on your device and browser.
Yes. UploadLess lets you compress PDF files online for free with no sign-up, no watermark, and no installation required.
Select or drag and drop your PDF, choose a quality preset, then click Compress. The tool will reduce the PDF file size in your browser and let you download the smaller file.
Balanced (Ebook) is the default and works best for most PDFs. Choose Maximum (Screen) when you want stronger compression and a smaller file size.
PDF compression usually reduces file size by optimizing images and document data, so some visual quality may change. For the best balance, use the Balanced (Ebook) preset.
Yes. This tool can make PDF files smaller for email attachments, form uploads, and sharing. The final size depends on the original PDF content and the quality preset you choose.
Yes, if you know the password. Enter the PDF password before compression so the file can be unlocked and processed locally in your browser.
Yes. UploadLess works in modern browsers on Mac, Windows, iPhone, Android, and other devices. No app installation is required.
Currently, this tool compresses one PDF at a time to keep the workflow simple, private, and stable in your browser.