Compress PDF Online, Free
Reduce your PDF file size in seconds — pick a compression level, or enter an exact target size in KB. No sign-up, and your files are never uploaded to a server.
How to compress a PDF
Add your file
Click the box above or drag and drop the PDF you want to shrink.
Choose compression
Pick High, Medium, or Low — or enter an exact target size in KB.
Compress & download
Tap "Compress" and download the smaller PDF straight to your device.
Why use this tool
Most online PDF compressors send your file to a remote server, which can be slow and raises privacy concerns for personal or official documents. This tool runs entirely inside your browser — your file is read, compressed, and saved on your own device, and is never transmitted anywhere. That also means it keeps working even on a modest internet connection, with no limit on how many times you can use it. A target-size option is also included, useful when a form or email attachment enforces a strict upload limit.
Frequently asked questions
Yes. The tool is completely free, with no limit on the number of times you can use it and no sign-up required.
No. Every file is processed locally inside your own browser using JavaScript. Your PDFs never leave your device.
Yes. Enter a target size in KB and the tool will automatically try a series of compression settings until it reaches that size or gets as close as possible.
This tool converts each page into a compressed image, so file size drops a lot, but text is no longer selectable or searchable afterward. Visual quality depends on the level you choose.
Choose High for the smallest file, ideal for email or upload limits. Choose Low to keep the best visual quality. Medium is a balanced default for most documents.