Scanned documents and PDFs full of photos are often too heavy to send by email or to upload to an administration website. The Helpdf compressor re-encodes each page as an optimized image to drastically reduce the size. Choose the level that best balances quality and file size.
How to compress a PDF
Select your file
Click the button or drag and drop your file into the box.
Choose your options
Adjust the settings if needed — the defaults work for most files.
Download the result
Your new file is created instantly in your browser. Click Download.
Frequently asked questions
How much smaller will my PDF be?
Scanned and image-heavy PDFs are often reduced by 50 to 90%. If the result would be larger than the original, Helpdf keeps your original file.
Are my files safe?
Yes. With Helpdf, your files stay on your device. They are never sent to our servers, nobody else can see them and nothing is stored.
Is Helpdf free?
Yes, every tool is completely free with no sign-up and no watermark. The site is funded by advertising.
Does it work on phone?
Yes. Helpdf works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux. Very large files may be slower on older phones.