What this does
Large PDFs take long to send on WhatsApp and use up mobile data for you and for everyone in the group. Scanned pages and phone photos are usually the heaviest.
Compress PDF makes the pictures inside lighter and keeps the text sharp, so the file still reads well on a small screen.
Tips
- Choose "Balanced" for documents you will also print; choose "Smallest" for quick sharing.
- Scanned in colour but only text on the page? Black & white scans are much smaller.
- Sending to a group? Smaller files open faster for people on slow networks.
How to use it
- Add your PDF
- Pick a level or type a target size
- Download the smaller PDF
Questions people ask
Will the text stay readable?
Yes. Text and lines stay sharp; only pictures inside the PDF are made lighter. Check the result once before sending.
Is my PDF sent to a server to compress it?
No. It is compressed on your phone. Nothing is uploaded.
What is the difference between Smart and Exact?
Smart shrinks the pictures inside your PDF and keeps text crisp. Exact turns each page into an optimised image so it can reach almost any size you type.
Why did my PDF barely shrink in Smart mode?
Text-only PDFs are already small. Use Exact mode if a portal demands a specific size.
Is Compress PDF really free?
Yes. Every PDFtoOne tool is free with no login, no daily limit and no watermark. The site is supported by ads.
Is there a file size limit?
We set no limit. Files are processed by your own device, so the only limit is its memory. Computers handle very large files; phones handle most everyday files easily.
Does it work offline?
Yes. Once you have used a tool, it keeps working without internet. You can also install PDFtoOne as an app.