Compress PDF
Make your PDF smaller to share.
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About Compress PDF
Compress PDF makes your PDF file smaller so it is easier to send and upload. Large scans and PDFs full of photos can be too heavy for email or slow to share. This tool reduces the size while keeping your pages readable. It runs in your browser, so your file is never uploaded, and it is free.
Use it before you email a report, attach a document to a job application or send papers over WhatsApp. If a website asks for a file under an exact size, such as 200KB or 500KB, use Compress PDF to Size instead, which aims for the number you set.
How to use Compress PDF
- Open the PDF you want to make smaller.
- Start the compression.
- Download the smaller PDF.
Why use PDF Hydra
- Smaller filesReduce file size so PDFs are easier to email and share.
- Readable pagesYour text and images stay clear enough to read.
- No uploadCompression happens in your browser and the file stays on your device.
- Works on phoneCompress a PDF on your mobile without installing an app.
Frequently asked questions
How do I reduce the size of a PDF?
Open your PDF in Compress PDF, start the compression and download the smaller file. You can then email or upload it more easily.
How do I compress a PDF to exactly 100KB or 200KB?
Use Compress PDF to Size. You set the target, such as 100KB or 200KB, and the tool aims for that size.
Is it safe to compress private documents here?
Yes. The tool runs in your browser and your file is never uploaded to a server.
Why did my file not get much smaller?
PDFs that are mostly plain text are already small and cannot shrink much. Files with big photos or scans usually shrink more.