📉 PDF Size Reducer
Reduce PDF file size while keeping the best practical quality.
Upload PDF
Upload PDF
📁 Choose PDF
🖱️ Drag & Drop
Compression
Reduced PDF
Ready when you are
Upload a PDF and reduce its size.
How to Reduce PDF Size
Upload PDF
Choose a PDF or drag it into the upload area.
Adjust Quality
Choose compression level, image quality and resolution.
Reduce & Download
Start compression, review the reduced size and download the PDF.
What Can You Use It For?
Smaller PDF
Reduce large PDF files for easier sharing and storage.
Online Forms
Prepare smaller PDFs when websites impose file-size limits.
Email & Sharing
Make PDF files easier to send and upload.
Mobile Friendly
Use the reducer from phone, tablet or computer.
Privacy & File Handling
This PDF reducer performs its main processing in the browser. It does not upload the selected PDF to a OneToolBox server.
Frequently Asked Questions
Is the PDF Size Reducer free?
Yes. The tool is designed for browser-based PDF size reduction without an API key.
Does it upload my PDF?
No. The selected PDF is processed in your browser.
Will every PDF become smaller?
Not necessarily. PDFs that are already optimized may show little or no reduction.
Which compression level should I use?
Medium is a good starting point. Use High when smaller size is the priority and Low when quality matters more.
Will my original PDF be changed?
No. Your original file is not modified. A separate reduced PDF is created for download.
How It Works
Use 📉 PDF Size Reducer in a few simple steps.
1. Open the tool
Open this page and review the available options before starting.
2. Add your input
Select, enter or drop the content required by the tool, then choose the settings you need.
3. Process & download
Run the tool, check the result, make adjustments if available, and download the finished file or result.