Compress PDF
Reduce PDF file size while maintaining quality.
Drag & drop a PDF file here
or tap to select file
Tap anywhere to browse
How to Compress a PDF
Step 1
Upload your PDF
Drag and drop your PDF file or tap to browse. No sign-up required.
Step 2
Choose compression
Pick a preset level or set a custom target file size in MB or KB.
Step 3
Download compressed PDF
Click compress and download your smaller PDF instantly.
Why Use ModifyPDF to Compress PDFs?
100% Private
Your files are processed securely and never stored on our servers.
Target File Size
Unlike other tools, you can set an exact target size in MB or KB.
Fast Compression
Compress large PDFs in seconds directly in your browser.
Works on Mobile
Fully optimized for phones and tablets — no app download needed.
Completely Free
No watermarks, no sign-up, no limits. Just upload and compress.
Preserves Quality
Smart compression keeps text sharp and images readable.
Frequently Asked Questions
How much can I compress a PDF?↓
It depends on the content. PDFs with images can be compressed by 50–90%. Text-only PDFs compress less, typically 10–30%.
Will compressing a PDF reduce its quality?↓
Minimal and Recommended presets preserve quality well. Strong and Maximum presets reduce file size significantly but may make images slightly less sharp.
Is there a file size limit?↓
ModifyPDF supports PDFs up to 100MB. For most documents this is more than enough.
Is my PDF safe when I upload it?↓
Yes. Your file is processed entirely on our secure servers and deleted immediately after conversion. We never store or share your files.
Can I compress a PDF on my phone?↓
Absolutely. ModifyPDF is fully optimized for mobile browsers on both iOS and Android — no app required.
What is target file size compression?↓
Instead of choosing a quality level, you specify an exact output size (e.g. 2 MB). Our tool automatically adjusts compression to hit that target.
ModifyPDF — Free online PDF tools. No sign-up required.