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Compress PDF Online

Reduce PDF file size instantly. Choose a quality preset or target a specific size like "500 KB" or "1.5 MB" — free, fast, no signup.

Target Size Mode Adaptive Algorithm Secure & Private
Smart PDF Compressor
Quick preset or adaptive target-size compression

Drag & Drop your PDF here

Upload a PDF and we'll compress it using the best algorithm for your needs

Select PDF File

PDF only — max 20 MB

Files are automatically deleted after 1 hour. Secure processing. No signup required.
Uploading PDF...
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document.pdf
Compression Mode
Quality Level
🔵
Low
Best quality
Minimal reduction
🟡
Medium
Balanced quality
Good reduction
🔴
High
Max compression
Reduced images
Target File Size
Our adaptive algorithm will find the closest possible size to your target.
Quick presets:
100 KB 500 KB 1 MB 2 MB 5 MB
File is processed securely and automatically deleted after 1 hour.
PDF Compressed Successfully
Your compressed PDF is ready to download.
Closest possible compression achieved. The exact target size could not be reached while keeping a valid PDF.
—
Original Size
—
Compressed Size
—
Size Reduction
Remaining size
Download Compressed PDF
File is automatically deleted from our servers after 1 hour.

How It Works

1

Upload PDF

Select or drag your PDF. Up to 20 MB.

2

Choose Mode

Quick preset (Low/Medium/High) or set an exact target like "500 KB".

3

Compress

Ghostscript progressively reduces quality until your target is reached.

4

Download

See the size reduction stats and download your smaller PDF.

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Free Online PDF Compressor — Quick Preset or Exact Target Size

InstantToolsPro's PDF Compressor uses Ghostscript's -dPDFSETTINGS system for quick compression: Low maps to /printer (300 DPI, high quality), Medium to /ebook (150 DPI, good for email), High to /screen (72 DPI, smallest file).

Target Size Mode runs a five-step adaptive ladder — from /printer 300 DPI down to /screen 48 DPI — stopping when the output file is within your target. The closest achievable result is always returned with a clear notice if the exact target cannot be reached. All files are auto-deleted after one hour. No watermarks, no account required.