PDF Compressor

Aimed at professionals and students, this tool reduces PDF file size quickly, making sharing, emailing, and archiving large documents more efficient.

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1,956+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how PDF Compressor processes input data instantly inside your browser.

Sample Input Image dimensions: 4000 x 3000 pixels (File size: 5MB PNG)

Computed Result Output WebP Image: 1920 x 1440 pixels (File size: 350KB, 88% reduction)

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool compresses PDF files by reducing image resolutions, downsampling embedded images, and optimizing encoding to lower file size while preserving readability and layout.
Conceptually, the tool parses the PDF structure, applies a selected compression profile (low, medium, high), reposts fonts via subsetting when requested, and outputs a compact document.
Audience and value: researchers, marketers, students, and administrators who need efficient sharing, archiving, or submission of multi-megabyte PDFs.
Core features and use cases include a single-file workflow and optional batch processing, predefined presets, font subsetting, metadata handling, and size-targeting with transparent reporting for quality assessment.

Save your calculation history with a free account

How to Use

Provide inputs: Upload your PDF file.
Choose compression level: Low, Medium, or High.
Optional: set target size or preserve fonts.
Run compression: start processing.
Retrieve outputs: download the compressed PDF and review the size reduction report.
Optional: compare with the original and re-run with different settings to balance quality and size.

Frequently Asked Questions

Find Quick Answers

What happens to metadata?

By default metadata is preserved; you may disable via an option to strip metadata. The output includes a metadata status indicating what was retained or removed, helping you verify sensitivity.

Can I control the amount of compression?

Yes, via predefined levels (low/medium/high) or by specifying a target size. The tool iteratively adjusts image downsampling, color depth, and font subsetting to approach the goal while avoiding excessive degradation.

Is the tool secure for sensitive documents?

Processing occurs on secure servers; inputs are not used for training. Data retention is limited to processing; for highly sensitive material consider on-premises solutions if available.

What input formats are supported?

Only PDF inputs are supported; other formats are rejected with a clear error. Output is a compressed PDF.

Need to run multiple calculations?

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