PDF Compressor
Compress PDF files online for free and reduce their file size while keeping the document as readable as possible. Process your PDF directly in your browser without uploading it.
What is a PDF Compressor?
A PDF compressor is an essential productivity utility that allows you to reduce the storage footprint and file size of your PDF documents while keeping text, charts, and layout structures clear and readable. Whether you are emailing client proposals, submitting university assignments, uploading tax paperwork to strict government portals, or saving storage space, optimizing your PDF makes sharing effortless.
Uncompressed PDFs often contain heavy 300+ DPI images, embedded color profiles, duplicate metadata structures, and uncompressed stream dictionaries that inflate file sizes. Compressing them downsamples oversized imagery, strips redundant bloat, and optimizes internal page streams for faster loading.
Privacy-First: Compress PDFs Without Uploading
Traditional online PDF compression tools require you to upload your sensitive files to remote third-party cloud servers for processing. This presents significant security, compliance, and privacy risks, particularly when handling confidential client contracts, bank statements, medical records, or tax filings.
ToolNudge operates on a strict 100% client-side privacy model. All document rendering, stream deflation, and re-encoding occur directly inside your browser sandbox. Your files never touch external servers or leave your hardware, delivering bank-grade privacy and instantaneous processing speeds.
How to Compress PDF Files Online
Reducing the size of your PDF document with ToolNudge takes just a few seconds:
- Upload your PDF file: Drag and drop your PDF document into the workspace or click "Choose PDF File" to browse your local device.
- Select Compression Preset: Choose from Low Compression (highest quality), Medium Compression (recommended balance), or High Compression (maximum size reduction).
- Inspect with Live Preview: Use the real-time Live Preview panel on the right to examine page quality, zoom in on text, and check before-and-after results.
- Compress & Download: Click the "Compress PDF Now" button to instantly build and download your optimized document.
Understanding Compression Levels & Quality
Different documents require different balance points between visual precision and file size. Our calibrated presets give you complete control over the optimization:
| Preset Level | Target DPI | Typical Size Reduction | Best Suited For |
|---|---|---|---|
| Low Compression | ~120–150 DPI | 20% to 40% | Portfolios, design schematics, high-detail presentations. |
| Medium (Recommended) | ~90–110 DPI | 40% to 65% | Standard business reports, resumes, invoices, general sharing. |
| High Compression | ~70–85 DPI | 60% to 85% | Email attachments, government portal uploads, archived scans. |
Benefits of Browser-Based PDF Compression
By utilizing modern browser WebAssembly and JavaScript engines, ToolNudge provides distinct advantages over cloud-based compressors:
Zero Upload Wait Time
No waiting for large PDF uploads over slow internet connections.
100% Data Confidentiality
Perfect for enterprise compliance, legal agreements, and personal data.
Interactive Live Preview
Inspect every optimized page before generating the final export.
Frequently Asked Questions
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