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Optimize PDF online — quality & DPI control

Re-render PDF pages at your chosen DPI and JPEG quality. Smaller files for email, upload portals and cloud storage — 100% client-side.

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85%
Max cut
DPI
Control
100%
Private
$0
Free

What is Optimize PDF online — quality & DPI control?

TL;DR: Shrink44 PDF optimization re-rasterises pages at controlled DPI and quality so you can shrink documents for sharing without touching server uploads.

PDF optimization means restructuring or recompressing a PDF so it stores less data. Shrink44 takes a rasterising approach: PDF.js renders every page to a canvas, then jsPDF reassembles them at your target quality and DPI.

This is ideal when you need a shareable, lightweight version of an invoice, contract, brochure or scan for email or upload portals — even if you don't need text-editability.

How it works

Step-by-step

Compress your file in under a minute — 100% in your browser.

1

Open the PDF Compress tab

Click PDF Compress on Shrink44.

2

Drop your PDF

Drag and drop or click to browse.

3

Set DPI and quality

Lower DPI = smaller file. Quality controls JPEG re-encode.

4

Optimize

Shrink44 runs everything client-side.

5

Download

Save the optimized PDF.

Features

Why use Shrink44 for this

Designed for fast, private, no-signup file size reduction.

DPI control

72 / 96 / 150 / 200 / custom — pick the right tradeoff.

JPEG quality slider

10–100% control over per-page encoding.

Target file size

Hit an exact KB / MB.

Multi-page support

Handles documents with hundreds of pages.

100% private

PDF.js + jsPDF run in-browser.

Works offline

Install as a PWA.

FAQ

Frequently asked questions

What's the difference between compressing and optimizing a PDF?

Practically, they mean the same thing here — both reduce file size. Shrink44 does it by re-rendering pages, which gives strong size cuts at the cost of text-editability.

Will the PDF still print well?

Yes, especially at 150 DPI or higher. For print-quality output choose a higher DPI.

Explore

Related Shrink44 tools

Try one of these focused compressors and guides.

PDF

Compress PDF

Reduce PDF size up to 85% smaller.

Image

Compress Image

Shrink JPG, PNG and WebP images.

JPG

Compress JPG

Optimize JPEG photos for the web.

PNG

Compress PNG

Shrink screenshots and graphics.

WebP

Compress WebP

Re-encode WebP for smaller payloads.

Resize

Resize Image

4K and social-media presets.

Bulk

Bulk Compress

Process 1000+ files at once.

Convert

Convert Image

PNG↔JPG, JPG↔WebP and more.

Ready to compress?

Free forever. 100% private. No signup. Files never leave your device.

Compress File Now