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Compress PDF online — free, private, in your browser

Shrink any PDF up to 85% smaller without losing readability. No uploads, no signup, no watermark. Drop your file and download in seconds.

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85%
Max size cut
∞
Pages
100%
Private
$0
Forever

What is the Shrink44 PDF compressor?

TL;DR: Shrink44 compresses PDF files up to 85% smaller by re-rendering pages at your chosen DPI and quality — entirely client-side, with no uploads.

The Shrink44 PDF compressor reduces PDF file size by re-rendering each page as a compressed image at your chosen DPI and JPEG quality, then reassembling the result with jsPDF. The whole pipeline runs inside your browser using PDF.js — your document never leaves your device.

Use it to fit PDFs into email attachment limits (Gmail 25 MB, Outlook 20 MB), upload portals with strict size caps, cloud storage quotas, or simply to share invoices, contracts, brochures, manuals and scans faster.

Because Shrink44 is a rasterising compressor, the output is ideal for sharing, viewing and printing — not for further editing of the underlying text.

How it works

Step-by-step

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

1

Open the PDF tool

Go to Shrink44 and click the PDF Compress tab — no signup needed.

2

Drop your PDF

Drag and drop your PDF file (or click to browse). Large files are fine — everything runs locally.

3

Choose quality & DPI

Pick a quality preset (low / medium / high) or set a custom DPI for finer control.

4

Compress

Shrink44 re-renders every page in your browser using PDF.js and reassembles a new PDF with jsPDF.

5

Download

Save the compressed PDF or share it directly via the share button.

Features

Why use Shrink44 for this

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

Up to 85% smaller

Aggressive rasterisation with quality-tuned JPEG compression for true size cuts.

Quality presets & custom DPI

Pick low/medium/high or set a specific DPI for fine control.

100% client-side

PDF.js + jsPDF run in your browser. Your file never leaves your device.

Any size, any pages

There is no server-side page limit or file size cap — only your browser memory.

Works offline

Install Shrink44 as a PWA and compress PDFs without an internet connection.

Free forever

No premium tier, no watermark, no signup. Always 100% free.

Comparison

Compress PDF online — free, private, in your browser vs other tools

How Shrink44 compares to typical online file compression services.

FeatureShrink44Typical online tools
Free, no limitsYesFree tier capped
100% in-browser (no upload)YesNo
PDF stays on your deviceYesUploaded to server
Aggressive compression (60–85%)Yes20–50% typical
Works offline (PWA)YesNo
Custom DPI controlYesLimited presets
FAQ

Frequently asked questions

How much smaller can Shrink44 make my PDF?

Typical results are 50–85% smaller depending on the source PDF, image content, and the quality preset you choose. PDFs with high-resolution scanned pages or photos compress the most.

Is my PDF uploaded anywhere?

No. Shrink44 renders and re-encodes PDFs entirely in your browser using PDF.js and jsPDF. The file never touches a server.

Will text still be readable after compression?

Yes, at medium and high quality settings text remains crisp. At low quality settings text may appear slightly softer because the page is re-rendered as an image.

Can I compress a password-protected PDF?

You need to unlock the PDF first. Shrink44 will not bypass passwords or encryption.

What's the maximum PDF size I can compress?

There is no server-side limit — only your browser memory. Most laptops can handle 200+ MB PDFs comfortably.

Will the compressed PDF be searchable?

Because pages are rasterised, the resulting PDF is image-based and not searchable. If you need searchable output, keep a copy of the original and use the compressed file for sharing only.

Explore

Related Shrink44 tools

Try one of these focused compressors and guides.

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.

 OCR

Scan to Text

Extract text from photos.

Ready to compress?

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

Compress File Now