Compress PDF

Reduce PDF file size while keeping the quality you choose. Pick Extreme, Recommended, or High quality compression — built for email, uploads, and sharing.

or drop PDFs here

Max 20 files • Max file size: 50MB • Supported: .pdf, application/pdf

Free Compress PDF Online — Reduce PDF Size Without the Fluff

Shrink PDF files for email, uploads, and storage. Choose Extreme, Recommended, or High quality compression. Images are downsampled and the PDF is rewritten for smaller size — the same approach used by major online compressors.

Use this free Compress PDF tool on Asli Tools to shrink PDFs in seconds. Choose how aggressive compression should be, then download your smaller file.

What is PDF compression?

PDF compression rewrites your document — especially embedded images — so the file takes less space while remaining a valid PDF. Stronger levels downsample images more; lighter levels keep more fidelity.

Why use this Compress PDF tool on Asli Tools?

You get competitor-style compression levels, honest options that actually run on the server, batch support, and clear before/after size feedback — without desktop software.

How to compress a PDF online

Follow these steps:

Step 1

Upload one or more PDF files (drag-and-drop or browse).

Step 2

Choose Extreme, Recommended, or High quality compression and any page/metadata options.

Step 3

Click Compress PDF and download when the smaller file is ready.

Is this Compress PDF tool free?

Yes — Asli Tools provides free access with fair daily limits. Sign in for unlimited free use.

Do I need to install software?

No. Use a modern browser online. The server uses Ghostscript for compression (same family of tooling used for PDF/A on Asli Tools).

Are my files private?

Files are uploaded only to compress them. They are processed for conversion and not kept for long-term storage. Prefer High quality for sensitive documents where fidelity matters most.

What browsers are supported?

Current versions of Chrome, Firefox, Safari, and Edge work best.

Can I use this on mobile?

Yes — upload from your phone or tablet browser and download the compressed PDF.

What you get with this Compress PDF tool

Highlights:

Three clear compression levels like major PDF sites.
Real image downsampling for scanned documents.
Page selection, metadata removal, and Fast Web View.
Before/after size reduction shown after compress.
Works online without installing desktop software.
Batch multiple PDFs in one session.
Built for modern browsers with responsive layouts.
Part of Asli Tools’ free PDF toolkit.

When Compress PDF is useful

Typical situations:

Shrinking attachments that bounce from email size limits.
Meeting upload caps on job, school, or government portals.
Making scanned PDFs easier to store and share.
Batch-compressing several reports at once.
Speeding up downloads for mobile users.
Preparing files for online forms with strict size rules.

Online Compress PDF vs desktop apps

Desktop apps can offer more knobs, but an online compressor is faster to start: no install, works on any device, and three clear levels cover almost every everyday need.

Tips for best results

Before you compress:

Start with Recommended — switch to Extreme only if you still need a smaller file.
Use High quality when text sharpness and print fidelity matter most.
Scanned image PDFs shrink the most; already-optimized text PDFs may save little.
Unlock password-protected PDFs before uploading.
Keep a backup of the original for archival quality.

Try Compress PDF on Asli Tools

Upload a PDF, pick a compression level, and download a smaller file in moments.

Bookmark this page for recurring size limits, and explore related PDF tools below for merge, split, and convert.

Frequently asked questions

Have more questions? Don't hesitate to email us:

Is Compress PDF free on Asli Tools?

Yes — free with fair daily limits; sign in for unlimited free access.

What compression levels are available?

Three levels: Extreme (smallest file, more quality loss), Recommended (balanced — default), and High quality (lighter compression, best fidelity).

Will compression affect PDF quality?

Yes for strong levels — mainly by downsampling images. Text-heavy PDFs usually look fine on Recommended. Use High quality when you need maximum fidelity.