Compress PDF Online Free — No Upload

How to Compress a PDF

Upload your PDF

Drag and drop your PDF file or click to select it from your device. Your file stays in your browser — nothing is uploaded to any server.

Adjust compression settings

Choose whether to compress embedded images and set the quality level. Lower quality means smaller file size; higher quality preserves more detail.

Download the compressed PDF

Click "Compress PDF" and download the optimized file. The tool shows you exactly how much space you saved.

Why use FyleTools to compress PDFs?

100% Private

Your files never leave your device. All compression happens in your browser using WebAssembly — no server uploads, no third-party access.

Free & Unlimited

No registration, no file limits, no watermarks. Compress as many PDFs as you need, completely free.

Smart Compression

Only compresses embedded images while keeping text crisp and selectable. Metadata is cleaned up automatically for maximum space savings.

Frequently Asked Questions

Is my PDF uploaded to a server?

No. FyleTools processes everything directly in your browser using WebAssembly technology. Your file never leaves your device, making it completely safe for sensitive documents.

How much can I reduce the file size?

It depends on the PDF content. Files with large embedded images see the biggest savings — often 50–80% reduction. Text-heavy PDFs with few images may see smaller gains.

Does compression affect text quality?

No. The compression only targets embedded images. All text remains crisp, selectable, and searchable. Fonts and vector graphics are preserved exactly.

What is the difference between Compress and Optimize?

Compress PDF focuses on reducing image quality inside the PDF. Optimize PDF is a broader tool that also removes metadata and unnecessary objects. For maximum reduction, try both.

Will the text in my PDF remain selectable?

Yes. Compression only targets images within the PDF. All text remains fully selectable, searchable, and copyable.

Can I compress scanned documents?

Yes. Scanned PDFs contain large images, so they typically see the best compression results — often 50-80% file size reduction.

Does this work on mobile?

Yes. The tool runs entirely in your browser on any device. Perfect for compressing PDFs before sending via email on your phone.

Can I compress multiple PDFs at once?

Currently the tool compresses one PDF at a time. Upload each file individually for the best compression results.

Can I compress a PDF to under 1MB?

It depends on the original content. Image-heavy PDFs can often be compressed to under 1MB by lowering the quality slider. Text-only PDFs are already small and may not reach that target. For target sizes, try compressing to 1MB or to 2MB. See our PDF compression guide for detailed tips.

Does compressing remove images from my PDF?

No. Compression re-encodes images at a lower quality to reduce file size, but all images remain visible in the document. Only their resolution and quality are adjusted.

Can I compress a PDF multiple times for even smaller size?

You can, but each round of compression yields diminishing returns. The first compression pass typically provides the most significant reduction.

Will compressed PDFs print well?

For standard office printing, compressed PDFs look great. For high-quality photo prints, use a higher quality setting to preserve image detail.

When to Use This Tool

Reduce PDF size to meet email attachment limits (under 10MB or 25MB)

Compress scanned documents that contain large images

Shrink presentation PDFs before uploading to a website or LMS

Make large reports lighter for faster sharing on messaging apps

Supported Formats

Format	Description	Best For
Image-heavy PDFs	PDFs with photos and graphics	Maximum compression (50-80% reduction)
Scanned documents	PDFs created from scanners	Significant size reduction
Text-heavy PDFs	Mostly text with few images	Moderate compression (10-30% reduction)

Tips & Best Practices

Use lower quality settings for email attachments — the visual difference is minimal on screen

Scanned documents typically yield the best compression results (50-80% savings)

If you need the smallest possible file, combine Compress with the Optimize tool. Also, compress images before embedding to keep PDF size small

Always preview the compressed PDF to ensure the quality meets your needs

How It Works — 100% Private Processing

FyleTools compresses your PDF entirely in your browser using WebAssembly and the lopdf library compiled from Rust. The compression algorithm re-encodes embedded images at a lower quality while preserving all text and vector content. Your document never leaves your device — making it safe for financial statements, medical records, and legal documents.