Compress PDF Online Free

Reduce PDF file size by re-rendering pages at your chosen image quality. Adjust quality and render scale, preview pages, then download the compressed PDF — all in your browser. No file uploads, no sign-up.

100% Free

No Sign-up

No Watermark

Up to 8 Files

Download as ZIP

Browser-Based · Private

Message

Drop your PDF files here

or choose a source below

Supports PDF · Up to 5 files

Files

0 / 10

Total Original—

Compressed—

Total Saved—

Slots Used—

Selected File

Width—

Height—

Type—

Original—

Compressed—

Reduction—

No file selected

Click a file in the panel to preview

Original —

Compressed —

Saved —

Compression Quality

Quality Level 75%

Smaller fileBetter quality

Max Output Size (per file)

Limit No Limit

No limit10 MB

Custom: KB

Type any KB value — quality auto-adjusts

Quick Target

Output Format

Render Scale

Scale 1.5×

Smaller fileHigher quality

Higher scale = larger output file

How to Compress a PDF File

Upload Your PDF Files

Drop up to 5 PDF files at once, or use "Choose Files" to select from your device. The tool renders a preview of the first page so you can see your document immediately. Password-protected PDFs are not supported.

Set Quality & Render Scale

Use the quality slider to control image compression on each PDF page — lower quality means a smaller file. Use the Render Scale slider to set output resolution: 1.5× gives sharp text and images, lower values reduce file size further.

Download Your Compressed PDFs

Download all compressed PDFs as a ZIP or save individually. Each file shows original size, compressed size and how much was saved.

What You Get

Batch PDF Compression

Up to 5 PDF files compressed at the same time

Quality Control

Slide to balance file size vs image sharpness per page

Render Scale

Control output resolution — lower scale = smaller file

100% Private

Your PDF files never leave your device

ZIP Download

Download all compressed PDFs in one ZIP

Mobile Friendly

Works on iPhone, Android, iPad and all browsers

Why Compress Your PDF Files?

PDF files from presentations, reports and scanned documents can run into tens of megabytes, making them impossible to email and slow to load. Compressing before sharing is essential for professional workflows and avoids attachment size rejections.

This tool works by rendering each page of your PDF to a canvas at your chosen scale and quality level, then rebuilding a new PDF. The quality slider controls how much compression is applied to the images on each page — lower quality means smaller file, higher quality means sharper text and images.

The render scale slider controls the resolution of the output. A scale of 1.5× gives a good balance of quality and file size for most documents. Reducing to 0.75× can cut the output size dramatically for documents where print-quality sharpness is not needed.

Because everything runs in your browser using PDF.js and jsPDF, your PDF files never leave your device. There is no upload, no sign-up and no file size limit imposed by a server.

Frequently Asked Questions

Common questions about compressing PDF files

How does browser-based PDF compression work?

The tool uses PDF.js to render each page of your PDF to a canvas at your chosen quality, then rebuilds a new PDF using jsPDF. The result is a smaller PDF where image content is compressed at your chosen quality level.

Will the text in my PDF still be sharp?

Text quality depends on the render scale setting. At 1.5× or higher, text is very sharp. At lower scales (0.75×) text may appear slightly softened — useful when the smallest possible file size matters more than print quality.

Is this PDF compressor really free?

Yes, completely free. No sign-up, no watermark added, no limits.

Does my PDF get uploaded to a server?

No. PDF rendering and recompression both run entirely in your browser. Your files never leave your device.

Can it compress password-protected PDFs?

No. Password-protected PDFs cannot be read by the browser and will show an error. Remove the password first using another tool, then compress here.

Can I compress multiple PDFs at once?

Yes, you can upload up to 5 PDF files at once and download all compressed versions in a ZIP.

Can I use this on my phone?

Yes. The tool is mobile-friendly and works on iPhone, Android and iPad, though large PDFs may take a moment to process on slower devices.