Edit PDF
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Compress Your
PDF File

EditPDF AI allows you to compress PDF files online for free to reduce file sizes for email and web sharing. Choose from four compression presets that re-render and optimize pages locally in your browser. Because page rasterization is used, text becomes image-based, so inspect visual clarity before sharing your document.

Drop your PDF here

Drag & drop or click to browse · practical capacity depends on this device

PDF up to 150 MB · In-browser processing
100% Local Processing

4 Levels

Choose from higher-detail to smaller-output settings for email and web sharing.

Private

Compression runs locally in your browser without an application document-processing request.

Universal

Output opens in Adobe Acrobat, Chrome, Preview, and any standard PDF reader.

Before you start

Verified facts

Check access, supported files, limits, and processing before choosing a document.

Free

The core task does not require an account.

Price
Free — no account needed
Account
Not required
Processing
Processed locally in your browser via a Web Worker
Formats
Input: PDF · Output: image-based PDF
File limit
Files up to 150 MB · Practical capacity depends on page count, image dimensions, browser memory, and device performance
Browser support
Modern desktop and mobile browsers with JavaScript, canvas, Web Workers, and required file APIs
Clear, practical guidance

What is a PDF compressor?

A PDF compressor reduces file size by re-rendering pages at an optimized resolution, applying JPEG compression, and rebuilding the document structure. Higher compression settings reduce visual detail more aggressively.

PDF compression is ideal when documents must meet strict email attachment caps or web upload constraints. EditPDF AI compresses files directly in your browser without sending files to external servers.

Practical examples

Common ways people use this tool in real documents and day-to-day workflows.

Office & admin professionals

Compress scanned contracts, reports, and brochures so they fit inside email attachment limits before sending.

Web & marketing teams

Reduce downloadable PDF file sizes to improve page load times and keep hosting costs low.

Students & academics

Shrink large assignment PDFs that exceed submission portals' file-size caps.

Document administrators

Create smaller sharing copies while retaining the original source document separately.

At a glance

Focused workflow

Reduce PDF file size with adjustable image quality.

Supported workflow

Accepts PDF and produces PDF. Files up to 150 MB; practical capacity depends on page count, rendered image size, browser memory, and device performance

Access and processing

Core tool with browser-based document processing.

Three simple steps

How it works

  1. 1

    Select Your PDF Document

    Choose a PDF file from your device or drag it into the compressor to start local browser processing.

  2. 2

    Choose Compression Level

    Select from Low, Medium, High, or Maximum compression presets depending on your required visual balance between image clarity and smaller file size.

  3. 3

    Compress and Download

    Click Compress to re-encode page assets locally in your browser and download the lightweight PDF immediately.

Know before you upload

Formats, limits & privacy

Confirm that your file is supported and understand how this tool handles document data.

Input formats
PDF
Output formats
PDF
File limit
Files up to 150 MB; practical capacity depends on page count, rendered image size, browser memory, and device performance
Privacy & security

Compression runs locally in your browser in the background; pages are re-rendered and re-encoded without an application document-processing request.

Optional comparison

PDF Compressor vs. doing it manually

Open this comparison if you are deciding between the browser workflow and a manual process.

Compare the workflows
Doing it manually

Guess which "export quality" setting in another app will hit your target file size.

With PDF Compressor

Pick Low, Medium, High, or Maximum and check the resulting size before you keep it.

Doing it manually

Re-save the file through desktop software that may not even be installed.

With PDF Compressor

Compress directly in the browser — nothing to install.

Doing it manually

Risk overwriting the original while compressing in another app.

With PDF Compressor

Compression creates a new file; your original PDF is never modified.

Quick answers

Frequently asked questions

How do I compress a PDF file online for free?
Upload your PDF document, choose a compression level (Low, Medium, High, or Maximum), and click Compress PDF. The file is processed locally in your browser and available for immediate download.
Do I need to create an account to compress a PDF?
No. Compressing a PDF is a core browser tool that is free to use and does not require an account, sign-in, or credit card. Files are compressed locally in your browser.
How does in-browser PDF compression reduce file size?
The compressor renders pages at your chosen resolution, applies JPEG image compression, and rebuilds the PDF document in the background in your browser without server uploads.
Will my compressed PDF text remain searchable?
Because complete pages are rasterized and re-encoded for maximum size reduction, text becomes image content. If you need searchable text, use EditPDF AI’s PDF OCR tool on the compressed file.
Which PDF compression preset should I choose?
Low preserves maximum resolution for print. Medium offers a balanced setting for email attachments. High and Maximum provide the greatest file reduction for web uploads and mobile viewing.
Will my original PDF file be altered or deleted?
No. The compressor creates a separate, new PDF file. Your original document remains untouched on your local computer or mobile device.
Learn more

Guides & real-world workflows

Step-by-step guides

How to compress a PDF with EditPDF AIWhy PDF compression makes text blurry

Common use cases

Compress a PDF to Fit Email Attachment LimitsCompress a Large Scanned PDF Without Losing LegibilityCompress a PDF Portfolio to Under 10MBCompress a PDF to Under 1MB
Used in workflows for: Small Businesses
All role workflows →
Core PDF tool

Ready to use PDF Compressor?

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