Will my confidential documents be uploaded to a server?

No. The compression engine executes locally in your browser through WebAssembly. Your PDFs never leave your computer or phone, making it secure for contracts, bank statements, and tax forms.

Can I set a specific target file size like 1MB or 300KB?

Yes. You can enter an exact target threshold in KB or MB, and the tool will calculate the optimal image downsampling and font subsampling to match that target.

Will text become blurry after compression?

No. Vector text fonts and shapes remain clean and scalable. The tool primarily reduces heavy raster image assets and cleans redundant metadata streams within the PDF.

Can I compress multiple PDF documents at once?

Yes. You can drag and drop multiple PDF files into the batch queue, process them simultaneously, and download all compressed files in a single ZIP.

PDF Compressor

Compress PDF files online for free directly in your browser. Reduce document size by up to 80% with custom target sizes and zero server uploads.

Select your file here to get started

or drop your file here.

.pdf

Max 2000MB. 100% Private. Files never leave your device.

What to expect

Experience fast, secure, and completely private processing directly inside your web browser.

Guaranteed Document Privacy

Bank records, resumes, and medical files stay safely on your local device.

Predictable Target Sizes

Hit strict email and application portal upload limits without trial and error.

Sharp Text Retention

Vector text, signatures, and document layouts stay crisp and fully legible.

How it works

Simply upload your content, adjust your settings, and download the result instantly.

Choose PDF Files

Drag and drop one or multiple PDF documents into the browser compression window.

Select Size Target

Pick a compression preset or specify your exact target file size in KB or MB.

Download Smaller PDF

Save the reduced document directly to your device or download all as a ZIP archive.

Frequently Asked Questions

Get quick answers about supported formats, data privacy, and using this tool.

PDF Compressor - Compress PDF files online for free directly in your browser. Reduce document size by up to 80% with custom target sizes and zero server uploads.

About This Tool

Shrink large PDF documents to manageable file sizes without compromising font sharpness or diagram readability. Whether you need to meet strict email attachment caps, upload resumes to job portals, or submit legal forms under a 2MB limit, this client-side PDF compressor reduces file weight by up to 80%. Most online PDF tools send your sensitive tax forms, financial records, and contracts to remote cloud processing queues, introducing data leaks and privacy risks. Our optimizer runs locally in your browser using WebAssembly. Your documents are rendered, downsampled, and re-encoded on your device, meaning your confidential information never travels over the web. Set specific target sizes in kilobytes or megabytes, or select smart compression presets that match standard government, university, or corporate portal requirements. Batch-process multiple PDF files simultaneously and download the optimized files individually or packaged in a ZIP archive.

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100% Open Source & Trustworthy

Every tool on PrivateTools is fully open source and runs entirely in your browser. No server uploads. No tracking. No hidden code. You can verify the source code yourself on GitHub at any time.

Open Source Code

Full source code available on GitHub — inspect, fork, or contribute.

Verify & Audit

Read every line of code. Nothing is hidden. Total transparency.

Browser-Local Processing

Files never leave your device. Zero server uploads. 100% private.

Community & Support

PrivateTools is built by the community, for the community. Found a bug? Have a tool idea? Want to report an issue? We'd love to hear from you. Every contribution makes these tools better for everyone.