Compress Files

Free · No Signup · No Watermarks · 100% Client-Side

Compress PDF & Images Online — Exact Target Sizes, Zero Uploads

Shrink PDFs to 100 KB or images to 50 KB right in your browser. Files process locally on your device without ever touching a remote server. Free, instant, and mobile-friendly.

Your files are processed directly in your browser and are never sent to any server

Compress to the Exact Size You Need

Jump directly to a dedicated target landing page where the compressor opens with that exact size pre-selected.

Popular PDF Target Sizes

Compress PDF to 100 KBReduce PDF file to ~100 KB or underOpenCompress PDF to 200 KBReduce PDF file to ~200 KB or underOpenCompress PDF to 300 KBReduce PDF file to ~300 KB or underOpenCompress PDF to 500 KBReduce PDF file to ~500 KB or underOpenCompress PDF to 800 KBReduce PDF file to ~800 KB or underOpenCompress PDF to 1 MBReduce PDF file to ~1 MB or underOpenCompress PDF to 2 MBReduce PDF file to ~2 MB or underOpenCompress PDF to 10 MBReduce PDF file to ~10 MB or underOpenAll PDF SizesAll presets from 100 KB to 10 MBView Hub

Popular Image Target Sizes

Compress Image to 50 KBReduce image file to ~50 KB or underOpenCompress Image to 100 KBReduce image file to ~100 KB or underOpenCompress Image to 200 KBReduce image file to ~200 KB or underOpenCompress Image to 300 KBReduce image file to ~300 KB or underOpenCompress Image to 500 KBReduce image file to ~500 KB or underOpenCompress Image to 1 MBReduce image file to ~1 MB or underOpenCompress Image to 2 MBReduce image file to ~2 MB or underOpenCompress Image to 5 MBReduce image file to ~5 MB or underOpenCompress Image to 10 MBReduce image file to ~10 MB or underOpenAll Image SizesAll presets from 50 KB to 10 MBView Hub

All Free Compression Tools

Compress PDF

Reduce documents and scanned PDFs with precise target size controls.

Compress Image

Batch compress JPG, PNG, and WebP images with instant preview.

Compress JPG

Optimize JPEG photographs with minimal visible quality loss.

Compress PNG

Shrink PNG graphics while keeping 100% alpha transparency intact.

Compress WebP

Convert and compress to modern WebP format for fast web delivery.

Why Choose Kompres.site?

Lightning Fast

Compress files instantly with zero queues and zero network upload delays.

Precise Target Sizes

Choose exact target sizes like 100 KB, 200 KB, 500 KB, or 1 MB to pass portal limits.

100% Client-Side Privacy

Your files never leave your device. All compression runs locally in your browser.

How It Works

01

Select File

Pick the PDF or images you need to compress — from desktop or mobile.

02

Choose Target Size

Pick a preset profile or enter an exact target size like 100 KB, 200 KB, or 1 MB.

03

Download Instantly

Preview original vs compressed, then download your optimized file directly.

Supported Formats

Why Client-Side Compression Matters

Traditional online file compressors force you to upload sensitive documents to remote cloud servers. Those servers can retain copies, log metadata, or expose confidential paperwork in corporate data breaches.

Kompres.site shifts the entire compression workload into your web browser. Using HTML5 Canvas, WebAssembly, and native JavaScript streams, your files are compressed using your computer or phone CPU. Start compressing immediately with Compress PDF or Compress Image, or read our step-by-step guide on how to compress PDF.

Frequently Asked Questions

Are my files uploaded to your servers?

No. All compression runs entirely in your web browser using client-side JavaScript, Canvas, and WebAssembly. Your files never leave your device or touch external servers.

Is this compression service completely free?

Yes, 100% free. There are no subscriptions, no account registrations, no daily usage limits, and no watermarks added to your files.

What are the maximum supported file sizes?

You can process PDFs up to 100 MB per file, and images (JPG, PNG, WebP) up to 25 MB per file directly in browser memory.

Can I use this on my mobile phone without installing an app?

Yes. Simply open the website on Safari, Chrome, or Firefox on your iPhone or Android phone, choose your files, compress, and download. Nothing to install.

Will text in my PDF remain sharp and searchable?

Yes. Text glyphs and vector geometries are preserved in their native format whenever possible. Only embedded raster images are re-encoded and downsampled.

Can I target an exact file size like 100 KB or 200 KB?

Yes. Our adaptive compression engine calibrates multiple encoding passes to ensure your finished file complies strictly with your required size ceiling.

Which image formats are supported?

We support JPG / JPEG, PNG (including transparency), and modern WebP. You can also convert between formats during compression.

Why is my PDF still large after compression?

PDFs containing high-resolution 600+ DPI color scans or dozens of full-page photos may need a slightly larger target size or custom dimension downsampling.

Can I compress multiple images simultaneously?

Yes. Batch compression allows you to drag and drop dozens of images at once and download them with one click.

How do you guarantee document privacy?

Our code runs inside your browser sandbox. You can even disconnect your internet after loading the page and files will still compress successfully.

Ready to Reduce Your File Size?

Choose a tool above to get started immediately. Free, instant, and completely private.

Start Compressing Now