Compress PNG & JPG Offline: The Private TinyPNG Alternative

Every web developer, designer, and content creator knows the struggle of dealing with massive image files. A 5MB photo might look beautiful, but it will absolutely destroy a website's load time and ruin your SEO score.

For years, the standard solution has been to drag those images into a cloud-based service like TinyPNG or Optimizilla. But what if you are compressing proprietary app screenshots, unreleased product photos, or documents containing sensitive information?

Uploading your images to a random server is a massive security risk.

Why Cloud Compressors Are a Risk

When you use a traditional online image compressor, you are engaging in a risky transaction:

Upload Time: You have to wait to push megabytes of data over your internet connection.
Server Processing: A third-party server runs the compression algorithm. You have no guarantee that they delete your original file.
Download Time: You have to wait to pull the new file back down.
Paywalls: Because server compute costs money, these tools almost always cap you at 20 images or a 5MB limit before begging for a credit card.

DuckConvert: Client-Side Compression

We have built a free, offline Image Compressor that runs directly inside your web browser.

Using modern Web Worker technology, our tool downloads the compression algorithm to your machine. Your images never leave your device.

The Local Advantage:

Instant Processing: Without the upload/download cycle, compression starts instantly and runs at the speed of your computer's CPU.
No Size Limits: Because we don't pay for server bandwidth, we don't care if you compress a 50MB file.
100% Private: It is mathematically impossible for us to view or store your images. You can even load the page and disconnect from the internet before compressing!

How to Compress Images Locally

Go to the DuckConvert Image Compressor.
Drag and drop your .png, .jpg, or .webp file.
Adjust the slider to set your target maximum file size (e.g., 1MB) or max resolution.
Click Start Compression.
Instantly see how much space you saved and download the optimized file.

Stop giving your unreleased assets to the cloud. Start compressing your images locally today.