TinyPNG vs MiniPx: Which Image Compressor Is Better?

TinyPNG has been the default answer to "how do I compress images?" for years. It works, it is well-known, and millions of people use it. But it was built in an era when server-side processing was the only option. MiniPx was built for a different era — one where your browser can handle compression without sending files anywhere.

So which one should you actually use? I tested both with real images and compared everything that matters.

The core difference: where your files go

TinyPNG is a server-side compressor. You upload an image, their servers crunch it, and you download the result. Your photo makes a round trip across the internet.

MiniPx is a client-side compressor. Your image never leaves your device. The browser's Canvas API and JavaScript handle the compression right on your machine. No upload, no download, no server.

This single architectural difference affects everything else — speed, privacy, offline support, and cost.

Feature-by-feature comparison

Real compression test results

I tested both tools with three images: a 4.2 MB DSLR photo (landscape), a 1.8 MB UI screenshot (PNG), and a 900 KB product photo (white background).

The results are close. TinyPNG has a slight edge on JPEG photos thanks to its custom optimization algorithm. MiniPx actually beat TinyPNG on the screenshot. In practice, a 1-3% difference is invisible to the human eye and irrelevant for page load times.

Privacy: the real differentiator

For a blog thumbnail, sending it through TinyPNG's servers is probably fine. But think about the other things people compress: passport photos, ID documents, medical images, confidential business files. Those are all going through a third-party server you don't control.

MiniPx processes everything locally. Open your browser's Network tab while compressing — zero image data leaves your machine. You can disconnect from the internet and it still works.

Speed and convenience

TinyPNG's speed depends on your internet connection and their server load. A 4 MB image takes 3-5 seconds on a fast connection. Most of that time is upload and download, not compression.

MiniPx compresses the same image in under a second because there is no network round trip. On slow connections, the difference is dramatic. On fast ones, both feel instant.

TinyPNG also has a 5 MB file size limit on the free tier. MiniPx has no hard limit — if your browser can load it, MiniPx can compress it.

When each tool makes sense

Choose TinyPNG if: you need an API for automated workflows (CI/CD pipelines, WordPress plugin auto-compression), or you are building a system that processes thousands of images programmatically. Their API is solid and well-documented.

Choose MiniPx if: you are compressing images manually — for a blog post, email attachment, form submission, or social media upload. No signup, no limits, no file size cap, works offline, and your files never leave your device.

MiniPx also supports more input formats including HEIC (iPhone photos) and can target specific file sizes like 100 KB or 50 KB — something TinyPNG does not offer.

Both are good tools. TinyPNG has the brand recognition and the API. MiniPx has privacy, speed, and zero limits. For most people doing manual image compression, MiniPx is the better fit.

Frequently asked questions

Compress, convert, and resize images in your browser. Nothing gets uploaded.