MiniPx vs TinyPNG

Two of the most popular free image compressors, head to head. One uploads your files to a server. The other never lets them leave your browser. Here is how they actually compare.

Quick verdict

If privacy is what you care about, MiniPx is the clear winner: your files are never uploaded anywhere. TinyPNG has a great API and solid compression quality, but every image you compress travels to their servers, and the free web tool caps you at 20 images per batch with a 5MB limit per file. Be honest about the trade: MiniPx’s free tier processes 5 files per batch, so for one-off and small jobs we are simpler, and for large batches you are choosing between TinyPNG’s upload and MiniPx Pro.

Feature comparison

The privacy difference is huge

This is the single biggest difference between these two tools. When you compress an image with TinyPNG, your file gets uploaded to their servers in the Netherlands. Their system processes it, and you download the result. That round trip takes time, and it means your images pass through third-party infrastructure.

MiniPx does everything in your browser. Your images never leave your device. If you are compressing client work, personal photos, or anything you would rather keep private, that matters a lot. I think this alone is reason enough to pick MiniPx for most use cases.

Format support

TinyPNG started with PNG (the name gives it away) and has kept pace since. Their current format list is JPEG XL, AVIF, WebP, JPG, PNG, and APNG, and they accept HEIC uploads by automatically converting them to JPG. If you have read an older comparison saying TinyPNG is PNG-and-JPEG-only, that is out of date.

Where MiniPx still goes wider is SVG and PDF, and in what it does with HEIC: you choose the output format rather than being handed a JPG. For the mainstream web formats the two tools now overlap almost completely, so format support is a weaker reason to choose between them than it used to be. Privacy is the real dividing line.

Free tier limits

TinyPNG’s free web optimizer takes up to 20 images at a time, each up to 5MB, plus 3 free format conversions. There is no daily quota to wait out: you can run another batch of 20 straight away. The real ceilings are the 5MB per file and the queue size, and going past either means a Web Pro or Web Ultra subscription.

MiniPx draws its line in a different place. There are no accounts, no daily quotas, and no monthly credits, and individual files can be far larger: the hard cap is 200MB, and in practice the real ceiling is how much memory your browser tab can give a decoded image. What the free tier does cap is queue size, at 5 files per batch, and Pro removes that. So TinyPNG lets you queue more files at once for free; MiniPx lets you work with much bigger ones, and never uploads them.

Where TinyPNG wins

I want to be fair here. TinyPNG has a solid API that developers can plug into build pipelines, CMS integrations, and automated workflows. If you need programmatic compression at scale (and you are willing to pay for it), TinyPNG's API is well-documented and reliable.

TinyPNG also has WordPress and Shopify plugins that auto-compress images on upload. If your entire workflow lives inside those platforms, that convenience is hard to beat.

No account, no daily quota, no uploads. 7+ formats. Free tier runs 5 files per batch.