MiniPx vs Kraken.io

An optimisation API with a limited free web front-end, against a browser tool that takes files up to 200MB.

Compared in September 2026

MiniPx

Runs in your browser — files are never uploaded (Cloud HD, a Pro-only opt-in on the AI tools, is the single exception, and it deletes the photo when the run finishes)
No account, no credits, no quota for compression, conversion or resizing — only Pro Cloud HD runs are metered
Free: 5 files per batch. Pro: unlimited
JPEG, PNG, WebP and AVIF output
Works offline once the page has loaded

Open MiniPx →

Kraken.io

Cloud optimisation service, API-first
Free web interface rejects images over 1MB
Paid plans accept up to 8MB
Free account includes 100MB testing quota
Images processed on their servers

Runs in: Your browser, on your device; Cloud HD (Pro, opt-in) on 7 AI tools runs on our server
Upload: None for the free tools. A Cloud HD photo is uploaded for that run and deleted when the run finishes, and in all cases within 24 hours
Signup: Not needed; Cloud HD needs Pro
Watermark: None added by MiniPx, except on free AI results
Limits: No quota on compression, conversion or resizing; free AI runs are limited
Output: A file saved straight from your browser

MiniPx vs Kraken.io — 1MB Web Limit vs No Upload — Free, Fast & Private

Kraken.io is an API product. The web interface exists mainly to demonstrate it, and its constraints show that: the free web tool does not accept images above 1MB, and even the paid plans cap uploads at 8MB. A free account comes with 100MB of testing quota.

A 1MB ceiling is the important number, because it excludes the files most people actually need compressed. A modern phone photo is 4–12MB. A DSLR JPEG is larger still. The free web tool therefore cannot take the input that sends most people looking for a compressor in the first place.

MiniPx takes files 200 times larger

Because compression happens on your own machine, there is no upload to bound. The compressor opens any file up to 200MB, so a 60MB TIFF or a 24-megapixel RAW-derived JPEG goes straight in; a larger file opens when MiniPx can read it in pieces, and beyond that the limit is your device’s memory. The free tier also caps a batch at 5 files; Pro lifts that.

When Kraken.io is the right tool

If you are building image optimisation into an application — user uploads processed server-side, an asset pipeline, a CMS integration — an API is the correct architecture and MiniPx is not a competitor. A browser tool cannot serve a backend.

MiniPx is the better fit when a person is looking at the files: preparing photographs for a listing, shrinking documents for a portal, converting a folder of HEIC images.

Signup and privacy

Kraken.io requires an account for anything beyond the limited web demo, and processes images on its infrastructure. MiniPx’s compressor needs no account and cannot transmit your files — there is no upload path in that tool’s code. (MiniPx does have accounts for Pro billing, and a separate Cloud HD option that uploads on our AI tools, but neither touches compression.)

Competitor details checked July 2026. Plans and limits change — verify against their own pricing page before deciding. Other comparisons: ShortPixel, also cloud-metered · Optimizilla, free with no account · remove.bg

How it works

Check your file size first: Kraken.io's free web interface refuses anything over 1MB, which excludes most phone photos. MiniPx takes files up to 200MB.
Decide whether you need an API: For server-side or in-application optimisation, an API is the right shape. MiniPx runs in a browser and cannot serve a backend.
Weigh the account requirement: Kraken.io needs an account beyond the demo. MiniPx needs none at all.
Compress locally for anything sensitive: Local processing means there is no server copy of the file to consider for that job.

Frequently asked questions

What is Kraken.io's file size limit?

The free web interface does not accept images above 1MB, and paid plans cap uploads at 8MB. Since a typical phone photo is 4-12MB, the free tool cannot take most real inputs.

Is MiniPx a Kraken.io alternative?

For hands-on compression, yes — and at 200MB a file rather than 1MB, since processing happens on your device instead of an upload endpoint. As an optimisation API for a backend, no: MiniPx's compressor runs in the browser with no server-side component for that job.

Does MiniPx have a file size limit?

Yes, 200MB a file. That is a real cap, but it is 200 times what Kraken's free web interface accepts, and above it the ceiling is your device's memory rather than an upload allowance — the same absence of a server that keeps your files private is what puts your hardware in charge. The free tier also limits batches to 5 files at a time.

Do I need an account for either?

Kraken.io requires one beyond its limited web demo. MiniPx's compressor needs no account on the free or Pro tier — MiniPx accounts exist for managing a Pro subscription, not for using the tool.

Which is better for a website build pipeline?

Kraken.io, or any API-based optimiser. That is a job for a service you can call from a script, not a browser tool.