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Free image compression with no 1 MB per-file ceiling and no monthly data quota — plus resizing and format conversion, which Kraken keeps behind PRO.
No upload — files are processed in this tab
Compress images instantly and reduce file size efficiently.
This is the real tool, not a demo. Open Image Compressor on its own page.
Kraken.io is an infrastructure product wearing a web interface. The free tier — 1 MB per image, 20 per batch, 100 MB of testing quota — exists to demo the API, not to be a daily tool, and resizing and conversion are deliberately PRO-only. If your goal is to optimise a site's images on a schedule, through S3 delivery or a WordPress plugin, that is what Kraken is for and this page will not change your mind. If your goal is to get one folder of images down in size today, a browser tool has no quota to run out of.
| Comparison point | AltFTool | Kraken.io |
|---|---|---|
| Where the work happens | File tools (PDF, image, converters) run in your browser and the file is not uploaded. Tools that need live data or a model — AI tools, language checkers, lookups — send your input to an API, and say so on their own page. | Uploaded to Kraken servers; free results downloadable for 12 hours, API output kept one hour. |
| Account required | No — every tool opens and runs without signing in. | Free account required, with a 100 MB testing quota. |
| Free tier ceiling | — | 1 MB per image, 20 files per batch; resizing and conversion are PRO-only. |
| Paid plans | None. There is no paid tier and no per-file metering. | Micro $5/mo up to Enterprise $79/mo, priced by monthly data quota. |
| Ads | Yes — ads are what keep the tools free. | No ads; the free tier is limited by quota instead. |
| Desktop / mobile apps | No. Web only — no desktop or mobile app. | Plugins for WordPress and Magento rather than a desktop app. |
| API & automation | No public API. Tools are interactive pages, not endpoints. | Yes — a full REST API with S3, Azure and Cloud Files delivery. |
Paid pricing: Micro $5/month ($50/year), Basic $9/month ($90/year), Advanced $19/month ($190/year), Premium $39/month ($390/year), Enterprise $79/month ($790/year) — yearly billing includes 2 months free
Checked on 2026-07-25 against the following sources, each opening in a new tab: kraken.io/plans, kraken.io/web-interface, kraken.io/docs, kraken.io/, kraken.io/privacy. Vendors change their plans — if something here is out of date, trust Kraken.io's own page over ours.
Plenty of people should keep paying for Kraken.io, and these are the reasons why.
Left: what you clicked on Kraken.io. Right: the tool that does the same job here.
Quote anything on this page with a credit. The date below is the date this page's data was read, not the date you are reading it — cite it alongside any figure you take from here, because these numbers move.
APA
AltFTool. (2026, July 25). A free Kraken.io alternative that runs in your browser. https://www.altftool.com/alternatives/kraken-ioMLA
"A free Kraken.io alternative that runs in your browser." AltFTool, 25 July 2026, www.altftool.com/alternatives/kraken-io.BibTeX
@misc{altftool-alternatives-kraken-io,
author = {{AltFTool}},
title = {{A free Kraken.io alternative that runs in your browser}},
year = {2026},
month = {jul},
howpublished = {\url{https://www.altftool.com/alternatives/kraken-io}},
note = {Vendor pages checked 2026-07-25. Source: Kraken.io: \url{https://kraken.io/plans}.}
}Free-tier limits and prices are transcribed from the vendor's own pages on the date shown and are never converted between currencies, so quote that date alongside any figure you take from here. Vendors change their plans: if something here is out of date, trust Kraken.io's own page over ours. The vendor links are plain links - no affiliate tracking, no referral IDs, no paid placement.