A free Kraken.io alternative that runs in your browser

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

Try it now: Image Compressor

Compress images instantly and reduce file size efficiently.

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This is the real tool, not a demo. Open Image Compressor on its own page.

AltFTool vs Kraken.io

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.

AltFTool compared with Kraken.io. Figures in the Kraken.io column are transcribed from their own pricing, help and privacy pages.
Comparison pointAltFToolKraken.io
Where the work happensFile 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 requiredNo — 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 plansNone. There is no paid tier and no per-file metering.Micro $5/mo up to Enterprise $79/mo, priced by monthly data quota.
AdsYes — ads are what keep the tools free.No ads; the free tier is limited by quota instead.
Desktop / mobile appsAndroid only. AltFTool publishes a few free Android apps as APK downloads on its Apps page; there is no desktop app.Plugins for WordPress and Magento rather than a desktop app.
API & automationNo public API. Tools are interactive pages, not endpoints.Yes — a full REST API with S3, Azure and Cloud Files delivery.

Kraken.io's free tier, in their own words

  • Free account comes with a 100 MB testing quota, no credit card required
  • The free Web Interface caps each image at 1 MB; the PRO interface raises this to 32 MB
  • The free Web Interface allows up to 20 files per batch
  • Image resizing and image conversion are PRO-only — the free interface optimises only
  • Optimised images are available for download for 12 hours on the free Web Interface; Kraken's API docs state optimised images stay on their servers "for one hour only". PRO users keep files in Kraken.io Cloud Storage
  • Paid plans are monthly data quotas — 500 MB (Micro) to 60 GB (Enterprise) — with overage billed at $5/GB down to $1/GB depending on plan

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.

What Kraken.io does better

Plenty of people should keep paying for Kraken.io, and these are the reasons why.

  • The compression engine is the product, and it is a strong one: lossless and intelligent lossy modes tuned per format across JPG, PNG, WebP (incl. animated), GIF, SVG, AVIF, HEIC and PDF, with a detailed savings report.
  • It is built for automation, not one-off use: a full REST API, WordPress plugin, Magento extension, and direct delivery of optimised files to S3, Azure, Cloud Files or SoftLayer. A browser-only tool cannot optimise an entire site's image pipeline on a schedule.
  • Server-side processing means very large batches and heavy formats do not depend on the user's device or browser memory, and results are consistent regardless of the machine used.
  • Kraken.io Cloud Storage keeps optimised assets retrievable for paid users, which suits agencies re-downloading assets long after the job ran.

And what AltFTool does not do

  • No API, no WordPress or Magento plugin, no S3 delivery — nothing here can run on a schedule against a site's asset pipeline.
  • Kraken's per-format tuning across animated GIF, SVG, AVIF and HEIC goes deeper than a browser re-encode does.
  • No cloud storage of results. Kraken keeps optimised assets retrievable for paid users; we hand you the file and forget it.

Visit Kraken.io (opens in a new tab)

Where each Kraken.io job goes here

Left: what you clicked on Kraken.io. Right: the tool that does the same job here.

The tools that cover Kraken.io work

Questions people actually ask

Kraken's free web interface caps images at 1 MB. Does AltFTool?
No fixed cap. The practical limit is browser memory, which comfortably handles typical photographs — well past 1 MB. Kraken's cap protects a paid data quota; we have no quota.
Can I resize and convert for free?
Yes. Both are PRO features on Kraken's web interface; here they are separate free tools that run locally.
Should I still use Kraken?
If image optimisation is part of a deployment or CMS pipeline, yes. Their REST API, plugins and S3 delivery solve a problem a page in a browser cannot solve at all.

Cite this page

APA, MLA, BibTeX

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.

Canonical URL
https://www.altftool.com/alternatives/kraken-io
Author and publisher
AltFTool — no individual author is credited on this page.
Vendor pages checked
Read from
  • Kraken.iokraken.io/plans (+4 more pages from the same source, listed in full above)

APA

AltFTool. (2026, July 25). A free Kraken.io alternative that runs in your browser. https://www.altftool.com/alternatives/kraken-io

MLA

"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.

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