Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize
by Kraken.io · Performance
Optimize images automatically — compress, resize and convert to WebP, AVIF & more with Kraken.io. Faster pages, smaller files, same quality.
Try it live opens a temporary test site in your browser, which can take about 20 seconds to load. Plugins that rely on outside services or a full server may not work completely there.
Health
A 87/100
no flags
Active installs
10K+
≈13K estimated
Momentum
+13%
downloads vs prior 30d
Biggest opportunity: Swap “image optimization”, “optimize images” and “avif” for “bulk optimize”, “convert avif” and “image resize”. “image optimization” isn't earning its slot: you're not in the first 24 results for its own search. “bulk optimize” sits at #5 untagged, close enough for a declared tag to move it up. “optimize images” isn't earning its slot: it only gets you to #24. “convert avif” sits at #11 untagged, close enough for a declared tag to move it up. “avif” isn't earning its slot: it only gets you to #20. “image resize” sits at #12 untagged, close enough for a declared tag to move it up. All five slots are taken, so one has to go.
87 health vs 69 average across 1,809 Performance plugins
Install conversion
How it's measured →2.4%
of downloads still active
At least 10K of 422.7K lifetime downloads are still running, above its category: the median Performance plugin keeps 1.4%, across 1,105 plugins.
Downloads count every update, not just first installs, so older and more frequently released plugins read lower. Compare against other Performance plugins, not across the directory. wp.org reports active installs as the bottom of a band, so the real rate is this or higher.
This plugin shipped 5 releases in the last 12 months, and every existing install that updated counted as another download. wp.org publishes no split between first installs and updates, so we show the raw rate rather than guess at one.
Details
Directory ranking optimization
How it's scored →How well this listing is tuned to rank in WordPress.org search, on the factors an owner controls. Not popularity, optimization.
Excellent listing optimization
Well tuned across the board
Updated 132 days ago
Tested up to WordPress 7.0.8, the current branch or newer
4.5★ over 119 reviews, smoothed to 4.38★
5 of 5 tags set · short description in place
Search visibility
How it's tracked →Directory searches this plugin turns up in, and which way each one is moving. WordPress.org publishes no history of search positions, so this starts the day we first tracked a keyword and never backfills.
38
Momentum
Losing ground
-0.2
Velocity
places per keyword, 28d
19%
Breadth
of keywords climbing, 28d
-0.2
Acceleration
recent half vs earlier
wp.org is where the directory puts the plugin for that search. On merit is where it would sit if results were ranked on rating, support and updates, without the install boost. The last column is how far the wp.org position moved, from our first reading in the last 90 days to the latest.
| Keyword | wp.org | On merit | wp.org move, 90 days |
|---|---|---|---|
| bulk optimize | #5 | #7 | 0 |
| image optimizer | #10 | #8 | down 1 |
| resize | #11 | #9 | down 1 |
| convert webp your tag | #14 | #11 | up 1 |
| product image resize | #5 | #6 | 0 |
| convert | #15 | #10 | down 1 |
| compress | #15 | #13 | up 1 |
| convert to webp | #16 | #13 | up 1 |
| convert avif | #11 | #9 | down 2 |
| optimizer | #19 | #11 | down 2 |
| same | #17 | #13 | down 2 |
| avif your tag | #20 | #15 | down 3 |
| bulk image optimizer | #7 | #6 | 0 |
| compress images your tag | #20 | #16 | down 1 |
| image resize | #12 | #10 | 0 |
| bulk resize | #7 | #8 | 0 |
| optimize images your tag | #24 | #20 | down 1 |
| image compress | #14 | #14 | up 1 |
| jpeg | #17 | #12 | up 1 |
| optimize image | #19 | #18 | up 1 |
| image optimization your tag | Not in the top 24 | ||
167 searches this plugin appeared in over the last 90 days, 20 listed. 126 left out as unrelated or noise (years, numbers, stray words). 1 of its tags isn't in the top 24 for their own search.
What to do about it
- Swap “image optimization”, “optimize images” and “avif” for “bulk optimize”, “convert avif” and “image resize”. “image optimization” isn't earning its slot: you're not in the first 24 results for its own search. “bulk optimize” sits at #5 untagged, close enough for a declared tag to move it up. “optimize images” isn't earning its slot: it only gets you to #24. “convert avif” sits at #11 untagged, close enough for a declared tag to move it up. “avif” isn't earning its slot: it only gets you to #20. “image resize” sits at #12 untagged, close enough for a declared tag to move it up. All five slots are taken, so one has to go.
- One page off on “convert webp”. #14 puts you just past the first ten results, where almost all the clicks stop. The gap to close is small.
Daily downloads
Since 5 Oct 2022 · 1,489 days · wp.org + Plugin Pulse archive
30-day downloads
Rolling 30-day volume · peak 13.3K · peaks are release surges
Directory rank vs rivals
wp.org popularity rank over time · higher is better · when a rival's line climbs above yours, they've overtaken you
Rating trend
Star average over time · dips mark rough releases
Health trend
Composite health score, snapshotted daily
Update activity
How busy the existing users are, measured as downloads in the last 30 days for every 1,000 active sites. A spike means a new release everyone's pulling; a long, slow decline means an aging user base that updates less.
Release cadence
Actively maintainedHow often this plugin actually ships. A steady rhythm is the maintenance signal a single "last updated" date can't show.
5
releases in the last 12 months
4mo ago
latest release · v3.0.3 · 22 Jun 2026
41
tagged releases on record
Recent releases
What its installed base runs
via wordpress.orgShare of active installs on each version of this plugin · 31% run the current release. Green is the current release; a big slice on older versions is a user base that has stopped updating.
Estimated active installs
The public count shows “10K+”. Our estimate pins where the real number sits.
Crossed into this band 3 months ago; a band this size takes about a year or more to cross, which places it about 28% of the way through.
At the current install trend, crossing 20K+ in roughly 1252 days.
Install history since 6 May 2021
Reviewer account pattern
from wp.org reviewer profiles8 of the last 21 four- and five-star reviews came from accounts created within a month of posting the review, and 7 of those landed between 2016-04-12 and 2016-05-09.
Registering a wp.org account just to leave a review is common and often entirely legitimate. The share here is unusually high for the sample, so it's worth keeping in mind while reading the reviews.
Recent reviews
All reviews on wp.org ↗- ★★★★★ blieben4.8y ago
Not worth the time.
Read on wp.org ↗ - ★★★★★ David Artiss4.8y ago
As others are noting here, their customer service is terrible. In fact I’d use the word “non-existent”. After signing up with an account I decided that the service was no longer what I needed and contacted them to delete my account. Multiple times, in different ways, I’ve contacted their customer support about this and never had a response. Currently breaching GDPR rules, they’re going to be reported. Thank goodness I never handed over any payments to them.
Read on wp.org ↗ - ★★★★★ yoavshai5.1y ago
Whatever you do, do not use this service. They will happily charge your credit cars, but when you try to reach them for support, they never respond. Their service is a disgrace.
Read on wp.org ↗ - ★★★★★ msstm6.0y ago
I put 2 stars because it was fine for a while but now there is no update for over a year. There is no response from support. It doesn’t matter to the developer, he seems to keep taking the money and not care if stuff works or not. Very annoying. I am planning to migrate elsewhere, I don’t think that the developer is working on anything for many many many months. This topic was modified 2 years, 7 months ago by msstm.
Read on wp.org ↗ - ★★★★★ Trac Nguyen8.2y ago
– It works with 1 image but not at Google PageSpeed standard – It doesn’t work with bulk action – The worst thing is I inputted my credit card there and they refused to let me cancel my subscription, what a very bad thing from kraken.io
Read on wp.org ↗ - ★★★★★ emldesign9.5y ago
Just saved a few GB from my websites and the support service is great. Thanks Karim !
Read on wp.org ↗ - ★★★★★ jalatestuser9.7y ago
The plugin constantly has issues to the point where we have had to disable it. We have attempted to contact Kraken for support (as we are a paying customer) and they simply do not respond!
Read on wp.org ↗ - ★★★★★ recons9.7y ago
Did not work at all. Got api keys, made settings, saved and nothing absolutely happened, although I selected to do the bulk. There is no “run” button with this. Uninstalling. waste of time. This topic was modified 9 years, 5 months ago by recons.
Read on wp.org ↗
Latest updates
via wp.org changelogRecent releases and news for this plugin
- — Version 3.0.3 New: the plugin is now translated into 64 locales, covering 39 languages — Albanian (Shqip), Arabic (العربية), Belarusian (Беларуская), Bosnian (Bosanski), Bulgarian (Български), Chinese (中文 — Simplified, Traditional and 3.0.3
- — Version 3.0.2 Security: tightened permission checks so users can only optimize, convert or reset media they are allowed to edit. Fixed: files without thumbnails (PDFs, AVIF, small images) are now handled correctly — they optimize and 3.0.2
- — Version 3.0.1 Performance and reliability improvements to the Kraken.io API connection, with broader server compatibility. 3.0.1
- — Version 3.0.0 New: optimization support for WebP, AVIF, HEIC, HEIF and PDF (in addition to JPEG, PNG and GIF). New: convert uploads to WebP, AVIF, JPEG, PNG or GIF on the fly, synced live between the Media panel and settings. New: a K 3.0.0
- — Version 2.7.0 Complete plugin rewrite with a modular OOP architecture. Added WebP image generation and display support. Added background processing for image optimization. Added support for WP Retina 2x, NextGen Gallery and WP Offload 2.7.0
- — Version 2.6.6 Security release to solve https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-38454 2.6.6
Security history
via Wordfence IntelligenceAll 3 disclosed vulnerabilities are patched in the current version (3.0.3). Sites still on an older version should update.
Vulnerability records provided by Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. License and terms.
CVE records: Copyright 1999-2026 The MITRE Corporation. CVE terms of use.
Behavioral tests
via WP HiveAutomated install-time checks, tested on PHP 8.1.12 · WP 7.0
AI assistants
How it's measured →Whether ChatGPT and Claude name this plugin when asked the category question, and whether the readme gives them something to quote.
Not measured yet for this plugin’s topics. Its tracked searches are not among the measured topics. See the topics measured so far.
Readme readiness
8 of 8 pass · checked 28 Oct 2026Can an assistant quote this readme? Eight deterministic checks over the wp.org listing, no model involved.
- ✓ Says what it does "Optimize images automatically — compress, resize and convert to WebP, AVIF & more with Kraken.io. Faster pa..."
- ✓ Has a FAQ 16 questions in the FAQ.
- ✓ FAQ asks real questions 16 of 16 read like questions a user would type.
- ✓ Names who it is for Names its audience or use cases ("built for", "use it").
- ✓ Names what it works with Mentions WooCommerce, Multisite, Facebook, Twitter and 1 more.
- ✓ Headings and lists 7 headings and 4 lists.
- ✓ Enough to quote 6,143 characters of description.
- ✓ Tags match the text 3 of 5 tags appear in the text; "compress images", "convert webp" do not.
Growth timeline
Install-tier crossings we have observed, and how long each tier took to outgrow
- 2026-07-20 9K+ → 10K+ up after 89 days in tier
- 2026-04-22 10K+ → 9K+ down after 509 days in tier
- 2024-11-29 20K+ → 10K+ down after 567 days in tier
- 2023-05-12 30K+ → 20K+ down after 756 days in tier
- 2021-04-16 40K+ → 30K+ down after 36 days in tier
- 2021-03-11 30K+ → 40K+ up after 132 days in tier
- 2020-10-30 40K+ → 30K+ down after 442 days in tier
- 2019-08-15 30K+ → 40K+ up after 532 days in tier
Competes with
The plugins that solve the same job, ranked by shared tags then reach, closest match first. The letter on the right is each plugin's health grade (A best, F worst).
-
Smush – Image Optimization, Compression, Lazy Load, WebP & CDN 1M+ installs · 4.8★ · 4 shared tags A -
Imagify Image Optimization: Optimize Images | Compress & Convert to WebP/AVIF 900K+ installs · 4.3★ · 4 shared tags A -
Converter for Media – Optimize images | Convert WebP & AVIF 500K+ installs · 4.9★ · 4 shared tags A -
ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 300K+ installs · 4.5★ · 4 shared tags A -
Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization 200K+ installs · 4.7★ · 4 shared tags A -
Robin Image Optimizer – Unlimited Image Optimization, WebP & AVIF 100K+ installs · 4.4★ · 4 shared tags A
Embed this report card
Drop a live Pulse card for Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize into a readme, a review or a deck. It updates itself.
<iframe src="https://plugins.wpmayor.com/embed/kraken-image-optimizer" width="480" height="300" style="border:0" loading="lazy" title="Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize — Plugin Pulse"></iframe> Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize: 10K+ active installs, 4.5★ (119 reviews). Plugin Pulse (WP Mayor), as of 2026-11-01. https://plugins.wpmayor.com/plugin/kraken-image-optimizer
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