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Kraken.io Image Optimizer · Version history

Kraken.io Image Optimizer changelog and version history

Latest version
3.0.3
Jun 22, 2026 (4 months ago)
Releases
41
since 2014
In the last year
5
about one every 27 days
Tested up to
WordPress 7.0.8
PHP 5.6 or later

Releases each year

  • 201412 releases
  • 201513 releases
  • 20164 releases
  • 20182 releases
  • 20191 release
  • 20211 release
  • 20221 release
  • 20232 releases
  • 20265 releases

20265 releases

  1. Kraken.io Image Optimizer 3.0.3Latest

    • 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 Hong Kong), Croatian (Hrvatski), Czech (Čeština), Danish (Dansk), Dutch (Neder…
    • New: a “Savings on this site” panel on the Stats screen — a clear breakdown of how much your full-size images and their thumbnails were each reduced (from how much, to how much), calculated from your own data and kept separate from the shared account quota.
    • New: a sticky “Save Changes” bar on the settings screen with a live “unsaved changes” reminder, so edits — especially a freshly pasted API key and secret — are never lost by forgetting to save.

  2. Kraken.io Image Optimizer 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 show their savings, and no longer report a false error or keep reappearing in the Bulk Optimize list.
    • Fixed: optimization failures now report the real reason (e.g. a timeout or a missing file) instead of a generic “Unknown error.”
    • Fixed: free accounts that reach their test quota now see an upgrade prompt instead of an inaccurate paid-plan billing notice.

  3. Kraken.io Image Optimizer 3.0.1

    • Performance and reliability improvements to the Kraken.io API connection, with broader server compatibility.

  4. Kraken.io Image Optimizer 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 Kraken.io control panel on the Media Library, Add Media and Plugins screens, plus a Dashboard widget — showing connection status, plan, quota usage, active settings and supported formats.
    • New: a dedicated Bulk Optimize with Kraken.io screen, reachable from the Media menu, the Media Library and the panel.
    • New: per-image savings and error badges in the Media grid and list, updated live as images optimize.
    • New: conflicting-optimizer detection with one-click deactivation of other image plugins.
    • New: “Who can optimize images” capability setting (all logged-in users by default).
    • New: a Support tab linking to the WordPress.org forum and a pre-filled email, with copyable diagnostics.
    • Security: API key and secret are now write-only and masked — never pre-filled or exposed in the page source; nonce and capability checks on all AJAX actions; uploads are content-verified; raw SVG upload disabled as an XSS precaution.
    • Change: the large 1536×1536 and 2048×2048 retina sizes are now off by default to save quota (filterable; existing choices are respected).
    • Change: legacy WebP companion options are deprecated in favour of Convert.
    • Fix: a now-resolved error no longer keeps showing an error badge after a successful re-optimization.
    • Fix: the bulk count now lists only supported image formats (no more HTML/other files).
    • Fix: division-by-zero when calculating savings on PHP 8; assets are cache-busted by file modification time.

  5. Kraken.io Image Optimizer 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 Media.
    • Security: capability and nonce checks on the reset-all AJAX handler; input sanitization; whitelist validation for the settings tab parameter.
    • Requires PHP 5.6+ and WordPress 4.9+.

20232 releases

  1. Kraken.io Image Optimizer 2.6.8

  2. Kraken.io Image Optimizer 2.6.7

20221 release

  1. Kraken.io Image Optimizer 2.6.6

    • Security release to solve https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-38454

20211 release

  1. Kraken.io Image Optimizer 2.6.5

20191 release

  1. Kraken.io Image Optimizer 2.6.4

20182 releases

  1. Kraken.io Image Optimizer 2.6.3

  2. Kraken.io Image Optimizer 2.6.2

20164 releases

  1. Kraken.io Image Optimizer 2.6.1

  2. Kraken.io Image Optimizer 2.6.0

    • Added the ability to choose which image sizes get optimized.
    • Added the ability to change the chroma subsampling scheme for JPEG images.
    • Stability and compatibility improvements.

  3. Kraken.io Image Optimizer 2.5.1

  4. Kraken.io Image Optimizer 2.5.0

    • Optionally disable optimization of the main image for faster uploads.
    • Restrict the maximum dimensions of uploads (resizing), with sharpening enhancement.
    • Force a discrete JPEG quality value; preserve selected EXIF tags; auto-orient by EXIF.

201513 releases

  1. Kraken.io Image Optimizer 2.0.0

    • Kraken.io settings moved to their own section (Settings → Kraken.io) with grouped Advanced Settings.

  2. Kraken.io Image Optimizer 1.0.9.1

  3. Kraken.io Image Optimizer 1.0.9

  4. Kraken.io Image Optimizer 1.0.8

  5. Kraken.io Image Optimizer 1.0.7

  6. Kraken.io Image Optimizer 1.0.6

  7. Kraken.io Image Optimizer 1.0.5.9

  8. Kraken.io Image Optimizer 1.0.5.8

  9. Kraken.io Image Optimizer 1.0.5.7

  10. Kraken.io Image Optimizer 1.0.5.6

  11. Kraken.io Image Optimizer 1.0.5.5

  12. Kraken.io Image Optimizer 1.0.5.4

  13. Kraken.io Image Optimizer 1.0.5.3

201412 releases

  1. Kraken.io Image Optimizer 1.0.5.2

  2. Kraken.io Image Optimizer 1.0.5.1

  3. Kraken.io Image Optimizer 1.0.5

  4. Kraken.io Image Optimizer 1.0.4

  5. Kraken.io Image Optimizer 1.0.3.4

  6. Kraken.io Image Optimizer 1.0.3.3

  7. Kraken.io Image Optimizer 1.0.3.2

  8. Kraken.io Image Optimizer 1.0.3.1

  9. Kraken.io Image Optimizer 1.0.3

    • Added the “Krak ’em all” bulk optimization feature to the Media Library Bulk Actions menu.

  10. Kraken.io Image Optimizer 1.0.2.1

  11. Kraken.io Image Optimizer 1.0.2

  12. Kraken.io Image Optimizer 1.0.1

Questions about Kraken.io Image Optimizer’s releases

What is the latest version of Kraken.io Image Optimizer?

3.0.3, released on Jun 22, 2026 (4 months ago). It’s tested up to WordPress 7.0.8 and needs PHP 5.6 or later.

How often is Kraken.io Image Optimizer updated?

5 releases in the last year, about one every 27 days. Its first release on WordPress.org dates from February 2014.

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Release dates come from the day each version’s folder was made in Kraken.io Image Optimizer’s WordPress.org SVN repository; the notes from its readme’s changelog, as its authors wrote it.