Free Online Image Optimizer

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Kraken PRO comes with: Full API Access, Web Interface PRO, WordPress and Magento Plugins and Kraken Cloud Storage.

1. Select source of images
URL Paster and Page Cruncher are available in Kraken PRO
2. Select optimization mode

Image Quality Settings:

Automatic Image Orientation:

Chroma Subsampling:

3. Resize your images (optional)
Don't Resize
Image Resizing is available in Kraken PRO

Click to upload or drag-and-drop your images here

File name
Original sizeKraked sizeSavings% SavingsStatus
SUMMARY[[total.originalSize | bytes]][[total.optimizedSize | bytes]][[total.savedBytes | bytes]][[total.savedPercent]]
[[ | strLimit: 60]]
[[file.originalSize | bytes]][[file.optimizedSize | bytes]][[file.savedBytes | bytes]][[file.savedPercent]]


Image Optimization Mode offers several optimization modes The mode you select should depend on your specific requirements - such as the type of image that you are compressing, and the target audience of your images.


Our intelligent lossy optimization typically produces savings of at least 60% of the initial file weight; with savings of 80% to 90% occurring frequently. Our default intelligent lossy algorithm has been specifically designed to always produces images of outstanding quality, and never of unacceptable quality degradation. In most cases, you will not be able to tell the optimized result from the original, even upon close inspection. We recommend this mode to most of our users, and for most use-cases.


This mode will save as much file weight as possible without altering a single pixel, hence the name "lossless" - meaning no information is lost whatsoever. Use this mode when your requirement is that the image should retain 100% of its initial visual information - such as for sensitive brand and marketing visuals.


Expert view is designed for users who are already familiar with image processing and optimization. Using this mode you can set different quality levels for lossy JPEG and PNG optimization, preserve certain entries in the EXIF metadata, and automatically orient your images. You can even set a custom chroma subsampling value for JPEG images.

Image Resizing Strategies

When you need to generate sets of images in different sizes or dimensions, our easy-to-use image resizing interface has you covered. Just specify your required dimensions and pick one of several strategies for resizing your images, prior to optimization:

Resize to exact width and height. Aspect ratio will not be maintained
This option will crop and resize your images to fit the desired width and height
Exact height will be set, width will be adjusted according to aspect ratio
Exact width will be set, height will be adjusted according to aspect ratio
This option will crop your images to the exact size you specify with no distortion
This strategy will first crop the image by its shorter dimension to make it a square, then resize it to the specified size
The best strategy (portrait or landscape) will be selected for a given image according to its aspect ratio

Upload a ZIP Archive Containing One or More Images (up to 1GB)

We will extract all files from the archive, optimize all the images found and when complete you'll be able to download the entire processed ZIP archive with folder structure perfectly maintained.

You must upgrade to a paid plan to use this feature. Our subscriptions start from just USD $5 / mo.


Optimized images are available for download for 12 hours. PRO users can access their images at any time via Kraken Cloud Storage.
Free Web Interface has a file size limit of 1MB.