Image Service

Resize images on the fly! With Storyblok’s out-of-the-box image service, you can give your customers a high-quality, compelling brand experience at a speed they wouldn’t expect, no matter what device or platform they’re using.

Installation / Requirements

You won’t have to install anything to use our Image Service — there are no system requirements either.

How to use it

After uploading an image to Storyblok you can use the image service to optimize, resize and crop them for your needs.


If you use the Storyblok rendering service you can also call the resize helper:

{{ blok.image | resize:'300x300' }}

# Example using lazyloaded responsive images with lazysizes.
  src="{{ blok.image | resize:'100x0' }}"
  data-src="{{ blok.image | resize:'300x0' }}"
  data-srcset="{{ blok.image | resize:'300x0' }} 300w,
  {{ blok.image | resize:'600x0' }} 600w,
  {{ blok.image | resize:'900x0' }} 900w" class="lazyload img-responsive" />

For self hosted or client-side projects, it would be easier to write a helper function like the following Javascript or PHP examples:

Example in Javascript

function resize(image, option) {
  var imageService = '//'
  var path = image.replace('//', '')
  return imageService + option + path

var example = '//'
console.log(resize(example, '500x500'))
// Will give you //

Example in PHP


function resize($image, $option) {
  $imageService = '//';
  $path = str_replace('//', '', $image);
  return $imageService . $option . $path;

$example = '//';

echo resize($example, '500x500');
// Will give you //



Go to your browser and enter the URL:

You should see the image with 500px of width and 500px of height. But if you adjust the dimensions in the URL, you’ll see the image automatically adjust to the dimensions you define.

If you just want it to be proportional to the width, enter a height of 0, like so:


The fit-in argument specifies that the image should not be auto-cropped but auto-resized (shrunk) to fit inside an imaginary box of width and height, instead. To fill out the box with a color you can use the fill filter filters:fill(CCCCCC) with a hexadecimal RGB expression (without the “#” character).

Example 1

The output with a grey fill color filters:fill(CCCCCC):

Storyblok - Fit In #1

Example 2

The output with a transparent fill color filters:fill(transparent) and transformed to a png:
Storyblok - Fit In #2

Quality optimization

You can also change the compression rate of the jpg image using the quality filter. The value can be 0-100.


Here’s an example of a jpg picture with a compression rate of 10:

Storyblok Quality Optimization

Changing the format

You can change the output format of the image, too. Possible options are “webp”, “jpeg”, “gif” or “png”.


Here’s an example of a jpg picture transformed into a gif:

Storyblok - Changing the format

Facial detection and smart cropping

When cropping an image, you can define a smart filter that crops around the focal point, which is determined by a smart algorithm. Just insert the keyword ‘smart’ after the size definition.



The output without the smart filter:

Storyblok - Smart cropping

The output with the smart filter:

Storyblok - Smart cropping