Symfony
sponsored by SensioLabs
Menu
  • About
  • Documentation
  • Screencasts
  • Cloud
  • Certification
  • Community
  • Businesses
  • News
  • Download
  1. Home
  2. Documentation
  3. Frontend
  4. Assetic
  5. How to Use Assetic for Image Optimization with Twig Functions
  • Documentation
  • Book
  • Reference
  • Bundles
  • Cloud
Search by Algolia

Table of Contents

  • Using Jpegoptim
    • Removing all EXIF Data
    • Lowering Maximum Quality
  • Shorter Syntax: Twig Function

How to Use Assetic for Image Optimization with Twig Functions

Edit this page

Warning: You are browsing the documentation for Symfony 2.8, which is no longer maintained.

Read the updated version of this page for Symfony 6.2 (the current stable version).

How to Use Assetic for Image Optimization with Twig Functions

Caution

Starting from Symfony 2.8, Assetic is no longer included by default in the Symfony Standard Edition. Refer to this article to learn how to install and enable Assetic in your Symfony application.

Among its many filters, Assetic has four filters which can be used for on-the-fly image optimization. This allows you to get the benefits of smaller file sizes without having to use an image editor to process each image. The results are cached and can be dumped for production so there is no performance hit for your end users.

Using Jpegoptim

Jpegoptim is a utility for optimizing JPEG files. To use it with Assetic, make sure to have it already installed on your system and then, configure its location using the bin option of the jpegoptim filter:

  • YAML
  • XML
  • PHP
1
2
3
4
5
# app/config/config.yml
assetic:
    filters:
        jpegoptim:
            bin: path/to/jpegoptim
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:assetic="http://symfony.com/schema/dic/assetic"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/assetic
        http://symfony.com/schema/dic/assetic/assetic-1.0.xsd">

    <assetic:config>
        <assetic:filter
            name="jpegoptim"
            bin="path/to/jpegoptim" />
    </assetic:config>
</container>
1
2
3
4
5
6
7
8
// app/config/config.php
$container->loadFromExtension('assetic', array(
    'filters' => array(
        'jpegoptim' => array(
            'bin' => 'path/to/jpegoptim',
        ),
    ),
));

It can now be used from a template:

1
2
3
4
{% image '@AppBundle/Resources/public/images/example.jpg'
    filter='jpegoptim' output='/images/example.jpg' %}
    <img src="{{ asset_url }}" alt="Example"/>
{% endimage %}

Removing all EXIF Data

By default, the jpegoptim filter removes some meta information stored in the image. To remove all EXIF data and comments, set the strip_all option to true:

  • YAML
  • XML
  • PHP
1
2
3
4
5
6
# app/config/config.yml
assetic:
    filters:
        jpegoptim:
            bin: path/to/jpegoptim
            strip_all: true
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:assetic="http://symfony.com/schema/dic/assetic"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/assetic
        http://symfony.com/schema/dic/assetic/assetic-1.0.xsd">

    <assetic:config>
        <assetic:filter
            name="jpegoptim"
            bin="path/to/jpegoptim"
            strip-all="true" />
    </assetic:config>
</container>
1
2
3
4
5
6
7
8
9
// app/config/config.php
$container->loadFromExtension('assetic', array(
    'filters' => array(
        'jpegoptim' => array(
            'bin'       => 'path/to/jpegoptim',
            'strip_all' => 'true',
        ),
    ),
));

Lowering Maximum Quality

By default, the jpegoptim filter doesn't alter the quality level of the JPEG image. Use the max option to configure the maximum quality setting (in a scale of 0 to 100). The reduction in the image file size will of course be at the expense of its quality:

  • YAML
  • XML
  • PHP
1
2
3
4
5
6
# app/config/config.yml
assetic:
    filters:
        jpegoptim:
            bin: path/to/jpegoptim
            max: 70
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:assetic="http://symfony.com/schema/dic/assetic"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/assetic
        http://symfony.com/schema/dic/assetic/assetic-1.0.xsd">

    <assetic:config>
        <assetic:filter
            name="jpegoptim"
            bin="path/to/jpegoptim"
            max="70" />
    </assetic:config>
</container>
1
2
3
4
5
6
7
8
9
// app/config/config.php
$container->loadFromExtension('assetic', array(
    'filters' => array(
        'jpegoptim' => array(
            'bin' => 'path/to/jpegoptim',
            'max' => '70',
        ),
    ),
));

Shorter Syntax: Twig Function

If you're using Twig, it's possible to achieve all of this with a shorter syntax by enabling and using a special Twig function. Start by adding the following configuration:

  • YAML
  • XML
  • PHP
1
2
3
4
5
6
7
8
# app/config/config.yml
assetic:
    filters:
        jpegoptim:
            bin: path/to/jpegoptim
    twig:
        functions:
            jpegoptim: ~
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:assetic="http://symfony.com/schema/dic/assetic"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/assetic
        http://symfony.com/schema/dic/assetic/assetic-1.0.xsd">

    <assetic:config>
        <assetic:filter
            name="jpegoptim"
            bin="path/to/jpegoptim" />
        <assetic:twig>
            <assetic:function
                name="jpegoptim" />
        </assetic:twig>
    </assetic:config>
</container>
1
2
3
4
5
6
7
8
9
10
11
// app/config/config.php
$container->loadFromExtension('assetic', array(
    'filters' => array(
        'jpegoptim' => array(
            'bin' => 'path/to/jpegoptim',
        ),
    ),
    'twig' => array(
        'functions' => array('jpegoptim'),
    ),
));

The Twig template can now be changed to the following:

1
<img src="{{ jpegoptim('@AppBundle/Resources/public/images/example.jpg') }}" alt="Example"/>

You can also specify the output directory for images in the Assetic configuration file:

  • YAML
  • XML
  • PHP
1
2
3
4
5
6
7
8
# app/config/config.yml
assetic:
    filters:
        jpegoptim:
            bin: path/to/jpegoptim
    twig:
        functions:
            jpegoptim: { output: images/*.jpg }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:assetic="http://symfony.com/schema/dic/assetic"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/assetic
        http://symfony.com/schema/dic/assetic/assetic-1.0.xsd">

    <assetic:config>
        <assetic:filter
            name="jpegoptim"
            bin="path/to/jpegoptim" />
        <assetic:twig>
            <assetic:function
                name="jpegoptim"
                output="images/*.jpg" />
        </assetic:twig>
    </assetic:config>
</container>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
// app/config/config.php
$container->loadFromExtension('assetic', array(
    'filters' => array(
        'jpegoptim' => array(
            'bin' => 'path/to/jpegoptim',
        ),
    ),
    'twig' => array(
        'functions' => array(
            'jpegoptim' => array(
                'output' => 'images/*.jpg',
            ),
        ),
    ),
));

Tip

For uploaded images, you can compress and manipulate them using the LiipImagineBundle community bundle.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
We stand with Ukraine.
Version:
No stress: we've got you covered with our 116 automated quality checks of your code

No stress: we've got you covered with our 116 automated quality checks of your code

Measure & Improve Symfony Code Performance

Measure & Improve Symfony Code Performance

↓ Our footer now uses the colors of the Ukrainian flag because Symfony stands with the people of Ukraine.

Avatar of Saem Ghani, a Symfony contributor

Thanks Saem Ghani for being a Symfony contributor

1 commit • 33 lines changed

View all contributors that help us make Symfony

Become a Symfony contributor

Be an active part of the community and contribute ideas, code and bug fixes. Both experts and newcomers are welcome.

Learn how to contribute

Symfony™ is a trademark of Symfony SAS. All rights reserved.

  • What is Symfony?
    • Symfony at a Glance
    • Symfony Components
    • Case Studies
    • Symfony Releases
    • Security Policy
    • Logo & Screenshots
    • Trademark & Licenses
    • symfony1 Legacy
  • Learn Symfony
    • Symfony Docs
    • Symfony Book
    • Reference
    • Bundles
    • Best Practices
    • Training
    • eLearning Platform
    • Certification
  • Screencasts
    • Learn Symfony
    • Learn PHP
    • Learn JavaScript
    • Learn Drupal
    • Learn RESTful APIs
  • Community
    • SymfonyConnect
    • Support
    • How to be Involved
    • Code of Conduct
    • Events & Meetups
    • Projects using Symfony
    • Downloads Stats
    • Contributors
    • Backers
  • Blog
    • Events & Meetups
    • A week of symfony
    • Case studies
    • Cloud
    • Community
    • Conferences
    • Diversity
    • Documentation
    • Living on the edge
    • Releases
    • Security Advisories
    • SymfonyInsight
    • Twig
    • SensioLabs
  • Services
    • SensioLabs services
    • Train developers
    • Manage your project quality
    • Improve your project performance
    • Host Symfony projects
    Deployed on
Follow Symfony
Search by Algolia