README

This package can optimize PNGs, JPGs, WEBPs, AVIFs, SVGs and GIFs by running them through a chain of various image optimization tools. Here's how you can use it:

use Spatie\ImageOptimizer\OptimizerChainFactory;

$optimizerChain = OptimizerChainFactory::create();

$optimizerChain->optimize($pathToImage);

The image at $pathToImage will be overwritten by an optimized version which should be smaller. The package will automatically detect which optimization binaries are installed on your system and use them.

Here are some example conversions that have been done by this package.

Loving Laravel? Then head over to the Laravel specific integration.

Using WordPress? Then try out the WP CLI command.

SilverStripe enthusiast? Don't waste time, go to the SilverStripe module.

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We highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using. You'll find our address on our contact page. We publish all received postcards on our virtual postcard wall.

Installation

You can install the package via composer:

composer require spatie/image-optimizer

Optimization tools

The package will use these optimizers if they are present on your system:

• JpegOptim
• Optipng
• Pngquant 2
• SVGO 1
• Gifsicle
• cwebp
• avifenc

Here's how to install all the optimizers on Ubuntu/Debian:

sudo apt-get install jpegoptim
sudo apt-get install optipng
sudo apt-get install pngquant
sudo npm install -g svgo
sudo apt-get install gifsicle
sudo apt-get install webp
sudo apt-get install libavif-bin # minimum 0.9.3

And here's how to install the binaries on MacOS (using Homebrew):

brew install jpegoptim
brew install optipng
brew install pngquant
npm install -g svgo
brew install gifsicle
brew install webp
brew install libavif

And here's how to install the binaries on Fedora/RHEL/CentOS:

sudo dnf install epel-release
sudo dnf install jpegoptim
sudo dnf install optipng
sudo dnf install pngquant
sudo npm install -g svgo
sudo dnf install gifsicle
sudo dnf install libwebp-tools
sudo dnf install libavif-tools

Which tools will do what?

The package will automatically decide which tools to use on a particular image.

JPGs

JPGs will be made smaller by running them through JpegOptim. These options are used:

• -m85: this will store the image with 85% quality. This setting seems to satisfy Google's Pagespeed compression rules
• --strip-all: this strips out all text information such as comments and EXIF data
• --all-progressive: this will make sure the resulting image is a progressive one, meaning it can be downloaded using multiple passes of progressively higher details.

PNGs

PNGs will be made smaller by running them through two tools. The first one is Pngquant 2, a lossy PNG compressor. We set no extra options, their defaults are used. After that we run the image through a second one: Optipng. These options are used:

• -i0: this will result in a non-interlaced, progressive scanned image
• -o2: this set the optimization level to two (multiple IDAT compression trials)

SVGs

SVGs will be minified by SVGO. SVGO's default configuration will be used, with the omission of the cleanupIDs and removeViewBox plugins because these are known to cause troubles when displaying multiple optimized SVGs on one page.

Please be aware that SVGO can break your svg. You'll find more info on that in this excellent blogpost by Sara Soueidan.

GIFs

GIFs will be optimized by Gifsicle. These options will be used:

• -O3: this sets the optimization level to Gifsicle's maximum, which produces the slowest but best results

WEBPs

WEBPs will be optimized by Cwebp. These options will be used:

• -m 6 for the slowest compression method in order to get the best compression.
• -pass 10 for maximizing the amount of analysis pass.
• -mt multithreading for some speed improvements.
• -q 90 Quality factor that brings the least noticeable changes.

(Settings are original taken from here)

AVIFs

AVIFs will be optimized by avifenc. These options will be used:

• -a cq-level=23: Constant Quality level. Lower values mean better quality and greater file size (0-63).
• -j all: Number of jobs (worker threads, all uses all available cores).
• --min 0: Min quantizer for color (0-63).
• --max 63: Max quantizer for color (0-63).
• --minalpha 0: Min quantizer for alpha (0-63).
• --maxalpha 63: Max quantizer for alpha (0-63).
• -a end-usage=q Rate control mode set to Constant Quality mode.
• -a tune=ssim: SSIM as tune the encoder for distortion metric.

(Settings are original taken from here and here)

Usage

This is the default way to use the package:

use Spatie\ImageOptimizer\OptimizerChainFactory;

$optimizerChain = OptimizerChainFactory::create();

$optimizerChain->optimize($pathToImage);

The image at $pathToImage will be overwritten by an optimized version which should be smaller.

The package will automatically detect which optimization binaries are installed on your system and use them.

To keep the original image, you can pass through a second argumentoptimize:

use Spatie\ImageOptimizer\OptimizerChainFactory;

$optimizerChain = OptimizerChainFactory::create();

$optimizerChain->optimize($pathToImage, $pathToOutput);

In that example the package won't touch $pathToImage and write an optimized version to $pathToOutput.

Setting a timeout

You can set the maximum of time in seconds that each individual optimizer in a chain can use by calling setTimeout:

$optimizerChain
    ->setTimeout(10)
    ->optimize($pathToImage);

In this example each optimizer in the chain will get a maximum 10 seconds to do it's job.

Creating your own optimization chains

If you want to customize the chain of optimizers you can do so by adding Optimizers manually to an OptimizerChain.

Here's an example where we only want optipng and jpegoptim to be used:

use Spatie\ImageOptimizer\OptimizerChain;
use Spatie\ImageOptimizer\Optimizers\Jpegoptim;
use Spatie\ImageOptimizer\Optimizers\Pngquant;

$optimizerChain = (new OptimizerChain)
   ->addOptimizer(new Jpegoptim([
       '--strip-all',
       '--all-progressive',
   ]))

   ->addOptimizer(new Pngquant([
       '--force',
   ]))

Notice that you can pass the options an Optimizer should use to its constructor.

Writing a custom optimizers

Want to use another command line utility to optimize your images? No problem. Just write your own optimizer. An optimizer is any class that implements the Spatie\ImageOptimizer\Optimizers\Optimizer interface:

namespace Spatie\ImageOptimizer\Optimizers;

use Spatie\ImageOptimizer\Image;

interface Optimizer
{
    /**
     * Returns the name of the binary to be executed.
     *
     * @return string
     */
    public function binaryName(): string;

    /**
     * Determines if the given image can be handled by the optimizer.
     *
     * @param \Spatie\ImageOptimizer\Image $image
     *
     * @return bool
     */
    public function canHandle(Image $image): bool;

    /**
     * Set the path to the image that should be optimized.
     *
     * @param string $imagePath
     *
     * @return $this
     */
    public function setImagePath(string $imagePath);

    /**
     * Set the options the optimizer should use.
     *
     * @param array $options
     *
     * @return $this
     */
    public function setOptions(array $options = []);

    /**
     * Get the command that should be executed.
     *
     * @return string
     */
    public function getCommand(): string;
}

If you want to view an example implementation take a look at the existing optimizers shipped with this package.

You can easily add your optimizer by using the addOptimizer method on an OptimizerChain.

use Spatie\ImageOptimizer\ImageOptimizerFactory;

$optimizerChain = OptimizerChainFactory::create();

$optimizerChain
   ->addOptimizer(new YourCustomOptimizer())
   ->optimize($pathToImage);

Logging the optimization process

By default the package will not throw any errors and just operate silently. To verify what the package is doing you can set a logger:

use Spatie\ImageOptimizer\OptimizerChainFactory;

$optimizerChain = OptimizerChainFactory::create();

$optimizerChain
   ->useLogger(new MyLogger())
   ->optimize($pathToImage);

A logger is a class that implements Psr\Log\LoggerInterface. A good logging library that's fully compliant is Monolog. The package will write to log which Optimizers are used, which commands are executed and their output.

Example conversions

Here are some real life example conversions done by this package.

Methodology for JPG, WEBP, AVIF images: the original image has been fed to spatie/image (using the default GD driver) and resized to 2048px width:

Spatie\Image\Image::load('original.jpg')
    ->width(2048)
    ->save('image.jpg'); // image.png, image.webp, image.avif

jpg

Original
771 KB

Optimized
511 KB (-33.7%, DSSIM: 0.00052061)

credits: Jeff Sheldon, via Unsplash

webp

Original
461 KB

Optimized
184 KB (-60.0%, DSSIM: 0.00166036)

credits: Jeff Sheldon, via Unsplash

avif

Original
725 KB

Optimized
194 KB (-73.2%, DSSIM: 0.00163751)

credits: Jeff Sheldon, via Unsplash

png

Original: Photoshop 'Save for web' | PNG-24 with transparency
39 KB

Optimized
16 KB (-59%, DSSIM: 0.00000251)

svg

Original: Illustrator | Web optimized SVG export
25 KB

Optimized
20 KB (-21.5%)

Changelog

Please see CHANGELOG for more information what has changed recently.

Testing

composer test

Contributing

Please see CONTRIBUTING for details.

Security

If you've found a bug regarding security please mail security@spatie.be instead of using the issue tracker.

Postcardware

You're free to use this package (it's MIT-licensed), but if it makes it to your production environment we highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using.

Our address is: Spatie, Kruikstraat 22, 2018 Antwerp, Belgium.

We publish all received postcards on our company website.

Credits

• Freek Van der Herten
• All Contributors

This package has been inspired by psliwa/image-optimizer

Emotional support provided by Joke Forment

License

The MIT License (MIT). Please see License File for more information.