Dockerized PHP application runs as a Microservice to resize and crop images on the fly. Get optimised images with MozJPEG, WebP or PNG using ImageMagick. Includes face detection, cropping, face blurring, image rotation and many other options. Abstract storage based on FlySystem in order to store images on any provider (local, AWS S3...).

Project maintained by flyimg Hosted on GitHub Pages — Theme by mattgraham



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Image resizing, cropping and compression on the fly with the impressive MozJPEG compression algorithm. One Docker container to build your own Cloudinary-like service.

Fetch an image from anywhere; resize, compress, cache and serve… and serve, and serve, and serve…

You pass the image URL and a set of keys with options, like size or compression. Flyimg will fetch the image, convert it, store it, cache it and serve it. The next time the request comes, it will serve the cached version.

<!-- -->
<img src=",h_333,q_90/">

For example,h_250,c_1/


Table of Contents


You will need to have Docker on your machine. Optionally you can use Docker machine to create a virtual environment. We have tested on Mac, Windows and Ubuntu.

Installation [Deployment mode]

Pull the image

docker pull flyimg/flyimg-build

Start the container

docker run -itd -p 8080:80 flyimg/flyimg-build

Check how to provision the application

Installation [Development Mode]

You can spin up your own working server in 10 minutes using the provision scripts for AWS Elastic Beanstalk or the DigitalOcean Ubuntu Droplets (more environments to come). For other environments or if you want to tweak and play in your machine before rolling out, read along…


You can use git or composer for the first step.

with git

git clone

with composer

Create the project with composer create .

composer create-project flyimg/flyimg

CD into the folder and to build the docker image by running:

docker build -t flyimg .

This will download and build the main image, It will take a few minutes. If you get some sort of error related to files not found by apt-get or similar, try this same command again.

Then run the container:

docker run -itd -p 8080:80 -v $(pwd):/var/www/html --name flyimg flyimg

For Fish shell users:

docker run -itd -p 8080:80 -v $PWD:/var/www/html --name flyimg flyimg

The above command will make the Dockerfile run supervisord command which launches 2 processes: nginx and php-fpm and starts listening on port 8080.

IMPORTANT! If you cloned the project, only for the first time, you need to run composer install inside the container:

docker exec -it flyimg composer install

Again, it will take a few minutes to download the dependencies. Same as before, if you get some errors you should try running composer install again.

Testing Flyimg service

You can navigate to your machine’s IP in port 8080 (ex: ) ; you should get a message saying: Hello from Flyimg! and a small homepage of flyimg already working. If you get any errors at this stage it’s most likely that composer has not finished installing or skipped something.

You can test your image resizing service by navigating to:,h_113,q_90/


It’s working!

This is fetching an image from Mozilla, resizing it, saving it and serving it.

How to transform images

You go to your server URL and append /upload/; after that you can pass these options below, followed by an underscore and a value w_250,q_50 Options are separated by coma (configurable to other separator) . After the options put the source of your image, it can be relative to your server or absolute: / So to get a pretty kitten at 250 pixels wide, with 50% compression, you would write. <img src=",q_50/">

Options keys

  moz: mozjpeg
  q: quality
  o: output
  unsh: unsharp
  fc: face-crop
  fcp: face-crop-position
  fb: face-blur
  w: width
  h: height
  c: crop
  bg: background
  st: strip
  rz: resize
  g: gravity
  f: filter
  r: rotate
  sc: scale
  sf: sampling-factor
  rf: refresh
  ett: extent
  par: preserve-aspect-ratio
  pns: preserve-natural-size
  webpl: webp-lossless

Default options values

  mozjpeg: 1
  quality: 90
  output: auto
  unsharp: null
  face-crop: 0
  face-crop-position: 0
  face-blur: 0
  width: null
  height: null
  crop: null
  background: null
  strip: 1
  resize: null
  gravity: Center
  filter: Lanczos
  rotate: null
  scale: null
  sampling-factor: 1x1
  refresh: false
  extent: null
  preserve-aspect-ratio: 1
  preserve-natural-size: 1
  webp-lossless: 0

Option details

Most of these options are ImageMagick flags, many can get pretty advanced, use the ImageMagick docs. We put a lot of defaults in place to prevent distortion, bad quality

output string

default: auto : Output format requested, for example you can force the output as jpeg file in case of source file is png.


mozjpeg bool

default: 1 : Use moz-jpeg compression library, if false it fallback to the default ImageMagick compression algorithm.


quality int (0-100)

default: 90 : Sets the compression level for the output image. Your best results will be between 70 and 95.


q_30 :


q_100 :


width int

default: null : Sets the target width of the image. If not set, width will be calculated in order to keep aspect ratio.


w_100 :


height int

default: null : Sets the target height of the image. If not set, height will be calculated in order to keep aspect ratio.


h_100 :


Using width AND height

example:h_300,w_300 By default setting width and height together, works like defining a rectangle that will define a max-width and max-height and the image will scale propotionally to fit that area without cropping.

By default; width, height, or both will not scale up an image that is smaller than the defined dimensions.

h_300,w_300 :,w_300/


crop bool

default: false : When both width and height are set, this allows the image to be cropped so it fills the width x height area.


c_1,h_400,w_400 :,h_400,w_400/


gravity string

default: Center : When crop is applied, changing the gravity will define which part of the image is kept inside the crop area. The basic options are: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast.


   [...] -gravity NorthWest ...

background color (multiple formats)

default: white : Sets the background of the canvas for the cases where padding is added to the images. It supports hex, css color names, rgb. Only css color names are supported without quotation marks. For the hex code, the hash # character should be replaced by %23


  [...] -background red ...
  [...] -background "#ff4455" -> "%23ff4455"
  [...] -background "rgb(255,120,100)" ...,w_400,h_400,bg_red/


strip int

default: 1 : removes exif data and additional color profile.


resize int

default: null : The alternative resizing method to -thumbnail.


unsharp radiusxsigma{+gain}{+threshold}

default: null : Sharpens an image with a convolved Gausian operator. A good example 0.25x0.25+8+0.065.


   [...] -unsharp 0.25x0.25+8+0.065 ...

filter string

default: Lanczos : Resizing algorithm, Triangle is a smoother lighter option


   [...] -filter Triangle

scale int

default: null : The “-scale” resize operator is a simplified, faster form of the resize command. Useful for fast exact scaling of pixels.


rotate string

default: null : Apply image rotation (using shear operations) to the image.

example: r_90, r_-180,…

r_45 :,w_400,h_400/


refresh int

default: false : Refresh will delete the local cached copy of the file requested and will generate the image again. Also it will send headers with the command done on the image + info returned by the command identity from IM.


Face Crop int

default: false : Using facedetect repository to detect faces and passe the coordinates to ImageMagick to crop.


fc_1 :


Face Crop Position int

default: false : When using the Face crop option and when the image contain more than one face, you can specify which one you want get cropped


fcp_2 :,fcp_2/


Face Blur int

default: false : Apply blur effect on faces in a given image


fb_1 :


Enable Restricted Domains

Restricted domains disabled by default. This means that you can fetch a resource from any URL. To enable the domain restriction, change in config/parameters.yml

restricted_domains: true

After enabling, you need to put the white listed domains


Run test:

docker exec -it flyimg vendor/bin/phpunit tests/

How to Provision the application on

Technology stack

Abstract storage with Flysystem

Storage files based on Flysystem which is a filesystem abstraction allows you to easily swap out a local filesystem for a remote one. Technical debt is reduced as is the chance of vendor lock-in.

Default storage is Local, but you can use other Adapters like AWS S3, Azure, FTP, Dropbox, …

Currently, only the local and S3 are implemented as Storage Provider in Flyimg application, but you can add your specific one easily in src/Core/Provider/StorageProvider.php

Using AWS S3 as Storage Provider

in parameters.yml change the storage_system option from local to s3, and fill in the aws_s3 options :

storage_system: s3

  access_id: "s3-access-id"
  secret_key: "s3-secret-id"
  region: "s3-region"
  bucket_name: "s3-bucket-name"


See for more details Requires: Vegeta

Crop http://localhost:8080/upload/w_200,h_200,c_1,/Rovinj-Croatia.jpg
Requests      [total, rate]            500, 50.10
Duration      [total, attack, wait]    9.987040447s, 9.979999952s, 7.040495ms
Latencies     [mean, 50, 95, 99, max]  30.374428ms, 7.118491ms, 198.48037ms, 403.203168ms, 667.636703ms
Bytes In      [total, mean]            86208, 172.42
Bytes Out     [total, mean]            0, 0.00
Success       [ratio]                  100.00%
Status Codes  [code:count]             200:500

Resize http://localhost:8080/upload/w_200,h_200,rz_1/Rovinj-Croatia.jpg
Requests      [total, rate]            500, 50.10
Duration      [total, attack, wait]    9.986398956s, 9.979999972s, 6.398984ms
Latencies     [mean, 50, 95, 99, max]  14.058886ms, 7.27949ms, 26.480589ms, 218.968846ms, 289.695028ms
Bytes In      [total, mean]            101675, 203.35
Bytes Out     [total, mean]            0, 0.00
Success       [ratio]                  100.00%
Status Codes  [code:count]             200:500

Rotate http://localhost:8080/upload/r_-45,w_400,h_400/Rovinj-Croatia.jpg
Requests      [total, rate]            500, 50.10
Duration      [total, attack, wait]    10.851828209s, 9.97999994s, 871.828269ms
Latencies     [mean, 50, 95, 99, max]  2.286214264s, 2.140216211s, 4.513043865s, 7.226125489s, 7.251871479s
Bytes In      [total, mean]            987720, 1975.44
Bytes Out     [total, mean]            0, 0.00
Success       [ratio]                  100.00%
Status Codes  [code:count]             200:500

Demo Application running




This project exists thanks to all the people who contribute.


Thank you to all our backers! [Become a backer]


Thank you to all our sponsors! (please ask your company to also support this open source project by becoming a sponsor)

Licence: MIT

Enjoy your Flyimaging!