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Official Ruby SDK for Filestack - API and content management system that makes it easy to add powerful file uploading and transformation capabilities to any web or mobile application.



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Filestack Ruby SDK

Ruby SDK for Filestack API and content management system.

Important: This is the readme for 2.1.0. A recent change (2.1.0) has renamed the Client to FilestackClient, and the Filelink to FilestackFilelink. Please make neccessary changes before upgrading to newest release if you run 2.0.1 or 2.0.0. This was to address namespace concerns by users with models and attributes named Client, and to be more consistent.


  • A multi-part uploader powered on the backend by the Filestack CIN.
  • An interface to the Filestack Processing Engine for transforming assets via URLs.
  • The Filestack Picker - an upload widget for the web that integrates over a dozen cloud providers and provides pre-upload image editing.


Add this line to your application's Gemfile:

gem 'filestack'

And then execute:

$ bundle

Or install it yourself as:

$ gem install filestack



require 'filestack'

Intialize the client using your API key, and security if you are using it.

client ='YOUR_API_KEY', security: security_object)


filelink = client.upload(filepath: '/path/to/localfile')

# OR

filelink = client.upload(external_url: '')

# Return response body on upload complete
puts filelink.upload_response

# Return uploaded filelink handle
puts filelink.handle

To upload a local, an IO object and an external file with following optional options:

options = {
  filename: 'string',
  location: 'string',
  path: 'string',
  container: 'string',
  mimetype: 'string',
  region: 'string',
  workflows: ['workflow-id-1', 'workflow-id-2'],
  upload_tags: {
    key: 'value',
    key2: 'value'

filelink = client.upload(filepath: '/path/to/localfile', options: { mimetype: 'image/png', filename: 'custom_filename.png' })

filelink = client.upload(external_url: '', options: { mimetype: 'image/jpeg', filename: 'custom_filename.png' })

To store file on dropbox, azure, gcs or rackspace, you must have the chosen provider configured in the developer portal to enable this feature. By default the file is stored on s3. You can add more details of the storage in options.

filelink = client.upload(filepath: '/path/to/file', storage: 's3', options: { path: 'folder_name/', container: 'container_name', location: 's3', region: 'region_name' })

filelink = client.upload(external_url: '', options: { location: 'dropbox', path: 'folder_name' })


Workflows allow you to wire up conditional logic and image processing to enforce business processes, automate ingest, and save valuable development time. In order to trigger the workflow job for each upload:

filelink = client.upload(filepath: '/path/to/file', options: { workflows: ["workflow_id_1", "workflow_id_2"] })


filelink = client.upload(external_url: '', options: { workflows: ["workflow_id_1"] })

# Return workflows jobids on upload complete
puts filelink.upload_response["workflows"]


If security is enabled on your account, or if you are using certain actions that require security (delete, overwrite and certain transformations), you will need to create a security object and pass it into the client on instantiation.

security ='YOUR_APP_SECRET', options: {call: %w[read store pick runWorkflow]})
client ='YOUR_API_KEY', security: security)

Using FilestackFilelinks

FilestackFilelink objects are representation of a file handle. You can download, get raw file content, delete and overwrite file handles directly. Security is required for overwrite and delete methods.

Initialize the filelink using the file handle, your API key, and security if required. The file handle is the string following the last slash / in the file URL.

filelink =, apikey: 'YOUR_API_KEY', security: security_object)


You can delete a file by simply calling delete on the filelink.



Transforms can be initiated one of two ways. The first, by calling transform on a filelink:

transform = filelink.transform

Or by using an external URL via the client:

transform = client.transform_external('')

Transformations can be chained together as you please.

transform = filelink.transform.resize(width: 100, height: 100).flip.enhance

You can retrieve the URL of a transform object:


Or you can store (upload) the transformation as a new filelink:

new_filelink =

For a list of valid transformations, please see here.


Return default file if the source of the transformation does not work or the transformation fails. To use fallback, you should provide handle of the file that should be returned. Optionally, you can add cache, which means number of seconds fallback response should be cached in CDN.

transform = client.transform_external('').fallback(file: 'DEFAULT_HANDLE_OR_FILEPATH')

If you are using fallback handle that belongs to different application than the one which runs transformation (APIKEY) and it is secured with security policy, appropriate signature and policy with read call should be used:

transform = client.transform_external('').fallback(file: 'DEFAULT_HANDLE_OR_FILEPATH?policy=HANDLE_APIKEY_POLICY&signature=HANDLE_APIKEY_SIGNATURE', cache: 10)


Sets Content-Disposition header for given file.

transform = filelink.transform.content(filename: 'DEFAULT_FILENAME', type: 'TYPE')


If you have auto-tagging enabled onto your account, it can be called on any filelink object (tags don't work on external URLs).

tags = filelink.tags

This will return a hash with labels and their associated confidence:

    "auto" => {
        "big cats"=>79,
        "cat like mammal"=>92,
        "fauna"=>86, "mammal"=>92,
        "small to medium sized cats"=>89,
    "user" => nil

SFW is called the same way, but returns a boolean value (true == safe-for-work, false == not-safe-for-work).

sfw = filelink.sfw


Filestack Ruby SDK follows the Semantic Versioning.


If you have problems, please create a Github Issue.


Official Ruby SDK for Filestack - API and content management system that makes it easy to add powerful file uploading and transformation capabilities to any web or mobile application.








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