Write meta data to an image

Writing meta data to files is easy with the /meta/write Robot. You just need to supply the data_to_write parameter and set the keys and values that you want to write to the file. Please upload a file below. Once the encoding completes, see how the copyright notice is now part of the extracted metadata of the result file.

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This demo uses:

Our /meta/write Robot, which write meta data into any file that supports it

This demo uses :original, a magic word indicating uploads that were received by Transloadit.

<body>
  <form action="/uploads" enctype="multipart/form-data" method="POST">
    <input type="file" name="my_file" multiple="multiple" />
  </form>

  <script src="//ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
  <script src="//assets.transloadit.com/js/jquery.transloadit2-v3-latest.js"></script>
  <script type="text/javascript">
  $(function() {
    $('form').transloadit({
      wait: true,
      triggerUploadOnFileSelection: true,
      params: {
        auth: {
          // Secure via: https://transloadit.com/docs/api-docs/#authentication
          key: 'YOUR_TRANSLOADIT_KEY',
        },
        // It's often better to use a `template_id` than to
        // inline encoding instructions here:
        steps: {
          thumb: {
            use: ':original',
            robot: '/meta/write',
            result: true,
            data_to_write: {'copyright':'Copyright 2017 Transloadit'}
          }
        }
      }
    });
  });
  </script>
</body>

<link href="https://unpkg.com/uppy/dist/uppy.min.css" rel="stylesheet">
<script src="https://unpkg.com/uppy/dist/uppy.min.js"></script>
<button id="uppy-open-modal">Select Files</button>
<script>
  const uppy = Uppy.Core({ debug: true, autoProceed: false })
    .use(Uppy.Tus10, { resume: false })
    .use(Uppy.Transloadit, {
      params: {
        auth: {
          key: 'YOUR_TRANSLOADIT_KEY',
        },
        steps: {
          thumb: {
            use: ':original',
            robot: '/meta/write',
            result: true,
            data_to_write: {'copyright':'Copyright 2017 Transloadit'}
          }
        }
      },
      waitForEncoding: true,
    })
    .use(Uppy.Dashboard, {
      trigger: '#uppy-open-modal',
      target: 'body'
    })
    .use(Uppy.Webcam, { target: Dashboard })
    .on('transloadit:result', (stepName, result) => {
      // use transloadit encoding result here.
      console.log('Result here ====>', stepName, result)
    })
    .run()
</script>

// npm install transloadit --save
const TransloaditClient = require('transloadit')

const transloadit = new TransloaditClient({
  authKey: 'YOUR_TRANSLOADIT_KEY',
  authSecret: 'YOUR_TRANSLOADIT_SECRET'
})

transloadit.addFile('myinput_1', './lolcat.jpg')

const options = {
  params: {
    steps: {
      thumb: {
        use: ':original',
        robot: '/meta/write',
        result: true,
        data_to_write: {'copyright':'Copyright 2017 Transloadit'}
      }
    }
  }
}

transloadit.createAssembly(options, (err, result) => {
  if (err) {
    throw err
  }

  console.log({result})
})

// Install "transloadit/php-sdk"
// via Composer (https://getcomposer.org)
use transloadit\Transloadit;
$transloadit = new Transloadit(array(
  "key" => "YOUR_TRANSLOADIT_KEY",
  "secret" => "YOUR_TRANSLOADIT_SECRET",
));

$files = array();
array_push($files, "./lolcat.jpg");

$response = $transloadit->createAssembly(array(
  "files" => $files,
  "params" => array(
    "steps" => json_decode({
      "thumb": {
        "use": ":original",
        "robot": "/meta/write",
        "result": true,
        "data_to_write": {
          "copyright": "Copyright 2017 Transloadit"
        }
      }
    }, true),
  ),
));

# gem install transloadit
transloadit = Transloadit.new(
  :key => "YOUR_TRANSLOADIT_KEY",
  :secret => "YOUR_TRANSLOADIT_SECRET"
)

thumb = transloadit.step "thumb", "/meta/write",
  :use => ":original",
  :result => true,
  :data_to_write => {"copyright":"Copyright 2017 Transloadit"}
)

assembly = transloadit.assembly(
  :steps => [ thumb ]
)

files = []
files.push('./lolcat.jpg')

response = assembly.create! *files

until response.finished?
  sleep 1; response.reload!
end

if !response.error?
  # handle success
end

from transloadit import client

tl = client.Transloadit('YOUR_TRANSLOADIT_KEY', 'YOUR_TRANSLOADIT_SECRET')
assembly = tl.new_assembly()

# Add files to upload
assembly.add_file(open('./lolcat.jpg', 'rb'))

# Add instructions, e.g. resize image, or encode video
assembly.add_step('thumb', {
  'use': ':original',
  'robot': '/meta/write',
  'result': true,
  'data_to_write': {'copyright':'Copyright 2017 Transloadit'}
})

# Start the Assembly
assembly_response = assembly.create(retries=5, wait=True)

print assembly_response.data.get('assembly_id')

# or
print assembly_response.data['assembly_id']

// go get gopkg.in/transloadit/go-sdk.v1
options := transloadit.DefaultConfig
options.AuthKey = "YOUR_TRANSLOADIT_KEY"
options.AuthSecret = "YOUR_TRANSLOADIT_SECRET"
client := transloadit.NewClient(options)

// Initialize new assembly
assembly := transloadit.NewAssembly()

// Add files to upload
assembly.AddFile("myinput_1", "./lolcat.jpg")

// Add instructions, e.g. resize image, or encode video
assembly.AddStep("thumb", map[string]interface{}{
  "use": ":original",
  "robot": "/meta/write",
  "result": true,
  "data_to_write": {"copyright":"Copyright 2017 Transloadit"}
})

// Start the Assembly
info, err := client.StartAssembly(context.Background(), assembly)
if err != nil {
  panic(err)
}

// All files have now been uploaded and the assembly has started but no
// results are available yet since the conversion has not finished.
// WaitForAssembly provides functionality for polling until the assembly
// has ended.
info, err = client.WaitForAssembly(context.Background(), info)
if err != nil {
  panic(err)
}

fmt.Printf("You can view the result at: %s\n", info.Results["resize"][0].SSLURL)

// compile 'com.transloadit.sdk:transloadit:0.0.3'
import com.transloadit.sdk.Assembly;
import com.transloadit.sdk.Transloadit;
import com.transloadit.sdk.exceptions.LocalOperationException;
import com.transloadit.sdk.exceptions.RequestException;
import com.transloadit.sdk.response.AssemblyResponse;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        Transloadit transloadit = new Transloadit("YOUR_TRANSLOADIT_KEY", "YOUR_TRANSLOADIT_SECRET");
        Assembly assembly = transloadit.newAssembly();
        
        Map<String, Object> thumbStepOptions = new HashMap<>();
        thumbStepOptions.put("use", ":original");
        thumbStepOptions.put("result", true);
        thumbStepOptions.put("data_to_write", new String[]{ "copyrightCopyright 2017 Transloadit" });
        assembly.addStep("thumb", "/meta/write", thumbStepOptions);
        
        assembly.addFile(new File("./lolcat.jpg"));
        
        try {
            AssemblyResponse response = assembly.save();

            // wait for assembly to finish executing.
            while (!response.isFinished()) {
                response = transloadit.getAssemblyByUrl(response.getSslUrl());
            }

            System.out.println(response.getId());
            System.out.println(response.getUrl());
            System.out.println(response.json());
        } catch (RequestException | LocalOperationException e) {
            // handle exception here
        }
    }
}

npm install transloadify -g

echo '{
  "thumb": {
    "use": ":original",
    "robot": "/meta/write",
    "result": true,
    "data_to_write": {
      "copyright": "Copyright 2017 Transloadit"
    }
  }
}' > ./steps.json

export TRANSLOADIT_KEY="YOUR_TRANSLOADIT_KEY"
export TRANSLOADIT_SECRET="YOUR_TRANSLOADIT_SECRET"

transloadify \
  --input ./lolcat.jpg \
  --output ./resized-lolcat.jpg \
  --steps ./steps.json

{
  "steps": {
    "thumb": {
      "use": ":original",
      "robot": "/meta/write",
      "result": true,
      "data_to_write": {
        "copyright": "Copyright 2017 Transloadit"
      }
    }
  }
}

So many ways to integrate

Transloadit is a service for companies with developers. As a developer, there's many ways you can put us to good use.

Bulk imports — Add one of our import Robots to acquire the input and encode massive libraries
Handling uploads — We invented tus and are experts at handling uploads
Front-end integration — We integrate with webbrowsers via our next-gen file uploader Uppy and SDKs for Android and iOS
Backend-end integration — Send us batch jobs in any server language using one of our SDKs or directly interfacing with our REST API
Pingbacks — Configure a notify_url to let your server receive transcoding results JSON in the transloadit POST field.

Try it out

Maximum size for all demos is 100MB.

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