High-quality FLAC encoding

Transloadit offers a FLAC preset to easily encode audio files into FLAC.

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1. Handle uploads

We can handle uploads of your users directly. Learn more ›

Warning It seems your browser does not support the codec used in this video of the demo. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.

joakim_karud-rock_angel.mp3

9.3 MB · 3m53s · Rock Angel by Joakim Karud

":original": {
  "robot": "/upload/handle"
}

/upload/handle Robot

This bot receives uploads that your users throw at you from browser or apps, or that you throw at us programmatically

2. Encode audio to FLAC

We offer a variety of features to reduce audio size while maintaining quality, as well as add effects like loops or watermarks. Learn more ›

Warning It seems your browser does not support the codec used in this video of the demo. For demo simplicity we'll link you to the original file, but you may also want to learn how to make videos compatible for all browsers.

joakim_karud-rock_angel-0.flac

24 MB · 3m53s

"flac_encoded": {
  "use": ":original",
  "robot": "/audio/encode",
  "result": true,
  "preset": "flac",
  "ffmpeg_stack": "v3.3.3"
}

/audio/encode Robot

This bot converts audio files into all kinds of formats for you. We provide encoding presets for the most common formats

3. Export files to Amazon S3

We export to the storage platform of your choice. Learn more ›

:original

demos.transloadit.com/3d/059e21f91d44b695c5a522ee2705c5/joakim_karud-rock_angel.mp3

flac_encoded

demos.transloadit.com/8f/254c0b344344f8bbd88d83ad2a25b3/joakim_karud-rock_angel.flac

Once all files have been exported, we can ping a URL of your choice with the Assembly status JSON.

"exported": {
  "use": [
    "flac_encoded",
    ":original"
  ],
  "robot": "/s3/store",
  "credentials": "YOUR_AWS_CREDENTIALS",
  "url_prefix": "https://demos.transloadit.com/"
}

/s3/store Robot

This bot exports encoding results to Amazon S3

Since this is a store Robot, be sure to use Template Credentials so that any sensitive data is encrypted and stored in our database, making sure that they’re never exposed to any end-user.

Live Demo. See for yourself

This live demo is powered by Uppy, our open source file uploader that you can also use without Transloadit, and tus, our open protocol for resumable file uploads that is making uploading more reliable across the world.

Build this in your own language

{
  ":original": {
    "robot": "/upload/handle"
  },
  "flac_encoded": {
    "use": ":original",
    "robot": "/audio/encode",
    "result": true,
    "preset": "flac",
    "ffmpeg_stack": "v3.3.3"
  },
  "exported": {
    "use": [
      "flac_encoded",
      ":original"
    ],
    "robot": "/s3/store",
    "credentials": "YOUR_AWS_CREDENTIALS",
    "url_prefix": "https://demos.transloadit.com/"
  }
}

// Add 'Transloadit' to your Podfile, run 'pod install', add credentials to 'Info.plist'
import Arcane
import TransloaditKit

// Set Encoding Instructions
var AssemblySteps: Array = Array<Step>() // An array to hold the Steps

var Step1 = Step (key: ":original") // Create a Step object
Step1?.setValue("/upload/handle", forOption: "robot") // Add the details
AssemblySteps.append(Step1) // Add the Step to the array

var Step2 = Step (key: "flac_encoded") // Create a Step object
Step2?.setValue(":original", forOption: "use") // Add the details
Step2?.setValue("/audio/encode", forOption: "robot") // Add the details
Step2?.setValue(true, forOption: "result") // Add the details
Step2?.setValue("v3.3.3", forOption: "ffmpeg_stack") // Add the details
Step2?.setValue("flac", forOption: "preset") // Add the details
AssemblySteps.append(Step2) // Add the Step to the array

var Step3 = Step (key: "exported") // Create a Step object
Step3?.setValue(["flac_encoded",":original"], forOption: "use") // Add the details
Step3?.setValue("/s3/store", forOption: "robot") // Add the details
Step3?.setValue("YOUR_AWS_CREDENTIALS", forOption: "credentials") // Add the details
Step3?.setValue("https://demos.transloadit.com/", forOption: "url_prefix") // Add the details
AssemblySteps.append(Step3) // Add the Step to the array

// We then create an Assembly Object with the Steps and files
var MyAssembly: Assembly = Assembly(steps: AssemblySteps, andNumberOfFiles: 1)

// Add files to upload
MyAssembly.addFile("./joakim_karud-rock_angel.mp3")

// Start the Assembly
Transloadit.createAssembly(MyAssembly) 

// Fires after your Assembly has completed
transloadit.assemblyStatusBlock = {(_ completionDictionary: [AnyHashable: Any]) -> Void in
  print("\(completionDictionary.description)")
}

Read docs: TransloaditKit

<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: {
          // To avoid tampering use signatures:
          // https://transloadit.com/docs/api/#authentication
          key: 'YOUR_TRANSLOADIT_KEY',
        },
        // It's often better store encoding instructions in your account
        // and use a `template_id` instead of adding these steps inline
        steps: {
          ':original': {
            robot: '/upload/handle'
          },
          flac_encoded: {
            use: ':original',
            robot: '/audio/encode',
            result: true,
            ffmpeg_stack: 'v3.3.3',
            preset: 'flac'
          },
          exported: {
            use: ['flac_encoded',':original'],
            robot: '/s3/store',
            credentials: 'YOUR_AWS_CREDENTIALS',
            url_prefix: 'https://demos.transloadit.com/'
          }
        }
      }
    });
  });
  </script>
</body>

Read docs: jQuery SDK

<!--
We'll be inlining the following Assembly Instructions into a hidden `params` field,
escaping HTML entities such as `<`, a task best left to machines : )

{ 
  "auth": { "key": "YOUR_TRANSLOADIT_KEY" }, 
  "redirect_url": "https://example.com/success", 
  "steps": {
    ":original": {
      "robot": "/upload/handle"
    },
    "flac_encoded": {
      "use": ":original",
      "robot": "/audio/encode",
      "result": true,
      "preset": "flac",
      "ffmpeg_stack": "v3.3.3"
    },
    "exported": {
      "use": [
        "flac_encoded",
        ":original"
      ],
      "robot": "/s3/store",
      "credentials": "YOUR_AWS_CREDENTIALS",
      "url_prefix": "https://demos.transloadit.com/"
    }
  }
}
-->

<form method="POST" enctype="multipart/form-data" action="https://api2.transloadit.com/assemblies">
  <input type="hidden" name="params" value='{ &quot;auth&quot;: { &quot;key&quot;: &quot;YOUR_TRANSLOADIT_KEY&quot; }, &quot;redirect_url&quot;: &quot;https://example.com/success&quot;, &quot;steps&quot;: {&quot;:original&quot;: { &quot;robot&quot;: &quot;/upload/handle&quot;},&quot;flac_encoded&quot;: { &quot;use&quot;: &quot;:original&quot;, &quot;robot&quot;: &quot;/audio/encode&quot;, &quot;result&quot;: true, &quot;preset&quot;: &quot;flac&quot;, &quot;ffmpeg_stack&quot;: &quot;v3.3.3&quot;},&quot;exported&quot;: { &quot;use&quot;: [ &quot;flac_encoded&quot;, &quot;:original&quot; ], &quot;robot&quot;: &quot;/s3/store&quot;, &quot;credentials&quot;: &quot;YOUR_AWS_CREDENTIALS&quot;, &quot;url_prefix&quot;: &quot;https://demos.transloadit.com/&quot;}}}' />
  <input type="file" name="myfile_1" multiple="multiple" />
  <input type="submit" value="Upload" />
</form>

Read docs: Multipart Form

<!-- This pulls Uppy from our CDN. Alternatively use `npm i @uppy/robodog --save` -->
<!-- if you want smaller self-hosted bundles and/or to use modern JavaScript -->
<link href="//transloadit.edgly.net/releases/uppy/robodog/v1.5.1/robodog.min.css" rel="stylesheet">
<script src="//transloadit.edgly.net/releases/uppy/robodog/v1.5.1/robodog.min.js"></script>
<button id="browse">Select Files</button>
<script>
  document.getElementById('browse').addEventListener('click', function () {
    var uppy = window.Robodog.pick({
      providers: [ 'instagram', 'url', 'webcam', 'dropbox', 'google-drive' ],
      waitForEncoding: true,
      params: {
        // To avoid tampering, use Signature Authentication
        auth: { key: 'YOUR_TRANSLOADIT_KEY' },
        // To hide your `steps`, use a `template_id` instead
        steps: {
          ':original': {
            robot: '/upload/handle'
          },
          flac_encoded: {
            use: ':original',
            robot: '/audio/encode',
            result: true,
            ffmpeg_stack: 'v3.3.3',
            preset: 'flac'
          },
          exported: {
            use: ['flac_encoded', ':original'],
            robot: '/s3/store',
            credentials: 'YOUR_AWS_CREDENTIALS',
            url_prefix: 'https://demos.transloadit.com/'
          }
        }
      }
    }).then(function (bundle) {
      // Due to `waitForEncoding: true` this is fired after encoding is done.
      // Alternatively, set `waitForEncoding` to `false` and provide a `notify_url`
      // for Async Mode where your back-end receives the encoding results
      // so that your user can be on their way as soon as the upload completes.
      console.log(bundle.transloadit) // Array of Assembly Statuses
      console.log(bundle.results)     // Array of all encoding results
    }).catch(console.error)
  })
</script>

Read docs: Uppy File Uploader

// yarn add transloadit || npm i transloadit --save-exact
const Transloadit = require('transloadit')

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

// Set Encoding Instructions
const options = {
  params: {
    steps: {
      ':original': {
        robot: '/upload/handle',
      },
      flac_encoded: {
        use: ':original',
        robot: '/audio/encode',
        result: true,
        ffmpeg_stack: 'v3.3.3',
        preset: 'flac',
      },
      exported: {
        use: ['flac_encoded',':original'],
        robot: '/s3/store',
        credentials: 'YOUR_AWS_CREDENTIALS',
        url_prefix: 'https://demos.transloadit.com/',
      },
    }
  }
}

// Add files to upload
transloadit.addFile('myfile_1', './joakim_karud-rock_angel.mp3')

// Start the Assembly
transloadit.createAssembly(options, (err, result) => {
  if (err) {
    throw err
  }

  console.log({result})
})

Read docs: Node SDK

npm install transloadify -g

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

# Save Encoding Instructions
echo '{
  ":original": {
    "robot": "/upload/handle"
  },
  "flac_encoded": {
    "use": ":original",
    "robot": "/audio/encode",
    "result": true,
    "preset": "flac",
    "ffmpeg_stack": "v3.3.3"
  },
  "exported": {
    "use": [
      "flac_encoded",
      ":original"
    ],
    "robot": "/s3/store",
    "credentials": "YOUR_AWS_CREDENTIALS",
    "url_prefix": "https://demos.transloadit.com/"
  }
}' > ./steps.json

transloadify \
  --input "./joakim_karud-rock_angel.mp3" \ 
  --output "./output.example" \
  --steps "./steps.json"

Read docs: Transloadify

// composer require transloadit/php-sdk
use transloadit\Transloadit;
$transloadit = new Transloadit([
  "key" => "YOUR_TRANSLOADIT_KEY",
  "secret" => "YOUR_TRANSLOADIT_SECRET",
]);

// Add files to upload
$files = [];
array_push($files, "./joakim_karud-rock_angel.mp3")

// Start the Assembly
$response = $transloadit->createAssembly([
  "files" => $files, 
  "params" => [
    "steps" => [
      ":original" => [
        "robot" => "/upload/handle",
      ],
      "flac_encoded" => [
        "use" => ":original",
        "robot" => "/audio/encode",
        "result" => true,
        "ffmpeg_stack" => "v3.3.3",
        "preset" => "flac",
      ],
      "exported" => [
        "use" => ["flac_encoded", ":original"],
        "robot" => "/s3/store",
        "credentials" => "YOUR_AWS_CREDENTIALS",
        "url_prefix" => "https://demos.transloadit.com/",
      ],
    ],
  ],
]);

Read docs: PHP SDK

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

# Set Encoding Instructions
:original = transloadit.step ":original", "/upload/handle",
)
flac_encoded = transloadit.step "flac_encoded", "/audio/encode",
  :use => ":original",
  :result => true,
  :ffmpeg_stack => "v3.3.3",
  :preset => "flac"
)
exported = transloadit.step "exported", "/s3/store",
  :use => ["flac_encoded",":original"],
  :credentials => "YOUR_AWS_CREDENTIALS",
  :url_prefix => "https://demos.transloadit.com/"
)

assembly = transloadit.assembly(
  :steps => [ :original, flac_encoded, exported ]
)

# Add files to upload
files = []
files.push("./joakim_karud-rock_angel.mp3")

# Start the Assembly
response = assembly.create! *files

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

if !response.error?
  # handle success
end

Read docs: Ruby SDK

# pip install pytransloadit
from transloadit import client

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

# Set Encoding Instructions
assembly.add_step(':original', {
  'robot': '/upload/handle'
})
assembly.add_step('flac_encoded', {
  'use': ':original',
  'robot': '/audio/encode',
  'result': true,
  'ffmpeg_stack': 'v3.3.3',
  'preset': 'flac'
})
assembly.add_step('exported', {
  'use': ['flac_encoded',':original'],
  'robot': '/s3/store',
  'credentials': 'YOUR_AWS_CREDENTIALS',
  'url_prefix': 'https://demos.transloadit.com/'
})
# Add files to upload
assembly.add_file(open('./joakim_karud-rock_angel.mp3', 'rb'))

# 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']

Read docs: Python SDK

// 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()

// Set Encoding Instructions
assembly.AddStep(":original", map[string]interface{}{
  "robot": "/upload/handle"
})
assembly.AddStep("flac_encoded", map[string]interface{}{
  "use": ":original",
  "robot": "/audio/encode",
  "result": true,
  "ffmpeg_stack": "v3.3.3",
  "preset": "flac"
})
assembly.AddStep("exported", map[string]interface{}{
  "use": ["flac_encoded",":original"],
  "robot": "/s3/store",
  "credentials": "YOUR_AWS_CREDENTIALS",
  "url_prefix": "https://demos.transloadit.com/"
})

// Add files to upload
assembly.AddFile("myfile_1", "./joakim_karud-rock_angel.mp3")

// 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)

Read docs: Go SDK

// compile 'com.transloadit.sdk:transloadit:0.1.5'
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();
    // Set Encoding Instructions
    Map<String Object> originalStepOptions = new HashMap();
    
    assembly.addStep(":original", "/upload/handle", originalStepOptions);
      
    Map<String Object> flacEncodedStepOptions = new HashMap();
    flacEncodedStepOptions.put("use", ":original");
    flacEncodedStepOptions.put("result", true);
    flacEncodedStepOptions.put("ffmpeg_stack", "v3.3.3");
    flacEncodedStepOptions.put("preset", "flac");
    assembly.addStep("flac_encoded", "/audio/encode", flacEncodedStepOptions);
      
    Map<String Object> exportedStepOptions = new HashMap();
    exportedStepOptions.put("use", new String[]{"flac_encoded", ":original"});
    exportedStepOptions.put("credentials", "YOUR_AWS_CREDENTIALS");
    exportedStepOptions.put("url_prefix", "https://demos.transloadit.com/");
    assembly.addStep("exported", "/s3/store", exportedStepOptions);
      
    // Add files to upload
    assembly.addFile(new File("./joakim_karud-rock_angel.mp3"));
    
    // Start the Assembly
    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
    }
  }
}

Read docs: Java SDK

So many ways to integrate

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

Bulk imports

Add one of our import Robots to acquire and transcode massive media libraries.
Handling uploads

We are the experts at reliably handling uploads. We wrote the protocol for it.
Front-end integration

We integrate with web browsers via our next-gen file uploader Uppy and SDKs for Android and iOS.
Back-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 in your account

Copy these instructions to a Template of your own
(you'll be able to make changes before actually saving)

Copy to Template

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We are a Swiss Army knife for your files

High-quality FLAC encoding

1. Handle uploads

2. Encode audio to FLAC

3. Export files to Amazon S3

Live Demo. See for yourself

Build this in your own language

So many ways to integrate

Bulk imports

Handling uploads

Front-end integration

Back-end integration

Pingbacks

Try it in your account

Get started for free

Other cool demos