AWS Lambdalambda is an event-driven compute service which runs your code (Lambda functions) in response to events, such as changes to data in an Amazon S3 bucket. The CloudConvert API can be used to automatically convert all files, added to a specific S3 bucket. Typical use cases are converting all office documents to PDF, creating thumbnails or encoding videos.

We have created a GitHub repository with an example Lambda function. To get it running, follow these instructions:

  • Download / Fork the repository
  • Run npm install
  • Adjust convert.js according to your needs:
    • Set CLUDCONVERT_API_KEY to your personal API key.
    • Set AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY for downloading and uploading from/to your S3 bucket.
    • Adjust the conversion paramaters, such as outputformat according to your need. All possible options can be identified using the API Console.
  • Create a ZIP file which contains convert.js and the node_modules folder.
  • In the AWS Console create a new Lambda function. Select Blank Function blueprint.
  • Select S3 trigger and your bucket. Set Event Type to PUT. Adjust Prefix and Suffix to trigger for specific files only.
  • Choose a name for your Lambda function and use Node.js 4.3 as Runtime. Upload your previously created ZIP file as Lambda function. The Handler name needs to be convert.handler. The lambda function does not need any specific permissions: you can create a new empty role.
  • A timeout value of 10 seconds should be sufficient. Please note that the lambda function only triggers the actual conversion and terminates as soon as the conversion was started. Therefore the timeout does not affect the time needed for the actual conversion.
  • Done! You can test your Lambda function by adding a new file to your S3 bucket.

zapierWe are happy to announce that CloudConvert is now fully integrated with Zapier! Using Zapier you can connect CloudConvert to 500+ other Apps like Evernote, Basecamp, Gmail, Trello, Slack and so many others. Below you can find some ideas for possible “Zaps”.

We are looking forward to see your workflows and use cases for Zapier!

We did a lot of improvements on our API regarding input file uploads. Previously you had to embed the file together with all your parameters in a single multipart/form-related POST request. Although such multipart requests are widely used, implementing them is often pretty inconvenient. Therefore we decided to provide an alternative way of uploading the input files. In short you can use now a simple PUT requests to a designated upload url and send the actual file content as body of your request. Checkout our updated API documentation for details.

Using a designated upload url has another advantage: If your input files are provided by your users, you can now let them upload their files directly to CloudConvert. This avoids the time consuming process of uploading the files to your server first and afterwards sending them to us. We have updated our PHP wrapper with an example on how to use this:

require __DIR__ . '/vendor/autoload.php';
use \CloudConvert\Api;
$api = new Api("your_api_key");

$process = $api->createProcess([
 'inputformat' => 'png',
 'outputformat' => 'jpg',

 'input' => 'upload',
 'outputformat' => 'jpg',
 'converteroptions' => [
   'quality' => 75,
 'callback' => 'http://_INSERT_PUBLIC_URL_TO_/callback.php'
<form action="<?=$process->upload->url?>" method="POST" enctype="multipart/form-data">
 <input type="file" name="file">
 <input type="submit">

Don’t worry – as always, our API stays full backward compatible. If you are using the old method of uploading files, nothing needs to be changed. Our suggestion of using the new method only applies to new implementations.

We just pushed the official Python API Wrapper to Github. Using it you can do cool stuff with just a few lines of code:

import cloudconvert

api = cloudconvert.Api('your_api_key')

process = api.convert({
    'inputformat': 'html',
    'outputformat': 'pdf',
    'input': 'upload',
    'file': open('input.html', 'rb')

As always, you can create ready to use code snippets using the API console.

When creating PDF files from DOCX or PPTX files CloudConvert can now dynamically change the content. This feature makes it more convenient to create invoices or mass letters dynamically. Technically you set up a DOCX template with placeholders (for example ${name}). While converting the DOCX file to PDF CloudConvert can replace these placeholders with custom values. This even works for tables with a variable amount of rows as the following example shows.


The shown PDF was created using the DOCX template file and these few lines of PHP code:

    "input" => "upload",
    "inputformat" => "docx",
    "outputformat" => "pdf",
    "converteroptions" => [
       "templating" => [
          "name" => "John Smith",
          "address" => "Smithstreet 1",
          "city" => "Smithtown",
          "zip" => "10101",
          "country" => "US",
          "comment" => "Thanks for your business!",
          "date" => "2015-11-24",
          "total" => "160",
          "items" => [
            ["description" => "Nameless product", "price" => "10", "quantity" => "2", "total" => "20"],
            ["description" => "Other product", "price" => "100", "quantity" => "1", "total" => "100"],
            ["description" => "Stuff", "price" => "2", "quantity" => "20", "total" => "40"],
    "file" => fopen('template.docx', 'r'),

Checkout the full Syntax for the placeholders of the new templating feature.

We think this feature is a great step to make CloudConvert even more powerful and we hope you like it!

The syntax is highly inspired by Mustache. The template is created in Microsoft Word/PowerPoint or any equivalent that saves to DOCX/PPTX. Also checkout this example of using the templating feature.


A typical DOCX template:

Hello {name} !

Given the following value for the templating JSON dictionary:


Will produce:

Hello Edgar !

Tag types

Like Mustache, it has the loopopening {#} and loopclosing {/} brackets

Loop syntax

The following template:

    {name}, {price} €

Given the following JSON dictionary:

         {name:"Mac OSX",price:200},

will result in :

Windows, 100 €
Mac OSX, 200 €
Ubuntu, 0 €

The loop behaves in the following way:

  • If the value is an array, it will loop over all the elements of that array.
  • If the value is a boolean, it will loop once if the value is true, keeping the same scope, and not loop at all if the value is false

Note: Because the loops work also with boolean values, you can also use them for conditions.

Raw XML syntax

Sometimes, you would like to insert your custom XML (a complex table, a formula, …)

With the RawXML syntax the variable is interpreted as XML and replaced in the formula


with this data:

{rawXml:'<w:p><w:pPr><w:rPr><w:color w:val="FF0000"/></w:rPr></w:pPr><w:r><w:rPr><w:color w:val="FF0000"/></w:rPr><w:t>My custom</w:t></w:r><w:r><w:rPr><w:color w:val="00FF00"/></w:rPr><w:t>XML</w:t></w:r></w:p>'}

This will loop over the first parent tag

Inverted Selections

An inverted section begins with a caret (hat) and ends with a slash. That is {^person} begins a “person” inverted section while {/person} ends it.

While sections can be used to render text one or more times based on the value of the key, inverted sections may render text once based on the inverse value of the key. That is, they will be rendered if the key doesn’t exist, is false, or is an empty list.


  No repos 🙁

Value for the templating JSON dictionary:

  "repo": []


No repos 🙁

We think in times of cloud computing you cannot categorize payments in fixed packages. We do not want to force our customers in buying or subscribing for 1000, 5000, or 10000 conversion minutes. From now on our customers can completely customize their prepaid packages and subscriptions and scale them according to their needs. If you want to subscribe for monthly 2222 conversion minutes, you can do so! Checkout our pricing site with the new sliders for your personal customization.

We are happy to announce another awesome CloudConvert enhancement! CloudConvert Folder Monitoring is a powerful feature to make your workflow even more efficient. You can set up special folders in your Google Drive or Dropbox account as Triggers. Every time you add a file to this folder it is automatically converted to a chosen output format with your customized options.

There are uncountable cool use cases for this feature:

  • Convert any added file type in a folder to PDF
  • Automatically encode added videos with a specific codec and settings
  • Automatically resize added JPGs to a fixed size
  • Automatically encrypt added PDFs with a password

Folder Monitoring is available as Beta feature for our paying users (prepaid package or subscription), starting today!

There is a great simplification for our long-term customers, especially our API users: By buying a prepaid package, you can now select the new “Auto Rebuy” option. This option makes sure the package is automatically rebuyed, if your quota of conversion minutes is used up to 95%.

If you have set up this once, you won’t need to worry any more about your account is running out of quota and your API implementations might stop working.  We hope you like it!