Crop a picture to Twitter cover dimensions

🤖/image/resize allows you to quickly generate different sizes for uploaded images. In this demo, it resizes an uploaded image file and converts it to perfectly match the size needed for a Twitter cover photo.

In this post we used the fillcrop resize strategy, however there are many more which 🤖/image/resize can utilize so go ahead and give them a shot.

To find the current dimensions of a Twitter cover photo we used our own Peter Assentorp's excellent socialsizes.io. Make sure to check it out for other useful dimensions for your social media accounts!

Step 1:

Handle uploads

We can handle uploads of your users directly.Learn more

chameleon.jpg

Image – 3.3 MB

4799 × 3199

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

/upload/handle

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

Step 2:

Convert, resize, or watermark images

We can resize, crop, and (auto-)rotate images, or apply watermarks and other effects, and much more.Learn more

chameleon.jpg

Image – 234 KB

1500 × 500

"crop_thumbed": {
  "use": ":original",
  "robot": "/image/resize",
  "result": true,
  "height": 500,
  "resize_strategy": "fillcrop",
  "width": 1500
}

/image/resize

This bot resizes, crops, changes colorization, rotation, and applies text and watermarks to images

Step 3:

Export files to Amazon S3

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

:original

https://demos.transloadit.com/6a/23e644b5bc4ad792ab3824b9c2bdf1/chameleon.jpg

crop_thumbed

https://demos.transloadit.com/a8/2e8d4e8eb647df8ced6d4729badc20/chameleon.jpg

"exported": {
  "use": [
    "crop_thumbed",
    ":original"
  ],
  "robot": "/s3/store",
  "credentials": "demo_s3_credentials",
  "url_prefix": "https://demos.transloadit.com/"
}

/s3/store

This bot exports encoding results to Amazon S3

Live Demo. See for yourself

Loading Uppy demo…

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

<!-- This pulls Uppy from our CDN -->
<!-- For smaller self-hosted bundles, install Uppy and plugins manually: -->
<!-- npm i --save @uppy/core @uppy/dashboard @uppy/remote-sources @uppy/transloadit ... -->
<link
  href="https://releases.transloadit.com/uppy/v3.10.0/uppy.min.css"
  rel="stylesheet"
/>
<button id="browse">Select Files</button>
<script type="module">
  import {
    Uppy,
    Dashboard,
    ImageEditor,
    RemoteSources,
    Transloadit,
  } from 'https://releases.transloadit.com/uppy/v3.10.0/uppy.min.mjs'
  const uppy = new Uppy()
    .use(Transloadit, {
      waitForEncoding: true,
      alwaysRunAssembly: true,
      assemblyOptions: {
        params: {
          // 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',
            },
            crop_thumbed: {
              use: ':original',
              robot: '/image/resize',
              result: true,
              height: 500,
              resize_strategy: 'fillcrop',
              width: 1500,
            },
            exported: {
              use: ['crop_thumbed', ':original'],
              robot: '/s3/store',
              credentials: 'demo_s3_credentials',
              url_prefix: 'https://demos.transloadit.com/',
            },
          },
        },
      },
    })
    .use(Dashboard, { trigger: '#browse' })
    .use(ImageEditor, { target: Dashboard })
    .use(RemoteSources, {
      companionUrl: 'https://api2.transloadit.com/companion',
    })
    .on('complete', ({ transloadit }) => {
      // Due to `waitForEncoding:true` this is fired after encoding is done.
      // Alternatively, set `waitForEncoding` to `false` and provide a `notify_url`
      console.log(transloadit) // Array of Assembly Statuses
      for (const assembly of transloadit) {
        console.log(assembly.results) // Array of all encoding results
      }
    })
    .on('error', (error) => {
      console.error(error)
    })
</script>

Read docs: Browsers

So many ways to integrate

Transloadit is a service for companies with developers. And there are many ways developers can put Transloadit to good use inside your company to automate media processing.