Slate Cloud

Slate Cloud for Portive

slate-cloud adds images and attachments to Slate that are hosted in the cloud using Portive's cloud services for rich text editors.

Upload files using paste, drag & drop or standard <input type="file"> controls.

  • Shows upload progress bar
  • Allows rag to resize images
  • Images are resized on server for smaller file size delivery

This plugin works with Portive, the hosted back-end for rich text editors. It is a service which hosts files and provides other services for Rich Text Editors. It is a hosted back-end for these editors:

  • Slate: Slate is a customizable rich text editor for React. Slate cloud enables file and image uploading to the cloud with image resizing.
  • Plate - Official Cloud Service: Plate is a rich text editor plugin system for Slate & React. Plate Cloud enables image uploading to the cloud with image resizing.
  • Wysimark - Offical Cloud Service: Rich text editor that saves to the most popular rich text format Markdown. Supports GitHub Flavored Markdown extensions.

Start with our Getting Started Guide.


  • Asynchronous Uploads: While users are uploading an image or file, the user can still make edits in the Editor. A preview image or attachment block is displayed with a progress bar that shows the uload progress. This creates a friendly user experience for users.
  • Multi-File Uploads: Drag or drop multiple files, paste multiple files or select multiples files to start uploading them in parallel, each with their own progress bar
  • Server Side Image Resizing: When a user resizes the image in the browser, a resized image is generated on the server. By reducing the size of the image being delivered, images are delivered faster to the browser and reduces bandwidth usage.
  • Show Errors: If there is an error during upload, the progress bar turns red, says "Upload Failed" and a detailed description of what went wrong is put into the console.
  • High DPI/Retina Images: Users with a high DPI (dot per inch) device like most smart phones and tablets and some computers, we send a higher resolution image that matches the device.
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Image Features

  • Images uploaded to a scalable hosted service built on Amazon Web Services

  • Resizes images by dragging a resize bar

  • Images are resized on the server for faster downloads and reduced bandwidth

  • Uses HTML srcSet to deliver higher resolution images to displays with higher DPI (e.g. high resolution images will be delivered at 2x the resolution if possible)

  • Shows the width/height while dragging for precise resizing

  • While images are uploading, a live progress bar is shown

  • The progress bar is not part of Slate's edit history which means undo won't undo progress bar movement

  • Uses a CDN for fast performance

  • Specify default max width/height for initial view (e.g. you can default to a preview with a width of 320px or go full width)

  • Images are just a Slate Element that you define. Just add the <HostedImage> component inside it where you want the image to be shown. Because it's just a Slate element you can do all the following:

    • You can choose to display image as block or inline image.
    • You can choose to make it a void blocks (no editable inner content) or support editable content like an editable caption.
    • You have full control over how it displays (e.g. rounded edges, drop shadows, outlines)
  • Coming Soon:

    • Image presets. Specify preset sizes for thumbnail, preview and full if you desire
    • Image imports. When a user pastes the URL of an image, it automatically uploads the image to the editor.
    • Sharpening. Enable additional image processing like sharpening for low DPI displays. Sharpening is probably not required for high DPI displays.

Attachment Features

  • Default implementation shows attachment block with filename, file size (friendly format like 12KB) and the progress bar

  • Supports progress bar while uploading on custom attachments with a <ProgressBar> Component

  • Fully customizable to display aspects like size of file, original filename and who uploaded the attachment.

General Features

  • Has an async save method that ensures that all the images and attachments have finished uploading with an optional timeout. If the timeout is reached first, will return the document without the completed uploaded.

  • Uses a secret API key just for you that gives you control over who can upload, how much and for how long giving you secure control over uploading.

  • Coming Soon:

    • Tag file uploads, for example with a userId or a projectId
    • Limit file uploads based on tags and customize message when a limit is exceeded. For example, user johndoe can upload up to 1 GB and then he is shown a message and given a link to the upgrade page.