diff --git a/src/routes/_components/compose/ComposeMediaItem.html b/src/routes/_components/compose/ComposeMediaItem.html
index 4be38dab..bc8124ea 100644
--- a/src/routes/_components/compose/ComposeMediaItem.html
+++ b/src/routes/_components/compose/ComposeMediaItem.html
@@ -7,12 +7,11 @@
     aria-hidden="true"
   />
   <div class="compose-media-buttons">
-    <button class="compose-media-button compose-media-focal-button {focalHidden ? 'compose-media-hidden' : ''}"
-            aria-hidden={focalHidden}
-            aria-label="Change preview"
-            title="Change preview"
-            on:click="onSetFocalPoint()" >
-      <SvgIcon className="compose-media-button-svg" href="#fa-crosshairs" />
+    <button class="compose-media-button compose-media-focal-button"
+            aria-label="Edit"
+            title="Edit"
+            on:click="onEdit()" >
+      <SvgIcon className="compose-media-button-svg" href="#fa-pencil" />
     </button>
     <button class="compose-media-button compose-media-delete-button"
             aria-label="Delete"
@@ -27,6 +26,7 @@
            placeholder="Description"
            ref:textarea
            bind:value=rawText
+           maxlength="420"
     ></textarea>
     <label for="compose-media-input-{uuid}" class="sr-only">
       Describe for the visually impaired (image, video) or auditorily impaired (audio, video)
@@ -98,11 +98,6 @@
     height: 18px;
   }
 
-  .compose-media-hidden {
-    visibility: hidden;
-    pointer-events: none;
-  }
-
   .audio-preview {
     background: var(--audio-bg);
   }
@@ -130,10 +125,11 @@
   import { ONE_TRANSPARENT_PIXEL } from '../../_static/media'
   import { get } from '../../_utils/lodash-lite'
   import { coordsToPercent } from '../../_utils/coordsToPercent'
-  import { importMediaFocalPointDialog } from '../dialog/asyncDialogs'
+  import { importShowMediaEditDialog } from '../dialog/asyncDialogs'
   import { throttleTimer } from '../../_utils/throttleTimer'
 
   const updateMediaInStore = throttleTimer(scheduleIdleTask)
+  const resizeTextarea = process.browser && throttleTimer(requestAnimationFrame)
 
   export default {
     oncreate () {
@@ -165,8 +161,7 @@
           return 'center center'
         }
         return `${coordsToPercent(focusX)}% ${100 - coordsToPercent(focusY)}%`
-      },
-      focalHidden: ({ type }) => type !== 'image'
+      }
     },
     store: () => store,
     methods: {
@@ -178,6 +173,7 @@
           const text = get(media, [index, 'description'], '')
           if (rawText !== text) {
             this.set({ rawText: text })
+            resizeTextarea(() => autosize.update(this.refs.textarea))
           }
           const focusX = get(media, [index, 'focusX'], 0)
           const focusY = get(media, [index, 'focusY'], 0)
@@ -206,10 +202,10 @@
         const { realm, index } = this.get()
         deleteMedia(realm, index)
       },
-      async onSetFocalPoint () {
-        const { realm, index } = this.get()
-        const showMediaFocalPointDialog = await importMediaFocalPointDialog()
-        showMediaFocalPointDialog(realm, index)
+      async onEdit () {
+        const { realm, index, type } = this.get()
+        const showMediaEditDialog = await importShowMediaEditDialog()
+        showMediaEditDialog(realm, index, type)
       }
     },
     components: {
diff --git a/src/routes/_components/dialog/asyncDialogs.js b/src/routes/_components/dialog/asyncDialogs.js
index 78ee53d9..62e386eb 100644
--- a/src/routes/_components/dialog/asyncDialogs.js
+++ b/src/routes/_components/dialog/asyncDialogs.js
@@ -44,6 +44,6 @@ export const importShowReportDialog = () => import(
   /* webpackChunkName: 'showReportDialog' */ './creators/showReportDialog'
   ).then(getDefault)
 
-export const importMediaFocalPointDialog = () => import(
-  /* webpackChunkName: 'mediaFocalPointDialog' */ './creators/mediaFocalPointDialog'
+export const importShowMediaEditDialog = () => import(
+  /* webpackChunkName: 'showMediaEditDialog' */ './creators/showMediaEditDialog'
   ).then(getDefault)
diff --git a/src/routes/_components/dialog/components/MediaAltEditor.html b/src/routes/_components/dialog/components/MediaAltEditor.html
new file mode 100644
index 00000000..95a5e6b6
--- /dev/null
+++ b/src/routes/_components/dialog/components/MediaAltEditor.html
@@ -0,0 +1,104 @@
+<div class="media-alt-editor">
+  <textarea
+    id="the-media-alt-input-{realm}-{index}"
+    class="media-alt-input"
+    placeholder="Description"
+    ref:textarea
+    bind:value=rawText
+    maxlength="420"
+  ></textarea>
+  <label for="the-media-alt-input-{realm}-{index}" class="sr-only">
+    Describe for the visually impaired
+  </label>
+</div>
+<style>
+  .media-alt-editor {
+    display: flex;
+  }
+  .media-alt-input {
+    padding: 5px;
+    border: 1px solid var(--input-border);
+    min-height: 75px;
+    resize: none;
+    overflow: hidden;
+    word-wrap: break-word;
+    /* Text must be at least 16px or else iOS Safari zooms in */
+    font-size: 1.2em;
+    max-height: 70vh;
+  }
+
+  @media (max-height: 767px) {
+    .media-alt-input {
+      max-height: 40vh;
+      width: 100%;
+    }
+  }
+</style>
+<script>
+  import { requestPostAnimationFrame } from '../../../_utils/requestPostAnimationFrame'
+  import { mark, stop } from '../../../_utils/marks'
+  import { autosize } from '../../../_thirdparty/autosize/autosize'
+  import { observe } from 'svelte-extras'
+  import { throttleTimer } from '../../../_utils/throttleTimer'
+  import { get } from '../../../_utils/lodash-lite'
+  import { store } from '../../../_store/store'
+
+  const updateRawTextInStore = throttleTimer(requestPostAnimationFrame)
+
+  export default {
+    oncreate () {
+      this.setupAutosize()
+      this.setupSyncFromStore()
+      this.setupSyncToStore()
+    },
+    ondestroy () {
+      this.teardownAutosize()
+    },
+    store: () => store,
+    data: () => ({
+      rawText: ''
+    }),
+    methods: {
+      observe,
+      setupSyncFromStore () {
+        this.observe('media', media => {
+          media = media || []
+          const { index, rawText } = this.get()
+          const text = get(media, [index, 'description'], '')
+          if (rawText !== text) {
+            this.set({ rawText: text })
+          }
+        })
+      },
+      setupSyncToStore () {
+        this.observe('rawText', rawText => {
+          updateRawTextInStore(() => {
+            const { realm, index, media } = this.get()
+            if (media[index].description !== rawText) {
+              media[index].description = rawText
+              this.store.setComposeData(realm, { media })
+              this.store.save()
+            }
+            this.fire('resize')
+          })
+        }, { init: false })
+      },
+      setupAutosize () {
+        const textarea = this.refs.textarea
+        requestPostAnimationFrame(() => {
+          mark('autosize()')
+          autosize(textarea)
+          stop('autosize()')
+        })
+      },
+      teardownAutosize () {
+        mark('autosize.destroy()')
+        autosize.destroy(this.refs.textarea)
+        stop('autosize.destroy()')
+      },
+      measure () {
+        autosize.update(this.refs.textarea)
+      }
+    }
+  }
+</script>
diff --git a/src/routes/_components/dialog/components/MediaEditDialog.html b/src/routes/_components/dialog/components/MediaEditDialog.html
new file mode 100644
index 00000000..5466f02b
--- /dev/null
+++ b/src/routes/_components/dialog/components/MediaEditDialog.html
@@ -0,0 +1,100 @@
+<ModalDialog
+  {id}
+  {label}
+  {title}
+  background="var(--main-bg)"
+  className="media-edit-dialog"
+  on:show="measure()"
+>
+  <div class="media-edit-dialog-container">
+    <div class="media-edit-header-and-item">
+      <h2>Description</h2>
+      <MediaAltEditor
+        {realm}
+        {index}
+        {media}
+        on:resize="measure()"
+        ref:altEditor
+      />
+    </div>
+    {#if type === 'image'}
+      <div class="media-edit-header-and-item">
+        <h2>Preview (focal point)</h2>
+        <MediaFocalPointEditor
+          {realm}
+          {index}
+          {media}
+          ref:focalPointEditor
+        />
+      </div>
+    {/if}
+  </div>
+</ModalDialog>
+<style>
+  :global(.media-edit-dialog) {
+    max-width: calc(100%);
+  }
+
+  .media-edit-dialog-container {
+    display: flex;
+    flex-direction: row;
+    max-height: calc(100% - 44px); /* 44px X button height */
+    height: 100%;
+    width: 100%;
+  }
+
+  .media-edit-header-and-item {
+    padding: 10px;
+  }
+
+  .media-edit-header-and-item h2 {
+    margin-bottom: 10px;
+  }
+
+  @media (max-width: 767px) {
+    .media-edit-dialog-container {
+      flex-direction: column;
+      overflow: auto;
+    }
+
+    .media-edit-dialog-container {
+      max-height: calc(100% - 25px); /* 25px X button height */
+    }
+  }
+
+</style>
+<script>
+  import ModalDialog from './ModalDialog.html'
+  import { show } from '../helpers/showDialog'
+  import { close } from '../helpers/closeDialog'
+  import { oncreate } from '../helpers/onCreateDialog'
+  import MediaFocalPointEditor from '../components/MediaFocalPointEditor.html'
+  import MediaAltEditor from '../components/MediaAltEditor.html'
+  import { store } from '../../../_store/store'
+  import { get } from '../../../_utils/lodash-lite'
+
+  export default {
+    oncreate,
+    components: {
+      ModalDialog,
+      MediaFocalPointEditor,
+      MediaAltEditor
+    },
+    methods: {
+      show,
+      close,
+      measure () {
+        this.refs.altEditor.measure()
+        if (this.refs.focalPointEditor) {
+          this.refs.focalPointEditor.measure()
+        }
+      }
+    },
+    store: () => store,
+    computed: {
+      media: ({ $currentInstance, $composeData, realm }) => (
+        get($composeData, [$currentInstance, realm, 'media'])
+      )
+    }
+  }
+</script>
diff --git a/src/routes/_components/dialog/components/MediaFocalPointDialog.html b/src/routes/_components/dialog/components/MediaFocalPointEditor.html
similarity index 72%
rename from src/routes/_components/dialog/components/MediaFocalPointDialog.html
rename to src/routes/_components/dialog/components/MediaFocalPointEditor.html
index 1ad71f31..7b43fcc3 100644
--- a/src/routes/_components/dialog/components/MediaFocalPointDialog.html
+++ b/src/routes/_components/dialog/components/MediaFocalPointEditor.html
@@ -1,86 +1,71 @@
-<ModalDialog
-  {id}
-  {label}
-  {title}
-  background="var(--main-bg)"
-  className="media-focal-point-dialog"
-  on:show="measure()"
+<form class="media-focal-point-container"
+      aria-label="Enter the focal point (X, Y) for this media"
+      on:resize="measure()"
 >
-  <form class="media-focal-point-container"
-        aria-label="Enter the focal point (X, Y) for this media"
-        on:resize="measure()"
-  >
-    <div class="media-focal-point-image-container" ref:container>
-      <img
-        {intrinsicsize}
-        class="media-focal-point-image"
-        src={previewSrc}
-        alt={shortName}
-        on:load="onImageLoad()"
-      />
-      <div class="media-focal-point-backdrop"></div>
-      <div class="media-draggable-area"
-           style={draggableAreaStyle}
+  <div class="media-focal-point-image-container" ref:container>
+    <img
+      {intrinsicsize}
+      class="media-focal-point-image"
+      src={previewSrc}
+      alt={shortName}
+      on:load="onImageLoad()"
+    />
+    <div class="media-focal-point-backdrop"></div>
+    <div class="media-draggable-area"
+         style={draggableAreaStyle}
+    >
+      <!-- 52px == 32px icon width + 10px padding -->
+      <Draggable
+        draggableClass="media-draggable-area-inner"
+        indicatorClass="media-focal-point-indicator {imageLoaded ? '': 'hidden'} {dragging ? 'dragging' : ''}"
+        indicatorWidth={52}
+        indicatorHeight={52}
+        x={indicatorX}
+        y={indicatorY}
+        on:dragStart="onDragStart()"
+        on:dragEnd="onDragEnd()"
+        on:change="onDraggableChange(event)"
       >
-        <!-- 52px == 32px icon width + 10px padding -->
-        <Draggable
-          draggableClass="media-draggable-area-inner"
-          indicatorClass="media-focal-point-indicator {imageLoaded ? '': 'hidden'} {dragging ? 'dragging' : ''}"
-          indicatorWidth={52}
-          indicatorHeight={52}
-          x={indicatorX}
-          y={indicatorY}
-          on:dragStart="onDragStart()"
-          on:dragEnd="onDragEnd()"
-          on:change="onDraggableChange(event)"
-        >
-          <SvgIcon
-            className="media-focal-point-indicator-svg"
-            href="#fa-crosshairs"
-          />
-        </Draggable>
-      </div>
+        <SvgIcon
+          className="media-focal-point-indicator-svg"
+          href="#fa-crosshairs"
+        />
+      </Draggable>
     </div>
-    <div class="media-focal-point-inputs">
-      <div class="media-focal-point-input-pair">
-        <label for="media-focal-point-x-input-{realm}">
-          X coordinate
-        </label>
-        <input type="number"
-               step="0.01"
-               min="-1"
-               max="1"
-               inputmode="decimal"
-               placeholder="0"
-               id="media-focal-point-x-input-{realm}"
-               bind:value="rawFocusX"
-         />
-      </div>
-      <div class="media-focal-point-input-pair">
-        <label for="media-focal-point-y-input-{realm}">
-          Y coordinate
-        </label>
-        <input type="number"
-               step="0.01"
-               min="-1"
-               max="1"
-               inputmode="decimal"
-               placeholder="0"
-               id="media-focal-point-y-input-{realm}"
-               bind:value="rawFocusY"
+  </div>
+  <div class="media-focal-point-inputs">
+    <div class="media-focal-point-input-pair">
+      <label for="media-focal-point-x-input-{realm}">
+        X coordinate
+      </label>
+      <input type="number"
+             step="0.01"
+             min="-1"
+             max="1"
+             inputmode="decimal"
+             placeholder="0"
+             id="media-focal-point-x-input-{realm}"
+             bind:value="rawFocusX"
       />
-      </div>
     </div>
-  </form>
-</ModalDialog>
+    <div class="media-focal-point-input-pair">
+      <label for="media-focal-point-y-input-{realm}">
+        Y coordinate
+      </label>
+      <input type="number"
+             step="0.01"
+             min="-1"
+             max="1"
+             inputmode="decimal"
+             placeholder="0"
+             id="media-focal-point-y-input-{realm}"
+             bind:value="rawFocusY"
+      />
+    </div>
+  </div>
+</form>
 <style>
-  :global(.media-focal-point-dialog) {
-    max-width: calc(100%);
-  }
   .media-focal-point-container {
-    height: calc(100% - 44px); /* 44px X button height */
-    width: calc(100vw - 40px);
-    padding-top: 10px;
     display: flex;
     flex-direction: column;
   }
@@ -120,7 +105,7 @@
 
   .media-focal-point-inputs {
     display: flex;
-    padding: 20px 40px;
+    padding: 10px;
     justify-content: space-around;
     width: auto;
   }
@@ -130,6 +115,10 @@
     align-items: center;
   }
 
+  .media-focal-point-input-pair:first-child {
+    margin-right: 10px;
+  }
+
   .media-focal-point-input-pair input {
     margin-left: 20px;
   }
@@ -180,10 +169,6 @@
   }
 </style>
 <script>
-  import ModalDialog from './ModalDialog.html'
-  import { show } from '../helpers/showDialog'
-  import { close } from '../helpers/closeDialog'
-  import { oncreate as onCreateDialog } from '../helpers/onCreateDialog'
   import { store } from '../../../_store/store'
   import { get } from '../../../_utils/lodash-lite'
   import { observe } from 'svelte-extras'
@@ -207,12 +192,10 @@
 
   export default {
     oncreate () {
-      onCreateDialog.call(this)
       this.setupSyncFromStore()
       this.setupSyncToStore()
     },
     components: {
-      ModalDialog,
       SvgIcon,
       Draggable
     },
@@ -226,9 +209,6 @@
     }),
     store: () => store,
     computed: {
-      media: ({ $currentInstance, $composeData, realm }) => (
-        get($composeData, [$currentInstance, realm, 'media'])
-      ),
       mediaItem: ({ media, index }) => get(media, [index]),
       focusX: ({ mediaItem }) => get(mediaItem, ['focusX'], 0),
       focusY: ({ mediaItem }) => get(mediaItem, ['focusY'], 0),
@@ -267,8 +247,6 @@
     },
     methods: {
       observe,
-      show,
-      close,
       setupSyncFromStore () {
         this.observe('mediaItem', mediaItem => {
           const { rawFocusX, rawFocusY } = this.get()
diff --git a/src/routes/_components/dialog/creators/mediaFocalPointDialog.js b/src/routes/_components/dialog/creators/mediaFocalPointDialog.js
deleted file mode 100644
index 71a4a9c9..00000000
--- a/src/routes/_components/dialog/creators/mediaFocalPointDialog.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import MediaFocalPointDialog from '../components/MediaFocalPointDialog.html'
-import { showDialog } from './showDialog'
-
-export default function showMediaFocalPointDialog (realm, index) {
-  return showDialog(MediaFocalPointDialog, {
-    label: 'Change preview dialog',
-    title: 'Change preview (focal point)',
-    realm,
-    index
-  })
-}
diff --git a/src/routes/_components/dialog/creators/showMediaEditDialog.js b/src/routes/_components/dialog/creators/showMediaEditDialog.js
new file mode 100644
index 00000000..7eb8154c
--- /dev/null
+++ b/src/routes/_components/dialog/creators/showMediaEditDialog.js
@@ -0,0 +1,12 @@
+import MediaFocalPointDialog from '../components/MediaEditDialog.html'
+import { showDialog } from './showDialog'
+
+export default function showMediaEditDialog (realm, index, type) {
+  return showDialog(MediaFocalPointDialog, {
+    label: 'Edit media',
+    title: 'Edit media',
+    realm,
+    index,
+    type
+  })
+}