diff --git a/src/modules/fedimbed.js b/src/modules/fedimbed.js
index d056f8a..e5dba2f 100644
--- a/src/modules/fedimbed.js
+++ b/src/modules/fedimbed.js
@@ -249,6 +249,13 @@ async function signedFetch(url, options) {
   return await fetch(url, options);
 }
 
+function trimAltText(str) {
+  if (str == null) return null;
+  else if (str.length <= 0) return null;
+  else if (str.length > 1024) return str.substring(0, 1023) + "\u2026";
+  else return str;
+}
+
 // https://tenor.com/view/12766761978490409957
 // https://github.com/bluesky-social/atproto/blob/main/packages/api/src/rich-text/unicode.ts
 const encoder = new TextEncoder();
@@ -396,7 +403,7 @@ async function blueskyQuoteEmbed(quote) {
         images.push(
           ...embed.images.map((image) => ({
             media: {url: image.fullsize},
-            description: image.alt.length > 0 ? image.alt : null,
+            description: trimAltText(image.alt),
           }))
         );
         break;
@@ -406,7 +413,7 @@ async function blueskyQuoteEmbed(quote) {
         const domain = lookup.service.find((service) => service.id === "#atproto_pds").serviceEndpoint;
         const videoUrl = `${domain}/xrpc/com.atproto.sync.getBlob?did=${quote.author.did}&cid=${embed.cid}`;
 
-        videos.push({media: {url: videoUrl}, description: embed.alt?.length > 0 ? embed.alt : null});
+        videos.push({media: {url: videoUrl}, description: trimAltText(embed.alt)});
         break;
       }
       case "app.bsky.embed.recordWithMedia#view": {
@@ -414,7 +421,7 @@ async function blueskyQuoteEmbed(quote) {
           images.push(
             ...embed.media.images.map((image) => ({
               media: {url: image.fullsize},
-              description: image.alt.length > 0 ? image.alt : null,
+              description: trimAltText(image.alt),
             }))
           );
         } else if (embed.media.$type === "app.bsky.embed.video#view") {
@@ -422,7 +429,7 @@ async function blueskyQuoteEmbed(quote) {
           const domain = lookup.service.find((service) => service.id === "#atproto_pds").serviceEndpoint;
           const videoUrl = `${domain}/xrpc/com.atproto.sync.getBlob?did=${quote.author.did}&cid=${embed.media.cid}`;
 
-          videos.push({media: {url: videoUrl}, description: embed.alt?.length > 0 ? embed.alt : null});
+          videos.push({media: {url: videoUrl}, description: trimAltText(embed.alt)});
         }
         break;
       }
@@ -542,7 +549,7 @@ async function bluesky(msg, url, spoiler = false) {
         images.push(
           ...post.embed.images.map((image) => ({
             media: {url: image.fullsize},
-            description: image.alt.length > 0 ? image.alt : null,
+            description: trimAltText(image.alt),
           }))
         );
         break;
@@ -552,7 +559,7 @@ async function bluesky(msg, url, spoiler = false) {
         const domain = lookup.service.find((service) => service.id === "#atproto_pds").serviceEndpoint;
         const videoUrl = `${domain}/xrpc/com.atproto.sync.getBlob?did=${post.author.did}&cid=${post.embed.cid}`;
 
-        videos.push({media: {url: videoUrl}, description: post.embed.alt?.length > 0 ? post.embed.alt : null});
+        videos.push({media: {url: videoUrl}, description: trimAltText(post.embed.alt)});
         break;
       }
       case "app.bsky.embed.record#view": {
@@ -574,7 +581,7 @@ async function bluesky(msg, url, spoiler = false) {
           images.push(
             ...post.embed.media.images.map((image) => ({
               media: {url: image.fullsize},
-              description: image.alt.length > 0 ? image.alt : null,
+              description: trimAltText(image.alt),
             }))
           );
         } else if (post.embed.media.$type === "app.bsky.embed.video#view") {
@@ -582,7 +589,7 @@ async function bluesky(msg, url, spoiler = false) {
           const domain = lookup.service.find((service) => service.id === "#atproto_pds").serviceEndpoint;
           const videoUrl = `${domain}/xrpc/com.atproto.sync.getBlob?did=${post.author.did}&cid=${post.embed.media.cid}`;
 
-          videos.push({media: {url: videoUrl}, description: post.embed.alt?.length > 0 ? post.embed.alt : null});
+          videos.push({media: {url: videoUrl}, description: trimAltText(post.embed.alt)});
         } else if (post.embed.media.$type === "app.bsky.embed.external#view") {
           if (post.embed.media.external.uri.includes("tenor.com")) {
             const url = new URL(post.embed.media.external.uri);
@@ -1071,21 +1078,21 @@ async function processUrl(msg, url, spoiler = false, command = false, inQuote =
       for (const attachment of attachments) {
         const type = attachment.type?.toLowerCase();
 
-        const attDesc = attachment.description ?? attachment.comment;
+        const attDesc = trimAltText(attachment.description ?? attachment.comment);
         if (type.startsWith("image")) {
           images.push({
             media: {url: attachment.url},
-            description: attDesc?.length > 0 ? attDesc : null,
+            description: attDesc,
           });
         } else if (type.startsWith("video")) {
           videos.push({
             media: {url: attachment.url},
-            description: attDesc?.length > 0 ? attDesc : null,
+            description: attDesc,
           });
         } else if (type.startsWith("audio")) {
           audios.push({
             url: attachment.url,
-            description: attDesc?.length > 0 ? attDesc : null,
+            description: attDesc,
           });
         }
       }
@@ -1197,21 +1204,21 @@ async function processUrl(msg, url, spoiler = false, command = false, inQuote =
             }
           }
 
-          const attDesc = attachment.name ?? attachment.description ?? attachment.comment;
+          const attDesc = trimAltText(attachment.name ?? attachment.description ?? attachment.comment);
           if (type.startsWith("image") || mediaType.startsWith("image")) {
             images.push({
               media: {url: attUrl},
-              description: attDesc?.length > 0 ? attDesc : null,
+              description: attDesc,
             });
           } else if (type.startsWith("video") || mediaType.startsWith("video")) {
             videos.push({
               media: {url: attUrl},
-              description: attDesc?.length > 0 ? attDesc : null,
+              description: attDesc,
             });
           } else if (type.startsWith("audio") || mediaType.startsWith("audio")) {
             audios.push({
               url: attUrl,
-              description: attDesc?.length > 0 ? attDesc : null,
+              description: attDesc,
             });
           }
         } else {
@@ -1481,7 +1488,6 @@ async function processUrl(msg, url, spoiler = false, command = false, inQuote =
     });
   }
   for (const video of videos) {
-    if (video.description?.length === 0) video.description = null;
     container.components.push({
       type: 12,
       items: [video],