diff --git a/VoidCat/Controllers/NostrController.cs b/VoidCat/Controllers/NostrController.cs
index 2385c11..a4d5164 100644
--- a/VoidCat/Controllers/NostrController.cs
+++ b/VoidCat/Controllers/NostrController.cs
@@ -86,17 +86,24 @@ public class NostrController : BaseDownloadController
             await _fileMetadata.Add(vf);
             await _userUploads.AddFile(nostrUser.Id, vf.Id);
 
+            List<List<string>> tags = new()
+            {
+                new() {"url", new Uri(_settings.SiteUrl, $"/nostr/{vf.OriginalDigest}{Path.GetExtension(vf.Name)}").ToString()},
+                new() {"ox", vf.OriginalDigest ?? "", _settings.SiteUrl.ToString()},
+                new() {"x", vf.Digest ?? ""},
+                new() {"m", vf.MimeType}
+            };
+
+            if (!string.IsNullOrEmpty(vf.MediaDimensions))
+            {
+                tags.Add(new() {"dim", vf.MediaDimensions});
+            }
+
             var ret = new Nip96UploadResult
             {
                 FileHeader = new()
                 {
-                    Tags = new()
-                    {
-                        new() {"url", new Uri(_settings.SiteUrl, $"/nostr/{vf.OriginalDigest}{Path.GetExtension(vf.Name)}").ToString()},
-                        new() {"ox", vf.OriginalDigest ?? "", _settings.SiteUrl.ToString()},
-                        new() {"x", vf.Digest ?? ""},
-                        new() {"m", vf.MimeType}
-                    }
+                    Tags = tags
                 }
             };
 
diff --git a/VoidCat/Model/Extensions.cs b/VoidCat/Model/Extensions.cs
index 4064d91..9e092ab 100644
--- a/VoidCat/Model/Extensions.cs
+++ b/VoidCat/Model/Extensions.cs
@@ -359,7 +359,8 @@ public static class Extensions
             EditSecret = withEditSecret ? f.EditSecret : null,
             Storage = f.Storage,
             EncryptionParams = f.EncryptionParams,
-            MagnetLink = f.MagnetLink
+            MagnetLink = f.MagnetLink,
+            MediaDimensions = f.MediaDimensions
         };
     }
 
diff --git a/VoidCat/Model/VoidFile.cs b/VoidCat/Model/VoidFile.cs
index 3b4b456..8627161 100644
--- a/VoidCat/Model/VoidFile.cs
+++ b/VoidCat/Model/VoidFile.cs
@@ -32,4 +32,5 @@ public class VoidFileMeta
     public string Storage { get; init; } = "local-disk";
     public string? EncryptionParams { get; init; }
     public string? MagnetLink { get; init; }
+    public string? MediaDimensions { get; init; }
 }
\ No newline at end of file
diff --git a/VoidCat/Services/Files/CompressContent.cs b/VoidCat/Services/Files/CompressContent.cs
index 00c0f65..2a51838 100644
--- a/VoidCat/Services/Files/CompressContent.cs
+++ b/VoidCat/Services/Files/CompressContent.cs
@@ -40,6 +40,7 @@ public class CompressContent
                 }
             }
 
+            var ffProbe = await TryProbe(input, cts);
             var probe = isImage ? await ImageFile.FromFileAsync(input) : default;
             var ffmpeg = FFMpegArguments
                 .FromFileInput(input)
@@ -73,7 +74,9 @@ public class CompressContent
             var result = await ffmpeg.ProcessAsynchronously();
             return new(result, output)
             {
-                MimeType = outMime
+                MimeType = outMime,
+                Width = ffProbe?.PrimaryVideoStream?.Width,
+                Height = ffProbe?.PrimaryVideoStream?.Height,
             };
         }
         catch (Exception ex)
@@ -84,8 +87,24 @@ public class CompressContent
         return new(false, output);
     }
 
+    private async Task<IMediaAnalysis?> TryProbe(string path, CancellationToken cts)
+    {
+        try
+        {
+            return await FFProbe.AnalyseAsync(path, cancellationToken: cts);
+        }
+        catch
+        {
+            // ignored
+        }
+
+        return default;
+    }
+
     public record CompressResult(bool Success, string OutPath)
     {
         public string? MimeType { get; init; }
+        public int? Width { get; init; }
+        public int? Height { get; init; }
     }
 }
diff --git a/VoidCat/Services/Files/LocalDiskFileStorage.cs b/VoidCat/Services/Files/LocalDiskFileStorage.cs
index da45f76..d6e1006 100644
--- a/VoidCat/Services/Files/LocalDiskFileStorage.cs
+++ b/VoidCat/Services/Files/LocalDiskFileStorage.cs
@@ -73,7 +73,8 @@ public class LocalDiskFileStore : StreamFileStore, IFileStore
                     Size = (ulong)fInfo.Length,
                     Digest = hash.ToHex(),
                     MimeType = res.MimeType ?? vf.MimeType,
-                    OriginalDigest = originalHash.ToHex()
+                    OriginalDigest = originalHash.ToHex(),
+                    MediaDimensions = res is {Width: not null, Height: not null} ? $"{res.Width.Value}x{res.Height.Value}" : null
                 };
             }
             else