diff --git a/actions/publishToPublication.ts b/actions/publishToPublication.ts
index db3c789e..d5fa9ce0 100644
--- a/actions/publishToPublication.ts
+++ b/actions/publishToPublication.ts
@@ -89,6 +89,8 @@ export async function publishToPublication({
   entitiesToDelete?: string[];
   publishedAt?: string;
 }): Promise<PublishResult> {
+  // Normalize tags to lowercase for consistent storage and querying
+  const normalizedTags = tags?.map((tag) => tag.toLowerCase());
   let identity = await getIdentityData();
   if (!identity || !identity.atp_did) {
     return {
@@ -241,7 +243,7 @@ export async function publishToPublication({
       publishedAt:
         publishedAt || existingRecord.publishedAt || new Date().toISOString(),
       ...(description && { description }),
-      ...(tags !== undefined && { tags }),
+      ...(normalizedTags !== undefined && { tags: normalizedTags }),
       ...(coverImageBlob && { coverImage: coverImageBlob }),
       // Include theme for standalone documents (not for publication documents)
       ...(!publication_uri && theme && { theme }),
@@ -259,7 +261,7 @@ export async function publishToPublication({
       ...(theme && { theme }),
       title: title || "Untitled",
       description: description || "",
-      ...(tags !== undefined && { tags }),
+      ...(normalizedTags !== undefined && { tags: normalizedTags }),
       ...(coverImageBlob && { coverImage: coverImageBlob }),
       pages: pagesArray,
       publishedAt:
diff --git a/app/(home-pages)/tag/[tag]/getDocumentsByTag.ts b/app/(home-pages)/tag/[tag]/getDocumentsByTag.ts
index ebaffbe0..98b8d699 100644
--- a/app/(home-pages)/tag/[tag]/getDocumentsByTag.ts
+++ b/app/(home-pages)/tag/[tag]/getDocumentsByTag.ts
@@ -14,7 +14,11 @@ import { deduplicateByUriOrdered } from "src/utils/deduplicateRecords";
 export async function getDocumentsByTag(
   tag: string,
 ): Promise<{ posts: Post[] }> {
-  // Query documents that have this tag
+  // Normalize tag to lowercase for case-insensitive matching
+  const normalizedTag = tag.toLowerCase();
+
+  // Query documents that have this tag (case-insensitive)
+  // Use ilike on the JSONB text cast to match regardless of stored case
   const { data: rawDocuments, error } = await supabaseServerClient
     .from("documents")
     .select(
@@ -23,7 +27,7 @@ export async function getDocumentsByTag(
       document_mentions_in_bsky(count),
       documents_in_publications(publications(*))`,
     )
-    .contains("data->tags", `["${tag}"]`)
+    .filter("data->>tags", "ilike", `%"${normalizedTag}"%`)
     .order("sort_date", { ascending: false })
     .limit(50);
 
diff --git a/components/Tags.tsx b/components/Tags.tsx
index d2266e9a..984f0bb6 100644
--- a/components/Tags.tsx
+++ b/components/Tags.tsx
@@ -109,8 +109,10 @@ export const TagSearchInput = (props: {
   }
 
   function selectTag(tag: string) {
-    console.log("selected " + tag);
-    props.setSelectedTags([...props.selectedTags, tag]);
+    // Normalize tag to lowercase for consistent storage and querying
+    const normalizedTag = tag.toLowerCase();
+    console.log("selected " + normalizedTag);
+    props.setSelectedTags([...props.selectedTags, normalizedTag]);
     clearTagInput();
   }
 
@@ -150,12 +152,12 @@ export const TagSearchInput = (props: {
   return (
     <div className="relative">
       <Input
-        className="input-with-border grow w-full outline-none!"
+        className="input-with-border grow w-full outline-none! lowercase"
         id="placeholder-tag-search-input"
         value={tagInputValue}
         placeholder="search tags…"
         onChange={(e) => {
-          setTagInputValue(e.target.value);
+          setTagInputValue(e.target.value.toLowerCase());
           setIsOpen(true);
           setHighlightedIndex(0);
         }}
@@ -193,7 +195,7 @@ export const TagSearchInput = (props: {
             placeholder="search tags…"
             value={tagInputValue}
             onChange={(e) => {
-              setTagInputValue(e.target.value);
+              setTagInputValue(e.target.value.toLowerCase());
               setIsOpen(true);
               setHighlightedIndex(0);
             }}
diff --git a/src/replicache/mutations.ts b/src/replicache/mutations.ts
index d8bf93c6..d61c9d11 100644
--- a/src/replicache/mutations.ts
+++ b/src/replicache/mutations.ts
@@ -660,6 +660,9 @@ const updatePublicationDraft: Mutation<{
   cover_image?: string | null;
   localPublishedAt?: string | null;
 }> = async (args, ctx) => {
+  // Normalize tags to lowercase for consistent storage and querying
+  const normalizedTags = args.tags?.map((tag) => tag.toLowerCase());
+
   await ctx.runOnServer(async (serverCtx) => {
     console.log("updating");
     const updates: {
@@ -670,7 +673,7 @@ const updatePublicationDraft: Mutation<{
     } = {};
     if (args.description !== undefined) updates.description = args.description;
     if (args.title !== undefined) updates.title = args.title;
-    if (args.tags !== undefined) updates.tags = args.tags;
+    if (normalizedTags !== undefined) updates.tags = normalizedTags;
     if (args.cover_image !== undefined) updates.cover_image = args.cover_image;
 
     if (Object.keys(updates).length > 0) {
@@ -695,7 +698,8 @@ const updatePublicationDraft: Mutation<{
     if (args.title !== undefined) await tx.set("publication_title", args.title);
     if (args.description !== undefined)
       await tx.set("publication_description", args.description);
-    if (args.tags !== undefined) await tx.set("publication_tags", args.tags);
+    if (normalizedTags !== undefined)
+      await tx.set("publication_tags", normalizedTags);
     if (args.cover_image !== undefined)
       await tx.set("publication_cover_image", args.cover_image);
     if (args.localPublishedAt !== undefined)