diff --git a/.server-changes/invite-email-case-insensitive.md b/.server-changes/invite-email-case-insensitive.md
new file mode 100644
index 000000000..60b4df0d1
--- /dev/null
+++ b/.server-changes/invite-email-case-insensitive.md
@@ -0,0 +1,12 @@
+---
+area: webapp
+type: fix
+---
+
+Org member invites now match emails case-insensitively. Previously an invite
+created with different casing than the invitee's account email (e.g.
+"Andreas@example.com" vs "andreas@example.com") could never be accepted —
+the accept route compared emails strictly and the pending-invite lookups
+were exact-match. Invite emails are now lowercased on creation, and all
+invite-by-email lookups (accept, decline, pending list) match
+case-insensitively so existing mixed-case invite rows still work.
diff --git a/apps/webapp/app/models/member.server.ts b/apps/webapp/app/models/member.server.ts
index b88fc7e11..bf5421d45 100644
--- a/apps/webapp/app/models/member.server.ts
+++ b/apps/webapp/app/models/member.server.ts
@@ -156,7 +156,7 @@ export async function getInviteFromToken({ token }: { token: string }) {
 export async function getUsersInvites({ email }: { email: string }) {
   return await prisma.orgMemberInvite.findMany({
     where: {
-      email,
+      email: { equals: email, mode: "insensitive" },
       organization: {
         deletedAt: null,
       },
@@ -180,7 +180,7 @@ export async function acceptInvite({
     const invite = await tx.orgMemberInvite.delete({
       where: {
         id: inviteId,
-        email: user.email,
+        email: { equals: user.email, mode: "insensitive" },
       },
       include: {
         organization: {
@@ -215,7 +215,7 @@ export async function acceptInvite({
     // 4. Check for other invites
     const remainingInvites = await tx.orgMemberInvite.findMany({
       where: {
-        email: user.email,
+        email: { equals: user.email, mode: "insensitive" },
       },
     });
 
@@ -259,7 +259,7 @@ export async function declineInvite({
     const declinedInvite = await prisma.orgMemberInvite.delete({
       where: {
         id: inviteId,
-        email: user.email,
+        email: { equals: user.email, mode: "insensitive" },
       },
       include: {
         organization: true,
@@ -269,7 +269,7 @@ export async function declineInvite({
     //2. check for other invites
     const remainingInvites = await prisma.orgMemberInvite.findMany({
       where: {
-        email: user.email,
+        email: { equals: user.email, mode: "insensitive" },
       },
     });
 
diff --git a/apps/webapp/app/routes/_app.orgs.$organizationSlug.invite/route.tsx b/apps/webapp/app/routes/_app.orgs.$organizationSlug.invite/route.tsx
index f77c19ffb..89cfb9513 100644
--- a/apps/webapp/app/routes/_app.orgs.$organizationSlug.invite/route.tsx
+++ b/apps/webapp/app/routes/_app.orgs.$organizationSlug.invite/route.tsx
@@ -149,7 +149,7 @@ const schema = z.object({
     }
 
     return [""];
-  }, z.string().email().array().nonempty("At least one email is required")),
+  }, z.string().trim().toLowerCase().email().array().nonempty("At least one email is required")),
   rbacRoleId: z.string().optional(),
 });
 
diff --git a/apps/webapp/app/routes/invite-accept.tsx b/apps/webapp/app/routes/invite-accept.tsx
index 592384b95..b777ea393 100644
--- a/apps/webapp/app/routes/invite-accept.tsx
+++ b/apps/webapp/app/routes/invite-accept.tsx
@@ -34,7 +34,7 @@ export async function loader({ request }: LoaderFunctionArgs) {
     );
   }
 
-  if (invite.email !== user.email) {
+  if (invite.email.toLowerCase() !== user.email.toLowerCase()) {
     return redirectWithErrorMessage(
       "/",
       request,