diff --git a/src/lib/components/PostCard.svelte b/src/lib/components/PostCard.svelte
index aa5d750..1decfe9 100644
--- a/src/lib/components/PostCard.svelte
+++ b/src/lib/components/PostCard.svelte
@@ -137,7 +137,7 @@
 			<Button
 				variant="ghost"
 				disabled={!$sesionStore?.accessToken}
-				class="flex items-center gap-2 rounded-full bg-accent p-3 text-lg"
+				class={`${post.isLiked ? 'bg-blue-500/30' : 'bg-accent'} flex items-center gap-2 rounded-full p-3 text-lg`}
 				onclick={() => likeHandler()}
 			>
 				<p>
diff --git a/src/lib/components/admin/ModificarUsuario.svelte b/src/lib/components/admin/ModificarUsuario.svelte
index bf5cfd4..f2b77f7 100644
--- a/src/lib/components/admin/ModificarUsuario.svelte
+++ b/src/lib/components/admin/ModificarUsuario.svelte
@@ -85,7 +85,9 @@
 								Aceptar
 							{/if}
 						</Button>
-						<Button variant="secondary" disabled={cargando}>Cerrar</Button>
+						<Button variant="secondary" disabled={cargando} onclick={() => (open = !open)}
+							>Cerrar</Button
+						>
 					</div>
 				</div>
 			</form>
diff --git a/src/lib/components/signup-form.svelte b/src/lib/components/signup-form.svelte
index f9e529c..aaa9f61 100644
--- a/src/lib/components/signup-form.svelte
+++ b/src/lib/components/signup-form.svelte
@@ -6,16 +6,50 @@
 	import type { RegisterDto } from '../../types';
 	import { register } from '@/hooks/register';
 	import Loader2Icon from '@lucide/svelte/icons/loader-2';
+	import Check from '@lucide/svelte/icons/check';
+	import Cross from '@lucide/svelte/icons/x';
+
+	import Spinner from './ui/spinner/spinner.svelte';
+	import { checkUsername } from '@/hooks/checkUsername';
+	import { checkEmail } from '@/hooks/checkEmail';
 
 	let { showAlert = $bindable() } = $props();
 
 	let cargando = $state(false);
 
-	const setAlert = () => (showAlert = true);
+	let repetirContraseña = $state('');
+
+	let checkeandoUsuario: boolean | null = $state(null);
+	let esUsuarioValido = $state(false);
+
+	let checkeandoEmail: boolean | null = $state(null);
+	let esEmailValido = $state(false);
 
 	let dto: RegisterDto = $state({ password: '', username: '', email: '', displayName: '' });
 
+	let coinsidenLasPass = $derived(repetirContraseña == dto.password);
+
+	const passwordRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z0-9])[A-Za-z\d\W_]*$/;
+	let esContraseñaValida = $derived(passwordRegex.test(dto.password));
+
+	async function checkUsuario() {
+		checkeandoUsuario = true;
+		esUsuarioValido = await checkUsername(dto.username);
+		checkeandoUsuario = false;
+	}
+
+	async function checkEmaill() {
+		checkeandoEmail = true;
+		esEmailValido = await checkEmail(dto.email);
+		checkeandoEmail = false;
+	}
+	const setAlert = () => (showAlert = true);
+
 	const handleSubmit = async (e: SubmitEvent) => {
+		if (esUsuarioValido == false) return;
+		if (!coinsidenLasPass) return;
+		if (!esContraseñaValida) return;
+
 		cargando = true;
 		await register(e, dto, setAlert);
 		cargando = false;
@@ -31,8 +65,26 @@
 		<form onsubmit={handleSubmit}>
 			<Field.Group>
 				<Field.Field>
-					<Field.Label for="name">Nombre de Usuario</Field.Label>
-					<Input id="name" bind:value={dto.username} type="text" placeholder="JPepe" required />
+					<div class="flex justify-between">
+						<Field.Label for="name">Nombre de Usuario</Field.Label>
+						{#if checkeandoUsuario == null}
+							<div hidden></div>
+						{:else if checkeandoUsuario == true}
+							<Spinner></Spinner>
+						{:else if esUsuarioValido}
+							<Check class="text-green-500" />
+						{:else}
+							<Cross class="text-red-500" />
+						{/if}
+					</div>
+					<Input
+						id="name"
+						bind:value={dto.username}
+						type="text"
+						placeholder="JPepe"
+						required
+						onchange={checkUsuario}
+					/>
 				</Field.Field>
 
 				<Field.Field>
@@ -41,28 +93,55 @@
 				</Field.Field>
 
 				<Field.Field>
-					<Field.Label for="email">Email</Field.Label>
+					<div class="flex justify-between">
+						<Field.Label for="email">Email</Field.Label>
+						{#if checkeandoEmail == null}
+							<div hidden></div>
+						{:else if checkeandoEmail == true}
+							<Spinner></Spinner>
+						{:else if esEmailValido}
+							<Check class="text-green-500" />
+						{:else}
+							<Cross class="text-red-500" />
+						{/if}
+					</div>
 					<Input
 						id="email"
 						type="email"
 						bind:value={dto.email}
 						placeholder="m@ejemplo.com"
 						required
+						onchange={checkEmaill}
 					/>
 				</Field.Field>
 				<Field.Field>
 					<Field.Label for="password">Contraseña</Field.Label>
-					<Input id="password" type="password" bind:value={dto.password} required />
-					<Field.Description>Debe de tener por lo menos 8 caracteres.</Field.Description>
+					<Input
+						id="password"
+						type="password"
+						bind:value={dto.password}
+						required
+						class={{ 'border-red-500': dto.password && !esContraseñaValida }}
+					/>
+					<Field.Description
+						>Debe de tener por lo menos 8 caracteres, una minúscula, una mayúscula, un número y un
+						carácter especial.</Field.Description
+					>
 				</Field.Field>
 				<Field.Field>
 					<Field.Label for="confirm-password">Confirmar Contraseña</Field.Label>
-					<Input id="confirm-password" type="password" required />
+					<Input
+						id="confirm-password"
+						type="password"
+						required
+						bind:value={repetirContraseña}
+						class={{ 'border-red-500': !coinsidenLasPass }}
+					/>
 					<Field.Description>Confirma la contraseña</Field.Description>
 				</Field.Field>
 				<Field.Group>
 					<Field.Field>
-						<Button type="submit" disabled={cargando}>
+						<Button type="submit" disabled={cargando || !coinsidenLasPass || !esContraseñaValida}>
 							{#if cargando}
 								Creando Cuenta...
 								<Loader2Icon class="animate-spin" />
diff --git a/src/lib/hooks/checkEmail.ts b/src/lib/hooks/checkEmail.ts
new file mode 100644
index 0000000..2bbc8e8
--- /dev/null
+++ b/src/lib/hooks/checkEmail.ts
@@ -0,0 +1,16 @@
+import { apiBase } from "@/stores/url";
+import { get } from "svelte/store";
+
+export async function checkEmail(email: string) {
+  try {
+    const req = await fetch(`${get(apiBase)}/api/users/check-email/${email}`, {
+      method: "GET"
+    });
+    if (req.ok){
+      return (await req.json()).available;
+    }
+    return false;
+  } catch {
+    return false;
+  }
+}
diff --git a/src/lib/hooks/checkUsername.ts b/src/lib/hooks/checkUsername.ts
new file mode 100644
index 0000000..2d82818
--- /dev/null
+++ b/src/lib/hooks/checkUsername.ts
@@ -0,0 +1,16 @@
+import { apiBase } from "@/stores/url";
+import { get } from "svelte/store";
+
+export async function checkUsername(username: string) {
+  try {
+    const req = await fetch(`${get(apiBase)}/api/users/check-username/${username}`, {
+      method: "GET"
+    });
+    if (req.ok){
+      return (await req.json()).available;
+    }
+    return false;
+  } catch {
+    return false;
+  }
+}
diff --git a/src/types.d.ts b/src/types.d.ts
index a134d27..c7749ce 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -47,10 +47,10 @@ export interface LoginDto {
 }
 
 export interface RegisterDto {
-	username: string?;
-	email: string?;
+	username: string;
+	email: string;
 	password: string?;
-	displayName: string?;
+	displayName: string;
 }
 
 export interface CreatePostDto {