diff --git a/apps/frontend/package.json b/apps/frontend/package.json
index 8852cd5123..d143b5699e 100644
--- a/apps/frontend/package.json
+++ b/apps/frontend/package.json
@@ -38,6 +38,7 @@
 		"wrangler": "^4.115.0"
 	},
 	"dependencies": {
+		"@contentauth/c2pa-web": "^0.13.1",
 		"@formatjs/intl-localematcher": "^0.5.4",
 		"@ltd/j-toml": "^1.38.0",
 		"@modrinth/api-client": "workspace:*",
diff --git a/apps/frontend/src/components/ui/AiImageWarningModal.vue b/apps/frontend/src/components/ui/AiImageWarningModal.vue
new file mode 100644
index 0000000000..70f0acc92a
--- /dev/null
+++ b/apps/frontend/src/components/ui/AiImageWarningModal.vue
@@ -0,0 +1,52 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="formatMessage(messages.title)"
+		:closable="false"
+		fade="warning"
+		max-width="544px"
+	>
+		<div class="flex flex-col">
+			<p class="mb-4 mt-0 leading-normal">
+				{{ formatMessage(messages.body) }}
+			</p>
+			<div class="flex justify-end">
+				<Button type="colored" color="brand" native-type="button" @click="hide">
+					<CheckCircleIcon class="size-4" />
+					{{ formatMessage(commonMessages.iUnderstandButton) }}
+				</Button>
+			</div>
+		</div>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { CheckCircleIcon } from '@modrinth/assets'
+import { Button, commonMessages, defineMessages, NewModal, useVIntl } from '@modrinth/ui'
+import { useTemplateRef } from 'vue'
+
+const { formatMessage } = useVIntl()
+const modal = useTemplateRef('modal')
+
+const messages = defineMessages({
+	title: {
+		id: 'project.ai-image-warning-modal.title',
+		defaultMessage: 'AI-generated images not allowed',
+	},
+	body: {
+		id: 'project.ai-image-warning-modal.body',
+		defaultMessage:
+			'Using AI-generated images to represent your project is not allowed. Attempting to work around detection may lead to your Modrinth account being suspended.',
+	},
+})
+
+function show() {
+	modal.value?.show()
+}
+
+function hide() {
+	modal.value?.hide()
+}
+
+defineExpose({ show, hide })
+</script>
diff --git a/apps/frontend/src/helpers/c2pa.ts b/apps/frontend/src/helpers/c2pa.ts
new file mode 100644
index 0000000000..59c524176a
--- /dev/null
+++ b/apps/frontend/src/helpers/c2pa.ts
@@ -0,0 +1,41 @@
+import type { C2paSdk } from '@contentauth/c2pa-web'
+import { createC2pa, isSupportedReaderFormat } from '@contentauth/c2pa-web/inline'
+
+// https://cv.iptc.org/newscodes/digitalsourcetype/
+// only detecting generative AI types
+const AI_DIGITAL_SOURCE_TYPES = [
+	'http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia',
+	'http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicData',
+	'http://cv.iptc.org/newscodes/digitalsourcetype/compositeWithTrainedAlgorithmicMedia',
+	'http://cv.iptc.org/newscodes/digitalsourcetype/compositeSynthetic',
+]
+
+let c2paInstance: Promise<C2paSdk> | null = null
+
+function getC2pa() {
+	if (!c2paInstance) {
+		c2paInstance = createC2pa()
+	}
+	return c2paInstance
+}
+
+// reference: https://github.com/contentauth/c2pa-js/blob/main/packages/c2pa-web/README.md
+export async function fileDeclaresAi(file: File): Promise<boolean> {
+	try {
+		if (!isSupportedReaderFormat(file.type)) {
+			return false
+		}
+
+		const c2pa = await getC2pa()
+
+		const reader = await c2pa.reader.fromBlob(file.type, file)
+		const manifestStore = await reader.manifestStore()
+
+		await reader.free()
+
+		const manifestJson = JSON.stringify(manifestStore)
+		return AI_DIGITAL_SOURCE_TYPES.some((type) => manifestJson.includes(type))
+	} catch {
+		return false
+	}
+}
diff --git a/apps/frontend/src/locales/en-US/index.json b/apps/frontend/src/locales/en-US/index.json
index 59ebe60622..65de00e4e8 100644
--- a/apps/frontend/src/locales/en-US/index.json
+++ b/apps/frontend/src/locales/en-US/index.json
@@ -3485,6 +3485,12 @@
   "project.actions.servers-promo.title": {
     "message": "Create a server"
   },
+  "project.ai-image-warning-modal.body": {
+    "message": "Using AI-generated images to represent your project is not allowed. Attempting to work around detection may lead to your Modrinth account being suspended."
+  },
+  "project.ai-image-warning-modal.title": {
+    "message": "AI-generated images not allowed"
+  },
   "project.collections.create-new": {
     "message": "Create new collection"
   },
diff --git a/apps/frontend/src/pages/[type]/[project]/gallery.vue b/apps/frontend/src/pages/[type]/[project]/gallery.vue
index d6b539e2da..c4e3f0c677 100644
--- a/apps/frontend/src/pages/[type]/[project]/gallery.vue
+++ b/apps/frontend/src/pages/[type]/[project]/gallery.vue
@@ -1,5 +1,6 @@
 <template>
 	<div>
+		<AiImageWarningModal ref="aiImageWarningModal" />
 		<Modal
 			v-if="currentMember"
 			ref="modal_edit_item"
@@ -18,12 +19,7 @@
 							:accept="acceptFileTypes"
 							:max-size="5242880"
 							aria-label="Replace image"
-							@change="
-								(x) => {
-									editFile = x[0]
-									showPreviewImage()
-								}
-							"
+							@change="replaceEditFile"
 						>
 							<TransferIcon aria-hidden="true" />
 						</FileButton>
@@ -315,6 +311,8 @@ import {
 } from '@modrinth/ui'
 import { useEventListener } from '@vueuse/core'
 
+import AiImageWarningModal from '~/components/ui/AiImageWarningModal.vue'
+import { fileDeclaresAi } from '~/helpers/c2pa'
 import { isPermission } from '~/utils/permissions.ts'
 
 const formatDate = useFormatDateTime({
@@ -333,6 +331,7 @@ const {
 } = injectProjectPageContext()
 
 // Template refs
+const aiImageWarningModal = useTemplateRef('aiImageWarningModal')
 const modalEditItem = useTemplateRef('modal_edit_item')
 const modalConfirm = useTemplateRef('modal_confirm')
 
@@ -439,14 +438,35 @@ function resetEdit() {
 	previewImage.value = null
 }
 
-function handleFiles(files: File[]) {
+async function handleFiles(files: File[]) {
+	const file = files[0]
+	if (!file) {
+		return
+	}
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
 	resetEdit()
-	editFile.value = files[0]
+	editFile.value = file
 
 	showPreviewImage()
 	modalEditItem.value?.show()
 }
 
+async function replaceEditFile(files: File[]) {
+	const file = files[0]
+	if (!file) {
+		return
+	}
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
+	editFile.value = file
+	showPreviewImage()
+}
+
 function showPreviewImage() {
 	const reader = new FileReader()
 	if (editFile.value instanceof Blob) {
diff --git a/apps/frontend/src/pages/[type]/[project]/settings/description.vue b/apps/frontend/src/pages/[type]/[project]/settings/description.vue
index ac31b035f7..9293f05ac6 100644
--- a/apps/frontend/src/pages/[type]/[project]/settings/description.vue
+++ b/apps/frontend/src/pages/[type]/[project]/settings/description.vue
@@ -1,5 +1,6 @@
 <template>
 	<div>
+		<AiImageWarningModal ref="aiImageWarningModal" />
 		<ConfirmLeaveModal ref="confirmLeaveModal" />
 		<div class="universal-card">
 			<div class="markdown-disclaimer">
@@ -51,11 +52,14 @@ import {
 	useSavable,
 } from '@modrinth/ui'
 import { TeamMemberPermission } from '@modrinth/utils'
-import { computed } from 'vue'
+import { computed, useTemplateRef } from 'vue'
 
+import AiImageWarningModal from '~/components/ui/AiImageWarningModal.vue'
 import { useImageUpload } from '~/composables/image-upload.ts'
+import { fileDeclaresAi } from '~/helpers/c2pa'
 
 const { projectV2: project, currentMember, patchProject } = injectProjectPageContext()
+const aiImageWarningModal = useTemplateRef('aiImageWarningModal')
 
 useProjectSettingsHeadTitle(commonProjectSettingsMessages.description)
 
@@ -80,6 +84,10 @@ const descriptionWarning = computed(() => {
 })
 
 async function onUploadHandler(file: File) {
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
 	const response = await useImageUpload(file, {
 		context: 'project',
 		projectID: project.value.id,
diff --git a/apps/frontend/src/pages/[type]/[project]/settings/gallery.vue b/apps/frontend/src/pages/[type]/[project]/settings/gallery.vue
index 6dc7d82f3c..f54f48f9f8 100644
--- a/apps/frontend/src/pages/[type]/[project]/settings/gallery.vue
+++ b/apps/frontend/src/pages/[type]/[project]/settings/gallery.vue
@@ -1,5 +1,6 @@
 <template>
 	<div>
+		<AiImageWarningModal ref="aiImageWarningModal" />
 		<Modal
 			v-if="currentMember"
 			ref="modal_edit_item"
@@ -18,12 +19,7 @@
 							:accept="acceptFileTypes"
 							:max-size="5242880"
 							aria-label="Replace image"
-							@change="
-								(x) => {
-									editFile = x[0]
-									showPreviewImage()
-								}
-							"
+							@change="replaceEditFile"
 						>
 							<TransferIcon aria-hidden="true" />
 						</FileButton>
@@ -305,6 +301,8 @@ import {
 	useFormatDateTime,
 } from '@modrinth/ui'
 
+import AiImageWarningModal from '~/components/ui/AiImageWarningModal.vue'
+import { fileDeclaresAi } from '~/helpers/c2pa'
 import { isPermission } from '~/utils/permissions.ts'
 
 const formatDate = useFormatDateTime({
@@ -323,6 +321,7 @@ const {
 
 useProjectSettingsHeadTitle(commonProjectSettingsMessages.gallery)
 
+const aiImageWarningModal = ref(null)
 const modal_edit_item = ref(null)
 const modal_confirm = ref(null)
 
@@ -380,14 +379,35 @@ const resetEdit = () => {
 	previewImage.value = null
 }
 
-const handleFiles = (files) => {
+const handleFiles = async (files) => {
+	const file = files[0]
+	if (!file) {
+		return
+	}
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
 	resetEdit()
-	editFile.value = files[0]
+	editFile.value = file
 
 	showPreviewImage()
 	modal_edit_item.value.show()
 }
 
+const replaceEditFile = async (files) => {
+	const file = files[0]
+	if (!file) {
+		return
+	}
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
+	editFile.value = file
+	showPreviewImage()
+}
+
 const showPreviewImage = () => {
 	const reader = new FileReader()
 	if (editFile.value instanceof Blob) {
diff --git a/apps/frontend/src/pages/[type]/[project]/settings/index.vue b/apps/frontend/src/pages/[type]/[project]/settings/index.vue
index 14efb19e19..deb1d467d6 100644
--- a/apps/frontend/src/pages/[type]/[project]/settings/index.vue
+++ b/apps/frontend/src/pages/[type]/[project]/settings/index.vue
@@ -1,5 +1,6 @@
 <template>
 	<div>
+		<AiImageWarningModal ref="aiImageWarningModal" />
 		<ConfirmModal
 			ref="modal_confirm"
 			:title="formatMessage(messages.deleteConfirmationTitle)"
@@ -322,7 +323,9 @@ import {
 } from '@modrinth/ui'
 import { fileIsValid, formatProjectStatus } from '@modrinth/utils'
 
+import AiImageWarningModal from '~/components/ui/AiImageWarningModal.vue'
 import { useAuth } from '~/composables/auth.js'
+import { fileDeclaresAi } from '~/helpers/c2pa'
 import { getProjectTypeForUrl } from '~/helpers/projects.js'
 
 const auth = await useAuth()
@@ -337,6 +340,7 @@ const {
 	invalidate,
 } = injectProjectPageContext()
 const { labrinth } = injectModrinthClient()
+const aiImageWarningModal = useTemplateRef('aiImageWarningModal')
 
 useProjectSettingsHeadTitle(commonProjectSettingsMessages.general)
 
@@ -553,9 +557,17 @@ async function handleSave() {
 	}
 }
 
-const showPreviewImage = (files) => {
+const showPreviewImage = async (files) => {
+	const file = files[0]
+	if (!file) {
+		return
+	}
+	if (await fileDeclaresAi(file)) {
+		aiImageWarningModal.value?.show()
+		return
+	}
 	const reader = new FileReader()
-	icon.value = files[0]
+	icon.value = file
 	deletedIcon.value = false
 	reader.readAsDataURL(icon.value)
 	reader.onload = (event) => {
diff --git a/packages/ui/src/components/modal/PhotosensitivityWarningModal.vue b/packages/ui/src/components/modal/PhotosensitivityWarningModal.vue
index f8829e755a..bd1292b40e 100644
--- a/packages/ui/src/components/modal/PhotosensitivityWarningModal.vue
+++ b/packages/ui/src/components/modal/PhotosensitivityWarningModal.vue
@@ -23,7 +23,7 @@
 				<Checkbox v-model="dontShowAgain" :label="formatMessage(messages.dontShowAgain)" />
 				<Button type="colored" color="brand" native-type="button" @click="acknowledge">
 					<CheckCircleIcon class="size-4" />
-					{{ formatMessage(messages.iUnderstand) }}
+					{{ formatMessage(commonMessages.iUnderstandButton) }}
 				</Button>
 			</div>
 		</div>
@@ -37,6 +37,7 @@ import { ref, useTemplateRef } from 'vue'
 import { Button } from '#ui/components/base/buttons'
 
 import { defineMessages, useVIntl } from '../../composables/i18n'
+import { commonMessages } from '../../utils/common-messages'
 import Checkbox from '../base/Checkbox.vue'
 import NewModal from './NewModal.vue'
 
@@ -72,10 +73,6 @@ const messages = defineMessages({
 		id: 'search.photosensitivity-warning-modal.dont-show-again',
 		defaultMessage: "Don't show this again",
 	},
-	iUnderstand: {
-		id: 'search.photosensitivity-warning-modal.i-understand',
-		defaultMessage: 'I understand',
-	},
 })
 
 function show() {
diff --git a/packages/ui/src/locales/en-US/index.json b/packages/ui/src/locales/en-US/index.json
index 11a6b78711..6390a79d96 100644
--- a/packages/ui/src/locales/en-US/index.json
+++ b/packages/ui/src/locales/en-US/index.json
@@ -206,6 +206,9 @@
   "button.hide-snapshots": {
     "defaultMessage": "Hide snapshots"
   },
+  "button.i-understand": {
+    "defaultMessage": "I understand"
+  },
   "button.install": {
     "defaultMessage": "Install"
   },
@@ -3989,9 +3992,6 @@
   "search.photosensitivity-warning-modal.dont-show-again": {
     "defaultMessage": "Don't show this again"
   },
-  "search.photosensitivity-warning-modal.i-understand": {
-    "defaultMessage": "I understand"
-  },
   "search.photosensitivity-warning-modal.title": {
     "defaultMessage": "Results are not guaranteed to be safe"
   },
diff --git a/packages/ui/src/utils/common-messages.ts b/packages/ui/src/utils/common-messages.ts
index 4969db59b4..9e17da915e 100644
--- a/packages/ui/src/utils/common-messages.ts
+++ b/packages/ui/src/utils/common-messages.ts
@@ -176,6 +176,10 @@ export const commonMessages = defineMessages({
 		id: 'input.view.grid',
 		defaultMessage: 'Grid view',
 	},
+	iUnderstandButton: {
+		id: 'button.i-understand',
+		defaultMessage: 'I understand',
+	},
 	listInputView: {
 		id: 'input.view.list',
 		defaultMessage: 'Rows view',
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f3f5accd91..1188e64d27 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -263,6 +263,9 @@ importers:
 
   apps/frontend:
     dependencies:
+      '@contentauth/c2pa-web':
+        specifier: ^0.13.1
+        version: 0.13.1
       '@formatjs/intl-localematcher':
         specifier: ^0.5.4
         version: 0.5.10
@@ -1230,6 +1233,15 @@ packages:
   '@codemirror/view@6.39.12':
     resolution: {integrity: sha512-f+/VsHVn/kOA9lltk/GFzuYwVVAKmOnNjxbrhkk3tPHntFqjWeI2TbIXx006YkBkqC10wZ4NsnWXCQiFPeAISQ==}
 
+  '@contentauth/c2pa-types@0.7.2':
+    resolution: {integrity: sha512-SH+q4a6ZS2z2YhlqfTB2GzN1S4M9koLhJETGPxL5J4JVhJEFSyEQK52PnwOhee+ObiZdDZK18NI+s+1IrUSdTQ==}
+
+  '@contentauth/c2pa-wasm@0.11.0':
+    resolution: {integrity: sha512-pL7tGZnM/qQz7JFCPB0hWSZM41L4aUEF/SV9B1fL+0L2sUZT1Zj7UGcUjSmiRWeXLagQ8Jds7RF+XQ9gxZiG7g==}
+
+  '@contentauth/c2pa-web@0.13.1':
+    resolution: {integrity: sha512-K4GLdhqIdLE3DUdO0Ub2M6rnyopAnCtdOQhFx2ACayVXo6uLuYlMPRlBivqc4RlvuXMpvJcW2BMu6B1FZpbYhw==}
+
   '@crowdin/crowdin-api-client@1.55.2':
     resolution: {integrity: sha512-kEMiz25j9tSfhsyj8dZWdhKPdtTeVu9lWZFBIc+adHXZ8vs6zd4/6xaiYr3PamYhV3rIOBEv8ElyzpUSSO5LGg==}
     engines: {node: '>=12.9.0'}
@@ -6815,6 +6827,9 @@ packages:
   hey-listen@1.0.8:
     resolution: {integrity: sha512-COpmrF2NOg4TBWUJ5UVyaCU2A88wEMkUPK4hNqyCkqHbxT92BbvfjoSozkAIIm6XhicGlJHhFdullInrdhwU8Q==}
 
+  highgain@0.1.0:
+    resolution: {integrity: sha512-Vw/g2upw4MYLZ9e95k79+idMoPFEKvTQVTce9LCDfI+T6AiG+SdiR4WDKszB1grQy0O+uhxd6cqbdi3VhECdbA==}
+
   highlight.js@11.11.1:
     resolution: {integrity: sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w==}
     engines: {node: '>=12.0.0'}
@@ -9470,6 +9485,10 @@ packages:
     resolution: {integrity: sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==}
     engines: {node: '>=6.10'}
 
+  ts-deepmerge@8.0.0:
+    resolution: {integrity: sha512-133O+10nJmVI8w5xeVZPEv5PIrv7iaUae07wv1aH8XJH95Ur6YIhWAPhPyP1YPlbPS9fCVcNIZTu7m8urRVF0A==}
+    engines: {node: '>=14.13.1'}
+
   ts-interface-checker@0.1.13:
     resolution: {integrity: sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==}
 
@@ -10174,8 +10193,8 @@ packages:
   vue-component-type-helpers@3.2.4:
     resolution: {integrity: sha512-05lR16HeZDcDpB23ku5b5f1fBOoHqFnMiKRr2CiEvbG5Ux4Yi0McmQBOET0dR0nxDXosxyVqv67q6CzS3AK8rw==}
 
-  vue-component-type-helpers@3.3.8:
-    resolution: {integrity: sha512-troqCMmQodQDqUqn63NQaFi+CDSclSe7sc8VEBFqf5GFLqmGR2Ph3P2WEC7qwpRVyEWsTi/aAr4vyOe/B1hU3g==}
+  vue-component-type-helpers@3.3.9:
+    resolution: {integrity: sha512-3c/UfMe0SqyEfcGTyH7mfshHagJ9QTCbppCb0/uGpHZpFug7+If3GeGZN7I0YheKEExemx3xldQPoO7PQSOLQg==}
 
   vue-confetti-explosion@1.0.2:
     resolution: {integrity: sha512-80OboM3/6BItIoZ6DpNcZFqGpF607kjIVc5af56oKgtFmt5yWehvJeoYhkzYlqxrqdBe0Ko4Ie3bWrmLau+dJw==}
@@ -11029,6 +11048,17 @@ snapshots:
       style-mod: 4.1.3
       w3c-keyname: 2.2.8
 
+  '@contentauth/c2pa-types@0.7.2': {}
+
+  '@contentauth/c2pa-wasm@0.11.0': {}
+
+  '@contentauth/c2pa-web@0.13.1':
+    dependencies:
+      '@contentauth/c2pa-types': 0.7.2
+      '@contentauth/c2pa-wasm': 0.11.0
+      highgain: 0.1.0
+      ts-deepmerge: 8.0.0
+
   '@crowdin/crowdin-api-client@1.55.2':
     dependencies:
       axios: 1.16.1
@@ -13822,7 +13852,7 @@ snapshots:
       storybook: 10.2.4(@testing-library/dom@10.4.1)(prettier@3.8.1)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
       type-fest: 2.19.0
       vue: 3.5.27(typescript@5.9.3)
-      vue-component-type-helpers: 3.3.8
+      vue-component-type-helpers: 3.3.9
 
   '@stripe/stripe-js@7.9.0': {}
 
@@ -17067,6 +17097,8 @@ snapshots:
 
   hey-listen@1.0.8: {}
 
+  highgain@0.1.0: {}
+
   highlight.js@11.11.1: {}
 
   highlightjs-mcfunction@https://codeload.github.com/modrinth/better-highlightjs-mcfunction/tar.gz/aa999b763fd792ffb950d28347eeb6811c83ea8e: {}
@@ -20384,6 +20416,8 @@ snapshots:
 
   ts-dedent@2.2.0: {}
 
+  ts-deepmerge@8.0.0: {}
+
   ts-interface-checker@0.1.13: {}
 
   ts-map@1.0.3: {}
@@ -21040,7 +21074,7 @@ snapshots:
 
   vue-component-type-helpers@3.2.4: {}
 
-  vue-component-type-helpers@3.3.8: {}
+  vue-component-type-helpers@3.3.9: {}
 
   vue-confetti-explosion@1.0.2(vue@3.5.27(typescript@5.9.3)):
     dependencies: