diff --git a/modules/restapi/src/main/resources/docspell-openapi.yml b/modules/restapi/src/main/resources/docspell-openapi.yml
index 85727329..4b38a930 100644
--- a/modules/restapi/src/main/resources/docspell-openapi.yml
+++ b/modules/restapi/src/main/resources/docspell-openapi.yml
@@ -1844,6 +1844,7 @@ components:
         - created
         - updated
         - attachments
+        - sources
         - tags
       properties:
         id:
@@ -1890,6 +1891,10 @@ components:
           type: array
           items:
             $ref: "#/components/schemas/Attachment"
+        sources:
+          type: array
+          items:
+            $ref: "#/components/schemas/AttachmentSource"
         tags:
           type: array
           items:
@@ -1901,6 +1906,7 @@ components:
         - id
         - size
         - contentType
+        - converted
       properties:
         id:
           type: string
@@ -1913,6 +1919,29 @@ components:
         contentType:
           type: string
           format: mimetype
+        converted:
+          type: boolean
+    AttachmentSource:
+      description: |
+        The source or original file of an attachment.
+      required:
+        - id
+        - size
+        - contentType
+      properties:
+        id:
+          type: string
+          format: ident
+          description: |
+            The id is the attachment id.
+        name:
+          type: string
+        size:
+          type: integer
+          format: int64
+        contentType:
+          type: string
+          format: mimetype
     Registration:
       description: |
         Data for registering a new account.
diff --git a/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala b/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
index a7e3db2e..a018e2ac 100644
--- a/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
+++ b/modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala
@@ -84,12 +84,18 @@ trait Conversions {
       data.inReplyTo.map(mkIdName),
       data.item.dueDate,
       data.item.notes,
-      data.attachments.map((mkAttachment _).tupled).toList,
+      data.attachments.map((mkAttachment(data)_).tupled).toList,
+      data.sources.map((mkAttachmentSource _).tupled).toList,
       data.tags.map(mkTag).toList
     )
 
-  def mkAttachment(ra: RAttachment, m: FileMeta): Attachment =
-    Attachment(ra.id, ra.name, m.length, MimeType.unsafe(m.mimetype.asString))
+  def mkAttachment(item: OItem.ItemData)(ra: RAttachment, m: FileMeta): Attachment = {
+    val converted = item.sources.find(_._1.id == ra.id).exists(_._2.checksum != m.checksum)
+    Attachment(ra.id, ra.name, m.length, MimeType.unsafe(m.mimetype.asString), converted)
+  }
+
+  def mkAttachmentSource(ra: RAttachmentSource, m: FileMeta): AttachmentSource =
+    AttachmentSource(ra.id, ra.name, m.length, MimeType.unsafe(m.mimetype.asString))
 
   // item list
 
diff --git a/modules/store/src/main/scala/docspell/store/queries/QItem.scala b/modules/store/src/main/scala/docspell/store/queries/QItem.scala
index 1927c01d..21cd0d75 100644
--- a/modules/store/src/main/scala/docspell/store/queries/QItem.scala
+++ b/modules/store/src/main/scala/docspell/store/queries/QItem.scala
@@ -23,7 +23,8 @@ object QItem {
       concEquip: Option[REquipment],
       inReplyTo: Option[IdRef],
       tags: Vector[RTag],
-      attachments: Vector[(RAttachment, FileMeta)]
+    attachments: Vector[(RAttachment, FileMeta)],
+      sources: Vector[(RAttachmentSource, FileMeta)]
   ) {
 
     def filterCollective(coll: Ident): Option[ItemData] =
@@ -69,14 +70,16 @@ object QItem {
       ]
       .option
     val attachs = RAttachment.findByItemWithMeta(id)
+    val sources = RAttachmentSource.findByItemWithMeta(id)
 
     val tags = RTag.findByItem(id)
 
     for {
       data <- q
       att  <- attachs
+      srcs <- sources
       ts   <- tags
-    } yield data.map(d => ItemData(d._1, d._2, d._3, d._4, d._5, d._6, ts, att))
+    } yield data.map(d => ItemData(d._1, d._2, d._3, d._4, d._5, d._6, ts, att, srcs))
   }
 
   case class ListItem(
diff --git a/modules/store/src/main/scala/docspell/store/records/RAttachmentSource.scala b/modules/store/src/main/scala/docspell/store/records/RAttachmentSource.scala
index e15a7a2f..cf90f2d3 100644
--- a/modules/store/src/main/scala/docspell/store/records/RAttachmentSource.scala
+++ b/modules/store/src/main/scala/docspell/store/records/RAttachmentSource.scala
@@ -1,5 +1,6 @@
 package docspell.store.records
 
+import bitpeace.FileMeta
 import doobie._
 import doobie.implicits._
 import docspell.common._
@@ -60,5 +61,24 @@ object RAttachmentSource {
     selectSimple(all.map(_.prefix("a")), from, where).query[RAttachmentSource].option
   }
 
+  def findByItemWithMeta(id: Ident): ConnectionIO[Vector[(RAttachmentSource, FileMeta)]] = {
+    import bitpeace.sql._
+
+    val aId = Columns.id.prefix("a")
+    val afileMeta = fileId.prefix("a")
+    val bPos = RAttachment.Columns.position.prefix("b")
+    val bId = RAttachment.Columns.id.prefix("b")
+    val bItem = RAttachment.Columns.itemId.prefix("b")
+    val mId       = RFileMeta.Columns.id.prefix("m")
+
+    val cols = all.map(_.prefix("a")) ++ RFileMeta.Columns.all.map(_.prefix("m"))
+    val from = table ++ fr"a INNER JOIN" ++
+      RFileMeta.table ++ fr"m ON" ++ afileMeta.is(mId) ++ fr"INNER JOIN" ++
+      RAttachment.table ++ fr"b ON" ++ aId.is(bId)
+    val where = bItem.is(id)
+
+    (selectSimple(cols, from, where) ++ orderBy(bPos.asc)).
+      query[(RAttachmentSource, FileMeta)].to[Vector]
+  }
 
 }