diff --git a/modules/restserver/src/main/scala/docspell/restserver/http4s/BinaryUtil.scala b/modules/restserver/src/main/scala/docspell/restserver/http4s/BinaryUtil.scala
new file mode 100644
index 00000000..065f07cd
--- /dev/null
+++ b/modules/restserver/src/main/scala/docspell/restserver/http4s/BinaryUtil.scala
@@ -0,0 +1,54 @@
+package docspell.restserver.http4s
+
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.ops._
+
+import bitpeace.FileMeta
+import org.http4s._
+import org.http4s.circe.CirceEntityEncoder._
+import org.http4s.dsl.Http4sDsl
+import org.http4s.headers.ETag.EntityTag
+import org.http4s.headers._
+
+object BinaryUtil {
+
+  def withResponseHeaders[F[_]: Sync](dsl: Http4sDsl[F], resp: F[Response[F]])(
+      data: OItemSearch.BinaryData[F]
+  ): F[Response[F]] = {
+    import dsl._
+
+    val mt             = MediaType.unsafeParse(data.meta.mimetype.asString)
+    val ctype          = `Content-Type`(mt)
+    val cntLen: Header = `Content-Length`.unsafeFromLong(data.meta.length)
+    val eTag: Header   = ETag(data.meta.checksum)
+    val disp: Header =
+      `Content-Disposition`("inline", Map("filename" -> data.name.getOrElse("")))
+
+    resp.map(r =>
+      if (r.status == NotModified) r.withHeaders(ctype, eTag, disp)
+      else r.withHeaders(ctype, cntLen, eTag, disp)
+    )
+  }
+
+  def makeByteResp[F[_]: Sync](
+      dsl: Http4sDsl[F]
+  )(data: OItemSearch.BinaryData[F]): F[Response[F]] = {
+    import dsl._
+    withResponseHeaders(dsl, Ok(data.data.take(data.meta.length)))(data)
+  }
+
+  def matchETag[F[_]](
+      fileData: Option[FileMeta],
+      noneMatch: Option[NonEmptyList[EntityTag]]
+  ): Boolean =
+    (fileData, noneMatch) match {
+      case (Some(meta), Some(nm)) =>
+        meta.checksum == nm.head.tag
+      case _ =>
+        false
+    }
+
+}
diff --git a/modules/restserver/src/main/scala/docspell/restserver/routes/AttachmentRoutes.scala b/modules/restserver/src/main/scala/docspell/restserver/routes/AttachmentRoutes.scala
index bc500bdd..1d3ee301 100644
--- a/modules/restserver/src/main/scala/docspell/restserver/routes/AttachmentRoutes.scala
+++ b/modules/restserver/src/main/scala/docspell/restserver/routes/AttachmentRoutes.scala
@@ -1,6 +1,5 @@
 package docspell.restserver.routes
 
-import cats.data.NonEmptyList
 import cats.effect._
 import cats.implicits._
 
@@ -10,14 +9,13 @@ import docspell.backend.ops._
 import docspell.common.Ident
 import docspell.restapi.model._
 import docspell.restserver.conv.Conversions
+import docspell.restserver.http4s.BinaryUtil
 import docspell.restserver.webapp.Webjars
 
-import bitpeace.FileMeta
 import org.http4s._
 import org.http4s.circe.CirceEntityDecoder._
 import org.http4s.circe.CirceEntityEncoder._
 import org.http4s.dsl.Http4sDsl
-import org.http4s.headers.ETag.EntityTag
 import org.http4s.headers._
 
 object AttachmentRoutes {
@@ -26,24 +24,13 @@ object AttachmentRoutes {
     val dsl = new Http4sDsl[F] {}
     import dsl._
 
-    def withResponseHeaders(
-        resp: F[Response[F]]
-    )(data: OItemSearch.BinaryData[F]): F[Response[F]] = {
-      val mt             = MediaType.unsafeParse(data.meta.mimetype.asString)
-      val ctype          = `Content-Type`(mt)
-      val cntLen: Header = `Content-Length`.unsafeFromLong(data.meta.length)
-      val eTag: Header   = ETag(data.meta.checksum)
-      val disp: Header =
-        `Content-Disposition`("inline", Map("filename" -> data.name.getOrElse("")))
-
-      resp.map(r =>
-        if (r.status == NotModified) r.withHeaders(ctype, eTag, disp)
-        else r.withHeaders(ctype, cntLen, eTag, disp)
-      )
-    }
+    def withResponseHeaders(resp: F[Response[F]])(
+        data: OItemSearch.BinaryData[F]
+    ): F[Response[F]] =
+      BinaryUtil.withResponseHeaders[F](dsl, resp)(data)
 
     def makeByteResp(data: OItemSearch.BinaryData[F]): F[Response[F]] =
-      withResponseHeaders(Ok(data.data.take(data.meta.length)))(data)
+      BinaryUtil.makeByteResp(dsl)(data)
 
     HttpRoutes.of {
       case HEAD -> Root / Ident(id) =>
@@ -59,7 +46,7 @@ object AttachmentRoutes {
         for {
           fileData <- backend.itemSearch.findAttachment(id, user.account.collective)
           inm     = req.headers.get(`If-None-Match`).flatMap(_.tags)
-          matches = matchETag(fileData.map(_.meta), inm)
+          matches = BinaryUtil.matchETag(fileData.map(_.meta), inm)
           resp <-
             fileData
               .map { data =>
@@ -82,7 +69,7 @@ object AttachmentRoutes {
         for {
           fileData <- backend.itemSearch.findAttachmentSource(id, user.account.collective)
           inm     = req.headers.get(`If-None-Match`).flatMap(_.tags)
-          matches = matchETag(fileData.map(_.meta), inm)
+          matches = BinaryUtil.matchETag(fileData.map(_.meta), inm)
           resp <-
             fileData
               .map { data =>
@@ -107,7 +94,7 @@ object AttachmentRoutes {
           fileData <-
             backend.itemSearch.findAttachmentArchive(id, user.account.collective)
           inm     = req.headers.get(`If-None-Match`).flatMap(_.tags)
-          matches = matchETag(fileData.map(_.meta), inm)
+          matches = BinaryUtil.matchETag(fileData.map(_.meta), inm)
           resp <-
             fileData
               .map { data =>
@@ -122,7 +109,7 @@ object AttachmentRoutes {
           fileData <-
             backend.itemSearch.findAttachmentPreview(id, user.account.collective)
           inm     = req.headers.get(`If-None-Match`).flatMap(_.tags)
-          matches = matchETag(fileData.map(_.meta), inm)
+          matches = BinaryUtil.matchETag(fileData.map(_.meta), inm)
           resp <-
             fileData
               .map { data =>
@@ -173,16 +160,4 @@ object AttachmentRoutes {
         } yield resp
     }
   }
-
-  private def matchETag[F[_]](
-      fileData: Option[FileMeta],
-      noneMatch: Option[NonEmptyList[EntityTag]]
-  ): Boolean =
-    (fileData, noneMatch) match {
-      case (Some(meta), Some(nm)) =>
-        meta.checksum == nm.head.tag
-      case _ =>
-        false
-    }
-
 }