diff --git a/R/send_to_dai.R b/R/send_to_dai.R
index bee9400..2351d8d 100644
--- a/R/send_to_dai.R
+++ b/R/send_to_dai.R
@@ -96,7 +96,7 @@ dai_sync <- function(file,
     "skipHumanReview" = skip_rev,
     "rawDocument" = list(
       "content" = encoded_file,
-      "mimeType" = "image/tiff"
+      "mimeType" = "image/png"
     )
   )
 
diff --git a/R/utils.R b/R/utils.R
index b21820c..751626d 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -20,27 +20,25 @@
 #' # A vector of image files:
 #' image_to_pdf(images)
 #' }
-
 image_to_pdf <- function(files, pdf_name) {
-
   # checks
   if (!(is.vector(files))) {
     stop("'files' input not a vector.")
-    }
+  }
 
   if (!(is.character(files))) {
     stop("'files' input not a character vector.")
-    }
+  }
 
   if (!(grepl("\\.pdf$", pdf_name))) {
     stop("Destination filename not .pdf")
-    }
+  }
 
   # convert
   magick::image_write(magick::image_read(files),
-                      format = "pdf",
-                      pdf_name
-                      )
+    format = "pdf",
+    pdf_name
+  )
 }
 
 #' Check that a file is PDF
@@ -54,9 +52,7 @@ image_to_pdf <- function(files, pdf_name) {
 #' \dontrun{
 #' is_pdf("document.pdf")
 #' }
-
 is_pdf <- function(file) {
-
   result <- suppressMessages(try(pdftools::pdf_info(file), silent = TRUE))
 
   return(!(inherits(result, "try-error")))
@@ -73,13 +69,10 @@ is_pdf <- function(file) {
 #' \dontrun{
 #' is_json("file.json")
 #' }
-
 is_json <- function(file) {
-
   result <- suppressMessages(try(jsonlite::fromJSON(file), silent = TRUE))
 
   return(!(inherits(result, "try-error")))
-
 }
 
 #' Check that a string is a valid colour representation
@@ -94,13 +87,10 @@ is_json <- function(file) {
 #' is_colour("red")
 #' is_colour("#12345")
 #' }
-
 is_colour <- function(x) {
-
   result <- suppressMessages(try(grDevices::col2rgb(x), silent = TRUE))
 
   return(!(inherits(result, "try-error")))
-
 }
 
 #' PDF to base64 tiff
@@ -113,12 +103,10 @@ is_colour <- function(x) {
 #' \dontrun{
 #' doc_encoded <- pdf_to_binbase("document.pdf")
 #' }
-
 pdf_to_binbase <- function(file) {
-
   if (!(is_pdf(file))) {
     stop("Input file not a pdf.")
-    }
+  }
 
   img <- magick::image_read_pdf(file)
 
@@ -126,14 +114,12 @@ pdf_to_binbase <- function(file) {
 
   filepath <- file.path(tempdir(), "dai_temp.tiff")
 
-  magick::image_write(img_gray, 
-                      filepath, 
-                      format = "tiff"#, 
-                      #compression = "JPEG"
-                      )
+  magick::image_write(img_gray,
+    filepath,
+    format = "png"
+  )
 
   base64enc::base64encode(filepath)
-
 }
 
 #' Image to base64 tiff
@@ -146,12 +132,10 @@ pdf_to_binbase <- function(file) {
 #' \dontrun{
 #' img_encoded <- img_to_binbase("image.png")
 #' }
-
 img_to_binbase <- function(file) {
-
   if (is_pdf(file)) {
     stop("Input file is .pdf.")
-    }
+  }
 
   img <- magick::image_read(file)
 
@@ -159,12 +143,10 @@ img_to_binbase <- function(file) {
 
   filepath <- file.path(tempdir(), "dai_temp.tiff")
 
-  magick::image_write(img_gray, 
-                      filepath, 
-                      format = "tiff"#, 
-                      #compression = "JPEG"
-                      )
+  magick::image_write(img_gray,
+    filepath,
+    format = "png"
+  )
 
   base64enc::base64encode(filepath)
-
 }