diff --git a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/networking/ReadingProgressMutations.kt b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/networking/ReadingProgressMutations.kt
index f6670efe3..b3f7419ca 100644
--- a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/networking/ReadingProgressMutations.kt
+++ b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/networking/ReadingProgressMutations.kt
@@ -19,8 +19,13 @@ data class ReadingProgressParams(
   )
 }
 
-suspend fun Networker.updateReadingProgress(jsonString: String): Boolean {
-  val input = Gson().fromJson(jsonString, ReadingProgressParams::class.java).asSaveReadingProgressInput()
+suspend fun Networker.updateWebReadingProgress(jsonString: String): Boolean {
+  val params = Gson().fromJson(jsonString, ReadingProgressParams::class.java)
+  return updateReadingProgress(params)
+}
+
+suspend fun Networker.updateReadingProgress(params: ReadingProgressParams): Boolean {
+  val input = params.asSaveReadingProgressInput()
 
   Log.d("Loggo", "created reading progress input: $input")
 
diff --git a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReader.kt b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReader.kt
index 5fd2755b1..2233ec4dc 100644
--- a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReader.kt
+++ b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReader.kt
@@ -260,6 +260,11 @@ class PDFReaderActivity: AppCompatActivity(), DocumentListener, TextSelectionMan
     return super.onPageClick(document, pageIndex, event, pagePosition, clickedAnnotation)
   }
 
+  override fun onPageChanged(document: PdfDocument, pageIndex: Int) {
+    viewModel.syncPageChange(pageIndex, document.pageCount)
+    super.onPageChanged(document, pageIndex)
+  }
+
   private fun showHighlightSelectionPopover(clickedAnnotation: Annotation) {
     // TODO: anchor popover at exact position of tap (maybe add an empty view at tap loc and anchor to that?)
     val popupMenu = PopupMenu(this, fragment.view, Gravity.CENTER, androidx.appcompat.R.attr.actionOverflowMenuStyle, 0)
diff --git a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReaderViewModel.kt b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReaderViewModel.kt
index 0fb7f630b..20affa1f0 100644
--- a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReaderViewModel.kt
+++ b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/PDFReaderViewModel.kt
@@ -22,6 +22,8 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
 import org.json.JSONObject
 import java.io.File
+import java.lang.Double.max
+import java.lang.Double.min
 import java.util.*
 import javax.inject.Inject
 
@@ -38,6 +40,7 @@ class PDFReaderViewModel @Inject constructor(
 ): ViewModel() {
   var annotationUnderNoteEdit: Annotation? = null
   val pdfReaderParamsLiveData = MutableLiveData<PDFReaderParams?>(null)
+  private var currentReadingProgress = 0.0
 
   fun loadItem(slug: String, context: Context) {
     viewModelScope.launch {
@@ -66,6 +69,7 @@ class PDFReaderViewModel @Inject constructor(
             labelsJSONString = Gson().toJson(articleQueryResult.labels)
           )
 
+          currentReadingProgress = article.readingProgress
           pdfReaderParamsLiveData.postValue(PDFReaderParams(article, articleContent, Uri.fromFile(output)))
         }
 
@@ -80,6 +84,22 @@ class PDFReaderViewModel @Inject constructor(
     pdfReaderParamsLiveData.postValue(null)
   }
 
+  fun syncPageChange(currentPageIndex: Int, totalPages: Int) {
+    val rawProgress = ((currentPageIndex + 1).toDouble() / totalPages.toDouble()) * 100
+    val percent = min(100.0, max(0.0, rawProgress))
+    if (percent > currentReadingProgress) {
+      currentReadingProgress = percent
+      viewModelScope.launch {
+        val params = ReadingProgressParams(
+          id = pdfReaderParamsLiveData.value?.item?.id,
+          readingProgressPercent = percent,
+          readingProgressAnchorIndex = currentPageIndex
+        )
+        networker.updateReadingProgress(params)
+      }
+    }
+  }
+
   fun syncHighlightUpdates(newAnnotation: Annotation, quote: String, overlapIds: List<String>) {
     val itemID = pdfReaderParamsLiveData.value?.item?.id ?: return
     val highlightID = UUID.randomUUID().toString()
diff --git a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/WebReaderViewModel.kt b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/WebReaderViewModel.kt
index c30c036ff..7bec12af3 100644
--- a/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/WebReaderViewModel.kt
+++ b/android/Omnivore/app/src/main/java/app/omnivore/omnivore/ui/reader/WebReaderViewModel.kt
@@ -75,7 +75,7 @@ class WebReaderViewModel @Inject constructor(
       }
       "articleReadingProgress" -> {
         viewModelScope.launch {
-          val isReadingProgressSynced = networker.updateReadingProgress(jsonString)
+          val isReadingProgressSynced = networker.updateWebReadingProgress(jsonString)
           Log.d("Network", "isReadingProgressSynced = $isReadingProgressSynced")
         }
       }