diff --git a/changedetectionio/processors/text_json_diff/processor.py b/changedetectionio/processors/text_json_diff/processor.py
index 7845c897..60ec7753 100644
--- a/changedetectionio/processors/text_json_diff/processor.py
+++ b/changedetectionio/processors/text_json_diff/processor.py
@@ -227,7 +227,7 @@ class ContentProcessor:
         """Convert CDATA/comments in RSS to usable text."""
         return cdata_in_document_to_text(html_content=content)
 
-    def preprocess_pdf(self, content, raw_content):
+    def preprocess_pdf(self, raw_content):
         """Convert PDF to HTML using external tool."""
         from shutil import which
         tool = os.getenv("PDF_TO_HTML_TOOL", "pdftohtml")
@@ -251,7 +251,7 @@ class ContentProcessor:
         metadata = (
             f"<p>Added by changedetection.io: Document checksum - "
             f"{hashlib.md5(raw_content).hexdigest().upper()} "
-            f"Filesize - {len(html_content)} bytes</p>"
+            f"Original file size - {len(raw_content)} bytes</p>"
         )
         return html_content.replace('</body>', metadata + '</body>')
 
@@ -384,7 +384,8 @@ class perform_site_check(difference_detection_processor):
 
         # PDF preprocessing
         if watch.is_pdf or stream_content_type.is_pdf:
-            content = content_processor.preprocess_pdf(content, self.fetcher.raw_content)
+            content = content_processor.preprocess_pdf(raw_content=self.fetcher.raw_content)
+            stream_content_type.is_html = True
 
         # JSON preprocessing
         if stream_content_type.is_json:
@@ -414,6 +415,9 @@ class perform_site_check(difference_detection_processor):
         if watch.is_source_type_url:
             # For source URLs, keep raw content
             stripped_text = html_content
+        elif stream_content_type.is_plaintext:
+            # For plaintext, keep as-is without HTML-to-text conversion
+            stripped_text = html_content
         else:
             # Extract text from HTML/RSS content (not generic XML)
             if stream_content_type.is_html or stream_content_type.is_rss:
diff --git a/changedetectionio/tests/test_pdf.py b/changedetectionio/tests/test_pdf.py
index 74858cfa..64212bae 100644
--- a/changedetectionio/tests/test_pdf.py
+++ b/changedetectionio/tests/test_pdf.py
@@ -8,25 +8,30 @@ from .util import set_original_response, set_modified_response, live_server_setu
 # `subtractive_selectors` should still work in `source:` type requests
 def test_fetch_pdf(client, live_server, measure_memory_usage):
     import shutil
-    shutil.copy("tests/test.pdf", "test-datastore/endpoint-test.pdf")
+    import os
+
+    shutil.copy("tests/test.pdf", "test-datastore/endpoint-test.pdf")
+    first_version_size = os.path.getsize("test-datastore/endpoint-test.pdf")
 
-   #  live_server_setup(live_server) # Setup on conftest per function
     test_url = url_for('test_pdf_endpoint', _external=True)
-    # Add our URL to the import page
     uuid = client.application.config.get('DATASTORE').add_watch(url=test_url)
     client.get(url_for("ui.form_watch_checknow"), follow_redirects=True)
 
-
     wait_for_all_checks(client)
 
-    res = client.get(
-        url_for("ui.ui_views.preview_page", uuid="first"),
-        follow_redirects=True
-    )
+    watch = live_server.app.config['DATASTORE'].data['watching'][uuid]
+    dates = list(watch.history.keys())
+    snapshot_contents = watch.get_history_snapshot(dates[0])
 
     # PDF header should not be there (it was converted to text)
-    assert b'PDF' not in res.data[:10]
-    assert b'hello world' in res.data
+    assert 'PDF' not in snapshot_contents
+    # Was converted away from HTML
+    assert 'pdftohtml' not in snapshot_contents.lower() # Generator tag shouldnt be there
+    assert f'Original file size - {first_version_size}' in snapshot_contents
+    assert 'html' not in snapshot_contents.lower() # is converted from html
+    assert 'body' not in snapshot_contents.lower()  # is converted from html
+    # And our text content was there
+    assert 'hello world' in snapshot_contents
 
     # So we know if the file changes in other ways
     import hashlib
@@ -34,8 +39,7 @@ def test_fetch_pdf(client, live_server, measure_memory_usage):
     # We should have one
     assert len(original_md5) >0
     # And it's going to be in the document
-    assert b'Document checksum - '+bytes(str(original_md5).encode('utf-8')) in res.data
-
+    assert f'Document checksum - {original_md5}' in snapshot_contents
 
     shutil.copy("tests/test2.pdf", "test-datastore/endpoint-test.pdf")
     changed_md5 = hashlib.md5(open("test-datastore/endpoint-test.pdf", 'rb').read()).hexdigest().upper()
@@ -58,7 +62,6 @@ def test_fetch_pdf(client, live_server, measure_memory_usage):
     assert original_md5.encode('utf-8') not in res.data
     assert changed_md5.encode('utf-8') in res.data
 
-
     res = client.get(
         url_for("ui.ui_views.diff_history_page", uuid="first"),
         follow_redirects=True
@@ -66,6 +69,16 @@ def test_fetch_pdf(client, live_server, measure_memory_usage):
 
     assert original_md5.encode('utf-8') in res.data
     assert changed_md5.encode('utf-8') in res.data
-
     assert b'here is a change' in res.data
+
+
+    dates = list(watch.history.keys())
+    # new snapshot was also OK, no HTML
+    snapshot_contents = watch.get_history_snapshot(dates[1])
+    assert 'html' not in snapshot_contents.lower()
+    assert f'Original file size - {os.path.getsize("test-datastore/endpoint-test.pdf")}' in snapshot_contents
+    assert f'here is a change' in snapshot_contents
+    assert os.path.getsize("test-datastore/endpoint-test.pdf") != first_version_size # And the disk change worked
+
+
     
\ No newline at end of file