diff --git a/DocumentSpecs.py b/DocumentSpecs.py
index 4eff801..f35183d 100644
--- a/DocumentSpecs.py
+++ b/DocumentSpecs.py
@@ -11,6 +11,9 @@ class DocumentSpecs(BaseModel):
     fontsize: int
     paperwidth: int
     paperheight: int
+    ratio: int
     margin: int
     vmargin: int
     extension: str
+    fps: int
+    stilltime: int
diff --git a/FormatParameters.py b/FormatParameters.py
index f221f95..478156a 100644
--- a/FormatParameters.py
+++ b/FormatParameters.py
@@ -8,6 +8,9 @@ class FormatParameters(BaseModel):
     fontsize: int
     paperwidth: int
     paperheight: int
+    ratio: int
     margin: int
     vmargin: int
     extension: str
+    fps: int
+    stilltime: int
diff --git a/convert_pdf.py b/convert_pdf.py
index 453d408..dba89cd 100644
--- a/convert_pdf.py
+++ b/convert_pdf.py
@@ -21,7 +21,7 @@ def convert_pdf(filename, filetype, output_path, resolution=300):
             img.alpha_channel = 'remove'
 
             image_filename = os.path.splitext(os.path.basename(filename))[0]
-            image_filename = f'{image_filename}-{i}.{filetype}'
+            image_filename = f'{image_filename}-{i:03}.{filetype}'
             image_filename = os.path.join(output_path, image_filename)
 
             img.save(filename=image_filename)