Update app.py

app.py

@@ -552,10 +552,22 @@ def _render_preview(otf_path, font_name):
     try:
         from PIL import Image, ImageDraw, ImageFont
         sample = f"{font_name}\nAa Bb Cc 123\nThe quick brown fox jumps over the lazy dog."
-        img = Image.new("RGB", (1700, 620), "white")
+        font_size = 180
+        spacing = 36
+        pad = 70
+        font = ImageFont.truetype(otf_path, font_size)
+
+        # measure first on a throwaway canvas so the text never clips
+        meas = ImageDraw.Draw(Image.new("RGB", (10, 10)))
+        bbox = meas.multiline_textbbox((0, 0), sample, font=font, spacing=spacing)
+        w = (bbox[2] - bbox[0]) + pad * 2
+        h = (bbox[3] - bbox[1]) + pad * 2
+
+        img = Image.new("RGB", (w, h), "white")
         draw = ImageDraw.Draw(img)
-        font = ImageFont.truetype(otf_path, 150)
-        draw.multiline_text((90, 80), sample, font=font, fill="black", spacing=30)
+        # offset by bbox origin (handles negative side-bearings / descenders)
+        draw.multiline_text((pad - bbox[0], pad - bbox[1]),
+                            sample, font=font, fill="black", spacing=spacing)
         return img
     except Exception as e:
         print(f"⚠️ Preview failed: {e}")