Small script to add simple subtitles to images generated in A1111

Goes in A111\webui\scripts

(full code)

# add_subtitle.py - Reliable per-image subtitle overlay with collapsed accordion UI

import modules.scripts as scripts

from PIL import Image, ImageDraw, ImageFont

import textwrap

class AddSubtitleScript(scripts.Script):

def title(self):

return "Add Subtitle Overlay"

def show(self, is_img2img):

return scripts.AlwaysVisible

def ui(self, is_img2img):

import gradio as gr

with gr.Accordion("Subtitle Overlay (click to expand)", open=False):

subtitle_text = gr.Textbox(

label="Subtitle Text",

placeholder="Enter text to overlay at bottom (leave blank to skip)",

lines=2

)

font_size = gr.Slider(

minimum=20,

maximum=120,

value=48,

step=1,

label="Font Size (px)"

)

margin_bottom = gr.Slider(

minimum=20,

maximum=300,

value=60,

step=10,

label="Bottom Margin (px)"

)

return [subtitle_text, font_size, margin_bottom]

def postprocess_image(self, p, pp, subtitle_text, font_size, margin_bottom):

if not subtitle_text or not subtitle_text.strip():

return # Skip if no text entered

img = pp.image # PIL Image to modify in-place

draw = ImageDraw.Draw(img)

font_path = None # Optional: change to full path e.g. "C:/Windows/Fonts/arial.ttf"

text_color = "white"

outline_color = "black"

outline_width = 3

try:

font = ImageFont.truetype(font_path or "arial.ttf", int(font_size))

except Exception:

font = ImageFont.load_default()

print("Warning: Falling back to default font (small/low quality)")

# Word wrapping for long subtitles

wrapped_lines = textwrap.wrap(subtitle_text, width=50) # adjust width as needed

# Calculate total height and starting y position

line_heights = []

for line in wrapped_lines:

bbox = draw.textbbox((0, 0), line, font=font)

line_heights.append(bbox[3] - bbox[1])

total_text_height = sum(line_heights) + (len(wrapped_lines) - 1) * 8 # spacing

y = img.height - total_text_height - int(margin_bottom)

for idx, line in enumerate(wrapped_lines):

bbox = draw.textbbox((0, 0), line, font=font)

text_w = bbox[2] - bbox[0]

x = (img.width - text_w) // 2 # centered

# Draw outline

for dx in [-outline_width, 0, outline_width]:

for dy in [-outline_width, 0, outline_width]:

if dx != 0 or dy != 0:

draw.text((x + dx, y + dy), line, font=font, fill=outline_color)

# Main text

draw.text((x, y), line, font=font, fill=text_color)

y += line_heights[idx] + 8 # next line

# Changes are applied in-place to pp.image → will be used/saved by A1111