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diff --git a/tools/store_screenshots.py b/tools/store_screenshots.py
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--- /dev/null
+++ b/tools/store_screenshots.py
@@ -0,0 +1,111 @@
+"""Turn raw phone screenshots into captioned store screenshots.
+
+    python tools/store_screenshots.py <folder with 01_home.png ... from `adb exec-out screencap -p`>
+
+Writes docs/store/screenshots/android/*.png (1080x1920, Google Play) and
+docs/store/screenshots/ios/*.png (1320x2868, App Store 6.9-inch). The Android status and
+navigation bars are cropped off, so the iOS set shows only the app. Screens marked
+android_only are left out of the iOS set.
+"""
+import pathlib
+import sys
+
+from PIL import Image, ImageDraw, ImageFilter, ImageFont
+
+ROOT = pathlib.Path(__file__).resolve().parent.parent
+OUT = ROOT / 'docs' / 'store' / 'screenshots'
+FONT_BOLD = 'C:/Windows/Fonts/segoeuib.ttf'
+FONT_SEMI = 'C:/Windows/Fonts/seguisb.ttf'
+
+GROUND = (11, 26, 20)
+EMBLEM = (31, 74, 46)
+SUN = (245, 179, 53)
+CREAM = (251, 247, 238)
+MUTED = (220, 229, 223)
+
+# file, headline, sub line, android_only
+SCREENS = [
+    ('01_home.png', 'Badaga songs from the Nilgiris', 'Free to listen, with no ads', False),
+    ('02_player.png', 'The music of home, anywhere', 'Background play and lock-screen controls', False),
+    ('03_album.png', 'Albums from Badaga singers', 'Download them and listen offline', False),
+    ('04_explore.png', 'Songs for every occasion', 'Weddings, festivals, devotional and more', False),
+    ('05_sound.png', 'Clear sound, even from old cassettes', 'Equalizer presets and volume boost', True),
+]
+
+# Phone is 1080x2340: status bar above, gesture/navigation bar below.
+CROP = (0, 110, 1080, 2215)
+
+
+def background(w, h):
+    img = Image.new('RGB', (w, h), GROUND)
+    glow = Image.new('RGB', (w, h), GROUND)
+    d = ImageDraw.Draw(glow)
+    d.ellipse((-w * 0.4, -h * 0.25, w * 1.4, h * 0.55), fill=EMBLEM)
+    return Image.blend(img, glow.filter(ImageFilter.GaussianBlur(w // 4)), 0.9)
+
+
+def wrap(draw, text, font, max_w):
+    words, lines, line = text.split(), [], ''
+    for word in words:
+        test = f'{line} {word}'.strip()
+        if draw.textlength(test, font=font) <= max_w:
+            line = test
+        else:
+            lines.append(line)
+            line = word
+    return lines + [line]
+
+
+def compose(shot, head, sub, w, h):
+    img = background(w, h)
+    d = ImageDraw.Draw(img)
+    margin = round(w * 0.08)
+    head_font = ImageFont.truetype(FONT_BOLD, round(w * 0.072))
+    sub_font = ImageFont.truetype(FONT_SEMI, round(w * 0.038))
+
+    y = round(h * 0.055)
+    d.rounded_rectangle((margin, y, margin + round(w * 0.09), y + round(w * 0.012)), radius=8, fill=SUN)
+    y += round(w * 0.05)
+    for line in wrap(d, head, head_font, w - 2 * margin):
+        d.text((margin, y), line, font=head_font, fill=CREAM)
+        y += round(head_font.size * 1.18)
+    y += round(w * 0.012)
+    d.text((margin, y), sub, font=sub_font, fill=MUTED)
+    y += round(sub_font.size * 2.8)
+
+    # Screenshot in a rounded phone-like frame, filling the rest of the height.
+    screen = shot.crop(CROP)
+    avail_h = h - y - round(h * 0.04)
+    scale = min(avail_h / screen.height, (w - 2 * margin) / screen.width)
+    sw, sh = round(screen.width * scale), round(screen.height * scale)
+    screen = screen.resize((sw, sh), Image.LANCZOS)
+    bezel = round(w * 0.014)
+    radius = round(w * 0.06)
+    x0 = (w - sw) // 2
+    shadow = Image.new('L', (w, h), 0)
+    ImageDraw.Draw(shadow).rounded_rectangle(
+        (x0 - bezel, y - bezel + 20, x0 + sw + bezel, y + sh + bezel + 20), radius=radius + bezel, fill=160)
+    img.paste((0, 0, 0), mask=shadow.filter(ImageFilter.GaussianBlur(30)))
+    d = ImageDraw.Draw(img)
+    d.rounded_rectangle((x0 - bezel, y - bezel, x0 + sw + bezel, y + sh + bezel),
+                        radius=radius + bezel, fill=(5, 13, 9), outline=(42, 69, 55), width=3)
+    mask = Image.new('L', (sw, sh), 0)
+    ImageDraw.Draw(mask).rounded_rectangle((0, 0, sw, sh), radius=radius, fill=255)
+    img.paste(screen, (x0, y), mask)
+    return img
+
+
+def main():
+    src = pathlib.Path(sys.argv[1])
+    for target, size in (('android', (1080, 1920)), ('ios', (1320, 2868))):
+        (OUT / target).mkdir(parents=True, exist_ok=True)
+        for name, head, sub, android_only in SCREENS:
+            if android_only and target == 'ios':
+                continue
+            shot = Image.open(src / name).convert('RGB')
+            compose(shot, head, sub, *size).save(OUT / target / name, optimize=True)
+        print(f'{target}: {sorted(p.name for p in (OUT / target).glob("*.png"))}')
+
+
+if __name__ == '__main__':
+    main()