diff --git a/docs_assets/logos/amberelec.png b/docs_assets/logos/amberelec.png
deleted file mode 100644
index ddc713f4..00000000
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diff --git a/docs_assets/logos/amberelec.webp b/docs_assets/logos/amberelec.webp
new file mode 100644
index 00000000..f5176139
Binary files /dev/null and b/docs_assets/logos/amberelec.webp differ
diff --git a/docs_assets/logos/bizhawk.png b/docs_assets/logos/bizhawk.png
deleted file mode 100644
index 511597b2..00000000
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diff --git a/docs_assets/logos/bizhawk.webp b/docs_assets/logos/bizhawk.webp
new file mode 100644
index 00000000..da5ad034
Binary files /dev/null and b/docs_assets/logos/bizhawk.webp differ
diff --git a/docs_assets/logos/emudeck.png b/docs_assets/logos/emudeck.png
deleted file mode 100644
index 408a9415..00000000
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diff --git a/docs_assets/logos/emudeck.webp b/docs_assets/logos/emudeck.webp
new file mode 100644
index 00000000..011379cf
Binary files /dev/null and b/docs_assets/logos/emudeck.webp differ
diff --git a/docs_assets/logos/emuelec.png b/docs_assets/logos/emuelec.png
deleted file mode 100644
index 1c432fc5..00000000
Binary files a/docs_assets/logos/emuelec.png and /dev/null differ
diff --git a/docs_assets/logos/emuelec.webp b/docs_assets/logos/emuelec.webp
new file mode 100644
index 00000000..1201668d
Binary files /dev/null and b/docs_assets/logos/emuelec.webp differ
diff --git a/docs_assets/logos/knulli.png b/docs_assets/logos/knulli.png
deleted file mode 100644
index fc8885f1..00000000
Binary files a/docs_assets/logos/knulli.png and /dev/null differ
diff --git a/docs_assets/logos/knulli.webp b/docs_assets/logos/knulli.webp
new file mode 100644
index 00000000..82c85999
Binary files /dev/null and b/docs_assets/logos/knulli.webp differ
diff --git a/docs_assets/logos/minui.png b/docs_assets/logos/minui.png
deleted file mode 100644
index cc59063a..00000000
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diff --git a/docs_assets/logos/minui.webp b/docs_assets/logos/minui.webp
new file mode 100644
index 00000000..94ea7981
Binary files /dev/null and b/docs_assets/logos/minui.webp differ
diff --git a/docs_assets/logos/misterfpga.png b/docs_assets/logos/misterfpga.png
deleted file mode 100644
index 35821644..00000000
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diff --git a/docs_assets/logos/misterfpga.webp b/docs_assets/logos/misterfpga.webp
new file mode 100644
index 00000000..45c44e4a
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diff --git a/docs_assets/logos/nextui.png b/docs_assets/logos/nextui.png
deleted file mode 100644
index dd758331..00000000
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diff --git a/docs_assets/logos/nextui.webp b/docs_assets/logos/nextui.webp
new file mode 100644
index 00000000..8c5968a0
Binary files /dev/null and b/docs_assets/logos/nextui.webp differ
diff --git a/docs_assets/logos/retrobat.png b/docs_assets/logos/retrobat.png
deleted file mode 100644
index 2b4395ac..00000000
Binary files a/docs_assets/logos/retrobat.png and /dev/null differ
diff --git a/docs_assets/logos/retrobat.webp b/docs_assets/logos/retrobat.webp
new file mode 100644
index 00000000..b086f4f6
Binary files /dev/null and b/docs_assets/logos/retrobat.webp differ
diff --git a/docs_assets/logos/retropie.png b/docs_assets/logos/retropie.png
deleted file mode 100644
index e3885625..00000000
Binary files a/docs_assets/logos/retropie.png and /dev/null differ
diff --git a/docs_assets/logos/retropie.webp b/docs_assets/logos/retropie.webp
new file mode 100644
index 00000000..70328f9b
Binary files /dev/null and b/docs_assets/logos/retropie.webp differ
diff --git a/docs_assets/logos/rocknix.png b/docs_assets/logos/rocknix.png
deleted file mode 100644
index 8158615d..00000000
Binary files a/docs_assets/logos/rocknix.png and /dev/null differ
diff --git a/docs_assets/logos/rocknix.webp b/docs_assets/logos/rocknix.webp
new file mode 100644
index 00000000..b75370ee
Binary files /dev/null and b/docs_assets/logos/rocknix.webp differ
diff --git a/docs_assets/logos/romm.png b/docs_assets/logos/romm.png
deleted file mode 100644
index 71d38413..00000000
Binary files a/docs_assets/logos/romm.png and /dev/null differ
diff --git a/docs_assets/logos/romm.webp b/docs_assets/logos/romm.webp
new file mode 100644
index 00000000..0a2fafaf
Binary files /dev/null and b/docs_assets/logos/romm.webp differ
diff --git a/docs_assets/logos/sources.json b/docs_assets/logos/sources.json
index 590c551d..c5a3f527 100644
--- a/docs_assets/logos/sources.json
+++ b/docs_assets/logos/sources.json
@@ -2,7 +2,7 @@
   "note": "Each platform's own logo, owned by its project and shown only to name that platform. Copied once by scripts/fetch_site_images.py.",
   "images": [
     {
-      "file": "amberelec.png",
+      "file": "amberelec.webp",
       "platform": "amberelec",
       "source": "https://avatars.githubusercontent.com/u/102820909",
       "owner": "AmberELEC",
@@ -16,28 +16,28 @@
       "licence": "repository licence MIT"
     },
     {
-      "file": "bizhawk.png",
+      "file": "bizhawk.webp",
       "platform": "bizhawk",
       "source": "https://avatars.githubusercontent.com/u/11743303",
       "owner": "TASVideos",
       "licence": "GitHub organisation avatar of TASEmulators"
     },
     {
-      "file": "emudeck.png",
+      "file": "emudeck.webp",
       "platform": "emudeck",
       "source": "https://raw.githubusercontent.com/dragoonDorise/EmuDeck/main/icons/EmuDeck.png",
       "owner": "EmuDeck",
       "licence": "repository licence GPL-3.0"
     },
     {
-      "file": "emuelec.png",
+      "file": "emuelec.webp",
       "platform": "emuelec",
       "source": "https://avatars.githubusercontent.com/u/57574835",
       "owner": "EmuELEC",
       "licence": "GitHub organisation avatar of EmuELEC"
     },
     {
-      "file": "knulli.png",
+      "file": "knulli.webp",
       "platform": "knulli",
       "source": "https://avatars.githubusercontent.com/u/166268572",
       "owner": "KNULLI",
@@ -51,21 +51,21 @@
       "licence": "file from libretro/retroarch-assets, CC-BY-4.0"
     },
     {
-      "file": "minui.png",
+      "file": "minui.webp",
       "platform": "minui",
       "source": "https://avatars.githubusercontent.com/u/225589",
       "owner": "Shaun Inman",
       "licence": "GitHub avatar of shauninman, the author of MinUI"
     },
     {
-      "file": "misterfpga.png",
+      "file": "misterfpga.webp",
       "platform": "misterfpga",
       "source": "https://avatars.githubusercontent.com/u/29345272",
       "owner": "MiSTer FPGA",
       "licence": "GitHub organisation avatar of MiSTer-devel"
     },
     {
-      "file": "nextui.png",
+      "file": "nextui.webp",
       "platform": "nextui",
       "source": "https://avatars.githubusercontent.com/u/202386615",
       "owner": "LoveRetro",
@@ -86,7 +86,7 @@
       "licence": "repository licence GPL-3.0"
     },
     {
-      "file": "retrobat.png",
+      "file": "retrobat.webp",
       "platform": "retrobat",
       "source": "https://raw.githubusercontent.com/RetroBat-Official/retrobat/main/system/resources/retrobat_logo_notext.png",
       "owner": "RetroBat",
@@ -100,21 +100,21 @@
       "licence": "repository licence GPL-3.0"
     },
     {
-      "file": "retropie.png",
+      "file": "retropie.webp",
       "platform": "retropie",
       "source": "https://avatars.githubusercontent.com/u/11378204",
       "owner": "RetroPie",
       "licence": "GitHub organisation avatar of RetroPie"
     },
     {
-      "file": "rocknix.png",
+      "file": "rocknix.webp",
       "platform": "rocknix",
       "source": "https://avatars.githubusercontent.com/u/163176886",
       "owner": "ROCKNIX",
       "licence": "GitHub organisation avatar of ROCKNIX"
     },
     {
-      "file": "romm.png",
+      "file": "romm.webp",
       "platform": "romm",
       "source": "https://avatars.githubusercontent.com/u/164058018",
       "owner": "RomM",
diff --git a/scripts/fetch_site_images.py b/scripts/fetch_site_images.py
index 49ae239b..783f911c 100644
--- a/scripts/fetch_site_images.py
+++ b/scripts/fetch_site_images.py
@@ -8,8 +8,9 @@ into ``docs_assets/logos/`` and ``docs_assets/system-icons/``, which are
 committed, and records where each came from in a ``sources.json`` beside
 them. The site build only reads those copies (``sitediagrams.localize_images``).
 
-Raster images are normalised to a square PNG (96 px for logos, 48 px for
-system icons) so every tile has the same weight, and SVG is kept as published.
+Raster logos are normalised to an 80 px square WebP, twice the 40 px they
+are shown at, and system icons to a 48 px PNG, so every tile has the same
+weight. SVG is kept as published.
 Normalising needs Pillow. This is a maintenance tool run by hand when a
 logo changes, not a build step: the build stays on the standard library
 and PyYAML.
@@ -36,7 +37,7 @@ sys.path.insert(0, str(ROOT / "scripts"))
 
 LOGO_DIR = ROOT / "docs_assets" / "logos"
 ICON_DIR = ROOT / "docs_assets" / "system-icons"
-LOGO_SIZE = 96
+LOGO_SIZE = 80
 ICON_SIZE = 48
 AVATAR_HOST = "avatars.githubusercontent.com"
 USER_AGENT = "retrobios-site-images"
@@ -47,7 +48,7 @@ def fetch(url: str) -> bytes:
         return response.read()
 
 
-def square_png(data: bytes, size: int) -> bytes:
+def square_image(data: bytes, size: int, kind: str = "PNG") -> bytes:
     try:
         from PIL import Image
     except ImportError as exc:
@@ -57,7 +58,11 @@ def square_png(data: bytes, size: int) -> bytes:
     tile = Image.new("RGBA", (size, size), (0, 0, 0, 0))
     tile.paste(image, ((size - image.width) // 2, (size - image.height) // 2), image)
     out = io.BytesIO()
-    tile.save(out, "PNG", optimize=True)
+    if kind == "WEBP":
+        # Quality 90: half the bytes of lossless, edges still clean at 40 px.
+        tile.save(out, "WEBP", quality=90, method=6)
+    else:
+        tile.save(out, "PNG", optimize=True)
     return out.getvalue()
 
 
@@ -98,7 +103,7 @@ def fetch_logos() -> None:
         if is_svg(data):
             file_name, payload = f"{name}.svg", safe_svg(data, url)
         else:
-            file_name, payload = f"{name}.png", square_png(data, LOGO_SIZE)
+            file_name, payload = f"{name}.webp", square_image(data, LOGO_SIZE, "WEBP")
         for stale in LOGO_DIR.glob(f"{name}.*"):
             if stale.name != file_name:
                 stale.unlink()
@@ -141,7 +146,7 @@ def fetch_icons() -> None:
                 continue
             raise
         file_name = f"{name}.png"
-        (ICON_DIR / file_name).write_bytes(square_png(data, ICON_SIZE))
+        (ICON_DIR / file_name).write_bytes(square_image(data, ICON_SIZE))
         entries.append({"file": file_name, "source": url})
         print(f"  {file_name}")
     write_manifest(