diff --git a/components/frontend/src/lib/components/layout/AppFooter.svelte b/components/frontend/src/lib/components/layout/AppFooter.svelte
index 30f95426..76deb9a2 100644
--- a/components/frontend/src/lib/components/layout/AppFooter.svelte
+++ b/components/frontend/src/lib/components/layout/AppFooter.svelte
@@ -115,52 +115,37 @@
 
         <!-- The institutions behind SDSC, in the order and the bare form
              datascience.ch's own footer presents them: EPFL, ETH, PSI, Biopôle,
-             with no label in front. The label here used to read "A joint venture
-             of", which was true of ETH and EPFL but became a claim about PSI and
-             Biopôle once they joined the row. Dropping it is what the official
-             site does, and it makes the row state an affiliation rather than a
-             legal relationship.
-
-             Sizing and light/dark handling is per-logo below, because the assets
-             do not share a treatment. -->
+             with no label in front.
+
+             All four are monochrome white artwork inverted for light mode — one
+             asset and one rule each, which is the point of doing it this way.
+             Colour needed a second asset per mode and produced a bug every
+             time: EPFL's red could not be inverted at all, Biopôle's green
+             inverted to purple, and Richemont's navy vanished against the dark
+             canvas. Keep any replacement asset white-on-transparent.
+
+             Heights differ because a shared box height is not a shared apparent
+             size. Measured against EPFL's cap height, PSI's lettering fills 48%
+             of its asset and Biopôle's 55%, the rest being their graphic marks —
+             so h-5 for those two against h-4 for the two bare wordmarks. -->
         <div class="flex flex-wrap items-center gap-x-8 gap-y-4 pb-10">
             <a href="https://epfl.ch" target="_blank" rel="noopener noreferrer" class={LOGO_LINK}>
-                <!-- EPFL in its own red, so no `invert`: the rule its
-                     neighbours rely on turns red into cyan. The asset is the
-                     same paths as epfl.svg with the fill swapped. -->
-                <img src="/images/logos/epfl-red.svg" alt="EPFL" class="h-4" />
+                <img src="/images/logos/epfl.svg" alt="EPFL" class="h-4 invert dark:invert-0" />
             </a>
             <a href="https://ethz.ch" target="_blank" rel="noopener noreferrer" class={LOGO_LINK}>
-                <!-- Pure white paths, so the CSS invert is a real asset swap
-                     here — the only logo in the row it still works for. -->
                 <img
                     src="/images/logos/eth-zurich.svg"
                     alt="ETH Zurich"
                     class="h-4 invert dark:invert-0"
                 />
             </a>
-            <!-- PSI and Biopôle ship as light/dark pairs rather than through the
-                 `invert` above. Both were supplied drawn for a dark background,
-                 and `invert` flips hue as well as luminance: it turned Biopôle's
-                 green (#90c000) into purple. The light-mode asset instead has
-                 its luminance flipped only where the artwork is achromatic, so
-                 the type reverses and the green survives.
-
-                 `h-6`, not the `h-4` of the two wordmarks beside them: a shared
-                 box height is not a shared apparent size. EPFL's ink IS its cap
-                 height, while PSI's lettering fills only 59% of its asset (the
-                 sphere is twice as tall as the letters) and Biopôle's 53% (it is
-                 lowercase, with ascenders and an accent above the x-height). At
-                 a common `h-4` their type rendered around half the size of
-                 EPFL's, which is what datascience.ch's own footer does not do. -->
             <a
                 href="https://www.psi.ch/en"
                 target="_blank"
                 rel="noopener noreferrer"
                 class={LOGO_LINK}
             >
-                <img src="/images/logos/psi.png" alt="PSI" class="block h-6 dark:hidden" />
-                <img src="/images/logos/psi-white.png" alt="PSI" class="hidden h-6 dark:block" />
+                <img src="/images/logos/psi.png" alt="PSI" class="h-5 invert dark:invert-0" />
             </a>
             <a
                 href="https://www.biopole.ch/"
@@ -168,11 +153,10 @@
                 rel="noopener noreferrer"
                 class={LOGO_LINK}
             >
-                <img src="/images/logos/biopole.png" alt="Biopole" class="block h-6 dark:hidden" />
                 <img
-                    src="/images/logos/biopole-white.png"
-                    alt="Biopole"
-                    class="hidden h-6 dark:block"
+                    src="/images/logos/biopole.webp"
+                    alt="Biopôle"
+                    class="h-5 invert dark:invert-0"
                 />
             </a>
         </div>
diff --git a/components/frontend/static/images/logos/biopole-white.png b/components/frontend/static/images/logos/biopole-white.png
deleted file mode 100644
index 8161ded8..00000000
--- a/components/frontend/static/images/logos/biopole-white.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6886317a25a3e75cea0c6a84c4612da5902b34aaae4a9b608c6b42a429834f57
-size 5464
diff --git a/components/frontend/static/images/logos/biopole.png b/components/frontend/static/images/logos/biopole.png
deleted file mode 100644
index aff58338..00000000
--- a/components/frontend/static/images/logos/biopole.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:0ddebd1eb7f2b875b83ce593a0f45498fdf71a7592e541e4e55c1a4841425498
-size 5532
diff --git a/components/frontend/static/images/logos/biopole.webp b/components/frontend/static/images/logos/biopole.webp
new file mode 100644
index 00000000..8adbb92d
Binary files /dev/null and b/components/frontend/static/images/logos/biopole.webp differ
diff --git a/components/frontend/static/images/logos/biopole_logo.png b/components/frontend/static/images/logos/biopole_logo.png
deleted file mode 100644
index 0f6002b5..00000000
--- a/components/frontend/static/images/logos/biopole_logo.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:beda4060e3f584adff486e19e803df68e3cd22adcd756d82ea66c8755dc9296d
-size 5411
diff --git a/components/frontend/static/images/logos/epfl-red.svg b/components/frontend/static/images/logos/epfl-red.svg
deleted file mode 100644
index b9ebe668..00000000
--- a/components/frontend/static/images/logos/epfl-red.svg
+++ /dev/null
@@ -1,17 +0,0 @@
-<svg width="86" height="25" viewBox="0 0 86 25" fill="none" xmlns="http://www.w3.org/2000/svg">
-<g clip-path="url(#clip0_1842_2)">
-<path d="M0 10.1884H5.35068V4.62146H17.9459V0H0V10.1884Z" fill="#FF0000"/>
-<path d="M0 25H17.9459V20.3786H5.35068V14.8116H0V25Z" fill="#FF0000"/>
-<path d="M16.8695 10.1884H5.35071V14.8098H16.8695V10.1884Z" fill="#FF0000"/>
-<path d="M40.2325 2.29662C39.5481 1.60693 38.6625 1.05129 37.5738 0.631482C36.4851 0.21167 35.1636 0 33.6128 0H22.5299V25H27.8806V14.8098H33.6128C35.1636 14.8098 36.4851 14.5999 37.5738 14.1801C38.6625 13.7603 39.5481 13.2047 40.2325 12.515C40.9151 11.8253 41.4139 11.0333 41.7272 10.139C42.0406 9.24469 42.1963 8.33451 42.1963 7.40669C42.1963 6.47887 42.0406 5.54223 41.7272 4.65851C41.4139 3.77478 40.9169 2.98808 40.2325 2.29838V2.29662ZM36.5148 8.83723C36.2488 9.20059 35.8952 9.48282 35.4559 9.68214C35.0148 9.88146 34.5055 10.0155 33.9279 10.0861C33.3485 10.1549 32.7464 10.1902 32.1216 10.1902H27.8823V4.62323H32.1216C32.7464 4.62323 33.3485 4.65851 33.9279 4.7273C34.5072 4.79609 35.0166 4.93191 35.4559 5.13124C35.8952 5.33056 36.2488 5.61279 36.5148 5.97615C36.7809 6.33952 36.9139 6.81754 36.9139 7.40669C36.9139 7.99584 36.7809 8.47386 36.5148 8.83723Z" fill="#FF0000"/>
-<path d="M72.7706 20.3785V0H67.4199V25H85.3658V20.3785H72.7706Z" fill="#FF0000"/>
-<path d="M45.6007 10.1884H50.9514V4.62146H63.5466V0H45.6007V10.1884Z" fill="#FF0000"/>
-<path d="M50.9514 14.8116H45.6007V25H50.9514V14.8116Z" fill="#FF0000"/>
-<path d="M62.4702 10.1884H50.9514V14.8098H62.4702V10.1884Z" fill="#FF0000"/>
-</g>
-<defs>
-<clipPath id="clip0_1842_2">
-<rect width="85.3659" height="25" fill="#FF0000"/>
-</clipPath>
-</defs>
-</svg>
diff --git a/components/frontend/static/images/logos/johnson_logo.png b/components/frontend/static/images/logos/johnson_logo.png
deleted file mode 100644
index bf4c9f97..00000000
--- a/components/frontend/static/images/logos/johnson_logo.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:5f68f5a03bc0780aa24fbfba8bf21245586b24d0a792f20d0a603203e0fe48cf
-size 71763
diff --git a/components/frontend/static/images/logos/psi-white.png b/components/frontend/static/images/logos/psi-white.png
deleted file mode 100644
index 73713c90..00000000
--- a/components/frontend/static/images/logos/psi-white.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8d6f8a7473b6b05c620f892e656f17f5a38d635b09425abec10f6c6b867070f2
-size 6121
diff --git a/components/frontend/static/images/logos/psi.png b/components/frontend/static/images/logos/psi.png
index 5ed2f03f..73713c90 100644
--- a/components/frontend/static/images/logos/psi.png
+++ b/components/frontend/static/images/logos/psi.png
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:fccf4a0c3e186343cba403f17c3afc19ee298cd3ea56006946013275e310b1b3
-size 6190
+oid sha256:8d6f8a7473b6b05c620f892e656f17f5a38d635b09425abec10f6c6b867070f2
+size 6121
diff --git a/components/frontend/static/images/logos/psi_logo.png b/components/frontend/static/images/logos/psi_logo.png
deleted file mode 100644
index 7fb6800a..00000000
--- a/components/frontend/static/images/logos/psi_logo.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:b93e05a978c270709cdcd6c981f1c597029c0df2588fe576c91ecbc0e48f1585
-size 5237
diff --git a/components/frontend/static/images/logos/richemont_logo.png b/components/frontend/static/images/logos/richemont_logo.png
deleted file mode 100644
index f510a2e5..00000000
--- a/components/frontend/static/images/logos/richemont_logo.png
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:2c5835223e21895633924845aaf4a5a1b20f1f74e9e4b4e8ba90c8106bc20e77
-size 57192