diff --git a/interface/src/app/main/Customizations.tsx b/interface/src/app/main/Customizations.tsx
index d975e6442..013492275 100644
--- a/interface/src/app/main/Customizations.tsx
+++ b/interface/src/app/main/Customizations.tsx
@@ -11,6 +11,7 @@ import WarningIcon from '@mui/icons-material/Warning';
 import {
   Box,
   Button,
+  Checkbox,
   Dialog,
   DialogActions,
   DialogContent,
@@ -91,6 +92,8 @@ const Customizations = () => {
   const [deviceEntities, setDeviceEntities] = useState<DeviceEntity[]>([]);
   const [confirmReset, setConfirmReset] = useState<boolean>(false);
   const [selectedFilters, setSelectedFilters] = useState<number>(0);
+  const [modifiedOnly, setModifiedOnly] = useState<boolean>(false);
+  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());
   const [search, setSearch] = useState('');
   const [selectedDeviceEntity, setSelectedDeviceEntity] = useState<DeviceEntity>();
   const [dialogOpen, setDialogOpen] = useState<boolean>(false);
@@ -173,7 +176,7 @@ const Customizations = () => {
 
   const entities_theme = useTheme({
     Table: `
-      --data-table-library_grid-template-columns: 156px repeat(1, minmax(80px, 1fr)) 45px minmax(45px, auto) minmax(120px, auto);
+      --data-table-library_grid-template-columns: 32px 156px repeat(1, minmax(80px, 1fr)) 45px minmax(45px, auto) minmax(120px, auto);
     `,
     BaseRow: `
       font-size: 14px;
@@ -182,10 +185,10 @@ const Customizations = () => {
       }
     `,
     BaseCell: `
-      &:nth-of-type(3) {
+      &:nth-of-type(4) {
         text-align: right;
       }
-      &:nth-of-type(4) {
+      &:nth-of-type(5) {
         text-align: right;
       }
       &:last-of-type {
@@ -221,13 +224,13 @@ const Customizations = () => {
       }
     `,
     Cell: `
-      &:nth-of-type(2) {
+      &:nth-of-type(3) {
         padding: 8px;
       }
-      &:nth-of-type(3) {
+      &:nth-of-type(4) {
         padding-right: 4px;
       }
-      &:nth-of-type(4) {
+      &:nth-of-type(5) {
         padding-right: 4px;
       }
       &:last-of-type {
@@ -245,6 +248,11 @@ const Customizations = () => {
     );
   }
 
+  // Saved customization (c), or an edit that is not applied yet.
+  function isModified(de: DeviceEntity) {
+    return !!de.c || hasEntityChanged(de);
+  }
+
   useEffect(() => {
     if (deviceEntities.length) {
       const changedEntities = deviceEntities.filter((de) => hasEntityChanged(de));
@@ -267,6 +275,7 @@ const Customizations = () => {
           setSelectedDeviceBrand(device.b);
         }
         setNumChanges(0);
+        setSelectedIds(new Set());
         setRestartNeeded(false);
       }
     }
@@ -331,24 +340,61 @@ const Customizations = () => {
 
   const filter_entity = (de: DeviceEntity) =>
     (de.m & selectedFilters || !selectedFilters) &&
+    (!modifiedOnly || isModified(de)) &&
     formatName(de, true).toLowerCase().includes(search.toLowerCase());
 
+  // Checked rows when any are checked, otherwise every row the filter is showing.
+  const inBulkTarget = (de: DeviceEntity) =>
+    selectedIds.size > 0 ? selectedIds.has(de.id) : filter_entity(de);
+
   const maskDisabled = (set: boolean) => {
+    const excludeMask =
+      DeviceEntityMask.DV_API_MQTT_EXCLUDE | DeviceEntityMask.DV_WEB_EXCLUDE;
     setDeviceEntities((prev) =>
       prev.map((de) => {
-        if (filter_entity(de)) {
-          const excludeMask =
-            DeviceEntityMask.DV_API_MQTT_EXCLUDE | DeviceEntityMask.DV_WEB_EXCLUDE;
-          return {
-            ...de,
-            m: set ? de.m | excludeMask : de.m & ~excludeMask
-          };
+        if (!inBulkTarget(de)) {
+          return de;
         }
-        return de;
+        return {
+          ...de,
+          m: set ? de.m | excludeMask : de.m & ~excludeMask
+        };
       })
     );
   };
 
+  const maskReadonly = (set: boolean) => {
+    setDeviceEntities((prev) =>
+      prev.map((de) => {
+        if (!inBulkTarget(de) || !de.w) {
+          return de;
+        }
+        return {
+          ...de,
+          m: set
+            ? de.m | DeviceEntityMask.DV_READONLY
+            : de.m & ~DeviceEntityMask.DV_READONLY
+        };
+      })
+    );
+  };
+
+  const resetSelected = () => {
+    setDeviceEntities((prev) =>
+      prev.map((de) => {
+        if (!selectedIds.has(de.id)) {
+          return de;
+        }
+        const next: DeviceEntity = { ...de, m: 0, c: false };
+        delete next.cn;
+        delete next.mi;
+        delete next.ma;
+        return next;
+      })
+    );
+    setSelectedIds(new Set());
+  };
+
   const resetCustomization = async () => {
     try {
       await sendResetCustomizations();
@@ -414,6 +460,8 @@ const Customizations = () => {
     })
       .then(() => {
         toast.success(LL.CUSTOMIZATIONS_SAVED());
+        // Reload so cleared min/max fall back to the built-in limits and the modified flag matches the file.
+        void sendDeviceEntities(selectedDevice);
       })
       .catch((error: Error) => {
         if (error.message === 'Reboot required') {
@@ -541,6 +589,34 @@ const Customizations = () => {
   );
 
   const filteredEntities = deviceEntities.filter((de) => filter_entity(de));
+  const allFilteredSelected =
+    filteredEntities.length > 0 &&
+    filteredEntities.every((de) => selectedIds.has(de.id));
+  const someFilteredSelected = filteredEntities.some((de) => selectedIds.has(de.id));
+
+  const toggleSelected = (id: string) => {
+    setSelectedIds((prev) => {
+      const next = new Set(prev);
+      if (next.has(id)) {
+        next.delete(id);
+      } else {
+        next.add(id);
+      }
+      return next;
+    });
+  };
+
+  const toggleSelectFiltered = () => {
+    setSelectedIds((prev) => {
+      const next = new Set(prev);
+      if (allFilteredSelected) {
+        filteredEntities.forEach((de) => next.delete(de.id));
+      } else {
+        filteredEntities.forEach((de) => next.add(de.id));
+      }
+      return next;
+    });
+  };
 
   const renderDeviceData = () => {
     return (
@@ -608,6 +684,17 @@ const Customizations = () => {
               </ToggleButton>
             </ToggleButtonGroup>
           </Grid>
+          <Grid>
+            <Button
+              size="small"
+              sx={{ fontSize: 10 }}
+              variant="outlined"
+              color={modifiedOnly ? 'secondary' : 'inherit'}
+              onClick={() => setModifiedOnly((current) => !current)}
+            >
+              {LL.MODIFIED()}
+            </Button>
+          </Grid>
           <Grid>
             <Button
               size="small"
@@ -634,6 +721,43 @@ const Customizations = () => {
               <OptionIcon type="web_exclude" isSet={true} />
             </Button>
           </Grid>
+          <Grid>
+            <Button
+              size="small"
+              sx={{ fontSize: 10 }}
+              variant="outlined"
+              color="inherit"
+              onClick={() => maskReadonly(false)}
+            >
+              {LL.SET_ALL()}&nbsp;
+              <OptionIcon type="readonly" isSet={false} />
+            </Button>
+          </Grid>
+          <Grid>
+            <Button
+              size="small"
+              sx={{ fontSize: 10 }}
+              variant="outlined"
+              color="inherit"
+              onClick={() => maskReadonly(true)}
+            >
+              {LL.SET_ALL()}&nbsp;
+              <OptionIcon type="readonly" isSet={true} />
+            </Button>
+          </Grid>
+          {selectedIds.size > 0 && (
+            <Grid>
+              <Button
+                size="small"
+                sx={{ fontSize: 10 }}
+                variant="outlined"
+                color="error"
+                onClick={resetSelected}
+              >
+                {LL.RESET_SELECTED()} ({selectedIds.size})
+              </Button>
+            </Grid>
+          )}
           <Grid>
             <Typography variant="subtitle2" color="grey">
               {LL.SHOWING()}&nbsp;{filteredEntities.length}/{deviceEntities.length}
@@ -650,6 +774,16 @@ const Customizations = () => {
             <>
               <Header>
                 <HeaderRow>
+                  <HeaderCell stiff>
+                    <Checkbox
+                      size="small"
+                      sx={{ p: 0, color: 'inherit' }}
+                      checked={allFilteredSelected}
+                      indeterminate={!allFilteredSelected && someFilteredSelected}
+                      disabled={filteredEntities.length === 0}
+                      onChange={toggleSelectFiltered}
+                    />
+                  </HeaderCell>
                   <HeaderCell stiff>{LL.OPTIONS()}</HeaderCell>
                   <HeaderCell resize>{LL.NAME(1)}</HeaderCell>
                   <HeaderCell stiff>{LL.MIN()}</HeaderCell>
@@ -660,6 +794,14 @@ const Customizations = () => {
               <Body>
                 {tableList.map((de: DeviceEntity) => (
                   <Row key={de.id} item={de} onClick={() => editDeviceEntity(de)}>
+                    <Cell stiff onClick={(event) => event.stopPropagation()}>
+                      <Checkbox
+                        size="small"
+                        sx={{ p: 0 }}
+                        checked={selectedIds.has(de.id)}
+                        onChange={() => toggleSelected(de.id)}
+                      />
+                    </Cell>
                     <Cell stiff>
                       <EntityMaskToggle onUpdate={updateDeviceEntity} de={de} />
                     </Cell>
diff --git a/interface/src/app/main/CustomizationsDialog.tsx b/interface/src/app/main/CustomizationsDialog.tsx
index 9e5d68ca9..d701487bb 100644
--- a/interface/src/app/main/CustomizationsDialog.tsx
+++ b/interface/src/app/main/CustomizationsDialog.tsx
@@ -3,6 +3,7 @@ import { memo, useEffect, useState } from 'react';
 import CancelIcon from '@mui/icons-material/Cancel';
 import CloseIcon from '@mui/icons-material/Close';
 import DoneIcon from '@mui/icons-material/Done';
+import SettingsBackupRestoreIcon from '@mui/icons-material/SettingsBackupRestore';
 import {
   Box,
   Button,
@@ -101,6 +102,14 @@ const CustomizationsDialog = ({
     setEditItem((prev) => ({ ...prev, m: updatedItem.m }));
   };
 
+  const remove = () => {
+    const next: DeviceEntity = { ...editItem, m: 0, c: false };
+    delete next.cn;
+    delete next.mi;
+    delete next.ma;
+    onSave(next);
+  };
+
   return (
     <Dialog sx={dialogStyle} open={open} onClose={handleClose}>
       <DialogTitle>{`${LL.EDIT()} ${LL.ENTITY()}`}</DialogTitle>
@@ -169,6 +178,15 @@ const CustomizationsDialog = ({
       </DialogContent>
 
       <DialogActions>
+        <Button
+          startIcon={<SettingsBackupRestoreIcon />}
+          variant="outlined"
+          onClick={remove}
+          color="error"
+        >
+          {LL.REMOVE()}
+        </Button>
+        <Box sx={{ flexGrow: 1 }} />
         <Button
           startIcon={<CancelIcon />}
           variant="outlined"
diff --git a/interface/src/app/main/types.ts b/interface/src/app/main/types.ts
index 20bb515e3..44290428f 100644
--- a/interface/src/app/main/types.ts
+++ b/interface/src/app/main/types.ts
@@ -174,6 +174,7 @@ export interface DeviceEntity {
   w: boolean; // writeable
   mi?: number; // min value
   ma?: number; // max value
+  c?: boolean; // true when a customization is saved (mask, name, or min/max)
   o_m?: number; // original mask before edits
   o_cn?: string; // original cn before edits
   o_mi?: number; // original min value
diff --git a/interface/src/i18n/cs/index.ts b/interface/src/i18n/cs/index.ts
index 908a58476..87bbf911b 100644
--- a/interface/src/i18n/cs/index.ts
+++ b/interface/src/i18n/cs/index.ts
@@ -141,6 +141,8 @@ const cs: Translation = {
   CUSTOMIZATIONS_HELP_6: 'odstranit z paměti',
   SELECT_DEVICE: 'Vyberte zařízení',
   SET_ALL: 'nastavit vše',
+  MODIFIED: 'upravené',
+  RESET_SELECTED: 'Obnovit vybrané',
   OPTIONS: 'Možnosti',
   NAME: 'Název',
   CUSTOMIZATIONS_RESET: 'Opravdu chcete odstranit všechna přizpůsobení?',
diff --git a/interface/src/i18n/de/index.ts b/interface/src/i18n/de/index.ts
index 7eab41625..1abe46f99 100644
--- a/interface/src/i18n/de/index.ts
+++ b/interface/src/i18n/de/index.ts
@@ -141,6 +141,8 @@ const de: Translation = {
   CUSTOMIZATIONS_HELP_6: 'Aus dem Speicher entfernen',
   SELECT_DEVICE: 'Wählen Sie ein Gerät aus',
   SET_ALL: 'Setzen Sie alle',
+  MODIFIED: 'geändert',
+  RESET_SELECTED: 'Auswahl zurücksetzen',
   OPTIONS: 'Optionen',
   NAME: 'Name',
   CUSTOMIZATIONS_RESET: 'Möchten Sie wirklich alle Anpassungen entfernen?',
diff --git a/interface/src/i18n/en/index.ts b/interface/src/i18n/en/index.ts
index 9a99ea19e..96e19ef30 100644
--- a/interface/src/i18n/en/index.ts
+++ b/interface/src/i18n/en/index.ts
@@ -141,6 +141,8 @@ const en: Translation = {
   CUSTOMIZATIONS_HELP_6: 'remove from memory',
   SELECT_DEVICE: 'Select a device',
   SET_ALL: 'set all',
+  MODIFIED: 'modified',
+  RESET_SELECTED: 'Reset selected',
   OPTIONS: 'Options',
   NAME: 'Name',
   CUSTOMIZATIONS_RESET: 'Are you sure you want remove all the customizations?',
diff --git a/interface/src/i18n/fr/index.ts b/interface/src/i18n/fr/index.ts
index b1eb608ad..841c34d63 100644
--- a/interface/src/i18n/fr/index.ts
+++ b/interface/src/i18n/fr/index.ts
@@ -141,6 +141,8 @@ const fr: Translation = {
   CUSTOMIZATIONS_HELP_6: 'supprimer de la mémoire',
   SELECT_DEVICE: 'Sélectionnez un appareil',
   SET_ALL: 'tout régler',
+  MODIFIED: 'modifié',
+  RESET_SELECTED: 'Réinitialiser la sélection',
   OPTIONS: 'Options',
   NAME: 'Nom',
   CUSTOMIZATIONS_RESET: 'Êtes-vous sûr de vouloir supprimer toutes les personnalisations?',
diff --git a/interface/src/i18n/it/index.ts b/interface/src/i18n/it/index.ts
index 05211369f..7e364e252 100644
--- a/interface/src/i18n/it/index.ts
+++ b/interface/src/i18n/it/index.ts
@@ -141,6 +141,8 @@ const it: Translation = {
   CUSTOMIZATIONS_HELP_6: 'rimuovi dalla memoria',
   SELECT_DEVICE: 'Seleziona un dispositivo',
   SET_ALL: 'imposta tutto',
+  MODIFIED: 'modificato',
+  RESET_SELECTED: 'Reimposta selezionati',
   OPTIONS: 'Opzioni',
   NAME: 'Nome',
   CUSTOMIZATIONS_RESET: 'Sei sicuro di voler rimuovere tutte le personalizzazioni?',
diff --git a/interface/src/i18n/nl/index.ts b/interface/src/i18n/nl/index.ts
index 8b1be0bb0..c6e5998e1 100644
--- a/interface/src/i18n/nl/index.ts
+++ b/interface/src/i18n/nl/index.ts
@@ -141,6 +141,8 @@ const nl: Translation = {
   CUSTOMIZATIONS_HELP_6: 'verwijderen van memory',
   SELECT_DEVICE: 'Selecteer een apparaat',
   SET_ALL: 'Alles aanzetten',
+  MODIFIED: 'gewijzigd',
+  RESET_SELECTED: 'Selectie resetten',
   OPTIONS: 'Opties',
   NAME: 'Naam',
   CUSTOMIZATIONS_RESET: 'Weet je zeker dat je alle custom aanpassingen wilt verwijderen?',
diff --git a/interface/src/i18n/no/index.ts b/interface/src/i18n/no/index.ts
index 06e199143..b283f0513 100644
--- a/interface/src/i18n/no/index.ts
+++ b/interface/src/i18n/no/index.ts
@@ -141,6 +141,8 @@ const no: Translation = {
   CUSTOMIZATIONS_HELP_6: 'fjern fra minnet',
   SELECT_DEVICE: 'Velg en enhet',
   SET_ALL: 'sett alle',
+  MODIFIED: 'endret',
+  RESET_SELECTED: 'Tilbakestill valgte',
   OPTIONS: 'Alternativ',
   NAME: 'Navn',
   CUSTOMIZATIONS_RESET: 'Er du sikker på att du vil fjerne tilpassninger?',
diff --git a/interface/src/i18n/pl/index.ts b/interface/src/i18n/pl/index.ts
index f4728bad8..8f405c2bc 100644
--- a/interface/src/i18n/pl/index.ts
+++ b/interface/src/i18n/pl/index.ts
@@ -141,6 +141,8 @@ const pl: BaseTranslation = {
   CUSTOMIZATIONS_HELP_6: 'usuń z pamięci',
   SELECT_DEVICE: 'wybierz urządzenie',
   SET_ALL: 'Ustaw wszystko jako',
+  MODIFIED: 'zmienione',
+  RESET_SELECTED: 'Resetuj zaznaczone',
   OPTIONS: 'Opcje',
   NAME: '{{Nazwa|nazwa|}}',
   CUSTOMIZATIONS_RESET: 'Na pewno chcesz usunąć wszystkie personalizacje?',
diff --git a/interface/src/i18n/sk/index.ts b/interface/src/i18n/sk/index.ts
index 3963108e0..3b4374c92 100644
--- a/interface/src/i18n/sk/index.ts
+++ b/interface/src/i18n/sk/index.ts
@@ -141,6 +141,8 @@ const sk: Translation = {
   CUSTOMIZATIONS_HELP_6: 'odstrániť z pamäte',
   SELECT_DEVICE: 'Zvoliť zariadenie',
   SET_ALL: 'nastaviť všetko',
+  MODIFIED: 'upravené',
+  RESET_SELECTED: 'Obnoviť vybrané',
   OPTIONS: 'Možnosti',
   NAME: 'Názov',
   CUSTOMIZATIONS_RESET: 'Naozaj chcete odstrániť všetky prispôsobenia?',
diff --git a/interface/src/i18n/sv/index.ts b/interface/src/i18n/sv/index.ts
index 8075828a5..4a455ffb7 100644
--- a/interface/src/i18n/sv/index.ts
+++ b/interface/src/i18n/sv/index.ts
@@ -141,6 +141,8 @@ const sv: Translation = {
   CUSTOMIZATIONS_HELP_6: 'Ta bort',
   SELECT_DEVICE: 'Välj en enhet',
   SET_ALL: 'ställ in alla',
+  MODIFIED: 'ändrade',
+  RESET_SELECTED: 'Återställ markerade',
   OPTIONS: 'Alternativ',
   NAME: 'Namn',
   CUSTOMIZATIONS_RESET: 'Är du säker på att du vill ta bort alla anpassningar?',
diff --git a/interface/src/i18n/tr/index.ts b/interface/src/i18n/tr/index.ts
index 7d776f9bc..5cdb2fad5 100644
--- a/interface/src/i18n/tr/index.ts
+++ b/interface/src/i18n/tr/index.ts
@@ -141,6 +141,8 @@ const tr: Translation = {
   CUSTOMIZATIONS_HELP_6: 'remove from memory',
   SELECT_DEVICE: 'Bir cihaz seç',
   SET_ALL: 'hepsini ayarla',
+  MODIFIED: 'değiştirilmiş',
+  RESET_SELECTED: 'Seçilenleri sıfırla',
   OPTIONS: 'Seçenekler',
   NAME: 'İsim',
   CUSTOMIZATIONS_RESET: 'Bütün özelleştirmeleri kaldırmak istediğinizden emin misiniz?',
diff --git a/src/core/emsdevice.cpp b/src/core/emsdevice.cpp
index 3ca1a427a..f0c35d4f1 100644
--- a/src/core/emsdevice.cpp
+++ b/src/core/emsdevice.cpp
@@ -1193,6 +1193,12 @@ void EMSdevice::generate_values_web_customization(JsonArray output) {
         // 0x10 = 16  = DV_WEB_EXCLUDE
         obj["m"] = dv.state >> 4;
 
+        // Saved customization: mask bits, or a custom name/min/max stored in custom_fullname.
+        // Min/max in "mi"/"ma" are the effective limits, so they alone do not show a customization.
+        if (dv.has_custom_fullname() || (dv.state >> 4) != 0) {
+            obj["c"] = true;
+        }
+
         obj["w"] = dv.has_cmd; // if writable
 
         if (dv.has_cmd && (obj["v"].is<float>() || obj["v"].is<int>())) {
@@ -1219,6 +1225,7 @@ void EMSdevice::generate_values_web_customization(JsonArray output) {
                         JsonObject obj = output.add<JsonObject>();
                         obj["id"]      = DeviceValue::get_name(entity_id); // set the name, it could be custom following a '|'
                         obj["m"]       = mask;                             // update the mask
+                        obj["c"]       = true;
                         obj["w"]       = false;                            // not writeable as it won't be shown
                     }
                 }