diff --git a/CHANGELOG.md b/CHANGELOG.md
index c496a33e..f7754463 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added a [section about character encodings to the implementation guide](meta/implementation.md#character-encoding).
   Removed any character encoding related wording from the process specifications itself.
 - Added a uniqueness contraint to various array-typed parameters (e.g. lists of dimension names or labels)
+- `all`: For empty arrays, returns `true` instead of no-data. [#494](https://github.com/Open-EO/openeo-processes/issues/494)
+- `any`: For empty arrays, returns `false` instead of no-data. [#494](https://github.com/Open-EO/openeo-processes/issues/494)
 - `apply_polygon`: Renamed `polygons` parameter to `geometries` for better alignment with other geometry handling processes. [#511](https://github.com/Open-EO/openeo-processes/issues/511)
 - `clip`: Throw an exception if min > max [#472](https://github.com/Open-EO/openeo-processes/issues/472)
 - `is_nan`: Return `false` instead of `true` for non-numerical data types. [#486](https://github.com/Open-EO/openeo-processes/issues/486)
diff --git a/all.json b/all.json
index dbf751a4..80d0ee0a 100644
--- a/all.json
+++ b/all.json
@@ -1,7 +1,7 @@
 {
     "id": "all",
     "summary": "Are all of the values true?",
-    "description": "Checks if **all** of the values in `data` are true. If no value is given (i.e. the array is empty) the process returns  the no-data value (or `null`).\n\nBy default all no-data values are ignored so that the process returns the no-data value (or `null`) if all values are no-data, `true` if all values are true and `false` otherwise. Setting the `ignore_nodata` flag to `false` takes no-data values into account and the array values are reduced pairwise according to the following truth table:\n\n```\n        || no-data | false | true\n------- || ------- | ----- | -------\nno-data || no-data | false | no-data\nfalse   || false   | false | false\ntrue    || no-data | false | true\n```\n\n**Remark:** The process evaluates all values from the first to the last element and stops once the outcome is unambiguous. A result is ambiguous unless a value is `false` or all values have been taken into account.",
+    "description": "Checks if **all** of the values in `data` are true. If no value is given (i.e. the array is empty) the process returns `true`.\n\nBy default, all no-data values are ignored so that the process returns `true` if all values are no-data or true, and `false` otherwise. Setting the `ignore_nodata` flag to `false` takes no-data values into account and the array values are reduced pairwise according to the following truth table:\n\n```\n        || no-data | false | true\n------- || ------- | ----- | -------\nno-data || no-data | false | no-data\nfalse   || false   | false | false\ntrue    || no-data | false | true\n```\n\n**Remark:** The process evaluates all values in an arbitrary order and stops once the outcome is unambiguous, i.e. when either a `false` value is encountered, or when all values have been taken into account.",
     "categories": [
         "logic",
         "reducer"
@@ -124,11 +124,19 @@
             },
             "returns": null
         },
+        {
+            "arguments": {
+                "data": [
+                    null
+                ]
+            },
+            "returns": true
+        },
         {
             "arguments": {
                 "data": []
             },
-            "returns": null
+            "returns": true
         }
     ]
 }
diff --git a/any.json b/any.json
index 4cdce32d..eaa9077b 100644
--- a/any.json
+++ b/any.json
@@ -1,7 +1,7 @@
 {
     "id": "any",
     "summary": "Is at least one value true?",
-    "description": "Checks if **any** (i.e. at least one) value in `data` is `true`. If no value is given (i.e. the array is empty) the process returns the no-data value (or `null`).\n\nBy default all no-data values are ignored so that the process returns the no-data value (or `null`) if all values are no-data, `true` if at least one value is true and `false` otherwise. Setting the `ignore_nodata` flag to `false` takes no-data values into account and the array values are reduced pairwise according to the following truth table:\n\n```\n        || no-data | false   | true\n------- || ------- | ------- | ----\nno-data || no-data | no-data | true\nfalse   || no-data | false   | true\ntrue    || true    | true    | true\n```\n\n**Remark:** The process evaluates all values from the first to the last element and stops once the outcome is unambiguous. A result is ambiguous unless a value is `true`.",
+    "description": "Checks if **any** (i.e. at least one) value in `data` is `true`. If no value is given (i.e. the array is empty) the process returns `false`.\n\nBy default all no-data values are ignored so that the process returns `true` if at least one value is true and `false` otherwise. Setting the `ignore_nodata` flag to `false` takes no-data values into account and the array values are reduced pairwise according to the following truth table:\n\n```\n        || no-data | false   | true\n------- || ------- | ------- | ----\nno-data || no-data | no-data | true\nfalse   || no-data | false   | true\ntrue    || true    | true    | true\n```\n\n**Remark:** The process evaluates all values in an arbitrary order and stops once the outcome is unambiguous, i.e. when either a `true` value is encountered, or when all values have been taken into account.",
     "categories": [
         "logic",
         "reducer"
@@ -124,11 +124,19 @@
             },
             "returns": null
         },
+        {
+            "arguments": {
+                "data": [
+                    null
+                ]
+            },
+            "returns": false
+        },
         {
             "arguments": {
                 "data": []
             },
-            "returns": null
+            "returns": false
         }
     ]
 }
diff --git a/tests/all.json5 b/tests/all.json5
index 4fa5bc0f..db4043ec 100644
--- a/tests/all.json5
+++ b/tests/all.json5
@@ -84,13 +84,13 @@
         ],
         "ignore_nodata": false
       },
-      "returns": {"type": "nodata"}
+      "returns": true
     },
     {
       "arguments": {
         "data": []
       },
-      "returns": {"type": "nodata"}
+      "returns": true
     }
   ]
 }
diff --git a/tests/any.json5 b/tests/any.json5
index ab480704..c89f68e0 100644
--- a/tests/any.json5
+++ b/tests/any.json5
@@ -84,13 +84,13 @@
         ],
         "ignore_nodata": false
       },
-      "returns": {"type": "nodata"}
+      "returns": false
     },
     {
       "arguments": {
         "data": []
       },
-      "returns": {"type": "nodata"}
+      "returns": false
     }
   ]
 }