diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90bcb6b24..6992ace6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to
 ### Fixed
 
 - 🐛(frontend) hide Leave in the doc menu when not logged in #2626
+- 🐛(backend) allow to configure settings DATA_UPLOAD_MAX_MEMORY_SIZE
 
 ## [v5.6.0] - 2026-09-03
 
diff --git a/documentation/env.md b/documentation/env.md
index 15e18475a..70218f300 100644
--- a/documentation/env.md
+++ b/documentation/env.md
@@ -61,6 +61,7 @@ These are the environment variables you can set for the `impress-backend` contai
 | DJANGO_CORS_ALLOWED_ORIGIN_REGEXES              | List of origins allowed for CORS using regulair expressions                                                                                                                | []                                                                      |
 | DJANGO_CORS_ALLOW_ALL_ORIGINS                   | Allow all CORS origins                                                                                                                                                     | false                                                                   |
 | DJANGO_CSRF_TRUSTED_ORIGINS                     | CSRF trusted origins                                                                                                                                                       | []                                                                      |
+| DJANGO_DATA_UPLOAD_MAX_MEMORY_SIZE              | The maximum size in bytes that a request body may be should be equal to the maximum between `DOCUMENT_IMAGE_MAX_SIZE` and `CONVERSION_FILE_MAX_SIZE`. See: https://docs.djangoproject.com/en/6.1/ref/settings/#data-upload-max-memory-size | 20 MB  |
 | DJANGO_EMAIL_BACKEND                            | Email backend library                                                                                                                                                      | django.core.mail.backends.smtp.EmailBackend                             |
 | DJANGO_EMAIL_BRAND_NAME                         | Brand name for email                                                                                                                                                       |                                                                         |
 | DJANGO_EMAIL_FROM                               | Email address used as sender                                                                                                                                               | from@example.com                                                        |
diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index 00cdb2bf4..3b4dbf9dd 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -206,6 +206,8 @@ class Base(Configuration):
         environ_prefix=None,
     )
 
+    DATA_UPLOAD_MAX_MEMORY_SIZE = values.IntegerValue(20 * MB)  # 20 MB
+
     REACTIONS_MAX_PER_COMMENT = values.IntegerValue(
         15,
         environ_name="REACTIONS_MAX_PER_COMMENT",
@@ -937,7 +939,7 @@ class Base(Configuration):
         False, environ_name="CONVERSION_UPLOAD_ENABLED", environ_prefix=None
     )
     CONVERSION_FILE_MAX_SIZE = values.IntegerValue(
-        20 * MB,
+        default=DATA_UPLOAD_MAX_MEMORY_SIZE,
         environ_name="CONVERSION_FILE_MAX_SIZE",
         environ_prefix=None,
     )