diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd08943f9..c40d56f0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Fixed
 - Fixed the modification of the original timestamp when decompressing folders ([#190])
+- Fixed a crash when opening very large text files in the built-in editor by adding a 1 MB size limit ([#123])
 
 ## [1.6.1] - 2026-02-14
 ### Changed
@@ -125,6 +126,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#105]: https://github.com/FossifyOrg/File-Manager/issues/105
 [#106]: https://github.com/FossifyOrg/File-Manager/issues/106
 [#120]: https://github.com/FossifyOrg/File-Manager/issues/120
+[#123]: https://github.com/FossifyOrg/File-Manager/issues/123
 [#131]: https://github.com/FossifyOrg/File-Manager/issues/131
 [#136]: https://github.com/FossifyOrg/File-Manager/issues/136
 [#149]: https://github.com/FossifyOrg/File-Manager/issues/149
diff --git a/app/src/main/kotlin/org/fossify/filemanager/activities/ReadTextActivity.kt b/app/src/main/kotlin/org/fossify/filemanager/activities/ReadTextActivity.kt
index 9696e0650..0600f07b1 100644
--- a/app/src/main/kotlin/org/fossify/filemanager/activities/ReadTextActivity.kt
+++ b/app/src/main/kotlin/org/fossify/filemanager/activities/ReadTextActivity.kt
@@ -34,6 +34,7 @@ class ReadTextActivity : SimpleActivity() {
         private const val SELECT_SAVE_FILE_INTENT = 1
         private const val SELECT_SAVE_FILE_AND_EXIT_INTENT = 2
         private const val KEY_UNSAVED_TEXT = "KEY_UNSAVED_TEXT"
+        private const val FILE_SIZE_LIMIT = 1000 * 1000 // 1 MB, same limit as Fossify Notes
     }
 
     private val binding by viewBinding(ActivityReadTextBinding::inflate)
@@ -285,6 +286,18 @@ class ReadTextActivity : SimpleActivity() {
     }
 
     private fun checkIntent(uri: Uri, savedInstanceState: Bundle?) {
+        val fileSize = if (uri.scheme == "file") {
+            File(uri.path!!).length()
+        } else {
+            getSizeFromContentUri(uri)
+        }
+
+        if (fileSize > FILE_SIZE_LIMIT) {
+            toast(R.string.file_too_large)
+            finish()
+            return
+        }
+
         originalText = if (uri.scheme == "file") {
             filePath = uri.path!!
             val file = File(filePath)
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 07a68b549..009fe67a5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -40,6 +40,7 @@
 
     <!-- File Editor -->
     <string name="file_editor">File Editor</string>
+    <string name="file_too_large">File too large, the limit is 1MB</string>
 
     <!-- Storage analysis -->
     <string name="storage_analysis">Storage analysis</string>