diff --git a/.changeset/eight-birds-trade.md b/.changeset/eight-birds-trade.md
new file mode 100644
index 00000000000..2e5403ed5b4
--- /dev/null
+++ b/.changeset/eight-birds-trade.md
@@ -0,0 +1,5 @@
+---
+"@fuel-ts/abi-coder": minor
+---
+
+ABI coder will throw when encoding a string with a value legnth mismatch
diff --git a/packages/abi-coder/src/coders/string.test.ts b/packages/abi-coder/src/coders/string.test.ts
index 71628f976f8..c2e09159263 100644
--- a/packages/abi-coder/src/coders/string.test.ts
+++ b/packages/abi-coder/src/coders/string.test.ts
@@ -44,21 +44,22 @@ describe('StringCoder', () => {
     expect(actualLength).toBe(expectedLength);
   });
 
-  it('should not completely encode a string that is too big for the coder', () => {
-    const coderLength = 0;
-    const coder = new StringCoder(coderLength);
+  it('should throw when encoding a string that is too big', () => {
+    const coder = new StringCoder(0);
     const invalidInput = STRING_MAX_DECODED;
-    const actual = coder.encode(invalidInput);
 
-    expect(actual).not.toStrictEqual(STRING_MAX_ENCODED);
+    expect(() => {
+      coder.encode(invalidInput);
+    }).toThrow();
   });
 
-  it('should not completely encode a string that is too small for the coder', () => {
+  it('should throw when encoding a string that is too small', () => {
     const coder = new StringCoder(1);
     const invalidInput = STRING_MIN_DECODED;
-    const actual = coder.encode(invalidInput);
 
-    expect(actual).not.toStrictEqual(STRING_MIN_ENCODED);
+    expect(() => {
+      coder.encode(invalidInput);
+    }).toThrow();
   });
 
   it('should not completely decode a string that is too big for the coder', () => {
diff --git a/packages/abi-coder/src/coders/string.ts b/packages/abi-coder/src/coders/string.ts
index 2593fd0fb32..55e318e4160 100644
--- a/packages/abi-coder/src/coders/string.ts
+++ b/packages/abi-coder/src/coders/string.ts
@@ -16,7 +16,11 @@ export default class StringCoder<TLength extends number = number> extends Coder<
   }
 
   encode(value: string): Uint8Array {
-    const encoded = toUtf8Bytes(value.slice(0, this.length));
+    if (this.length !== value.length) {
+      this.throwError('Value length mismatch during encode', value);
+    }
+
+    const encoded = toUtf8Bytes(value);
     const padding = new Uint8Array(this.#paddingLength);
     return concat([encoded, padding]);
   }