diff --git a/examples/ggwave-to-file/README.md b/examples/ggwave-to-file/README.md
index faf6d44..502bce7 100644
--- a/examples/ggwave-to-file/README.md
+++ b/examples/ggwave-to-file/README.md
@@ -3,10 +3,11 @@
 Output a generated waveform to an uncompressed WAV file.
 
 ```
-Usage: ./bin/ggwave-to-file [-vN] [-sN] [-pN]
+Usage: ./bin/ggwave-to-file [-vN] [-sN] [-pN] [-lN]
     -vN - output volume, N in (0, 100], (default: 50)
     -sN - output sample rate, N in [6000, 96000], (default: 48000)
     -pN - select the transmission protocol id (default: 1)
+    -lN - fixed payload length of size N, N in [1, 16]
 
     Available protocols:
       0 - Normal
@@ -40,6 +41,12 @@ Usage: ./bin/ggwave-to-file [-vN] [-sN] [-pN]
   echo "Hello world!" | ./bin/ggwave-to-file -p4 > example.wav
   ```
 
+- Use fixed-length encoding (i.e. no sound markers)
+
+  ```bash
+  echo "Hello world!" | ./bin/ggwave-to-file -l12 > example.wav
+  ```
+
 
 ## HTTP service
 
@@ -75,7 +82,7 @@ curl -sS 'https://ggwave-to-file.ggerganov.com/?m=Hello world!&p=4' --output hel
 ```python
 import requests
 
-def ggwave(message: str, protocolId: int = 1, sampleRate: float = 48000, volume: int = 50):
+def ggwave(message: str, protocolId: int = 1, sampleRate: float = 48000, volume: int = 50, payloadLength: int = -1):
 
     url = 'https://ggwave-to-file.ggerganov.com/'
 
@@ -84,6 +91,7 @@ def ggwave(message: str, protocolId: int = 1, sampleRate: float = 48000, volume:
         'p': protocolId,    # transmission protocol to use
         's': sampleRate,    # output sample rate
         'v': volume,        # output volume
+        'l': payloadLength, # if positive - use fixed-length encoding
     }
 
     response = requests.get(url, params=params)
diff --git a/examples/ggwave-to-file/ggwave-to-file.php b/examples/ggwave-to-file/ggwave-to-file.php
index a393d00..275d62a 100644
--- a/examples/ggwave-to-file/ggwave-to-file.php
+++ b/examples/ggwave-to-file/ggwave-to-file.php
@@ -5,6 +5,7 @@ $cmd = "ggwave-to-file";
 if (isset($_GET['s'])) { $cmd .= " -s".intval($_GET['s']); }
 if (isset($_GET['v'])) { $cmd .= " -v".intval($_GET['v']); }
 if (isset($_GET['p'])) { $cmd .= " -p".intval($_GET['p']); }
+if (isset($_GET['l'])) { $cmd .= " -l".intval($_GET['l']); }
 
 $descriptorspec = array(
     0 => array("pipe", "r"),
diff --git a/examples/ggwave-to-file/main.cpp b/examples/ggwave-to-file/main.cpp
index 2cdfbaf..66d52d9 100644
--- a/examples/ggwave-to-file/main.cpp
+++ b/examples/ggwave-to-file/main.cpp
@@ -10,10 +10,11 @@
 #include <iostream>
 
 int main(int argc, char** argv) {
-    fprintf(stderr, "Usage: %s [-vN] [-sN] [-pN]\n", argv[0]);
+    fprintf(stderr, "Usage: %s [-vN] [-sN] [-pN] [-lN]\n", argv[0]);
     fprintf(stderr, "    -vN - output volume, N in (0, 100], (default: 50)\n");
     fprintf(stderr, "    -sN - output sample rate, N in [%d, %d], (default: %d)\n", (int) GGWave::kSampleRateMin, (int) GGWave::kSampleRateMax, (int) GGWave::kBaseSampleRate);
     fprintf(stderr, "    -pN - select the transmission protocol id (default: 1)\n");
+    fprintf(stderr, "    -lN - fixed payload length of size N, N in [1, %d]\n", GGWave::kMaxLengthFixed);
     fprintf(stderr, "\n");
     fprintf(stderr, "    Available protocols:\n");
 
@@ -36,6 +37,7 @@ int main(int argc, char** argv) {
     int volume = argm["v"].empty() ? 50 : std::stoi(argm["v"]);
     float sampleRateOut = argm["s"].empty() ? GGWave::kBaseSampleRate : std::stof(argm["s"]);
     int protocolId = argm["p"].empty() ? 1 : std::stoi(argm["p"]);
+    int payloadLength = argm["l"].empty() ? -1 : std::stoi(argm["l"]);
 
     if (volume <= 0 || volume > 100) {
         fprintf(stderr, "Invalid volume\n");
@@ -69,7 +71,7 @@ int main(int argc, char** argv) {
 
     fprintf(stderr, "Generating waveform for message '%s' ...\n", message.c_str());
 
-    GGWave ggWave({ -1, GGWave::kBaseSampleRate, sampleRateOut, 1024, GGWave::kDefaultSamplesPerFrame, GGWAVE_SAMPLE_FORMAT_F32, GGWAVE_SAMPLE_FORMAT_I16 });
+    GGWave ggWave({ payloadLength, GGWave::kBaseSampleRate, sampleRateOut, 1024, GGWave::kDefaultSamplesPerFrame, GGWAVE_SAMPLE_FORMAT_F32, GGWAVE_SAMPLE_FORMAT_I16 });
     ggWave.init(message.size(), message.data(), ggWave.getTxProtocol(protocolId), volume);
 
     std::vector<char> bufferPCM;