diff --git a/CRC.js b/CRC.js
index 803c8b5..398dab0 100644
--- a/CRC.js
+++ b/CRC.js
@@ -1,3 +1,6 @@
+// CRC codes are not signed
+export const INVALID = -1;
+
 function calcCrc(
   bytes,
   size,
diff --git a/PacketUtils.js b/PacketUtils.js
index 026e998..5a7d310 100644
--- a/PacketUtils.js
+++ b/PacketUtils.js
@@ -2,6 +2,7 @@ let SEGMENT_DURATION = 30;
 let PACKET_SIZE_BITS = 8;
 let DATA_SIZE_BITS = 8;
 let DATA_SIZE_CRC_BITS = 8;
+let DATA_CRC_BITS = 8;
 let BITS_PER_SEGMENT = 1;
 let PACKET_ENCODING = false;
 let PACKET_ENCODING_SIZE = 7;
@@ -14,6 +15,7 @@ export const changeConfiguration = (config) => {
     packetSizeBitCount,
     dataSizeBitCount,
     dataSizeCrcBitCount,
+    dataCrcBitCount,
     bitsPerSegment,
     packetEncoding,
     packetEncodingBitCount,
@@ -23,6 +25,7 @@ export const changeConfiguration = (config) => {
   PACKET_SIZE_BITS = packetSizeBitCount;
   DATA_SIZE_BITS = dataSizeBitCount;
   DATA_SIZE_CRC_BITS = dataSizeCrcBitCount;
+  DATA_CRC_BITS = dataCrcBitCount;
   BITS_PER_SEGMENT = bitsPerSegment;
   PACKET_ENCODING = packetEncoding;
   PACKET_ENCODING_SIZE = packetEncodingBitCount;
@@ -81,7 +84,7 @@ export const canSendPacket = () => {
 }
 export const getPacketEncodingBlockCount = () =>
   isPacketEncoded() ? Math.floor(getPacketMaxBitCount() / packetEncodingBlockSize()) : 0;
-export const getPacketizationHeaderBitCount = () => DATA_SIZE_BITS + DATA_SIZE_CRC_BITS;
+export const getPacketizationHeaderBitCount = () => DATA_SIZE_BITS + DATA_SIZE_CRC_BITS + DATA_CRC_BITS;
 export const getPacketizationBitCountFromBitCount = (bitCount) => bitCount + getPacketizationHeaderBitCount();
 export const getPacketizationBitCountFromByteCount = (byteCount) =>
   getPacketizationBitCountFromBitCount(byteCount * 8);
diff --git a/Panels/PacketizationPanel.js b/Panels/PacketizationPanel.js
index 55d5c30..209e161 100644
--- a/Panels/PacketizationPanel.js
+++ b/Panels/PacketizationPanel.js
@@ -5,25 +5,59 @@ class PacketizationPanel extends BasePanel {
   constructor() {
     super('Packetization');
 
-    this.openField('Packet Size');
+    this.openField('Max Data Size');
+    this.addText('2^');
+    this.addInputNumber('data-size-power', 16, {min: 0, max: 32, eventName: 'dataSizePowerChange', translation: 'power of 2'});
+    this.addText(' ');
+    this.addDynamicText('data-size', 'n/a')
+    this.closeField();
+
+    this.openField('CRC on Size');
+    this.addDropdown('data-size-crc', [
+      {text: 'None', value: 0},
+      {text: 'CRC-8', value: 8},
+      {text: 'CRC-16', value: 16},
+      {text: 'CRC-32', value: 32},
+    ], 'dataSizeCrcChange');
+    this.closeField();
+
+    this.openField('CRC on Data');
+    this.addDropdown('data-crc', [
+      {text: 'None', value: 0},
+      {text: 'CRC-8', value: 8},
+      {text: 'CRC-16', value: 16},
+      {text: 'CRC-32', value: 32},
+    ], 'dataCrcChange');
+    this.closeField();
+
+    this.addSection('Packets');
+    this.openField('Size');
     this.addText('2^');
     this.addInputNumber('size-power', 5, {min: 0, max: 16, eventName: 'sizePowerChange', translation: 'power of 2'});
     this.addText(' ');
-    this.addDynamicText('size')
+    this.addDynamicText('size', 'n/a')
     this.closeField();
 
-    this.addSection('Encoding');
+    this.addCheckboxes('packet-encoding', [
+      { text: 'Error Correction', id: 'error-correction', checked: true, eventName: 'errorCorrectionChange' },
+    ]);
+    
+
+    this.addSection('Sampling Period');
 
     this.addCheckboxes('packet-encoding', [
       { text: 'Interleaving', id: 'interleaving', checked: true, eventName: 'interleavingChange' },
-      { text: 'Error Correction', id: 'error-correction', checked: true, eventName: 'errorCorrectionChange' },
     ]);
 
     this.addEventListener('sizePowerChange', this.handleSizePowerChange);
     this.dispatcher.emit('sizePowerChange', {value: this.getSize()});
+
+    this.addEventListener('dataSizePowerChange', this.handleDataSizePowerChange);
+    this.dispatcher.emit('dataSizePowerChange', {value: this.getDataSizePower()});
+    this.dispatcher.emit('dataSizeChange', {value: this.getDataSize()});
   };
 
-  getSizePower = () => parseInt(this.getValueById('size-power'));
+  getSizePower = () => this.getNumberById('size-power');
   setSizePower = (value) => {
     this.setValueById('size-power', value);
     this.handleSizePowerChange({value});
@@ -33,6 +67,22 @@ class PacketizationPanel extends BasePanel {
     this.setValueById('size', byteSize(this.getSize()));
   }
 
+  getDataSizePower = () => this.getNumberById('data-size-power');
+  setDataSizePower = (value) => {
+    this.setValueById('data-size-power', value);
+    this.handleDataSizePowerChange({value});
+  }
+  getDataSize = () => 2 ** this.getDataSizePower();
+  handleDataSizePowerChange = () => {
+    this.setValueById('data-size', byteSize(this.getDataSize()));
+  }
+
+  getDataSizeCrc = () => this.getNumberById('data-size-crc');
+  setDataSizeCrc = bitLength => this.setValueById('data-size-crc', bitLength)
+
+  getDataCrc = () => this.getNumberById('data-crc');
+  setDataCrc = bitLength => this.setValueById('data-crc', bitLength)
+
   getInterleaving = () => this.getCheckedById('interleaving');
   setInterleaving = (value) => this.setCheckedById('interleaving', value);
 
diff --git a/StreamManager.js b/StreamManager.js
index 5fb599e..e53000a 100644
--- a/StreamManager.js
+++ b/StreamManager.js
@@ -1,5 +1,10 @@
 import Dispatcher from "./Dispatcher";
-import { bitsToInt } from "./converters";
+import * as CRC from './CRC';
+import { 
+  bitsToBytes,
+  bitsToInt,
+  numberToBytes
+} from "./converters";
 
 const dispatcher = new Dispatcher('StreamManager', ['change']);
 
@@ -102,6 +107,23 @@ export const getAllPacketBits = () => {
   }
   return bits;
 }
+export const getAllPacketBitsDecoded = () => {
+  const packetCount = getPacketReceivedCount();
+  const bits = [];
+  for(let packetIndex = 0; packetIndex < packetCount; packetIndex++) {
+    bits.push(...getPacketBitsDecoded(packetIndex));
+  }
+  return bits;
+}
+export const getDataBytes = () => {
+  const bits = getAllPacketBitsDecoded();
+  bits.splice(0, getStreamHeaderBitCount());
+  const bytes = bitsToBytes(bits);
+  if(isTransferByteCountTrusted()) {
+    bytes.length = getTransferByteCount();
+  }
+  return bytes;
+}
 export const getPacketBits = (packetIndex, defaultBit = 0) => {
   const bits = [];
   const packet = BITS[packetIndex] ?? [];
@@ -121,10 +143,19 @@ export const getPacketBitsDecoded = (packetIndex, defaultBit = 0) => {
   const bits = getPacketBits(packetIndex, defaultBit);
   return PACKET_ENCODING.decode(bits);
 }
+const getStreamHeaderBitCount = () => {
+  return Object.keys(STREAM_HEADERS).reduce((lastBit, key) => {
+    const {index = 0, length = 0} = STREAM_HEADERS[key];
+    if(length === 0)  return lastBit;
+    if(lastBit < index + length) return index + length;
+    return lastBit;
+  }, 0);
+}
 const getStreamHeaderBits = name => {
   const header = STREAM_HEADERS[name];
   if(!header) return [];
   const { index, length } = header;
+  if(length === 0) return [];
   const packetCount = getPacketReceivedCount();
   const bits = [];
   for(let packetIndex = 0; packetIndex < packetCount; packetIndex++) {
@@ -136,6 +167,48 @@ const getStreamHeaderBits = name => {
 export const getTransferByteCount = () => {
   const name = 'transfer byte count';
   const length = STREAM_HEADERS[name].length;
+  if(length === 0) return 1;
   const bits = getStreamHeaderBits(name);
   return bitsToInt(bits, length);
 }
+export const getTransferByteCountCrc = () => {
+  const name = 'transfer byte count crc';
+  const length = STREAM_HEADERS[name].length;
+  if(length === 0) return 0;
+  const bits = getStreamHeaderBits(name);
+  if(bits.length !== length) return CRC.INVALID;
+  return bitsToInt(bits, length);
+}
+export const getTransferByteCountActualCrc = () => {
+  const countBits = getStreamHeaderBits('transfer byte count').length;
+  if(countBits === 0) return 0;
+
+  const crcBits = getStreamHeaderBits('transfer byte count crc').length;
+  if(crcBits === 0) return 0;
+
+  const count = getTransferByteCount();
+  const bytesOfCount = numberToBytes(count, countBits);
+  return CRC.check(bytesOfCount, crcBits)
+}
+export const isTransferByteCountTrusted = () => {
+  return getTransferByteCountCrc() === getTransferByteCountActualCrc();
+}
+export function getTransferDataCrc() {
+  const name = 'transfer byte crc';
+  const length = STREAM_HEADERS[name].length;
+  if(length === 0) return 0;
+  const bits = getStreamHeaderBits(name);
+  if(bits.length !== length) return CRC.INVALID;
+  return bitsToInt(bits, length);
+}
+export function getTransferActualDataCrc() {
+  const name = 'transfer byte crc';
+  const length = STREAM_HEADERS[name].length;
+  if(length === 0) return 0;
+  const crcBits = getStreamHeaderBits(name).length;
+  const bytes = getDataBytes();
+  return CRC.check(bytes, crcBits);
+}
+export const isTransferDataTrusted = () => {
+  return getTransferDataCrc() === getTransferActualDataCrc();
+}
\ No newline at end of file
diff --git a/converters.js b/converters.js
index bcc510b..2e22d82 100644
--- a/converters.js
+++ b/converters.js
@@ -1,10 +1,63 @@
+export const numberToBytes = (number, bitLength) => {
+  const byteCount = Math.ceil(bitLength/8);
+  const bytes = [];
+  for(let i = 0; i < byteCount; i++) {
+    bytes.push((number >> (8 * (byteCount - 1 - i))) & 0xFF);
+  }
+  return bytes;
+}
+export const numberToHex = (bitLength) => {
+  const digits = Math.ceil(bitLength / 4);
+  return (number) => '0x' + number.toString(16).padStart(digits, '0').toUpperCase();
+}
+
+export function numberToBits(number, bitLength) {
+  const bits = [];
+  for(let i = bitLength - 1; i >= 0; i--)
+    bits.push((number >> i) & 1);
+  return bits;
+}
+export function bytesToText(bytes) {
+  if(!(bytes instanceof ArrayBuffer || ArrayBuffer.isView(bytes))) {
+    bytes = new Uint8Array(bytes).buffer;
+  }
+  return new TextDecoder().decode(bytes);
+}
+export function bytesToBits(bytes) {
+  return bytes.reduce((bits, byte) => [
+      ...bits, 
+      ...byte.toString(2).padStart(8, '0').split('').map(Number)
+    ], []);
+}
+
+export function textToBytes(text) {
+  return new TextEncoder().encode(text);
+}
+export function textToBits(text) {
+  return bytesToBits(textToBytes(text));
+}
+
+export function bitsToText(bits) {
+  const bytes = new Uint8Array(bitsToBytes(bits));
+  return bytesToText(bytes.buffer);
+}
+export function bitsToBytes(bits) {
+  const bytes = [];
+  for(let i = 0; i < bits.length; i+= 8) {
+    bytes.push(parseInt(bits.slice(i, i + 8).join(''), 2));
+  }
+  return bytes;
+}
 export const bitsToInt = (bits, bitLength) => {
-  parseInt(bits
+  if(bits.length === 0) return 0;
+  if(bitLength <= 0) return 0;
+  return parseInt(bits
     // only grab the bits we need
     .slice(0, bitLength)
     // combine into string
     .join('')
     // Assume missing bits were zeros
-    .padEnd(bitLength, '0')
+    .padEnd(bitLength, '0'),
+    2
   );
 }
diff --git a/index.html b/index.html
index 1fa21de..f9504c3 100644
--- a/index.html
+++ b/index.html
@@ -79,7 +79,8 @@
       <h2>Decoded</h2>
       <div>
         Bytes: <span id="received-packet-original-bytes">N/A</span><br>
-        Length CRC-8: <span id="received-packet-original-bytes-crc">N/A</span><br>
+        Length CRC: <span id="received-packet-original-bytes-crc">N/A</span><br>
+        Data CRC: <span id="received-packet-original-data-crc">N/A</span><br>
         <h4>Errors</h4>
         Encoded Segments: <span id="received-raw-bits-error-percent">N/A</span>%<br>
         Encoded Packets: <span id="received-encoded-bits-error-percent">N/A</span>%<br>
diff --git a/index.js b/index.js
index 25dac9d..7867161 100644
--- a/index.js
+++ b/index.js
@@ -16,13 +16,23 @@ import PacketizationPanel from "./Panels/PacketizationPanel";
 import AvailableFskPairsPanel from "./Panels/AvailableFskPairsPanel";
 import FrequencyGraphPanel from "./Panels/FrequencyGraphPanel";
 import GraphConfigurationPanel from './Panels/GraphConfigurationPanel'
+import {
+  bitsToInt,
+  bitsToBytes,
+  bitsToText,
+  bytesToBits,
+  bytesToText,
+  numberToBytes,
+  numberToBits,
+  numberToHex,
+  textToBits,
+  textToBytes,
+} from './converters';
 var audioContext;
 var microphoneStream;
 var microphoneNode;
 var analyser;
 var sentDataTextArea;
-const MAXIMUM_PACKETIZATION_SIZE_BITS = 16;
-const CRC_BIT_COUNT = 8;
 
 // bits as they are sent
 let SENT_ORIGINAL_TEXT = '';
@@ -96,6 +106,10 @@ function handleWindowLoad() {
   signalPanel.setTimeoutMilliseconds(60);
 
   packetizationPanel.setSizePower(5);
+  packetizationPanel.setDataSizePower(16);
+  packetizationPanel.setDataSizeCrc(8);
+  packetizationPanel.setDataCrc(16);
+
   packetizationPanel.setErrorCorrection(true);
   packetizationPanel.setInterleaving(true);
 
@@ -153,6 +167,9 @@ function handleWindowLoad() {
     configurationChanged();
   });
   packetizationPanel.addEventListener('errorCorrectionChange', configurationChanged);
+  packetizationPanel.addEventListener('dataSizePowerChange', configurationChanged);
+  packetizationPanel.addEventListener('dataSizeCrcChange', configurationChanged);
+  packetizationPanel.addEventListener('dataCrcChange', configurationChanged);
 
   availableFskPairsPanel.addEventListener('change', (event) => {
     frequencyGraphPanel.setFskPairs(event.selected);
@@ -252,6 +269,10 @@ function updateStreamManager() {
   StreamManager.setPacketEncoding(
     packetizationPanel.getErrorCorrection() ? HammingEncoding : undefined
   );
+  const xferCountLength = packetizationPanel.getDataSizePower();
+  const xferCountCrcLength = xferCountLength === 0 ? 0 : packetizationPanel.getDataSizeCrc();
+  const xferCrcLength = packetizationPanel.getDataCrc();
+
   StreamManager.changeConfiguration({
     bitsPerPacket: PacketUtils.getPacketMaxBitCount(),
     segmentsPerPacket: PacketUtils.getPacketSegmentCount(),
@@ -259,11 +280,15 @@ function updateStreamManager() {
     streamHeaders: {
       'transfer byte count': {
         index: 0,
-        length: MAXIMUM_PACKETIZATION_SIZE_BITS
+        length: xferCountLength
       },
       'transfer byte count crc': {
-        index: MAXIMUM_PACKETIZATION_SIZE_BITS,
-        length: CRC_BIT_COUNT
+        index:  xferCountLength,
+        length: xferCountCrcLength
+      },
+      'transfer byte crc': {
+        index:  xferCountLength + xferCountCrcLength,
+        length: xferCrcLength
       },
     }
   });
@@ -276,8 +301,9 @@ function updatePacketUtils() {
   PacketUtils.changeConfiguration({
     segmentDurationMilliseconds: signalPanel.getSegmentDurationMilliseconds(),
     packetSizeBitCount: packetizationPanel.getSizePower(),
-    dataSizeBitCount: MAXIMUM_PACKETIZATION_SIZE_BITS,
-    dataSizeCrcBitCount: CRC_BIT_COUNT,
+    dataSizeBitCount: packetizationPanel.getDataSizePower(),
+    dataSizeCrcBitCount: packetizationPanel.getDataSizeCrc(),
+    dataCrcBitCount: packetizationPanel.getDataCrc(),
     bitsPerSegment,
     packetEncoding: packetizationPanel.getErrorCorrection(),
     packetEncodingBitCount: ERROR_CORRECTION_BLOCK_SIZE,
@@ -375,22 +401,20 @@ function percentInFrequency(hz, frequencyResolution) {
   return percent;
 }
 
-function logSent(text) {
-  // display what is being sent
-  sentDataTextArea.value += text + '\n';
-  sentDataTextArea.scrollTop = sentDataTextArea.scrollHeight;
-}
-
 function sendBytes(bytes) {
   const byteCount = bytes.length;
   if(byteCount === 0) {
-    logSent('Nothing to send!');
+    document.getElementById('sent-data').innerText = 'Nothing to send!';
     return;
-  } else if(byteCount > 0xFFFF) {
-    logSent('Too much to send!');
+  } else if(byteCount > packetizationPanel.getDataSize()) {
+    document.getElementById('sent-data').innerText = `Attempted to send too much data. Limit is ${Humanize.byteSize(packetizationPanel.getDataSize())}. Tried to send ${Humanize.byteSize(byteCount)}`;
     return;
   }
 
+  AudioReceiver.reset();
+  StreamManager.reset();
+  frequencyGraphPanel.start();
+
   const bits = bytesToBits(bytes);
 
   SENT_ORIGINAL_TEXT = bytesToText(bytes);
@@ -398,12 +422,44 @@ function sendBytes(bytes) {
 
   // packetization headers
   // data length
-  const dataLengthBits = numberToBits(bytes.length, MAXIMUM_PACKETIZATION_SIZE_BITS);
-  // crc on data length
-  const dataLengthCrcBits = numberToBits(CRC.check(bitsToBytes(dataLengthBits), CRC_BIT_COUNT), CRC_BIT_COUNT);
+  let dataLengthBits = [];
+  let dataLengthCrcBits = [];
+  let dataSizeCrcNumber = 0;
+  const dataLengthBitLength = packetizationPanel.getDataSizePower();
+  if(dataLengthBitLength !== 0) {
+    dataLengthBits = numberToBits(bytes.length, dataLengthBitLength);
+
+    // crc on data length
+    const dataSizeCrcBitLength = packetizationPanel.getDataSizeCrc();
+    if(dataSizeCrcBitLength !== 0) {
+      const bytes = bitsToBytes(dataLengthBits);
+      dataSizeCrcNumber = CRC.check(bytes, dataSizeCrcBitLength);
+      dataLengthCrcBits = numberToBits(dataSizeCrcNumber, dataSizeCrcBitLength);
+    }
+  } 
+
+  // crc on data
+  let dataCrcBits = [];
+  const dataCrcBitLength = packetizationPanel.getDataCrc();
+  let dataCrcNumber = 0;
+  if(dataCrcBitLength !== 0) {
+    dataCrcNumber = CRC.check(bytes, dataCrcBitLength);
+    dataCrcBits = numberToBits(dataCrcNumber, dataCrcBitLength);
+  } 
+  console.log('sending headers', {
+    // dataLengthBits,
+    // dataLengthCrcBits,
+    // dataCrcBits,
+    dataCrcHex: numberToHex(packetizationPanel.getDataCrc())(dataCrcNumber),
+    dataSizeCrcHex: numberToHex(packetizationPanel.getDataSizeCrc())(dataSizeCrcNumber),
+  })
 
   // prefix with headers
-  bits.unshift(...dataLengthBits, ...dataLengthCrcBits);
+  bits.unshift(
+    ...dataLengthBits,
+    ...dataLengthCrcBits,
+    ...dataCrcBits
+  );
 
   const bitCount = bits.length;
 
@@ -418,13 +474,10 @@ function sendBytes(bytes) {
   const packetCount = PacketUtils.getPacketCount(bitCount);
   const totalDurationSeconds = PacketUtils.getDataTransferDurationSeconds(bitCount);
 
-  const errorCorrectionBits = [];
-
   AudioSender.beginAt(startSeconds);
   // send all packets
   for(let i = 0; i < packetCount; i++) {
     let packet = PacketUtils.getPacketBits(bits, i);
-    errorCorrectionBits.push(...packet);
     SENT_ENCODED_BITS.push(...packet);
     if(packet.length > packetBitCount) {
       console.error('Too many bits in the packet. tried to send %s, limited to %s', packet.length, packetBitCount);
@@ -522,40 +575,30 @@ function resumeGraph() {
   }
 }
 
-function getTransferredCorrectedBits() {
-  const bits = [];
-  const packetCount = StreamManager.getPacketReceivedCount();
-  for(let packetIndex = 0; packetIndex < packetCount; packetIndex++) {
-    let packetBits = StreamManager.getPacketBits(packetIndex);
-    if(packetizationPanel.getErrorCorrection()) {
-      bits.push(...HammingEncoding.decode(packetBits));
-    } else {
-      bits.push(...packetBits);
-    }
-  }
-  return bits;
-}
-
 function handleStreamManagerChange() {
   const channelCount = availableFskPairsPanel.getSelectedFskPairs().length;
   let allRawBits = StreamManager.getStreamBits();
   let allEncodedBits = StreamManager.getAllPacketBits();
-  let allDecodedBits = getTransferredCorrectedBits();
+  let allDecodedBits = StreamManager.getAllPacketBitsDecoded();
 
   // get packet data before removing decoded bits
-  const transmissionByteCount = parseTransmissionByteCount(allDecodedBits);
-  const transmissionByteCountCrc = parseTransmissionByteCountCrc(allDecodedBits)
-  const transmissionByteCountActualCrc = CRC.check(
-    bitsToBytes(
-      numberToBits(
-        transmissionByteCount,
-        MAXIMUM_PACKETIZATION_SIZE_BITS
-      )
-    ), CRC_BIT_COUNT
-  );
-  const trustedLength = transmissionByteCountCrc === transmissionByteCountActualCrc;
+  const transmissionByteCount = StreamManager.getTransferByteCount();
+  const transmissionByteCountCrc = StreamManager.getTransferByteCountCrc();
+  const transmissionByteCountActualCrc = StreamManager.getTransferByteCountActualCrc();
+
+  const trustedLength = StreamManager.isTransferByteCountTrusted();
   const totalBitsTransferring = parseTotalBitsTransferring(allDecodedBits);
 
+  const transmissionDataCrc = StreamManager.getTransferDataCrc();
+  const transmissionDataActualCrc = StreamManager.getTransferActualDataCrc();
+  const transmissionCrc = document.getElementById('received-packet-original-data-crc');
+  transmissionCrc.innerText = numberToHex(packetizationPanel.getDataCrc())(transmissionDataCrc);
+  const trustedData = StreamManager.isTransferDataTrusted();
+  transmissionCrc.className = trustedData ? 'bit-correct' : 'bit-wrong';
+  if(!trustedData) {
+    transmissionCrc.innerText += ' (Expected ' + numberToHex(packetizationPanel.getDataCrc())(transmissionDataActualCrc) + ')';
+  }
+
   // reduce all decoded bits based on original data sent
   allDecodedBits = removeDecodedHeadersAndPadding(allDecodedBits);
 
@@ -604,10 +647,10 @@ function handleStreamManagerChange() {
     '');
   document.getElementById('received-packet-original-bytes').innerText = transmissionByteCount.toLocaleString();
   const packetCrc = document.getElementById('received-packet-original-bytes-crc');
-  packetCrc.innerText = '0x' + asHex(2)(transmissionByteCountCrc);
+  packetCrc.innerText = numberToHex(packetizationPanel.getDataSizeCrc())(transmissionByteCountCrc);
   packetCrc.className = trustedLength ? 'bit-correct' : 'bit-wrong';
   if(!trustedLength) {
-    packetCrc.innerText += ' (Expected 0x' + asHex(2)(transmissionByteCountActualCrc) + ')';
+    packetCrc.innerText += ' (Expected ' + numberToHex(packetizationPanel.getDataSizeCrc())(transmissionByteCountActualCrc) + ')';
   }
 
   document.getElementById('received-encoded-bits-error-percent').innerText = (
@@ -619,44 +662,23 @@ function handleStreamManagerChange() {
   document.getElementById('received-decoded-bits-error-percent').innerText = (
     Math.floor((1 - (correctedDecodedBits / allDecodedBits.length)) * 10000) * 0.01
   ).toLocaleString();
-  // ArrayBuffer / ArrayBufferView
-  const receivedText = bitsToText(allDecodedBits);
+
+  const bytes = StreamManager.getDataBytes();
+  const receivedText = bytesToText(bytes);
+
   messagePanel.setReceived(
     receivedText.split('').reduce(textExpectorReducer(SENT_ORIGINAL_TEXT), '')
   );
 }
-function asHex(length) {
-  return (number) => number.toString(16).padStart(length, '0').toUpperCase();
-}
-function parseDataTransferDurationMilliseconds() {
-  const decodedBits = getTransferredCorrectedBits();
-  const byteCount = parseTransmissionByteCount(decodedBits);
-  return PacketUtils.getDataTransferDurationMillisecondsFromByteCount(byteCount);
-}
 function parseTotalBitsTransferring() {
-  const dataByteCount = parseTransmissionByteCount();
+  const dataByteCount = StreamManager.getTransferByteCount();
   const bitCount = PacketUtils.getPacketizationBitCountFromByteCount(dataByteCount);
   const segments = getTotalSegmentCount(bitCount);
   return segments * availableFskPairsPanel.getSelectedFskPairs().length;
 }
-function parseTransmissionByteCountCrc() {
-  let decodedBits = getTransferredCorrectedBits();
-  const offset = MAXIMUM_PACKETIZATION_SIZE_BITS;
-  decodedBits = decodedBits.slice(offset, offset + CRC_BIT_COUNT);
-  return bitsToInt(decodedBits, CRC_BIT_COUNT);
-}
-function parseTransmissionByteCount() {
-  let decodedBits = getTransferredCorrectedBits();
-  decodedBits = decodedBits.slice(0, MAXIMUM_PACKETIZATION_SIZE_BITS);
-  while(decodedBits.length < MAXIMUM_PACKETIZATION_SIZE_BITS) {
-    // assume maximum value possible
-    // until we have enough bits to find the real size
-    decodedBits.push(1);
-  }
-  return bitsToInt(decodedBits, MAXIMUM_PACKETIZATION_SIZE_BITS);
-}
+
 function removeEncodedPadding(bits) {
-  const sizeBits = MAXIMUM_PACKETIZATION_SIZE_BITS;
+  const sizeBits = packetizationPanel.getDataSizePower();
   const dataSize = ERROR_CORRECTION_DATA_SIZE;
   const blockSize = ERROR_CORRECTION_BLOCK_SIZE;
   let bitsNeeded = sizeBits;
@@ -675,7 +697,10 @@ function removeEncodedPadding(bits) {
   const dataByteCount = StreamManager.getTransferByteCount();
 
   // determine how many decoded bits need to be sent (including the size)
-  const totalBits = (dataByteCount * 8) + MAXIMUM_PACKETIZATION_SIZE_BITS + CRC_BIT_COUNT;
+  let totalBits = (dataByteCount * 8);
+  totalBits += packetizationPanel.getDataSizePower();
+  if(packetizationPanel.getDataSizePower() !== 0) totalBits += packetizationPanel.getDataSizeCrc();
+  totalBits += packetizationPanel.getDataCrc();
   let encodingBitCount = totalBits;
   if(packetizationPanel.getErrorCorrection()) {
     const blocks = Math.ceil(encodingBitCount / dataSize);
@@ -691,17 +716,51 @@ function removeEncodedPadding(bits) {
   return bits;
 }
 function removeDecodedHeadersAndPadding(bits) {
-  const sizeBits = MAXIMUM_PACKETIZATION_SIZE_BITS;
-  let bitCount = bits.length / 8;
-  if(bits.length >= sizeBits) {
-    bitCount = bitsToInt(bits.slice(0, sizeBits), sizeBits);
+  const sizeBitCount = packetizationPanel.getDataSizePower();
+  const sizeCrcBitCount = packetizationPanel.getDataSizeCrc();
+  const dataCrcBitCount = packetizationPanel.getDataCrc();
+  let byteCount;
+  let offset = 0;
+  if(sizeBitCount !== 0) {
+    offset += sizeBitCount;
+    // header bits only?
+    if(bits.length <= offset) return [];
+    byteCount = bitsToInt(bits.slice(0, sizeBitCount), sizeBitCount);
+    if(sizeCrcBitCount !== 0) {
+      offset += sizeBitCount;
+      // header bits only?
+      if(bits.length <= offset) return [];
+      let countCrc = bitsToInt(bits.slice(sizeBitCount, sizeBitCount + sizeCrcBitCount), sizeCrcBitCount);
+      let actualCountCrc = CRC.check(numberToBytes(sizeCrcBitCount, sizeBitCount), sizeCrcBitCount);
+      // can we trust the size?
+      if(countCrc !== actualCountCrc) {
+        if(dataCrcBitCount !== 0) {
+          offset += dataCrcBitCount;
+          if(bits.length <= offset) return [];
+        }
+        // Change based off of header bits
+        byteCount = (bits.length - offset) / 8;
+      }
+    } else if(dataCrcBitCount !== 0) {
+      offset += dataCrcBitCount;
+      if(bits.length <= offset) return [];
+    }
+    // remove headers and excessive bits
+    const bitCount = byteCount * 8;
+    return bits.slice(offset, offset + bitCount).splice(bitCount);
+  } else {
+    // size not included. Means 1 byte max
+    // crc not valid on size
+    // crc valid on byte
+    const dataCrcBitCount = packetizationPanel.getDataCrc();
+    if(dataCrcBitCount === 0) {
+      // bits are pure data for 1 byte
+      return bits.slice(0, 8);
+    } else {
+      // get byte after data crc
+      return bits.slice(dataCrcBitCount, dataCrcBitCount + 8);
+    }
   }
-  // remove size and crc header
-  bits.splice(0, sizeBits + CRC_BIT_COUNT);
-
-  // remove excessive bits
-  bits.splice(bitCount * 8);
-  return bits;
 }
 const bitReducer = (packetBitSize, blockSize, blockCallback) => (all, bit, i)  => {
   const packetIndex = Math.floor(i / packetBitSize);
@@ -780,63 +839,10 @@ function getAudioContext() {
   }
   return audioContext;
 }
-function bitsToInt(bits, bitLength) {
-  // only grab the bits we need
-  const bitString = bits.slice(0, bitLength)
-    // combine into string
-    .join('')
-    // Assume missing bits were zeros
-    .padEnd(bitLength, '0');
-  // parse as int
-  return parseInt(bitString, 2);
-}
-function intToBytes(int, bitLength) {
-  const byteCount = Math.ceil(bitLength/8);
-  const bytes = [];
-  for(let i = 0; i < byteCount; i++) {
-    bytes.push((int >> (8 * (byteCount - 1 - i))) & 0xFF);
-  }
-  return bytes;
-}
-function numberToBits(number, bitLength) {
-  const bits = [];
-  for(let i = bitLength - 1; i >= 0; i--)
-    bits.push((number >> i) & 1);
-  return bits;
-}
-function bytesToText(bytes) {
-  return new TextDecoder().decode(bytes);
-}
-function textToBytes(text) {
-  return new TextEncoder().encode(text);
-}
-function bytesToBits(bytes) {
-  return bytes.reduce((bits, byte) => [
-      ...bits, 
-      ...byte.toString(2).padStart(8, '0').split('').map(Number)
-    ], []);
-}
-function bitsToBytes(bits) {
-  const bytes = [];
-  for(let i = 0; i < bits.length; i+= 8) {
-    bytes.push(parseInt(bits.slice(i, i + 8).join(''), 2));
-  }
-  return bytes;
-}
-function textToBits(text) {
-  return bytesToBits(textToBytes(text));
-}
-function bitsToText(bits) {
-  const bytes = new Uint8Array(bitsToBytes(bits));
-  return bytesToText(bytes.buffer);
-}
 function handleSendButtonClick() {
   if(messagePanel.getSendButtonText() === 'Stop') {
     AudioSender.stop();
   } else {
-    AudioReceiver.reset();
-    StreamManager.reset();
-    frequencyGraphPanel.start();
     const text = messagePanel.getMessage();
     sendBytes(textToBytes(text));
   }