diff --git a/extensions/essentials/src/binary-slice.ts b/extensions/essentials/src/binary-slice.ts
index dbf8048..bee1f89 100644
--- a/extensions/essentials/src/binary-slice.ts
+++ b/extensions/essentials/src/binary-slice.ts
@@ -68,7 +68,7 @@ const execute: OperationExecuteExport = (request) => {
 
       // Transform the array of bytes to an array of bits and slice them
       // precisely to create the bit slice
-      const bitSlice = transformUnitSize(byteSlice, 8, 1).slice(
+      const bitSlice = transformUnitSize(byteSlice, 8, 1, true).slice(
         bitSliceArgs.start - byteSliceStart * 8,
         bitSliceArgs.end - byteSliceStart * 8
       )
@@ -76,7 +76,7 @@ const execute: OperationExecuteExport = (request) => {
       // Fill up the first byte with zero bits and turn the bits back into bytes
       const paddingBits = bitSlice.length % 8 > 0 ? 8 - bitSlice.length % 8 : 0
       const sliceBitsPadded = new Array(paddingBits).fill(0).concat(bitSlice)
-      const sliceBytes = transformUnitSize(sliceBitsPadded, 1, 8)
+      const sliceBytes = transformUnitSize(sliceBitsPadded, 8, 1, false)
       slice = new Uint8Array(sliceBytes).buffer
       break
     }
diff --git a/extensions/essentials/src/binary-to-text.ts b/extensions/essentials/src/binary-to-text.ts
index a80ee86..2e54987 100644
--- a/extensions/essentials/src/binary-to-text.ts
+++ b/extensions/essentials/src/binary-to-text.ts
@@ -149,7 +149,7 @@ const execute: OperationExecuteExport = (request) => {
     ))
 
     // Transform unit size (encode)
-    const encodedUnits = transformUnitSize(units, inUnitSize, outUnitSize)
+    const encodedUnits = transformUnitSize(units, inUnitSize, outUnitSize, true)
     const encodedCodePoints = encodedUnits.map(unit => alphabet[unit])
 
     // Apply padding
@@ -195,7 +195,7 @@ const execute: OperationExecuteExport = (request) => {
     encodedUnits = encodedUnits.slice(0, j)
 
     // Transform unit size (decode)
-    const units = transformUnitSize(encodedUnits, outUnitSize, inUnitSize)
+    const units = transformUnitSize(encodedUnits, inUnitSize, outUnitSize, false)
     const buffer = Uint8Array.from(units).buffer
 
     // Add an issue if foreign characters were encountered
diff --git a/extensions/essentials/src/lib/binary.ts b/extensions/essentials/src/lib/binary.ts
index f0b92d4..212b0c5 100644
--- a/extensions/essentials/src/lib/binary.ts
+++ b/extensions/essentials/src/lib/binary.ts
@@ -75,7 +75,8 @@ export const isBigEndianEnvironment = (): boolean =>
 export const transformUnitSize = (
   inputUnits: number[],
   inUnitSize: number,
-  outUnitSize: number
+  outUnitSize: number,
+  forward: boolean
 ): number[] => {
   if (inUnitSize === outUnitSize) {
     return inputUnits
@@ -84,11 +85,18 @@ export const transformUnitSize = (
     return []
   }
 
+  // Some bits may not hold any information when decoding, see issue #40
+  if (!forward) {
+    [inUnitSize, outUnitSize] = [outUnitSize, inUnitSize]
+  }
+
   const commonSize = lcm(inUnitSize, outUnitSize)
   const inUnits = commonSize / inUnitSize
   const outUnits = commonSize / outUnitSize
 
-  const outputUnitsLength = Math.ceil((outUnits * inputUnits.length) / inUnits)
+  const outputUnitsLength = forward
+    ? Math.ceil((outUnits * inputUnits.length) / inUnits)
+    : Math.floor((outUnits * inputUnits.length) / inUnits)
   const outputUnits = new Array<number>(outputUnitsLength)
 
   let remainingInBits, inUnit, moveBits
@@ -104,6 +112,12 @@ export const transformUnitSize = (
       // If the current out unit is full, move to the next one
       if (remainingOutBits === 0) {
         outputUnits[o++] = outUnit
+        // If the remaining input bits contain no information, don't add a null unit (only occurs when decoding)
+        // TODO: This works, but I, anderium, don't like that this `if` executes on each iteration.
+        if (o === outputUnitsLength) {
+          o--
+          break
+        }
         outUnit = 0
         remainingOutBits = outUnitSize
       }