BIT↔ Bit Manipulation Utility

Bit Order Reversal Calculator

Reverse bit order within individual bytes, reverse an entire bitstream or reverse byte order while preserving the bits inside each byte. Enter binary, hexadecimal or decimal byte values and inspect the exact before-and-after transformation.

✓ Reverse Bits per Byte ✓ Reverse Bitstream ✓ Reverse Byte Order ✓ Binary Input ✓ Hex Input ✓ Decimal Bytes

REV

Bit Order Reversal

● Ready

Input Bytes Enter 8-bit binary bytes. Example: 00000001 10110000.

Reversal Options

Input Format

Reversal Operation

Output Format

Important: Bit reversal and byte-order reversal are different operations. For byte 00000001, bit reversal produces 10000000. Reversing byte order changes the positions of whole bytes but leaves their internal bits unchanged.

Bit Reversal Result Calculated

Reversed Binary —

Bytes —

Total Bits —

Input Hex —

Output Hex —

Input Decimal —

Output Decimal —

Operation —

Status —

Original Binary —

Byte-by-Byte Reversal Breakdown —

Calculation Details —

Bit Order Reversal Calculator

The Bit Order Reversal Calculator reverses the order of binary bits in byte-oriented data. It can reverse the eight bits inside every byte, reverse all bits across an entire multi-byte stream or reverse only the order of the bytes.

These operations are often confused because they may produce related results for some inputs, but they represent different transformations. This calculator keeps them separate and shows the original and resulting binary, hexadecimal and decimal byte values.

The tool is useful for embedded programming, serial protocols, hardware interfaces, signal processing, binary file analysis, register conversion, bit-oriented algorithms and debugging data where MSB-first and LSB-first representations differ.

How to Reverse Bit Order

Choose the input format and enter one or more complete bytes. Select the required reversal operation and choose how the result should be displayed.

Input:
00000001

Reverse bits inside byte:
10000000

Hex:
01 → 80

Decimal:
1 → 128

The leftmost bit becomes the rightmost bit, the second bit becomes the second bit from the right and so on until all eight positions have been reversed.

Reverse Bits Inside Each Byte

Per-byte bit reversal keeps every byte in its original position while reversing the eight bit positions inside that byte.

Input:
00000001 10110000

Byte 1:
00000001 → 10000000

Byte 2:
10110000 → 00001101

Result:
10000000 00001101

This operation is frequently used when converting between MSB-first and LSB-first bit representations inside individual bytes.

Reverse an Entire Bitstream

Whole-stream reversal treats every bit in the input as one continuous sequence. The final bit becomes the first bit, the second-to-last becomes the second and so forth.

Input bytes:
00000001 10110000

Continuous input:
0000000110110000

Reversed stream:
0000110110000000

Re-grouped:
00001101 10000000

For multi-byte data, this differs from reversing the bits within each byte because the byte positions are reversed as part of the complete stream transformation.

Reverse Byte Order Only

Byte-order reversal moves complete bytes without changing their internal bit patterns. This is closer to an endian-style byte swap than to bit reversal.

Input:
12 34 AB CD

Reverse byte order:
CD AB 34 12

Internal bits:
unchanged

For example, hexadecimal 12 remains 12. It simply moves to another position in the sequence.

Bit Reversal vs Byte Reversal

Operation	Input	Result
Reverse bits per byte	01 B0	80 0D
Reverse byte order	01 B0	B0 01
Reverse entire bitstream	01 B0	0D 80

The three results are different because they operate on different boundaries.

Bit Reversal Example: 00000001

Original positions:
0 0 0 0 0 0 0 1

Reverse order:
1 0 0 0 0 0 0 0

Binary:
10000000

Hex:
80

Decimal:
128

This example demonstrates why reversing bits is not the same as simply changing numeric endianness.

Bit Reversal Example: A5

Hexadecimal A5 corresponds to binary 10100101. This particular byte is bit-symmetric, so reversing its bits produces the same value.

Hex:
A5

Binary:
10100101

Reversed:
10100101

Result:
A5

A value remaining unchanged after reversal does not mean the calculation failed. Some bit patterns are palindromic.

Bit Reversal Example: 0x96

Hex input:
96

Binary:
10010110

Reverse bits:
01101001

Hex result:
69

Decimal:
150 → 105

MSB-First vs LSB-First Bit Order

MSB means most significant bit, while LSB means least significant bit. Some communication protocols and hardware devices describe transmission or register layouts according to which bit is processed first.

Byte:
10010110

MSB-first displayed order:
1 0 0 1 0 1 1 0

Reversed bit order:
0 1 1 0 1 0 0 1

Result:
01101001

Bit reversal can be useful when a device or algorithm expects bit order opposite to the representation in which the value was originally provided.

Bit Reversal and Endianness Are Not the Same

Endianness normally describes the ordering of bytes within a multi-byte numeric value. Bit order describes the positions or processing order of bits within a byte or bitstream.

Hex bytes:
12 34

Reverse byte order:
34 12

Reverse bits in each byte:
48 2C

Reverse entire 16-bit stream:
2C 48

Using the correct operation is important when working with hardware registers, communication protocols and binary file formats.

Reverse Binary Input

Binary mode accepts complete eight-bit byte groups. Spaces, commas, semicolons, underscores, hyphens and line breaks may be used as separators.

Input:
11110000 00000001

Per-byte reversal:
00001111 10000000

Binary byte groups must contain exactly eight bits so the calculator does not need to guess how incomplete values should be padded.

Reverse Hexadecimal Bytes

Hexadecimal mode makes bit reversal easier when working with registers, packet bytes or data from a hex viewer. Every two-digit hexadecimal byte is first converted to eight bits, reversed and then converted back.

Hex input:
12 96 F0

Binary:
00010010
10010110
11110000

Reversed:
01001000
01101001
00001111

Hex output:
48 69 0F

Reverse Decimal Byte Values

Decimal mode accepts byte values from 0 through 255. The numeric value is converted to an eight-bit binary representation before reversal.

Decimal input:
1 150 240

Binary:
00000001
10010110
11110000

Reversed decimal:
128 105 15

Why Leading Zero Bits Matter

Bit reversal requires a defined width. For byte-oriented reversal, the width is eight bits, so leading zeros are significant.

Decimal:
1

8-bit representation:
00000001

Correct reversal:
10000000

Decimal result:
128

Reversing the text “1” alone would still produce “1”, which is not a valid eight-bit reversal of the byte value 1.

Bit Reversal Lookup Examples

Input Hex	Input Binary	Reversed Binary	Output Hex
01	00000001	10000000	80
02	00000010	01000000	40
0F	00001111	11110000	F0
12	00010010	01001000	48
96	10010110	01101001	69
FF	11111111	11111111	FF

Common Uses for Bit Order Reversal

Bit reversal appears in low-level programming, embedded systems, microcontroller development, serial communication, CRC implementations, digital signal processing, graphics formats and hardware interfaces.

Some devices transmit the least significant bit first even though software commonly displays values with the most significant bit on the left. A bit reversal operation can convert between these representations when required by the protocol.

Typical technical applications

Examples include SPI or serial data analysis, CRC table generation, register interpretation, protocol debugging, bit-packed file formats, lookup-table creation, firmware development and comparing binary values from systems that use different bit-order conventions.

Common Bit Reversal Mistakes

A common mistake is reversing byte order when the specification actually requires the bits inside each byte to be reversed. These transformations produce different results.

Another mistake is dropping leading zeros before reversal. Because byte reversal requires an eight-bit width, every input byte must be considered as exactly eight bits.

It is also important not to assume that every protocol using the term LSB-first requires stored bytes themselves to be reversed. Transmission order, numeric significance and byte storage order are related but separate concepts.

Bit Order Reversal Calculator Limitations and Notes

This calculator is byte oriented. Binary input in Binary Bytes mode must contain complete eight-bit values, while hexadecimal and decimal modes must represent values from 00 through FF or 0 through 255.

The Reverse Entire Bitstream operation uses all input bytes as one continuous sequence and then divides the reversed result back into eight-bit groups.

The tool does not automatically interpret a sequence as a 16-bit, 32-bit or 64-bit integer with a particular endianness. It performs the selected bit or byte transformation directly on the supplied byte array.

Bit Order Reversal Calculator FAQs

What is bit order reversal?

Bit order reversal changes the position of bits so the first bit becomes the last, the second becomes the second-to-last and so on.

What is the reverse of 00000001?

As an eight-bit byte, 00000001 reversed is 10000000, which is hexadecimal 80 and decimal 128.

What is the bit reversal of 0x96?

0x96 is binary 10010110. Reversing its eight bits gives 01101001, which is hexadecimal 69.

What is the bit reversal of 0x01?

0x01 is 00000001 in binary. Its reversed value is 10000000, or 0x80.

Is bit reversal the same as byte swapping?

No. Bit reversal changes bit positions, while byte swapping changes the order of complete bytes.

Is bit reversal the same as changing endianness?

No. Endianness generally concerns byte order in multi-byte values. Bit reversal changes positions of individual bits.

Can I reverse bits inside every byte separately?

Yes. Select Reverse Bits Inside Each Byte. The byte positions remain unchanged while each eight-bit pattern is reversed.

Can I reverse an entire multi-byte bitstream?

Yes. Select Reverse Entire Bitstream. All bits are concatenated, reversed as one sequence and then divided back into eight-bit groups.

Can I reverse only byte order?

Yes. Reverse Byte Order Only moves whole bytes from last to first without changing the bits inside each byte.

Does the calculator support hexadecimal input?

Yes. Select Hexadecimal Bytes and enter values such as 01 96 FF.

Does the calculator support decimal bytes?

Yes. Decimal values between 0 and 255 are supported.

Why are leading zeros required?

Bit reversal depends on width. A byte always contains eight bits, so decimal 1 must be treated as 00000001 before reversal.

Can a byte stay unchanged after bit reversal?

Yes. Symmetric patterns such as 00000000, 11111111 and 10100101 read the same in both directions.

What does MSB-first mean?

MSB-first generally means the most significant bit is processed or transmitted first. The exact meaning depends on the protocol or hardware specification.

What does LSB-first mean?

LSB-first generally means the least significant bit is processed or transmitted first. A specification should be checked to determine whether this requires an actual bit-reversal transformation.