Encoders

Hex Encoder/Decoder

Convert text to hexadecimal and vice versa online free

Text Input

XOR Key (0-255):

About

Converts text to hexadecimal and hex back to text with multiple formatting options including lowercase, uppercase, space-separated, continuous, and 0x-prefixed. Shows binary and decimal values per byte alongside the hex output, displays byte offsets for file analysis, converts files to hex, and supports XOR operations with a key for basic encryption.

Developers working with binary data, network protocols, or low-level debugging often need to inspect or manipulate hex representations, but existing tools are too simple or CLI-based. This tool provides a complete hex workspace with multiple views and XOR operations in a visual interface.

Who should use this tool?

Embedded systems engineers, network protocol developers, reverse engineers, and anyone working with binary file formats or low-level data inspection.

Common use cases

Convert a binary file to hex for manual inspection of magic bytes or headers
Decode a hex string from a network protocol dump back into readable text
Analyze byte-by-byte with the binary and decimal column to understand flag bits in a protocol
Apply XOR with a key to obfuscated data in a CTF challenge or malware analysis
View byte offsets while inspecting a file to identify specific positions in the data structure

How to Use

Type or paste text in the input area to see its hex representation update in real time

Choose output format: lowercase, uppercase, space-separated, continuous (no spaces), or 0x-prefixed (e.g. 0xFF)

Toggle the binary and decimal column to see per-byte values in both binary and decimal formats

Enable byte offsets to see the position of each byte in the sequence for file analysis

Switch to file-to-hex mode by dragging a file onto the area to convert its entire content

Enter a XOR key value to apply bitwise XOR to each byte for basic obfuscation or deobfuscation

Examples

Input: 'Hello' with uppercase space-separated. Output: '48 65 6C 6C 6F' with binary column showing '01001000 01100101 01101100 01101100 01101111'

Input: '48656C6C6F' (continuous mode) with hex-to-text. Output: 'Hello'

Best Practices

Use 0x-prefixed format when writing C/C++ byte arrays or embedded firmware constants
Enable binary column when analyzing protocol flag bytes to see individual bit values
Use XOR with care; repeat the key length across data and use the same key to reverse
File-to-hex mode is ideal for inspecting file headers without needing a full hex editor

Common Mistakes

Confusing the hex-to-text direction; always confirm which conversion mode is active
Applying XOR with a key that contains non-hex characters without proper encoding
Using continuous mode output to paste into a tool that expects space-separated hex bytes
Not accounting for byte order (endianness) when interpreting multi-byte hex values

FAQ

Can I convert large files to hex? Yes, but very large files may take time; the tool processes in chunks.

What does XOR with a key do? It applies a bitwise exclusive-or of each byte with the key byte for obfuscation.

Does the tool handle UTF-8 characters? Yes, multi-byte UTF-8 characters are properly encoded to hex.

Can I switch between text-to-hex and hex-to-text without clearing input? Yes, the conversion is bidirectional.

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Learning Resources

Dive deeper with our comprehensive guides and tutorials.

Hex Encoder/Decoder - Beginner's Guide

5 min read

Hex Encoder/Decoder Advanced Techniques

8 min read

About

Who should use this tool?

Embedded systems engineers, network protocol developers, reverse engineers, and anyone working with binary file formats or low-level data inspection.

Common use cases

Convert a binary file to hex for manual inspection of magic bytes or headers
Decode a hex string from a network protocol dump back into readable text
Analyze byte-by-byte with the binary and decimal column to understand flag bits in a protocol
Apply XOR with a key to obfuscated data in a CTF challenge or malware analysis
View byte offsets while inspecting a file to identify specific positions in the data structure

How to Use

Type or paste text in the input area to see its hex representation update in real time

Choose output format: lowercase, uppercase, space-separated, continuous (no spaces), or 0x-prefixed (e.g. 0xFF)

Toggle the binary and decimal column to see per-byte values in both binary and decimal formats

Enable byte offsets to see the position of each byte in the sequence for file analysis

Switch to file-to-hex mode by dragging a file onto the area to convert its entire content

Enter a XOR key value to apply bitwise XOR to each byte for basic obfuscation or deobfuscation

Best Practices

Use 0x-prefixed format when writing C/C++ byte arrays or embedded firmware constants

Enable binary column when analyzing protocol flag bytes to see individual bit values

Use XOR with care; repeat the key length across data and use the same key to reverse

File-to-hex mode is ideal for inspecting file headers without needing a full hex editor

Common Mistakes

Confusing the hex-to-text direction; always confirm which conversion mode is active

Applying XOR with a key that contains non-hex characters without proper encoding

Using continuous mode output to paste into a tool that expects space-separated hex bytes

Not accounting for byte order (endianness) when interpreting multi-byte hex values

FAQ

Can I convert large files to hex? Yes, but very large files may take time; the tool processes in chunks.

What does XOR with a key do? It applies a bitwise exclusive-or of each byte with the key byte for obfuscation.

Does the tool handle UTF-8 characters? Yes, multi-byte UTF-8 characters are properly encoded to hex.

Can I switch between text-to-hex and hex-to-text without clearing input? Yes, the conversion is bidirectional.

Hex Encoder/Decoder

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Encoders

Base64 Encoder/Decoder

URL Encoder/Decoder

Base64 Image Converter

String Escape/Unescape

Popular Tools

JSON Formatter

JWT Decoder

SQL Formatter

Learning Resources

Share

Hex Encoder/Decoder

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Encoders

Base64 Encoder/Decoder

URL Encoder/Decoder

Base64 Image Converter

String Escape/Unescape

Popular Tools

JSON Formatter

JWT Decoder

SQL Formatter

Learning Resources

Share