Character Encoding Suite•Text to Decimal & Byte Translation

ASCII Text to Decimal Converter

Turn readable text, characters, and sentences into decimal codes and byte streams. Includes flexible delimiter formatting, multi-byte UTF-8 analysis, and full ASCII reference lookup charts.

Ready13 characters

ASCII Text Input13 characters

Delimiter & Options▼

Output Delimiter

Character Encoding

Strict ASCII Validation

Error on non-ASCII characters (>127) instead of fallback conversion.

Quick Presets:

Decimal Numbers Output13 decimal codes

72 101 108 108 111 44 32 87 111 114 108 100 33

Total Codes13

Characters13

Bytes (UTF-8)13

Control Codes0

🔍 Character-by-Character Diagnostics Breakdown

Showing 13 of 13 tokens

#	Character	Decimal	Hex (0x)	Binary (8-bit)	Type	Description

ASCII Text to Decimal Translation Step-by-Step Proof

Type any decimal value above to generate step-by-step arithmetic proof.

Complete Standard ASCII Reference Chart (0–127)

Cross-reference characters, decimal numbers, hex notation, and binary forms.

Character	Decimal	Hex (0x)	Binary	Category	Description
NUL	0	0x00	00000000	Control	Null character
\t (HT)	9	0x09	00001001	Control	Horizontal Tab
\n (LF)	10	0x0A	00001010	Control	Line Feed (Newline)
\r (CR)	13	0x0D	00001101	Control	Carriage Return
[Space]	32	0x20	00100000	Printable	Standard Space
!	33	0x21	00100001	Printable	Exclamation mark
0	48	0x30	00110000	Digit	Digit Zero
9	57	0x39	00111001	Digit	Digit Nine
A	65	0x41	01000001	Uppercase	Latin Capital A
B	66	0x42	01000010	Uppercase	Latin Capital B
Z	90	0x5A	01011010	Uppercase	Latin Capital Z
a	97	0x61	01100001	Lowercase	Latin Small a
z	122	0x7A	01111010	Lowercase	Latin Small z
~	126	0x7E	01111110	Printable	Tilde
DEL	127	0x7F	01111111	Control	Delete character

What is ASCII Text to Decimal Conversion?

ASCII to Decimal conversion transforms human-readable text characters into their base-10 numerical representations as established by the American Standard Code for Information Interchange (ASCII).

Since digital processors operate purely on electrical voltages and binary states (0 and 1), each character must correspond to a specific integer code. In standard 7-bit ASCII, every English letter, number, and punctuation symbol is assigned a decimal value between 0 and 127. For instance:

Letter 'A' = Decimal 65

Binary: 01000001 | Hex: 0x41 | Octal: 0101

Letter 'a' = Decimal 97

Binary: 01100001 | Hex: 0x61 | Octal: 0141

Digit '0' = Decimal 48

Binary: 00110000 | Hex: 0x30 | Octal: 0060

How to Convert ASCII Text to Decimal Manually

Converting text to decimal numbers by hand is straightforward using these three steps:

Split the String into Individual Characters: Take your input string (e.g. "Code") and break it into characters: ['C', 'o', 'd', 'e'].
Lookup Each Character in the ASCII Table:
- 'C' (Uppercase C) → Decimal 67
- 'o' (Lowercase o) → Decimal 111
- 'd' (Lowercase d) → Decimal 100
- 'e' (Lowercase e) → Decimal 101
Format Output with Delimiters: Join the numbers using your desired separator: 67 111 100 101 or as an array [67, 111, 100, 101].

💡 Programming Tip: Getting ASCII / Character Codes in Code

In JavaScript/TypeScript: "A".charCodeAt(0) // 65 • In Python: ord('A') # 65 • In C/C++: (int)'A' // 65.

Practical Engineering & Developer Use Cases

🔌 Serial UART & Microcontroller Firmware

Engineers working with Arduino, ESP32, or STM32 write string buffers as decimal byte arrays (e.g. byte buf[] = 105) to stream packets over serial or I2C.

🔒 Security, Obfuscation & CTF Challenges

Penetration testers and reverse engineers convert payloads into decimal char arrays to bypass naive web-application firewalls or analyze obfuscated script strings.

🌐 Network Packet & Protocol Debugging

Inspect decimal byte sequences captured from raw socket buffers, database SQL fields, or custom binary communication protocols.

📚 Educational Unit Testing & Test Fixtures

Prepare deterministic mock fixtures and byte arrays for unit test suites without needing complex byte-encoding boilerplate.

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Frequently Asked Questions (FAQ)

Everything you need to know about converting ASCII text to decimal numbers, encodings, and delimiters.

01How do you convert ASCII text into decimal numbers?▼

To convert ASCII text into decimal numbers, each character is looked up in the standard ASCII table to find its corresponding 7-bit or 8-bit integer code. For example, in the word 'Hi', the uppercase letter 'H' has an ASCII decimal value of 72, and the lowercase letter 'i' has an ASCII decimal value of 105. The resulting decimal representation is 72 105.

02What output delimiter formats can I choose?▼

You can format your decimal output using standard Space (72 105), Comma (72,105), Comma + Space (72, 105), Line Breaks, Semicolons, HTML Entities (Hi), Programming Array format ([72, 105]), continuous digits (no delimiter), or a custom user-defined delimiter.

03How does UTF-8 multi-byte encoding differ from Unicode code points?▼

Standard ASCII characters (0–127) have identical decimal values in ASCII, UTF-8, and Unicode. However, non-ASCII characters like '€' or accented letters occupy multiple bytes in UTF-8: UTF-8 Bytes Mode outputs 3 separate decimal bytes (226 130 172), whereas Unicode Code Points Mode outputs the single code point integer (8364).

04Can I convert large text files or binary payloads?▼

Yes. You can upload .txt files directly into the converter, copy the decimal stream with one click, or export the resulting decimal values as a downloadable file without sending any data over the network.

05How do I reverse decimal numbers back into ASCII text?▼

You can click the Swap (⇄) button in the converter card to instantly toggle into Decimal to ASCII mode, or visit our companion Decimal to ASCII Converter.

06What are ASCII control characters and how are they converted?▼

Characters with decimal codes 0 to 31 and 127 are non-printable control characters (such as NUL, Tab, Line Feed, and Carriage Return). Our converter converts control characters into their precise decimal values (e.g. newline \n = 10, carriage return \r = 13, tab \t = 9) and identifies them in the diagnostics breakdown.