Text Tool Suite Logo

Number Base Converter

Convert between binary, octal, decimal, hex, and ASCII text. Use presets, validate input, and format output with padding, grouping, delimiters, and HEX case.

Quick presets:

Conversion Options

Input

Tokens: 11 • Length: 11

Output

01001000 01100101 01101100 01101100 01101111 00100000 01010111 01101111 01110010 01101100 01100100
TL;DR — convert between binary, octal, decimal, hex, and ASCII in your browser

Paste text or numbers, pick From and To bases, tweak delimiter, grouping, padding, and HEX case, then copy the result. It is fast, private, and ideal for quick checks and byte‑level work.

Number Base Converter – Binary, Decimal, Hex, Octal & ASCII Online Free

Convert numbers between binary (base 2), decimal (base 10), hexadecimal (base 16), and octal (base 8) online. This free number base converter supports custom bases, ASCII character conversion, and formatting with grouping separators and padding for byte-aligned output.

Start by choosing the source and destination systems. You can paste values separated by spaces or commas, or enter a long run of bits and let the tool slice it into 8‑, 16‑, or 32‑bit chunks. Formatting controls make the output easier to scan: pick a delimiter (space, comma, or none), set a grouping size (for example, 4 for nibbles or 8 for bytes), enable byte padding, and choose uppercase or lowercase hex. A swap button flips direction instantly, and live stats show token count and input length so you can sanity‑check data.

Handy presets cover common tasks such as ASCII → Binary (8‑bit), ASCII → Hex, Hex → Binary,Binary → Base 10, and Octal → Decimal. If you are working with structured payloads after converting, you may like the JSON Formatter & Validator to tidy and validate data. For other encodings, try the Base64 Encoder / Decoder. Need unit math instead of number bases? The Unit Converter can help. For demo data and testing, use the Random Number Generator.

Tip for readability: use grouping of four when viewing binary or hex (nibbles) and eight when you are thinking in bytes. Padding makes columns line up, which is useful when comparing outputs from terminals or firmware logs.

Who uses number base conversion?

Developers and computer science students reach for a number base converter when working with:

  • Bitwise operations — AND, OR, XOR, and shift operations are easiest to reason about in binary.
  • Memory addressing — pointers and offsets are routinely expressed in hexadecimal.
  • Color codes — CSS/HTML HEX colors like #FF5733 are base-16 RGB triplets.
  • Unix file permissions — chmod values like 755 or 644 are octal.
  • Protocol and packet analysis — network data and binary file formats require constant base conversion.

Key features

  • Base‑to‑base conversion: Binary ↔ Octal ↔ Decimal ↔ Hex, plus Text (ASCII)
  • Presets for common tasks: ASCII → Binary (8‑bit), ASCII → Hex, Hex → Binary, Binary → Base 10, Octal → Decimal
  • Binary chunk sizes: 8‑bit, 16‑bit, or 32‑bit
  • Output formatting: delimiter, grouping size, byte padding, and HEX case
  • Live validation with clear error messages for invalid tokens
  • Fast and private — 100% client‑side (no uploads)

Tips

  • Use grouping of 4 for nibbles and 8 for bytes to scan binary and hex at a glance.
  • Enable padding for consistent two‑digit hex and eight‑bit binary output.
  • If your binary is a single long string, set a bit length so the tool splits it into bytes or words.
  • For structured cleanup after conversion, open the JSON Formatter.

Frequently asked questions

Does the base converter work offline and keep data private?
Yes. Conversions run in your browser only; nothing is uploaded.
Can I convert binary to decimal and decimal to binary?
Yes. Choose Binary ↔ Decimal and set bit length and padding as needed.
Does it support octal conversions?
Yes. Pick Octal as the source and convert to Binary or Decimal with optional grouping and padding.
How do I convert ASCII text to hex or binary?
Set From to Text (ASCII) and To to Hex or Binary. Turn on padding and pick a delimiter for neat byte output.
How do I convert binary to decimal online for free?
Set From to Binary and To to Decimal. Paste your binary number (e.g., 1010) and the decimal result appears instantly. Use delimiters or grouping for longer binary strings.
How do I convert hexadecimal to decimal online?
Select Hex as the source and Decimal as the target. Enter your hex value (e.g., FF or 0xFF) and the converter shows the decimal equivalent in real time.
What is the easiest way to convert decimal to binary online?
Pick Decimal as the source and Binary as the target, enter your number, and optionally enable 8-bit padding for byte-aligned output. The binary result copies with one click.

You might also like