Binary Decoder

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Decode binary code in multiple modes. Most commonly used to recover text from UTF-8 binary; can also decode binary to decimal numbers or hex for low-level inspection.

Binary Decoder

Mode:
Options:
0 / 100,000 chars

Three decoding modes

  • Binary → Text: Decodes UTF-8 text. Most common use.
  • Binary → Decimal: Treats the entire binary string as a single number (uses BigInt, handles arbitrary length).
  • Binary → Hex: Useful for inspecting raw byte values.

Troubleshooting

If you see "Decoded bytes are not valid UTF-8", your binary represents non-text data. Switch to Binary → Hex to see the raw values.

How to use

  1. Pick a decoding mode: Binary → Text (most common), Binary → Decimal (treat all binary as one big number), or Binary → Hex (inspect raw bytes).
  2. Paste your binary code, or use 📁 Open File / drag a .txt onto the input.
  3. Output appears in real-time. If the text mode fails (UTF-8 error), try Decimal or Hex instead to inspect the values.
  4. Click Copy to grab the result. Nothing is uploaded — everything happens in your browser.

Frequently Asked Questions

What does it mean to "decode" binary?

Decoding means converting binary 0s and 1s back into their original form — typically readable text via UTF-8, or numeric values via decimal/hex interpretation.

Why does decoded binary sometimes look like garbage?

Garbage output usually means the binary wasn't UTF-8 text in the first place. It could be raw machine instructions, encrypted data, or a different encoding (Latin-1, Shift-JIS, etc.). Use Binary → Hex to inspect the raw bytes.

Can I decode binary numbers like 1010 to decimal?

Yes — use the Decimal → Binary tool in the opposite direction, or use the Binary → Decimal mode here for numeric decoding (not text).