What format should the binary be in?

Groups of 8 binary digits separated by spaces (e.g. 01001000 01101001). Groups of 7 digits are also accepted for legacy 7-bit ASCII input.

Can it decode Unicode?

Yes. Consecutive bytes are interpreted as UTF-8, so multi-byte sequences for emoji or accented letters are decoded back to their original characters.

What happens with invalid input?

Groups that aren't exactly 7 or 8 bits, or contain characters other than 0 and 1, are reported as errors rather than silently skipped.

Where is decoding performed?

Entirely in your browser. No upload, no logging.

8-bit aligned · UTF-8 decode

Decode binary back to text

Convert 0s and 1s back to UTF-8 text. Strips whitespace automatically — input must be a multiple of 8 bits.

Binary → Text Workspace

Input size

98 B

88 bits

Decoded chars

UTF-8

Bytes

/ 8

Status

8-bit aligned

input · binary

output · text

Hello world

Quick Start

How to decode binary

Strips whitespace, splits into 8-bit groups, decodes as UTF-8.

01
Paste binary
Any whitespace separator works.
Tokenisation is Unicode-aware via \p{L}\p{N} property classes — so accented letters, ideographs, and emoji code points all count correctly.
bitsUTF-8Unicodecode pointslive
input · textraw · UTF-8
```
01001000
```
loaded · UTF-8UTF-8 · ready
02
Auto-grouped
Whitespace stripped, then chunked 8 bits at a time.
Live re-counts run on every keystroke through a memoised reducer, so even multi-megabyte inputs stay smooth in the editor.
8-bitlivememoisedoptionssnappy
groups · optionsbytes · live
```
01001000 → H
```
options applied · livelive
03
UTF-8 decoded
Bytes are decoded as UTF-8 — multi-byte characters work.
Output preserves the original line endings (\n vs \r\n) and trailing whitespace is reported separately so you can spot diff-only changes.
UTF-8line endingswhitespacediff-cleanreproducible
decode · countedtext · ready
```
Hello world
```
counted · livecounted
04
Copy or download
One click.
Copy writes via the Async Clipboard API; downloads ship as text/plain; charset=utf-8 — nothing leaves your tab.
copyclipboardtext/plainblobclient-side
export · copiedready · done
```
✓ Copied
```
shipped · ready to shipsuccess

Pro tips

Text-processing fundamentals worth knowing

Tokenise with Unicode classes

Use \p{L}\p{N} with the u flag so accents, ideographs, and emoji count properly.

Normalise line endings

Convert \r\n to \n before diffing or hashing — Windows-vs-Unix endings produce phantom changes.

Mind invisible characters

Zero-width joiners, BOMs, and non-breaking spaces look identical to ASCII space. Strip them before comparison or storage.

Stream don’t slurp

For multi-megabyte text, iterate line-by-line rather than loading everything to memory — keeps the tab responsive.

Choose collation deliberately

Default JS sort is code-point order, not human alphabetical. Use Intl.Collator for locale-aware sorting.

Re-run after normalisation

NFC vs NFD changes byte length but not visible glyphs. String.prototype.normalize() before counts and comparisons.

Use Cases

When to decode binary

Educational, debugging, or just for fun.

CTF challenges

Decode binary clues in capture-the-flag. Tokenisation uses Unicode property classes (\p{L}, \p{N}) with the u flag so accents, ideographs, and emoji code points all count correctly. Surrogate-pair-aware counts mean 🚀 weighs 1, not 2.

Unicode-correct

Teaching

Demonstrate how text becomes bytes in CS classes. Result updates as you type — paste and watch totals settle in milliseconds even on multi-megabyte inputs. Heavy work runs through a memoised reducer so the editor never janks.

diff-clean

Byte-level debugging

Confirm encoding correctness when inspecting buffers. Output normalises line endings to LF for clean diffs across platforms. Windows-vs-Unix CRLF mismatches disappear, which keeps git blame honest and review comments focused on real changes.

instant counts

ASCII art reversal

Decode binary ASCII art puzzles. Code-point counts are stable across NFC/NFD normalisation. Pair with the Reading Time Calculator to layer scan-time on top of raw counts, useful for editorial budgets and SEO meta-description limits.

platform-aware

Curiosity

See what a phrase looks like in binary. All processing runs client-side — paste sensitive or pre-publish copy without it leaving the tab. The clipboard API writes UTF-8 text/plain so it survives transit to any editor or CMS.

code-point-accurate

Round-trip test

Verify Text → Binary → Text returns identical input. Same input plus same options always produces identical output, so the tool is safe to embed in CI scripts or doc-generation pipelines without race conditions.

lossless

FAQ

Frequently asked questions

What separators work?

Any whitespace — single space, multiple spaces, tabs, newlines. All non-0/1 characters are ignored.

What if my input isn't a multiple of 8?

Returns an error. Make sure each byte is 8 bits long.

Multi-byte UTF-8?

Yes — runs through TextDecoder('utf-8') which handles continuation bytes correctly.

Is anything sent to a server?

No. All decoding runs locally.

Other formats?

For Base64 / Hex / URL encoding, see the Encoding category.

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