Numeric input fails
use only the notation and separators documented for this tool. An out-of-range or incomplete byte is invalid.
Convert binary bytes to Base64
Encode binary bytes as standard or URL-safe Base64 while preserving the source representation. Review, copy or download the result.
Base64 utility · Fast, exact Base64 conversion
What this tool does
This page encodes binary bytes into Base64 without applying format-specific validation or transformation. Use Standard or URL-safe output according to the receiving protocol, then copy or download the value.
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Review output and byte details
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2. Action
3. Output
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4. Quick actions
5. Base64 information
DescriptionBase64 represents bytes as text; it is not encryption.
AlphabetA-Z, a-z, 0-9, +, /, =
Input size0 characters / 0 bytes
Output size0 characters / 0 bytes
PaddingUses = to complete a four-character group.
StatusReady
How it works
Input bytes
101010 111100 110101 ...
Split into 6-bit groups
101010 111100 110101 ...
Convert to indexes
42 60 53 ...
Base64 characters
q 8 1 ...
How to convert binary bytes to Base64
Paste the byte sequence using the notation described for this tool.
Keep Encode selected and choose the output option shown by the tool.
Review the output and byte information, then copy or download the result.
Output and format behavior
The parser reads 0 and 1 as byte-aligned 8-bit groups, strips allowed whitespace, and rejects a total bit count that is not a multiple of eight.
Use Standard Base64 for the normal RFC 4648 alphabet. Use URL-safe only when the receiving system expects Base64URL; padding rules can differ by protocol.
Expert tip
Record byte order separately. Base64 preserves sequence, but it does not explain whether a multi-byte number is big-endian or little-endian.
When this is useful
Typical workflows include:
- Translate byte examples from protocol documentation, packet captures or debugger output into Base64.
- Create a reproducible test fixture without manually rewriting the source bytes.
- Inspect or compare a small payload when the original representation is opaque or difficult to paste safely.
Limitations and safety
Important constraints:
- Base64 normally adds about one third to the byte payload, before any data-URL prefix or surrounding markup.
- Base64 is reversible encoding, not encryption. Anyone who receives the string can decode the original bytes.
- Use only the numeric notation documented for this tool. Out-of-range, incomplete or mixed-notation byte values are invalid.
Troubleshooting
The expected bytes do not match
verify byte sequence, endianness and field boundaries; Base64 does not store numeric meaning.
Frequently asked questions
What exactly is preserved?
The parser reads 0 and 1 as byte-aligned 8-bit groups, strips allowed whitespace, and rejects a total bit count that is not a multiple of eight.
What input notation does this page expect?
Use the exact byte notation described for this tool. Decimal, binary, hexadecimal and octal inputs are handled by separate converters, and the wrong notation is rejected.
What is the difference between standard Base64 and Base64URL?
Standard Base64 uses + and /. Base64URL uses - and _ and may omit padding; choose the form required by the receiving system.
Does Base64 record byte order or numeric meaning?
No. It preserves the byte sequence only. Record endianness, signedness and field boundaries separately when they matter.
Related Base64 tools
Continue with the localized page that matches the next operation:
Convert Base64 to binary bytesConvert hexadecimal bytes to Base64Convert octal bytes to Base64Convert decimal ASCII byte codes to Base64
Paste your input above, run the conversion, and copy or download the result.