Auto tokens
Auto mode treats bare digits as decimal and recognizes 0x41, 0b01000001, 0o101, \x41, %41, A and A.
Code input
Verified text output
Codes0
Characters0
Controls0
Verification—
Processing0 ms
Decoder audit
Why this decoder is strict
True ASCII has only 128 values. OneFreePlace blocks values above 127 in ASCII mode instead of silently wrapping them. If your data really is an 8-bit legacy code page, select it explicitly.
Ready. Ctrl/Cmd + Enter decodes.
Decoded code stream
Inspect every parsed code, byte representation, Unicode mapping and control name before trusting ambiguous data.
| # | Code | Hex | Binary | Glyph | Unicode | Name / note |
|---|
Batch decode code files
Choose multiple plain-text files containing numeric code streams. Valid files are decoded locally and packaged into one ZIP; invalid files are reported and skipped.
No files selected.
7-bit vs 8-bit bitstreams
ASCII is 7-bit, so a packed stream can use seven bits per character. Many stored byte streams use eight bits. Select the intended width; the decoder rejects incomplete groups.
Control characters
Tabs, newlines, carriage returns and ESC may be invisible in normal output. Switch to control pictures, labels, caret notation or C-style escapes to audit them safely.
Legacy encodings are explicit
Windows-1252, ISO-8859-1 and CP437 assign different characters to bytes above 127. They are available for compatibility, but they are not standard ASCII.
Fail-closed verification
The decoded raw text is encoded back through the same selected character set. Copy and Download are enabled only when the original code values are reconstructed exactly.
Use UTF-8 for modern interchange
ASCII remains useful for protocols, debugging and legacy data. For general modern text, UTF-8 is normally the appropriate encoding.