Decimal to ASCII Converter — Free, Browser-Only
Convert decimal codes (65, 97, 32) back to ASCII text. Useful for decoding char arrays. Browser-only.
About Convert Decimal to ASCII
Decimal to ASCII reverses the encoding: 65 → A, 97 → a, 32 → space. Useful for decoding character-code arrays, recovering text from C-style int arrays, and reading hex-dump-derived sequences. The ZTools Decimal to ASCII converter accepts any whitespace / comma-separated decimal list and outputs the resulting text, with warnings for out-of-range or non-printable codes.
Use cases
- Decode a char array. C array {72, 101, 108, 108, 111} → "Hello". Useful for reading firmware dumps.
- Read a manually-typed hex/decimal sequence. Forensics or CTF: hex/decimal numbers; convert to readable text.
- Inspect serialised data. Some binary formats use ASCII-decimal length prefixes — decode to verify.
How it works
- Paste decimal codes. Comma, space, or newline-separated. Tool parses each as integer.
- Validate. Codes 0-127 are pure ASCII. 128-255 extended. Above 255 (Unicode) toggles to UTF-8 mode.
- Convert. String.fromCharCode per code. Output assembled.
- Display. Resulting text. Non-printable codes shown as escape sequences (\n, \t) or control symbols.
Examples
Input: 72, 101, 108, 108, 111
Output: "Hello".
Input: 65, 66, 67, 32, 49, 50, 51
Output: "ABC 123".
Input: 9, 10
Output: \t\n (tab, newline).
Frequently asked questions
What if a code is out of range?
0-127 is pure ASCII. 128-255 is locale-dependent. Above 255 is Unicode (toggle UTF-16 / UTF-32 mode).
Non-printable codes?
Codes 0-31 are control characters. Tool shows them as \n, \t, etc., or special symbols (NUL, SOH).
Privacy?
All in browser.
Pro tips
- For pure ASCII text, codes stay 32-126 (printable). Anything else hints at non-ASCII or control characters.
- For roundtrip verification, convert text → decimal → text and confirm match.
Reviewed by Ahsan Mahmood · Last updated 2026-05-06 · Part of ZTools.
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