Convert between Roman numerals and numbers both ways — chapters, clocks, movie credits. Decode MCMXCIV as 1994 instantly — local math, free, no signup.
Convert numbers between binary, octal, decimal, and hex with bitwise views. Read 0xFF as 255 instantly — local math, free, no signup.
Convert between plain text and binary in both directions — encode text into its base-2 representation or decode binary strings back to readable text, byte by byte. Files are converted locally in your browser — nothing is uploaded.
Translate text to Morse code and decode Morse back — with timing-accurate playback. Learn SOS (···---···) properly — local processing, free, no signup.
Convert IPv4 addresses between dotted-decimal, hex, integer, and binary forms. Decode 2130706433 to 127.0.0.1 instantly — local math, free, no signup.
Decode QR codes from uploaded images. Scan any QR code image and extract the embedded text or URL. Point it at screenshots, photos, or documents — decoded URLs and text copy out instantly. Runs locally, free, no signup.
1994 — M(1000) + CM(900) + XC(90) + IV(4). Subtractive pairs (IV, IX, XL, XC, CD, CM) trip up manual readers.
1–3999 standard (I to MMMCMXCIX); larger needs overline notation most tools skip. Clocks and chapters live comfortably inside. Type digits for number→numeral or letters for the reverse — detection is automatic, and validity is checked by round-trip (the numeral must re-encode exactly, so IIII and VV fail).
Yes — malformed numerals (IIII, VV) flag with the rule violated. Four repeats max, V/L/D never repeat.
No — conversion runs locally in your browser. Nothing leaves your device.
Last updated October 2026