SHA-256 Hash Generator

Decode a JWT

The signature is not verified — that needs the key, and pretending otherwise is worse than not doing it. This only decodes the contents.

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Pyeong ↔ square meters

1 pyeong is 400/121 m² (about 3.3058 m²). Type in either box and the other updates.

Apartment exclusive area

Apartment sizes quoted in pyeong in Korea usually mean supply area (exclusive area plus stairs and hallways), so they're larger than the exclusive area converted.

Japanese era (wareki) ↔ Gregorian

Short forms like R1.5.1 or H31 work. In a year when the era changed, enter the full date to get a single answer.

Number to Korean words

Used when writing amounts on contracts and quotes — the number and the words together make tampering harder.

Korean name romanization

Follows the Revised Romanization of Korean. Sound changes inside a given name aren't reflected, as the standard requires. A passport's English name is hard to change, so if you already use a spelling, keep it.

After replacement

Next runs

Computed in this browser's time zone. Server cron usually runs in UTC, so these times can differ from what your server will do.