Why this tool is useful
Use this inspector when a system documents the conventional Snowflake bit layout and you need to audit the embedded time, worker number and per-millisecond sequence without rounding a 64-bit value.
Developer & Data · runs locally
Snowflake ID Timestamp Inspector
Decode non-negative decimal Snowflake IDs into timestamp, worker and sequence fields using a configurable millisecond epoch and the conventional 63-bit 41/10/12 layout.
Ready. Your working data stays in this browser.
How it works
The decimal input is parsed with BigInt, split into 41 timestamp, 10 worker and 12 sequence bits, then added to the selected epoch; values outside the unsigned 63-bit layout are rejected.
Practical example
With the default Twitter epoch, each pasted decimal ID is reported with an exact UTC millisecond timestamp, worker value from 0 to 1023 and sequence value from 0 to 4095.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.