Batch Unix Timestamp Converter
Convert up to 1,000 Unix timestamps to ISO UTC dates. Explicitly choose seconds or milliseconds and retain each source value.
Start with your input
Edit the example or replace it with your own text.
Choose your options
These settings are optional. Keep the defaults to get started.
How to use Batch Unix Timestamp Converter
- Load the included example or provide your own input and settings.
- Choose the operation and review the supported format below.
- Run the tool, inspect the result, and copy or download it.
Convert a log column consistently
Paste one integer timestamp per line and explicitly select seconds or milliseconds. Every result retains its original text alongside an ISO-formatted UTC date, which makes it easier to compare a converted log column with the source. Negative timestamps represent times before the Unix epoch. The tool does not guess units based on digit count, because historical and future values make that shortcut unreliable.
Preserve exact input precision
Both the parsed integer and its millisecond representation must fit JavaScript safe-integer precision, and the resulting date must be inside the browser date range. A malformed line stops the conversion with its original line number instead of silently dropping a record. Fractional timestamps and locale-dependent date strings are not accepted. For display in a regional time zone, use the separate time-zone converter after obtaining the UTC instant.
Example input
0 1700000000 -1
Does Batch Unix Timestamp Converter upload my input?
No. This tool processes input locally in your browser without calling a conversion API.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.