Intl Playground

Test DateTimeFormat · NumberFormat · RelativeTimeFormat across locales

Preview locale-specific output of the browser-built-in Intl API. See how dates, numbers, relative time, lists, and plurals are formatted in each language — useful for checking results before building a multilingual UI.

Locale

Custom BCP 47

Overrides preset

Formatted output

Date & Time

Date style (dateStyle)

Time style (timeStyle)

June 25, 2026 at 4:37 AM

Number

Style (style)

1,234,567.89

Value (value · negative = past)

Unit (unit)

Notation (numeric)

3 days ago

Items (items · one per line)

Style (style)

Type (type)

apples, bananas, and oranges

Number

Type (type)

Category (category): one

n	Category (category)
1	one
2	other
3	other
4	other
5	other
6	other
7	other
8	other
9	other
10	other
11	other
12	other
13	other
14	other
15	other
16	other
17	other
18	other
19	other
20	other

How to use

Select a locale from the dropdown or type a custom BCP 47 tag such as fr-CA.
Switch between the DateTimeFormat, NumberFormat, RelativeTimeFormat, ListFormat, and PluralRules tabs.
Adjust the options within each tab and see the formatted output update in real time.
Copy the share link to save a specific locale and tab configuration.

Examples

Setting locale to ar-EG on the NumberFormat tab shows Arabic-Indic digits and right-to-left grouping for the number 1234567.89.
Switching to ko-KR on the DateTimeFormat tab with style "full" outputs the date in Korean with year, month, day, and weekday spelled out.

Verify outputs before using in production. No warranty — see Terms.