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

Date & Time

dateStyle

timeStyle

May 11, 2026 at 3:45 PM

Number

style

1,234,567.89

Value (negative = past)

unit

numeric

3 days ago

Items (one per line)

style

type

apples, bananas, and oranges

Number

type

Category: one

n	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

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