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BCP47 Language Tag Inspector

Process bcp47 language tag inspector locally with complete copy/download and explicit rules.

bcp47-language-tag-inspectorLOCAL WORKSPACE

Enabling local controls…

Inputs and settings

Processed in this tab without uploading or storing inputs. Each text field is limited to 32 KiB and complete output to 1 MiB; additional format and model limits apply.

Results

Review the settings and run. Editing inputs clears old results.

Processing model and limits

Use native Intl.Locale canonicalization, extensions, maximize/minimize. This accepts the Unicode locale-identifier subset of BCP47 supported by runtime, not all grandfathered/private-use-only tags or IANA registry validation. ≤128 ASCII tag characters. Likely-subtag and alias results depend on browser CLDR/ICU data; no locale data is fetched. Each text field is limited to 32 KiB; complete output to 1 MiB. Runs in a one-second local Worker, with no network requests.

Data and model checked: ToolHubEN source controls ↗ECMA402 Locale Objects ↗

How to use this tool

Load the example, confirm field units and processing rules, then run locally. Editing any input clears the old result. Copy or download the complete output explicitly.

When not to use it

Use native Intl.Locale canonicalization, extensions, maximize/minimize. This accepts the Unicode locale-identifier subset of BCP47 supported by runtime, not all grandfathered/private-use-only tags or IANA registry validation. ≤128 ASCII tag characters. Likely-subtag and alias results depend on browser CLDR/ICU data; no locale data is fetched. Each text field is limited to 32 KiB; complete output to 1 MiB. Runs in a one-second local Worker, with no network requests.