Phone number formatter
Phone number formatter with local processing and strict input validation.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Text
Result
The result was generated locally.
Enter text to process
What this tool does
- Transform text locally.
- Process copied text without uploading data.
- Standardize phone number display with a chosen separator.
Example
Input
13800138000
Output
138-0013-8000
All processing runs locally and invalid input is rejected explicitly.
Frequently asked questions
Is empty input supported?
Yes, it returns an empty result.
How is invalid input handled?
It returns an explicit invalid-input error.
Can I use a custom separator?
Yes. Enter the character you want to use in the separator field.
Keywords：手机号码格式化Phone number formatterphone-formattertext encodinglocal tool