Format and convert UUIDs online with our free UUID Formatter. Convert UUIDs to standard, uppercase, lowercase, compact, braces, URN, JSON, CSV and SQL formats. Detect invalid and duplicate UUIDs instantly.
UUID Formatter is a developer utility for converting existing UUID values into different textual representations. Unlike a UUID generator, this tool does not create new identifiers. Instead, it takes UUIDs that you already have and converts them into the format required by your application, API, database or development workflow.
You can process one UUID or paste a large list of UUIDs. The formatter recognizes common UUID representations, identifies invalid values and can detect duplicate identifiers before producing the final output.
urn:uuid:prefix.Developers often receive UUID values from database exports, logs, APIs or CSV files in inconsistent formats. Instead of formatting each value manually, you can paste multiple identifiers into the formatter and process them together.
UUIDs can be supplied on separate lines. The tool also handles common separators so that multiple values can be cleaned and formatted together.
Before formatting the values, the tool checks whether each entry contains the expected 32 hexadecimal characters. Invalid entries are separated from valid UUIDs so they can be reviewed before being used in another system.
Duplicate identifiers can cause problems when importing data into a database or preparing test datasets. UUID Formatter counts duplicate values and provides an option to remove duplicates from the formatted output.
Different development tasks may require different representations. You can convert your formatted UUID list into a JSON array, CSV, JavaScript array or SQL VALUES statement.
No. Formatting only changes how the UUID is displayed. For example, uppercase letters, hyphens and braces are presentation differences. They do not change the underlying 128-bit UUID value.
A UUID Formatter converts existing UUID values into different representations such as standard, uppercase, lowercase, compact, braces and URN formats without generating a new UUID.
Yes. You can paste multiple UUIDs separated by new lines, commas or semicolons and format them in one operation.
Yes. Each input value is checked for the expected hexadecimal UUID structure and invalid entries are reported separately from valid UUIDs.
Yes. The formatter can identify duplicate UUID values and lets you create a unique output without repeated identifiers.
The formatter supports standard 8-4-4-4-12 UUIDs, uppercase, lowercase, compact UUIDs without hyphens, braces and URN format.
Yes. Formatted UUIDs can be copied or exported as JSON arrays, CSV data and other developer-friendly formats.
No. Formatting changes only the textual representation of the UUID. The underlying 128-bit identifier remains the same.
No. This tool is designed to format existing UUIDs. Use the UUID Generator or Random UUID Generator when you need new identifiers.
Yes. UUID formatting is performed locally in your browser, so the UUID values do not need to be uploaded to a server.