Free browser utilities
Free Online Developer Tools
Format, validate, encode, decode and generate common development data without sending pasted input to a backend.
JSON Formatter and ValidatorBeautify, minify and validate JSON safely.JavaScript BeautifierFormat or safely minify JavaScript without executing it.CSS BeautifierBeautify or minify CSS with indentation controls.HTML BeautifierFormat HTML as inert text without injecting it into the page.SQL FormatterFormat SQL with dialect and keyword-case options.Base64 Encoder and DecoderEncode and decode UTF-8 text or local files.URL Encoder and DecoderEncode URL components or decode encoded text.JWT DecoderInspect JWT headers, payloads and timestamps locally.Unix Timestamp ConverterConvert Unix timestamps and dates in UTC and local time.UUID GeneratorGenerate cryptographically secure UUID v4 values.
About these developer tools
These utilities treat pasted content as data. Formatters do not execute code, the JWT tool does not verify signatures, and decoded text should always be reviewed before use.
Developer Tools FAQ
Does the JSON formatter validate syntax?
Yes. It reports parsing errors and only formats valid JSON.
Is pasted code executed?
No. Beautifiers and formatters process it as inert text.
Does JWT decoding prove a token is valid?
No. Decoding only displays header and payload data; it does not verify the signature or trustworthiness.