Free Online Developer Tools
These developer tools handle small, frequent tasks: formatting and validating JSON, converting CSV to JSON, encoding and decoding Base64, URLs and HTML entities, testing regular expressions, generating UUIDs, converting timestamps and working with binary numbers.
Everything runs in your browser, so API responses and config snippets you paste are not sent to a server by Best Web Tools. Always avoid pasting secrets into any online tool you do not control.
JSON FormatterFormat, indent or minify JSON and see a clear error message when the input is not valid.JSON ValidatorCheck whether text is valid JSON and see the parser error if it is not.Base64 Encoder and DecoderEncode text to Base64 or decode Base64 back to readable text, with full UTF-8 support.URL Encoder and DecoderPercent-encode or decode text for use in URLs, as a component or a full URL.UUID GeneratorGenerate random version 4 UUIDs in bulk.Regex TesterTest a JavaScript regular expression against text and list every match with its position.HTML Entity Encoder and DecoderConvert special characters to HTML entities or decode entities back to text.CSV to JSON ConverterConvert CSV text into a JSON array of objects or arrays.Unix Timestamp ConverterConvert Unix timestamps to readable dates and dates back to timestamps.Binary ConverterConvert text to binary and back, or switch numbers between decimal, binary and hexadecimal.