Catalogue
Tools
Every utility solves one clear task, processes data locally whenever possible and includes reviewed examples.
- Online JSON formatterFormat or minify JSON without sending your data to a server.
- Online JSON validator with line and column detailsCheck syntax and locate the first error without changing or sending your JSON.
- Online JSON to YAML converterConvert valid JSON to readable YAML while preserving types and large numbers.
- Online YAML to JSON converterConvert a YAML 1.2 document to readable JSON without sending it.
- Online JSON to CSV converterConvert tabular JSON data to CSV or TSV without sending it.
- Online Base64 and Base64URL encoderEncode or decode UTF-8 text as Base64 or Base64URL with explicit padding and strict validation.
- Online URL, component and query encoderEncode URL components, complete URLs or form values and detect possible double encoding.
- Online query string parser and builderSplit, edit and rebuild URL parameters without losing duplicate keys or sending the data.
- Online JWT decoderRead a JWT header and payload and convert exp, iat and nbf without verifying its signature or claims.
- Online UUID v4 generatorGenerate UUID v4 identifiers with secure local randomness.
- Unix timestamp converterConvert a date and time to Unix timestamp, or a timestamp to date, in seconds or milliseconds.
- Online SHA-256 hash generatorCalculate a SHA-256 digest for UTF-8 text locally.
- Online text comparatorCompare two texts line by line in your browser.
- IPv4 subnet, CIDR and mask calculatorConvert CIDR and masks or calculate the full range of an IPv4 subnet.
- Bandwidth and transfer time calculatorRelate data, speed and time with decimal and binary units without measuring traffic.
- IPv4 and number base converterConvert IPv4 addresses and integers between decimal, hexadecimal and binary exactly.
- Online CRC calculator for text and bytesCalculate known or custom CRC variants without sending the data.
- LED resistor calculatorCalculate a preferred resistor and power rating for series or parallel LED branches.
- Resistor color code calculatorRead resistor bands and calculate value, tolerance and range.
- Storage unit converterConvert decimal and binary storage units with exact precision.