Harold
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Tech
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Free tools
Small tools that run in your browser. No sign up, and nothing you type is sent to a server.
Network
IPv4 subnet calculator
Network, broadcast, host range and mask for any IP and prefix, plus subnet splitting.
Generate
QR code generator
A QR code for a link, text or Wi-Fi network, as PNG or SVG.
Developer
JSON formatter
Format, minify, sort and validate JSON, with the line and column of any error.
Base64 and URL encoder
Encode and decode Base64 (also URL safe) and percent-encoded URLs, UTF-8 aware.
JWT decoder
Read the header and claims of a token and see when it expires.
