The glass reads through whatever sits behind it. Start with Horizon, or pick your own.
Suggested
JSON Formatter
Format & Validate
Base64 Encode/Decode
Encode & Decode
URL Encode/Decode
Hash Generator
Generators
UUID Generator
Unix Time Converter
Inspect & Debug
JWT Debugger
RegExp Tester
Inspect font file metadata, glyphs and OpenType features
Drop a font file
TTF, OTF and WOFF — WOFF2 is not supported in the browser