Developer Tools (11)
The everyday utilities developers reach for, all in one place and all client-side. Format and validate JSON, encode and decode Base64 and URLs, generate UUIDs, hash text, decode JWTs, convert number bases, parse query strings, and more. Because everything runs in your browser, you can safely work with tokens, payloads, and private data.
JSON FormatterFormat, beautify and validate JSON with clear error messages.Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text (UTF-8 safe).URL Encoder / DecoderPercent-encode text for URLs, or decode an encoded URL back.UUID GeneratorGenerate random version-4 UUIDs in bulk.Hash GeneratorCompute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text.Unix Timestamp ConverterConvert between Unix timestamps and human dates, both ways.Color ConverterConvert colours between HEX, RGB and HSL with a live swatch.JWT DecoderDecode a JWT's header and payload, with expiry check.HTML Entity Encoder / DecoderEncode text to HTML entities or decode entities back to text.Number Base ConverterConvert numbers between binary, octal, decimal and hex.Query String ParserParse a URL or query string into decoded key/value pairs.
Frequently asked questions
Is it safe to paste sensitive data like tokens?
Yes — every developer tool runs locally in your browser, so nothing you paste is uploaded. Still, avoid sharing production secrets unnecessarily.
Do these tools require an account or API key?
No. All tools are free, require no sign-up, and have no usage limits.
Which hashing algorithms are supported?
The hash generator supports SHA-1, SHA-256, SHA-384 and SHA-512 via the Web Crypto API. MD5 isn't available because browsers don't expose it.