Developer Tools
Format JSON, generate UUIDs and passwords, encode data and more.
JSON Formatter
Format, minify and validate JSON instantly. Clear syntax error messages with position, one-click copy and download in your browser.
Developer ToolsJSON Validator
Validate JSON online and get a precise error message with the position of the problem. Fast, local and free.
Developer ToolsUUID Generator
Generate cryptographically random UUID v4 identifiers in your browser. Bulk generation, copy and download - no server round-trips.
Developer ToolsBase64 Encoder / Decoder
Encode text to Base64 and decode Base64 back to text, with full Unicode support. Fast, local and free - no uploads.
Developer ToolsURL Encoder / Decoder
URL-encode text with percent-escapes and decode it back. Handles query strings, parameters and Unicode correctly in your browser.
Developer ToolsPassword Generator
Generate strong, random passwords with secure browser crypto. Choose length and character types, exclude ambiguous characters, and copy instantly.
Developer ToolsInternet Speed Test
Measure your connection's download speed and latency against this site's own server. Honest about what it does and does not measure.
Developer Tools