Free online developer tools

Pretty print, minify, validate, and sort JSON online.

Validate JSON syntax instantly in your browser.

Decode JWT header and payload segments without verification.

Generate UUID v4 values in bulk.

Encode text to Base64 online.

Decode Base64 text online.

Convert Unix timestamps and ISO 8601 dates.

Test JavaScript regular expressions against sample text.

Beautify SQL for MySQL, PostgreSQL, and generic SQL.

Convert colors between HEX, RGB, and HSL.

Generate placeholder words, sentences, and paragraphs.

URL-encode text for query strings and paths.

Decode URL-encoded text online.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Convert JSON arrays to CSV with flattened nested objects.

Convert JSON to YAML with nested object support.

Compare two JSON documents side by side.

Count words, characters, sentences, and paragraphs.

Count characters with and without spaces.

Calculate days, weeks, months, and years between dates.

Convert common length, weight, and temperature units.

Convert text to uppercase, lowercase, title case, slug case, and camelCase.

Convert a time between common global time zones.

Count days until the next birthday.

Count weekdays between two dates.

Resize width or height while preserving aspect ratio.

Convert image dimensions to megapixels and estimated raw size.