Free Online Developer Tools (Fast & Private)
All tools run in your browser—no sign-up, no tracking. Pick a tool below or search.
JSON Formatter
Format, validate, minify, and sort JSON keys.
Base64 Encoder
Encode UTF-8 text to Base64 (standard or URL-safe).
Base64 Decoder
Decode Base64 to UTF-8; auto-padding and URL-safe.
URL Encoder/Decoder
Encode or decode URI/URL components.
Whitespace Remover
Remove spaces, line breaks, and trim.
Case Converter
lowercase, UPPERCASE, Title Case, camelCase…
Word & Character Counter
Words, characters, bytes (UTF-8).
CSV ↔ JSON Converter
Lightweight CSV/JSON conversion.
XML Formatter
Pretty-print or minify XML.
Hash Generator (SHA-1 / SHA-256)
Compute hashes with Web Crypto.
UUID Generator
Generate all UUID types (v1, v2, v3, v4, v5) and Snowflake IDs. Supports time-based, random, name-based, and timestamp-based UUIDs.
JWT Decoder
Decode JWT header & payload (no signing key).
Unix Timestamp Converter
Epoch seconds ↔ human date/time.
Regex Tester
Match lists + highlighted output.
Diff Checker
Compare two texts line-by-line.
Color Converter
HEX ↔ RGB ↔ HSL with swatch.
SQL Formatter
Format SQL queries.
Calculator
Basic & scientific calculator. Fast, privacy-friendly, works offline.
Epoch to Timezone
Convert Unix epoch to your local or any selected timezone.
YAML ⇄ JSON Converter
Convert YAML to JSON and JSON to YAML instantly, online and free.
Photo Resizer
Resize and compress photos for passport, visa, ID, Aadhaar, PAN, government exams, and digital formats. Includes ready-made presets for India, China, U.S., EU, and more.
System Info
View detailed information about your computer, browser, device, network, and environment in a professional format.