🛠 Salmon Tools — Free Online Developer Toolkit

A comprehensive collection of 17+ developer tools that run entirely in your browser. No signup, no installation, no data sent to servers — everything is processed client-side for maximum privacy and speed.

JSON Formatter & Validator SQL Formatter Timestamp Converter URL Encoder/Decoder Base64 Encoder/Decoder JWT Decoder Regex Tester Color Converter Hash Generator HTTP Client Redirect Tracer Escape/Unescape Percent Calculator UUID / GAID / IDFA Generator Text Diff Lorem Generator Memo Pad

Select a tool from the sidebar to get started. All tools support keyboard shortcuts and are optimized for both desktop and mobile.

0 chars / 0 lines

Beautify, minify, validate JSON and convert to TypeScript interfaces. Supports large JSON files with syntax error detection.

JSON Input

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, ISO 8601, and relative time display in KST/UTC.

Timestamp or Date Input

Encode and decode URLs, parse query parameters, and handle component-level encoding for safe URL construction.

Input

Encode and decode Base64 strings with full Unicode and multi-byte character support including Korean, Japanese, and Chinese.

Input

Decode JSON Web Tokens to inspect header, payload, and signature. Checks token expiry and displays claims in readable format.

JWT Token Input

Test regular expressions with real-time match highlighting, capture group display, and support for global/case-insensitive/multiline flags.

Regex Pattern

Test String

Color Input (HEX, RGB, HSL)

HEX

RGB

HSL

CSS Variable

Generate SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes using the Web Crypto API. All processing happens in your browser.

Input Text

Send HTTP requests (GET, POST, PUT, DELETE, PATCH) with custom headers and body. View response status, headers, and body with syntax highlighting.

Request Headers (JSON)

Request Body

Skip SSL

📜 History

Trace URL redirect chains and visualize each hop with status codes, response times, and headers. Detect infinite loops and final destinations.

URL Input

Skip SSL

Format and beautify SQL queries with proper indentation, or minify them for compact storage. Supports keyword case conversion.

SQL Input

Input

HTML

Unicode

Backslash (JSON String)

of % is?

e.g. 20% of 10000 = 2000

of is what %?

e.g. 500 of 10000 = 5%

to = what % change?

e.g. 10000 → 25000 = 150% increase

to % increase =?

e.g. 10000 + 25% = 12500

at % discount =?

e.g. 50000 - 30% = 35000 (saved: 15000)

Text A

Text B

Generate UUID v4, Google Advertising ID (GAID), and Apple IDFA identifiers. Supports bulk generation up to 100 at a time.

No hyphens UPPERCASE

📖 Reference
UUID v4 — Random 128-bit identifier. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
GAID — Google Advertising ID (Android). Same format as UUID v4, lowercase.
IDFA — Identifier for Advertisers (iOS/Apple). Same format as UUID v4, UPPERCASE.