# decode64.com

> Free online developer tools. Runs entirely in the browser — no data uploaded, no server processing, no logs.

## What this site does

- Decodes and encodes Base64 strings (text, files, UTF-8)
- Decodes JWT tokens — shows header, payload, claims, expiration time
- Converts images to Base64 data URIs and decodes Base64 back to images
- Formats, validates, and minifies JSON
- Encodes and decodes URL percent-encoding
- Encodes and decodes HTML entities (named + numeric)
- Formats HTML, YAML, SQL code
- Minifies CSS
- Generates QR codes (URL, WiFi, SMS, Email, Phone types)
- Generates UUID v4 in bulk
- Converts CSV to JSON and JSON to CSV (bidirectional)
- Converts Unix timestamps to human-readable dates
- Generates MD5, SHA-1, SHA-256, SHA-512, HMAC hashes
- Picks colors and converts HEX, RGB, HSL
- Generates color palettes (complementary, analogous, triadic)

## Who uses it

Developers, security researchers, DevOps engineers working with APIs, JWT tokens, Base64 data, JSON payloads, color codes, or binary data.

## Common use cases

- Inspecting JWT token claims and expiration
- Encoding images to data URIs for HTML/CSS embedding
- Formatting minified JSON for readability
- Generating UUIDs for database records or test fixtures
- Converting CSV exports to JSON
- Generating SHA-256 hashes for file integrity

## Technical details

- Pure JavaScript, no backend
- No cookies, no analytics, no tracking
- Works offline once loaded
- Hosted on Cloudflare Pages (global CDN)

## Pages

- / — Base64 Decoder & Encoder
- /jwt-decoder — JWT Token Decoder
- /base64-image — Base64 Image Converter (Image↔Base64)
- /json-formatter — JSON Formatter & Beautifier
- /json-minifier — JSON Minifier & Validator
- /url-encoder — URL Encoder & Decoder
- /html-formatter — HTML Formatter & Beautifier
- /html-entities — HTML Entity Encoder & Decoder
- /css-minifier — CSS Minifier & Formatter
- /yaml-formatter — YAML Formatter & Validator
- /sql-formatter — SQL Formatter
- /color-picker — Color Picker (HEX, RGB, HSL)
- /color-palette — Color Palette Generator
- /qr-code-generator — QR Code Generator
- /uuid-generator — UUID v4 Generator
- /csv-to-json — CSV to JSON Converter
- /epoch-converter — Unix Timestamp Converter
- /hash-generator — Hash Generator (MD5, SHA-256, SHA-512)
- /tools — All tools listing
- /about — About
- /privacy.html — Privacy Policy
- /terms.html — Terms of Use
- /sitemap.xml — Sitemap