Encode text or binary data to Base64 format

Decode Base64 strings back to plain text

Encode numbers to compact Base62 alphanumeric strings

Decode Base62 strings back to their numeric value

Bitcoin/IPFS standard Base58 encoding — no ambiguous chars

Decode Base58 encoded strings back to plain text

Percent-encode URLs and query parameters safely

Decode percent-encoded URLs back to readable form

Decode and inspect JWT tokens — header, payload, claims

Format and pretty-print JSON with syntax highlighting

Compress JSON by stripping all whitespace instantly

Convert CSV spreadsheet data to JSON instantly

Bidirectional conversion between YAML and JSON

Format and indent XML documents for readability

Convert between JSON data and PHP array syntax

camelCase, snake_case, UPPER, kebab-case and more

Test if a site is vulnerable to clickjacking attacks

Inspect HTTP response headers for security misconfigs

Interactive reference for OWASP Top 10 web vulnerabilities

Generate MD5, SHA-1, SHA-256, SHA-512 hashes instantly

Encrypt and decrypt with the classic Caesar shift cipher

Parse email headers for forensics and phishing detection

Generate strong random passwords with custom rules

Generate RFC 4122 v4 UUIDs and GUIDs in bulk

Generate QR codes from any URL, text or WiFi data

Generate 1D barcodes — Code128, EAN, ISBN and more

Generate dummy placeholder text for layouts and mockups

Search and copy any emoji — by name, category or keyword

Visualize contributors for any GitHub repository

Generate .env file templates for various project types

Paste a cURL command and get a plain-English explanation

Translate cron expressions into human-readable schedules

Test and debug regular expressions with live highlighting

Format and beautify SQL queries for readability

Write Markdown with live preview side by side

Compare two texts and highlight differences line by line

Render Mermaid diagrams — flowcharts, sequence, ERD

Comprehensive Docker commands reference and cheat sheet

Paste HTML and preview it rendered live in the browser

Test and inspect API responses and payment webhooks

Read NFC tags directly in the browser via Web NFC API

Share text snippets via a shareable link instantly

Build and test Elasticsearch DSL queries

Convert Unix timestamps to human-readable dates and back

Convert times between any world timezones instantly

Complete Bash scripting reference from beginner to pro

Overview of common network protocols and use cases

Complete HTTP reference — methods, status codes, headers

TCP internals — handshake, flow control, reliability

UDP — connectionless, fast, datagram-based communication

Interactive OSI 7-layer model reference with examples

Full visual flow: how echobash.com resolves from root → TLD → authoritative NS → IP

Live DNS lookups — query A, MX, NS, TXT and more via Cloudflare DoH

Classic DNS query tool available built-in on Windows, macOS and Linux

Map every network hop to a destination — debug routing and latency

DNS concepts explained in a comic-book interactive format

DNS → TCP → TLS → Load Balancer → App Server → DB → response — every hop visualized

Token bucket, leaky bucket, sliding window — all 4 algorithms with live interactive demos

Authorization Code flow, tokens, refresh — who talks to whom and exactly what they say

SQL parser → query planner → optimizer → index scan → buffer pool → disk I/O

Power button → firmware → bootloader → kernel → launchd — every millisecond explained

Images, layers, containers, builds — namespaces and cgroups without the hand-waving

Geohash, Redis GEORADIUS, H3 hexagonal grid — how Uber finds 8 drivers in 15ms

Road graphs, A* pathfinding, Contraction Hierarchies, real-time probe data and ML — the full ETA stack

Event-driven architecture, reverse proxy, load balancing, SSL termination — how Nginx handles millions of requests with 4 worker processes

Edge nodes, PoPs, anycast routing, cache-control headers — how a CDN turns a 150ms request into an 8ms one

Drag, zoom, and click through a playable 3D map of the internet — DNS, TCP, TLS, and HTTP packets flying in real time

Every hop from DNS root servers to Google's load balancer — packet inspector, resource waterfall, 16-step cheat sheet

Count words, characters, sentences and reading time

Encode/decode HTML special characters and entities

Convert between text, ASCII codes, binary and hex

Apply ROT13 substitution cipher to any text instantly

Complete PostgreSQL reference — queries, functions, admin

Interactive Redis command reference with syntax and examples

Build, test and explore Elasticsearch DSL queries

Python requests — HTTP GET, POST, headers, authentication

Flask web framework — routes, templates, API patterns

Pandas DataFrames — read, filter, group, transform data

Python OpenAI SDK — chat completions, prompts, API patterns

Python's built-in urllib for URL handling and HTTP requests