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Developer utilities that just work. No sign-up, 100% client-side.

← Magic Box
Base Converter

Binary, hex, octal, dec

encode
Base64

Encode & decode

encode
Binary Decoder

Encode & decode

encode
Case Converter

camelCase, snake_case, etc.

text
Certificate / TLS chain viewer

Parse PEM chains: SAN, validity, fingerprint

security
Code Editor

40+ languages

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Color Picker

Hex, RGB, HSL, eyedropper

encode
Cron Parser

Parse & explain cron

text
CSV / Excel → JSON

Table view & export

data
CSV / Excel Ops

Query, filter & dedupe

data
curl → Code

fetch / axios

web
curl Compare

Diff two curl commands

web
curl Online / HTTP Request

Paste curl, breakdown, send & view response

web
curl Viewer

Inspect & send curl in browser

web
Docker Compose

View services, ports & issues

web
Encoder/Decoder

Unified encode/decode

encode
Flow Canvas

Visual flow diagrams

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GraphQL Formatter

Format & validate GraphQL

data
GraphQL Validator

Validate queries & schema

data
Gzip Decompress Online

Gunzip Base64 & hex

encode
Hash Generator

MD5, SHA-256, HMAC, Bcrypt

security
Hex / Base64 to PDF Viewer

Hex to PDF & base64 to PDF

encode
Hex Decoder

Encode & decode

encode
HTML Entities

Encode & decode

web
HTML Renderer Online

Live HTML preview

web
HTTP Status Codes

1xx–5xx reference

web
Image to Base64

Image → data URL / base64

encode
Image token calculator

Image tokens for OpenAI, Claude, Gemini

llm
JSON ↔ TOML

Convert both ways

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JSON ↔ YAML

Convert both ways

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JSON Diff Online

Compare two JSONs

data
JSON Escape

Escape & unescape

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JSON Formatter

Pretty-print & validate

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JSON Operations

Query, filter & compare fields

data
JSON Schema Validator

Validate JSON against schema

data
JWT Decoder

Decode tokens

security
JWT Sign

Create & sign JWT tokens

security
KSUID generator

K-sortable base62 IDs

encode
LLM RAM / VRAM

Weights + KV cache memory estimate

llm
LLM stream log viewer

Pretty-print SSE / NDJSON LLM streams

llm
Lorem Ipsum

Placeholder paragraphs

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Markdown

Preview with TOC

web
Mermaid

Diagrams & charts

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Minify

JS, CSS, HTML, XML, JSON, GraphQL, SQL, YAML

text
OpenAPI viewer & curl

Browse OpenAPI / Swagger ops, copy curl

web
Password Generator

Random, passphrase, PIN

security
QR Code

Generate & scan

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QR Code to Link

Scan QR and reveal URL

text
Regex Generator

Create regex from examples

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Regex Tester

Test patterns

text
S3/R2 CORS

Fix bucket CORS errors

web
Safe Links Decoder

Unwrap protected URLs

security
Slug Generator

URL-friendly slugs

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SQL Formatter

Format & beautify SQL

data
Text Diff

Compare two texts side-by-side or unified

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Text Editor

Plain text editor

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Timestamp Converter

Unix epoch ↔ date & UTC

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Token & context budget

Count prompt tokens vs context window

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Token Calculator Online

Tiktoken counter & tokens→words

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Token speed simulator

Prefill vs decode latency

llm
TOML Formatter Online

Format toml & TOML linter

data
ULID generator

Lexicographic sortable IDs

encode
Unicode Decoder

Encode & decode

encode
Unit Converter

Duration, length, mass, data

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URL Parser

Parse & encode

web
URL Shortener

Short links, custom alias

web
UUID Generator

Generate & format UUIDs in bulk

encode
UUID Validator

Validate & reformat UUID / GUID

encode
XML Formatter

Format, validate, minify XML

data
YAML Diff Online

Compare two YAML files online

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YAML Formatter

Pretty-print, validate, minify

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YAML Validator

Parse check with line hints

data

More tools coming soon • Use Magic Box to auto-detect your input