$ ./megatools --list

Developer Tools, Zero Servers.

53 free tools running entirely in your browser. No uploads. No tracking.

~/qrcode

$ qr-code-generator

Generate QR codes from text, URLs, or any data. Download as PNG instantly.

Canvas API

~/json-formatter

$ json-formatter

Format, validate, and beautify JSON data with syntax highlighting.

Native JSON API

~/password-generator

$ password-generator

Create strong, random passwords with custom length and character sets.

Crypto API

~/uuid-generator

$ uuid-generator

Generate UUID v4 identifiers instantly. One click to copy.

Crypto API

~/base64

$ base64-encode/decode

Encode text to Base64 or decode Base64 back to readable text.

Native Text API

~/markdown-preview

$ markdown-preview

Write Markdown and see the rendered HTML preview side by side. Supports both .md and .mdx formats.

MDX + Native Parser

~/image-compressor

$ image-compressor

Compress images right in your browser. No uploads, no servers.

Canvas API

~/text-diff

$ text-diff-checker

Compare two texts and see the differences highlighted line by line.

LCS Algorithm

~/hash-generator

$ hash-generator

Compute SHA-1, SHA-256, SHA-384, SHA-512 hashes from text instantly.

Web Crypto API

~/jwt-decoder

$ jwt-decoder

Decode JWT header and payload, inspect claims, and check expiry — locally.

Native Text API

~/regex-tester

$ regex-tester

Test regular expressions live with match highlighting and capture groups.

Native RegExp API

~/aes-crypto

$ aes-encrypt/decrypt

Encrypt or decrypt text with a passphrase using AES-GCM. Keys never leave your device.

Web Crypto API

~/timestamp-converter

$ timestamp-converter

Convert Unix timestamps to dates and back, with relative time and live epoch.

Date / Intl API

~/url-encoder

$ url-encoder/decoder

Encode or decode URLs and query parameters safely. Component or full URI mode.

Native Text API

~/chmod-calculator

$ chmod-calculator

Compute file permissions from checkboxes or octal. Symbolic and numeric output.

Bitwise Logic

~/cidr-calculator

$ cidr-calculator

IPv4 subnet calculator: network, broadcast, netmask, host range from CIDR notation.

Pure Math

~/text-transformer

$ text-transformer

Convert text case (camel, snake, kebab...) and encode/decode HTML entities.

String Ops

~/qr-scanner

$ qr-scanner

Decode QR codes from image files right in your browser. No uploads.

BarcodeDetector API

~/pdf-merge

$ merge-pdf

Combine multiple PDF documents into a single file in your browser.

pdf-lib

~/pdf-split

$ split-pdf

Extract specific pages or page ranges from a PDF document.

pdf-lib

~/image-to-pdf

$ image-to-pdf

Convert photos and images (PNG, JPG, WebP) into a multi-page PDF document.

pdf-lib

~/image-converter

$ image-converter

Convert image files between PNG, JPG, and WebP formats with quality control.

Canvas API

~/exif-stripper

$ exif-&-metadata-stripper

Remove GPS coordinates, camera models, and private metadata from photos.

Canvas API

~/steganography

$ image-steganography

Hide secret encrypted text inside image pixels using LSB encoding, or extract it.

Canvas LSB

~/csv-json

$ csv-↔-json-converter

Bidirectional converter between CSV tables and JSON arrays with auto-delimiter detection.

Native Parser

~/yaml-json

$ yaml-↔-json-converter

Convert between YAML and JSON formats with live validation and line-number error reporting.

js-yaml

~/favicon-generator

$ favicon-&-icon-generator

Generate standard web and app icon sizes (16, 32, 48, 180, 192, 512px) with HTML snippet.

Canvas API

~/file-checksum

$ large-file-hasher

Calculate SHA-256, SHA-512, SHA-384, and SHA-1 checksums for large files with chunking.

Web Crypto

~/security-headers

$ security-headers-generator

Generate hardened HTTP security headers (CSP, HSTS, CORS, X-Frame-Options) for Nginx, Vercel, Apache.

Config Generator

~/port-lookup

$ common-ports-reference

Database of standard & security-sensitive TCP/UDP ports with service info and vulnerability risk notes.

Port Database

~/binary-converter

$ binary-&-base-converter

Convert text and numbers between Binary, Hex, Base32, Base58 (Bitcoin/Solana), and Decimal.

Bitwise Math

~/cert-inspector

$ ssl-/-x.509-certificate-inspector

Parse and inspect X.509 certificates and CSRs (PEM format) locally without sending keys anywhere.

ASN.1 Parser

~/sql-formatter

$ sql-formatter-&-beautifier

Format, beautify, and indent complex SQL queries in your browser. Supports PostgreSQL, MySQL, SQLite.

sql-formatter

~/code-minifier

$ html-&-css-minifier

Minify or beautify HTML and CSS code to optimize website load speeds and strip unnecessary bytes.

Regex Parser

~/color-contrast

$ color-contrast-&-palette

WCAG 2.1 contrast ratio checker (AA/AAA compliance) with instant HEX, RGB, HSL, and OKLCH conversions.

Color Science

~/svg-optimizer

$ svg-optimizer-&-cleaner

Clean and minify SVG vector files by stripping editor metadata, comments, and unused attributes.

DOM Parser

~/screen-recorder

$ screen-&-audio-recorder

Record your screen, browser tab, or app window with microphone audio. 100% private, zero uploads.

MediaRecorder API

~/audio-trimmer

$ audio-trimmer-&-cutter

Visual waveform audio cutter for MP3, WAV, and OGG files. Trim audio clips client-side.

Web Audio API

~/curl-converter

$ curl-to-code-converter

Convert cURL commands into JavaScript fetch, Python requests, Axios, and Go code.

Shell AST Parser

~/cron-parser

$ cron-expression-generator-&-parser

Parse and explain crontab schedules in plain English and calculate upcoming execution dates.

Cron Engine

~/http-status

$ http-status-codes-&-headers-explorer

Instant searchable directory of HTTP status codes (1xx-5xx) and common request/response headers with RFC references.

RFC Directory

~/keycode-tester

$ keyboard-event-&-keycode-tester

Interactive keyboard event inspector. Inspect event.key, code, legacy keyCode, and modifiers live.

KeyboardEvent API

~/json-to-ts

$ json-to-typescript-&-zod-schema

Convert JSON objects into TypeScript interfaces, types, and Zod validation schemas instantly.

AST Generator

~/html-to-jsx

$ html-/-svg-to-jsx-converter

Convert raw HTML and SVG into React and Next.js compatible JSX with camelCase attributes and style objects.

Regex AST

~/string-escape

$ string-&-regex-escaper-/-unescaper

Escape and unescape strings for JSON, JavaScript, SQL, Regular Expressions, Shell, and HTML.

String Encoding

~/css-generator

$ css-glassmorphism-&-shadow-generator

Interactive visual generator for modern CSS Glassmorphism, Box Shadows / Glow, and Gradients.

CSS3 Engine

~/hmac-generator

$ hmac-hash-&-signature-generator

Compute keyed-hash message authentication codes (HMAC) client-side for API auth & webhook verification.

Web Crypto API

~/keypair-generator

$ rsa-&-ecdsa-key-pair-generator

Generate asymmetric encryption & signing key pairs in standard PEM format (PKCS#8 / SPKI).

Web Crypto API

~/password-analyzer

$ password-entropy-&-strength-analyzer

Evaluate password complexity, Shannon entropy bits, and brute-force cracking resistance.

Shannon Entropy

~/svg-converter

$ svg-to-png-/-jpg-/-webp-converter

Convert and upscale SVG vector files to PNG, JPG, and WebP at 1x, 2x, 4x resolutions.

Canvas Rasterizer

~/color-extractor

$ image-color-palette-extractor

Extract dominant color palettes, HEX/RGB/HSL values, and CSS theme variables from any image.

Color Quantization

~/og-previewer

$ opengraph-&-social-meta-tag-previewer

Preview social share cards for Google, Twitter/X, Discord, Facebook, and generate HTML & Next.js metadata tags.

OG Parser

~/ipv6-calculator

$ ipv6-&-subnet-calculator

Calculate IPv6 subnets, expand/compress addresses, compute reverse DNS ip6.arpa, and inspect address scopes.

Bitwise IPv6 Engine

[fast]

Blazing Fast

Client-side processing. No server round-trips.

[private]

100% Private

Your data never leaves your device.

[free]

Completely Free

No paywalls. No signups. Just tools that work.