Fast · Local-first · No sign-up

One bench.
Every tiny task.

Developer, DevOps, security, web, image and network utilities that work where you do. Most tools process data locally; live lookups connect only when you run them.

120+focused utilities
in one workspace

Code

JSON Formatter

Format and validate JSON instantly.

Code

JSON Minifier

Compress JSON without changing data.

Code

JSON Diff

Compare two JSON documents line by line.

Code

JSON to CSV

Convert an array of objects to CSV.

Code

CSV to JSON

Turn CSV rows into structured JSON.

Code

YAML to JSON

Convert simple YAML documents to JSON.

Code

XML Formatter

Indent compact XML for easier reading.

Code

SQL Formatter

Make SQL queries readable.

Code

SQL Minifier

Collapse SQL to a single compact line.

Code

RegEx Tester

Test JavaScript regular expressions with highlights.

Code

Base64 Encoder

Encode UTF-8 text as Base64.

Code

Base64 Decoder

Decode Base64 back to UTF-8.

Code

JWT Decoder

Inspect JWT content without verifying its signature.

Code

URL Encoder

Percent-encode text for URLs.

Code

URL Decoder

Decode percent-encoded URL text.

Code

HTML Entity Encoder

Escape HTML-sensitive characters.

Code

HTML Entity Decoder

Decode HTML entities back to text.

Code

SHA-256 Hash

Create a SHA-256 digest locally.

Code

HMAC-SHA256

Sign text with an HMAC-SHA256 key.

Code

UUID Generator

Generate random RFC 4122 UUIDs.

Code

Unix Timestamp Converter

Convert Unix time to ISO dates.

Network

Subnet / CIDR Calculator

Calculate network, broadcast and host ranges.

Network

IPv4 to Integer

Convert dotted IPv4 to a 32-bit integer.

Network

Integer to IPv4

Convert an integer to dotted IPv4.

Network

IPv6 Expander

Expand compressed IPv6 notation.

Remote

DNS Lookup

Query public DNS-over-HTTPS records.

Remote

IP Address Info

Look up public IP registration and location.

Network

Port Reference

Find common TCP and UDP service ports.

Network

HTTP Status Reference

Explain an HTTP status code.

Network

Password Generator

Generate strong cryptographic passwords.

Network

Password Strength

Estimate password entropy.

Network

Basic Auth Header

Create an HTTP Basic Authorization header.

Network

MAC Address Normalizer

Normalize a MAC address.

Network

WHOIS Shortcut

Build trusted WHOIS lookup links.

Network

CIDR Mask Reference

Get netmask, wildcard and host capacity.

Web

HTML Formatter

Indent HTML source for inspection.

Web

HTML Minifier

Remove comments and excess whitespace.

Web

CSS Formatter

Expand compact CSS into readable blocks.

Web

CSS Minifier

Compress CSS for production.

Web

JavaScript Minifier

Remove comments and redundant whitespace.

Web

Color Converter

Convert HEX colors to RGB and HSL.

Web

Contrast Checker

Check WCAG color contrast.

Web

Gradient Generator

Generate a CSS linear gradient.

Web

Box Shadow Generator

Build a CSS box shadow.

Web

Border Radius Generator

Create per-corner border radius.

Web

CSS Unit Converter

Convert pixels and rem.

Web

Aspect Ratio Calculator

Calculate dimensions from a ratio.

Web

CSS Clamp Generator

Create fluid responsive CSS values.

Web

Meta Tag Builder

Generate SEO and social meta tags.

Web

UTM Builder

Add campaign parameters to a URL.

Remote

QR Code Generator

Create a QR code for text or URLs.

Web

Image Extractor

Extract image sources from pasted HTML.

Web

Page Outliner

Extract headings from pasted HTML.

Web

SEO Meta Inspector

Inspect metadata in pasted HTML.

Web

Site Stack Detector

Detect common framework signatures.

Web

HTML Selector Extractor

Extract text using a CSS selector.

Text

Word & Character Count

Count words, characters, lines and reading time.

Text

Case Converter

Convert text into common naming cases.

Text

Slug Generator

Turn a title into a URL slug.

Text

Sort Lines

Sort lines alphabetically.

Text

Remove Duplicate Lines

Keep the first occurrence of each line.

Text

Text Diff

Compare two text blocks line by line.

Text

Markdown Preview

Preview lightweight Markdown safely.

Text

Text to Binary

Encode UTF-8 text as binary bytes.

Text

Binary to Text

Decode space-separated binary bytes.

Text

ROT13 Encoder

Apply the reversible ROT13 substitution.

Text

Morse Code Encoder

Encode letters and digits as Morse code.

Text

Lorem Ipsum Generator

Generate placeholder paragraphs.

Text

Reverse Text

Reverse Unicode-aware text.

Text

Unicode Inspector

Inspect Unicode code points.

Text

Normalize Line Endings

Normalize text to Unix LF line endings.

Code

Smart Input Detection

Paste unknown data and get likely formats plus the best matching tools.

Code

JSON Schema Validator

Validate JSON against a practical JSON Schema subset.

Code

JSONPath Tester

Query JSON with common JSONPath expressions.

Code

XPath Tester

Evaluate XPath expressions against XML or HTML.

Code

cURL ↔ Fetch / Axios

Convert cURL commands to browser Fetch or Axios snippets.

Remote

API Request Tester

Send HTTP requests and inspect status, headers and response body.

Code

Cron Expression Parser

Explain a five-field cron expression and calculate upcoming runs.

Code

Semantic Version Calculator

Compare versions and test common semantic-version ranges.

Code

Number Base Converter

Convert integers between binary, octal, decimal and hexadecimal.

Code

chmod Calculator

Translate Unix permission modes between symbolic and octal forms.

Code

MIME Type Lookup

Look up common MIME types from an extension or filename.

Code

.env Parser / Validator / Diff

Parse, validate and optionally compare environment files.

Code

Mock Data Generator

Generate realistic local test records from a compact template.

Code

JSON → Typed Models

Generate TypeScript, Go, Java or C# models from JSON.

Code

TypeScript Interface → JSON

Create representative JSON from a TypeScript interface.

Code

SQL DDL → TypeScript

Turn CREATE TABLE columns into TypeScript interfaces.

Code

OpenAPI / Swagger Validator

Check the essential structure and references of an API document.

Code

GraphQL Formatter / Builder

Format GraphQL documents and build a query from field paths.

Code

Protocol Buffers Viewer

Inspect .proto messages, enums, services and fields.

Code

jq Playground

Run common jq-style selectors, projections and array iteration locally.

Code

TOML ↔ JSON

Convert common TOML documents to JSON or JSON to TOML.

Code

INI ↔ JSON

Convert INI configuration files to JSON and back.

Code

Properties Converter

Convert Java .properties files to JSON and back.

Text

Date Duration Calculator

Measure exact elapsed time and calendar distance between timestamps.

Code

Floating Point Inspector

Inspect IEEE-754 binary64 sign, exponent and fraction bits.

Text

Batch Text Transformer

Apply trim, case, sort, unique, encode or decode to many lines.

Network

IPv6 Subnet Calculator

Expand, compress and inspect IPv6 prefixes and address ranges.

Network

CIDR Aggregator

Merge adjacent IPv4 networks and remove redundant routes.

Network

Route Summarizer

Find the smallest IPv4 supernet covering a list of addresses.

Network

DNS Zone File Parser

Parse common DNS zone records into structured JSON.

Network

Cisco ACL / Wildcard Calculator

Convert IPv4 CIDR prefixes to Cisco wildcard masks.

Network

HTTP Header Analyzer

Review HTTP headers for security, caching and delivery issues.

Network

CORS Header Tester

Evaluate response CORS headers against an origin and credential mode.

Network

HAR Viewer

Open a HAR file and summarize requests, timing, sizes and failures locally.

Network

Docker Run ↔ Compose

Convert common docker run commands to Compose YAML.

Network

Kubernetes YAML Validator

Check essential Kubernetes object fields and document structure.

Network

Nginx Config Formatter

Indent and normalize Nginx configuration blocks.

Network

Docker Compose Validator

Check Compose services, images, builds, ports and volumes.

Network

JWT Signer / Verifier

Create and verify HS256 JWTs entirely in your browser.

Network

X.509 Certificate Inspector

Inspect PEM certificate metadata, fingerprints and embedded names.

Network

PEM / RSA / EC / JWK Inspector

Identify key containers and inspect safe public metadata.

Network

Password KDF Studio

Derive and verify PBKDF2 hashes with configurable iterations and salt.

Network

BCrypt / Argon2 Command Builder

Generate safe, copy-ready commands for BCrypt and Argon2 workflows.

Network

TOTP / 2FA Generator

Generate RFC 6238 one-time codes from Base32 secrets.

Network

CSP Header Builder / Analyzer

Build or audit a Content-Security-Policy header.

Network

SRI Generator

Create SHA-256, SHA-384 or SHA-512 Subresource Integrity hashes.

Network

Punycode / IDN Converter

Convert internationalized domain names with browser-native URL handling.

Remote

Password Breach Check

Check HIBP via k-anonymity; only a five-character hash prefix is sent.

Network

File Checksum

Calculate SHA-256, SHA-384 and SHA-512 checksums locally.

Web

Image Compressor

Compress JPEG or WebP images locally with adjustable quality.

Web

Image Resizer / Cropper

Resize and center-crop images locally to exact dimensions.

Web

Image Format Converter

Convert images to PNG, JPEG or WebP entirely in the browser.

Web

SVG Optimizer / Preview

Remove common SVG noise and preview the optimized result.

Web

EXIF Viewer / Metadata Remover

Inspect JPEG EXIF presence and export a metadata-free copy.

Web

Favicon Generator

Create 16, 32, 48 and 180 pixel favicon assets from an image.

Web

Color Palette Extractor

Extract dominant colors from an image locally.

Web

CSS Animation Previewer

Preview HTML and CSS animations inside an isolated frame.

Web

CSS Grid Generator

Generate and preview responsive CSS Grid layouts.

Web

Flexbox Playground

Experiment with flex direction, alignment, gaps and wrapping.

Remote

Responsive Breakpoint Preview

Preview a URL at common phone, tablet and desktop widths.

Web

Accessibility / ARIA Inspector

Find common semantic, label, heading and image-alt issues in HTML.

Practical tools, organized by the work you do

DevNet Kit brings focused developer and network utilities into one searchable workspace. Each tool also has a permanent page with instructions, examples and related utilities.

Code & Data ToolsFormat, validate, convert and inspect JSON, SQL, XML, YAML, APIs and application data directly in your browser.Network & Security ToolsCalculate subnets, inspect headers and certificates, work with DNS, JWTs, hashes, passwords and infrastructure configuration.Web & Design ToolsBuild, inspect and optimize HTML, CSS, images, metadata, responsive layouts, colors and accessibility markup.Text & Productivity ToolsCount, compare, normalize, transform and encode text with fast browser-based utilities.

Local-first processing

Formatters, converters and calculators run in the browser whenever possible.

Remote calls are labeled

Tools that contact DNS, IP, breach or preview services are clearly marked before use.

Built for repeat visits

Stable URLs, favorites, recent tools and keyboard access keep common tasks close.

No tools match that search.

One bench.Every tiny task.

JSON Formatter

JSON Minifier

JSON Diff

JSON to CSV

CSV to JSON

YAML to JSON

XML Formatter

SQL Formatter

SQL Minifier

RegEx Tester

Base64 Encoder

Base64 Decoder

JWT Decoder

URL Encoder

URL Decoder

HTML Entity Encoder

HTML Entity Decoder

SHA-256 Hash

HMAC-SHA256

UUID Generator

Unix Timestamp Converter

Subnet / CIDR Calculator

IPv4 to Integer

Integer to IPv4

IPv6 Expander

DNS Lookup

IP Address Info

Port Reference

HTTP Status Reference

Password Generator

Password Strength

Basic Auth Header

MAC Address Normalizer

WHOIS Shortcut

CIDR Mask Reference

HTML Formatter

HTML Minifier

CSS Formatter

CSS Minifier

JavaScript Minifier

Color Converter

Contrast Checker

Gradient Generator

Box Shadow Generator

Border Radius Generator

CSS Unit Converter

Aspect Ratio Calculator

CSS Clamp Generator

Meta Tag Builder

UTM Builder

QR Code Generator

Image Extractor

Page Outliner

SEO Meta Inspector

Site Stack Detector

HTML Selector Extractor

Word & Character Count

Case Converter

Slug Generator

Sort Lines

Remove Duplicate Lines

Text Diff

Markdown Preview

Text to Binary

Binary to Text

ROT13 Encoder

Morse Code Encoder

Lorem Ipsum Generator

Reverse Text

Unicode Inspector

Normalize Line Endings

Smart Input Detection

JSON Schema Validator

JSONPath Tester

XPath Tester

cURL ↔ Fetch / Axios

API Request Tester

Cron Expression Parser

Semantic Version Calculator

One bench.
Every tiny task.