35

ASCII Table - Online Character Code Reference

Interactive ASCII table showing decimal, hex, octal, and binary codes for all standard and extended ASCII characters. A classic programmer reference.

Developer Tools ASCII character code reference table

25

JSON Formatter & Validator - Online JSON Beautifier

Online JSON formatting and validation tool, supporting JSON minify/beautify, syntax highlighting, and error locating. Data processed locally in browser for security.

Developer Tools beautify formatter JSON validator

23

npm Version Range Checker - Online SemVer & Tilde Caret

Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.

Developer Tools checker npm range semver

21

Test Credit Card Validator - Online Luhn Check & Issuer

Paste a test card number to verify Luhn algorithm, identify issuer (Visa, MC), and check length. No real data.

Developer Tools credit card Luhn test validator

21

PRNG Validator - Online Check Randomness Pattern

Paste a list of numbers to visually check uniformity, mean, and simple pattern analysis. Educational tool for statistics and RNG.

Developer Tools PRNG random statistics validator

21

Dynamic Placeholder Image Service - Online Test Images

Generate dynamic placeholder images by specifying width, height, colors, and text. View instantly as a URL you can embed in mockups. Canvas-based.

Developer Tools dynamic image mockup placeholder

21

RegEx Tester - Online Regular Expression Builder & Matcher

Build and test regular expressions against sample text. Real-time match highlighting, capture groups display, and flavor options. All inside your browser.

Developer Tools builder regex regular expression tester

20

Batch Image to Base64 Encoder - Online Multiple Files

Convert multiple images to Base64 data URIs at once. Copy individually or as a JSON array. Great for inline assets. Local.

Developer Tools Base64 batch data URI image

20

Gray Code Converter - Online Binary to Reflected Code

Translate between binary and Gray code (reflected binary code). See the bit changes. Useful for digital logic.

Converter binary converter Gray code logic

20

Gradient Match Game - Online Drag & Match Linear CSS

Recreate the target CSS linear gradient by adjusting stops and colors. A unique game for front‑end developers to master gradients.

Developer Tools CSS game gradient match

20

Gradient Text CSS Generator - Online Colorful Text Style

Create text with a gradient fill using CSS background-clip. Configure colors and direction. Copy the code. Works in modern browsers.

Developer Tools colorful CSS generator gradient text

20

Crontab Expression Editor - Online Interactive Cron Builder

Build cron expressions using a visual editor with dropdowns. See human-readable description and next run times. Easier than raw cron.

Developer Tools cron crontab editor scheduler

20

Code Screenshot Generator - Online Carbon Code Image Maker

Create beautiful, syntax-highlighted screenshots of your code snippets. Choose themes and export as PNG. All client-side canvas rendering.

Developer Tools code screenshot image share syntax

20

XML Formatter & Validator - Free Online XML Beautifier

Easily format, validate, and beautify XML documents. Minify XML data with a single click. All processing happens locally in your browser for maximum privacy.

Developer Tools beautify formatter validator XML

19

CSS Checkerboard Pattern - Online Background Generator

Create a customizable checkerboard or grid background using pure CSS gradients. Adjust cell size and colors. Copy the code.

Developer Tools checkerboard CSS generator pattern

19

Z‑Index Stacking Context Tester - Online Layering Debugger

Paste HTML/CSS snippets or enter properties to test how z‑index and stacking contexts interact. Real‑time example.

Debugging CSS debug stacking context z‑index

19

Image to CSS Grid Layout - Online Pixel‑Based Generator

Upload a small pixel art image and get a CSS grid layout that recreates it using divs. Novelty developer tool.

Developer Tools CSS grid generator image pixel

19

Website Color Theme Extractor - Online Grab Palette from CSS

Fetch a website's CSS and extract :root custom properties (‑‑color) to reveal its design token palette. For learning and inspiration.

Color Tool CSS extract palette theme

19

Regex Visualizer - Online Railroad Diagram Generator

Enter a regular expression and see a visual railroad diagram explaining the pattern. Learn and debug regex.

Developer Tools debug diagram regex visualizer

19

CSS‑Only Accordion Builder - Online No JavaScript FAQ

Configure and generate a pure CSS accordion with details/summary styling. Copy the HTML/CSS. Accessible and lightweight.

Developer Tools builder CSS accordion FAQ no JS

19

Focus Order Analyzer - Online Tab Navigation Check

Enter a URL and extract tab‐index order violations and focusable elements. Quick accessibility audit. Client‑side fetch.

Accessibility accessibility focus keyboard tabindex

19

Markdown Table Generator - Online Visual Builder & Formatter

Create and format Markdown tables by adjusting rows and columns. Align text, copy the raw Markdown. Perfect for README files.

Developer Tools generator maker Markdown table table

19

Is It Down or Just Me - Online Website Uptime Checker

Check if a website is globally reachable or experiencing issues. Status code and latency displayed. Quick browser-side test.

Developer Tools checker status uptime website down

19

Cron to Text Translator - Online Explain Cron Schedules

Enter a cron expression and get a plain English description of when it runs. Understand complex schedules instantly. Developer friendly.

Developer Tools cron explanation schedule translator

19

File Encoding Checker - Online Detect Text File Charset

Upload a text file to detect its character encoding (UTF-8, ISO-8859-1, etc.) and BOM presence. Runs entirely in your browser.

Developer Tools charset detector file encoding UTF-8

19

GraphQL Playground - Online Query & Schema Explorer

Execute GraphQL queries against any endpoint with variables and headers. Explore schema via introspection. All requests made directly from your browser.

API API GraphQL query schema

19

Number Base Converter - Online Binary Octal Decimal Hex

Convert numbers between binary, octal, decimal, and hexadecimal bases. See real-time conversion as you type. Clean and simple programmer utility.

Converter binary converter hex number base

19

Text Diff Checker - Online Compare & Find Differences

Compare two text blocks and highlight differences line by line. Ideal for code review and document revisions. All diffs computed locally for privacy.

Developer Tools code compare diff checker text difference

19

Open Graph Generator - Online OG Meta Tags Builder

Build perfect Open Graph meta tags for rich social media previews. Preview how your link will look on Facebook and LinkedIn. Structured data tools for better CTR.

Developer Tools Facebook meta OG Open Graph

19

Box Shadow CSS Generator - Online Shadow Effect Designer

Design layered box shadows interactively and get the CSS code in real time. Adjust offset, blur, spread, and color. Essential tool for UI designers.

Developer Tools box shadow CSS design generator

19

SQL Formatter & Beautifier - Online SQL Query Cleaner

Format and beautify SQL queries for improved readability. Supports various SQL dialects. Quick syntax highlighting and local processing ensure a secure experience.

Developer Tools beautifier formatter query SQL

18

Responsive Image CSS - Online Art Direction & Srcset

Upload an image at multiple widths and generate a complete <picture> or <img srcset> snippet. Modern web performance.

Developer Tools images picture responsive srcset

18

PWA Manifest Generator - Online Create app.webmanifest

Fill in your PWA details to generate a valid manifest.json file. Include icons, theme color, display mode.

Developer Tools generator manifest PWA web app

18

CSS Tooltip Generator - Online Hover Popup Builder

Design a pure CSS tooltip with custom text, position (top/bottom/left/right), and arrow. Copy the clean code.

Developer Tools CSS generator hover tooltip

18

Image Format MIME Checker - Online Identify True Type

Drop an image that might have wrong extension and see its real format (JPEG, PNG, WebP) based on header bytes.

Developer Tools checker format image MIME

18

CSS Grid Playground - Online Interactive Layout Builder

Experiment with CSS Grid properties visually. Add rows, columns, and areas. See the grid in action and copy the code.

Developer Tools builder CSS Grid layout playground

18

JavaScript Type Checker - Online Typeof & Instanceof Sandbox

Paste any JavaScript expression and see its evaluated type and value. Understand JS coercion and type quirks. Educational.

Developer Tools JavaScript sandbox type typeof

18

Base64 String Validator - Online Check Valid Encoding

Paste a string and verify if it is valid Base64. Auto‑detects padding issues and character errors. Quick dev check.

Developer Tools Base64 check encoding validator

18

Text Diff to Image - Online Compare & Export as PNG

Paste two texts, compute the diff, and render the result as a highlighted image. Easier to share changes visually.

Developer Tools compare diff image text

18

Swagger/OpenAPI YAML Previewer - Online Render & Test

Paste your Swagger/OpenAPI YAML and see a rendered API documentation preview with expandable endpoints. All local rendering.

API OpenAPI preview Swagger YAML

18

Bit Density Visualizer - Online File Binary Viewer

Upload a small file to see each byte as a block, color-coded by value. Visualize the structure of binary data. Client-side.

Developer Tools binary bits file visualizer

18

Decimal to IEEE 754 Converter - Online Float Representation

Convert a decimal number to 32-bit single precision IEEE 754 format. See sign, exponent, mantissa bits. Developer tool.

Converter binary converter float IEEE 754

18

Page Speed Simulator - Online Estimate Load Metrics

Enter a URL and get a rough client-side performance simulation: request count, DOM size, and potential speed tips. No real Lighthouse.

Developer Tools Lighthouse page speed performance simulator

18

Mermaid Diagram Renderer - Online Flowchart & UML Editor

Write Mermaid markdown and instantly see the rendered flowchart, sequence diagram, or Gantt chart. Copy SVG output. Browser-side rendering.

Developer Tools diagram flowchart Mermaid UML

18

Docker Commands Cheatsheet - Online Quick Reference

A searchable list of essential Docker CLI commands for managing containers, images, and volumes. Copy-paste friendly. Always handy.

Developer Tools cheatsheet commands Docker reference

18

Git Cheatsheet - Online Common Commands Reference

Quick reference for frequently used Git commands with examples. Searchable and categorized. A handy resource for all developers.

Developer Tools cheatsheet commands Git reference

18

NPM Package Name Generator - Online Unique Name Checker

Generate creative, available npm package names and check if a name is already taken on the registry. Quick and fun for developers.

Developer Tools availability generator npm package name

18

HTML Sanitizer - Online Clean Dangerous Tags & XSS Prevention

Strip dangerous HTML tags and attributes (scripts, onclick) to prevent XSS attacks. Safe iframe preview. Local sanitation engine.

Developer Tools clean HTML sanitizer security XSS

18

Responsive Design Tester - Online Viewport Emulator

Preview any website inside emulated device viewports (iPhone, iPad, various resolutions). No screenshot, live interaction in an iframe. Local tool.

Design emulator mobile responsive test viewport

18

DNS Lookup - Online Domain Records Checker (A, MX, CNAME)

Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.

Developer Tools DNS domain lookup records

18

HTTP Headers Checker - Online Inspect URL Response Headers

Enter a URL and see the full HTTP response headers returned by the server. Detect redirects and server type. Useful for SEO and web debugging.

Developer Tools checker HTTP headers response server

18

HTML to Markdown Converter - Online Clean Content Extractor

Strip HTML tags and convert web content to plain Markdown. Preserve headings, lists, and links. Perfect for content migration. All processing in browser.

Converter converter extract HTML Markdown

18

JSON to XML Converter - Online Data Interchange Tool

Seamlessly convert JSON objects into valid XML documents. Control root element naming and attribute formatting. Entirely local, keeping your data safe.

Converter converter data interchange JSON XML

18

Data Storage Converter - Online Byte KB MB GB TB Tool

Convert between digital storage units: bits, bytes, kilobytes, megabytes, gigabytes, and more. Binary and decimal interpretations available. A developer must-have.

Developer Tools byte converter data storage gigabyte

18

Unix Timestamp Converter - Online Epoch & DateTime Tool

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Ideal for developers debugging time-related code.

Converter converter date epoch Unix timestamp

18

Markdown Previewer - Online Live MD to HTML Renderer

Write Markdown and see the formatted HTML preview in real time. Syntax highlighting and GitHub-flavored Markdown support. No upload, fully local.

Developer Tools HTML Markdown MD previewer

18

Meta Tag Generator - Online SEO & Social Meta Tags Creator

Generate comprehensive HTML meta tags for SEO and social sharing (Open Graph, Twitter Cards). Copy ready-to-use code. Boost your search visibility.

Developer Tools generator meta tags Open Graph SEO

18

Border Radius CSS Generator - Online Rounded Corners Tool

Easily create asymmetric border radius values and preview the result. Copy the generated CSS instantly. All interactively and browser-based.

Developer Tools border radius CSS design generator

17

Promise State Viewer - Online Check Resolve & Reject

Create promises that resolve or reject after a delay. See state changes and chain .then/.catch. Debug async code.

Developer Tools async JavaScript Promise state

17

Simple Hash Generator - Online DJB2 & CRC32

Hash any text using simple, fast algorithms: DJB2, SDBM, or CRC32. Get integer or hex. For quick lookups. Local.

Developer Tools CRC32 DJB2 generator hash