All Developer Tools

Browse our complete collection of 94 free online developer tools. All tools run locally in your browser for maximum privacy and speed.

AI Tools

4 tools
AI Prompt PII & Secret Leak Scanner
Detect and redact sensitive data before sharing AI prompts
AI Coding Prompt Generator
Choose what you want the AI to do and get a prompt structured for that coding task.
Task Handoff Compiler
Turn messy requirements into an execution-ready engineering handoff with readiness checks, scope guards, and validation plans.
AI Token & Cost Calculator
Count tokens and compare AI model costs

JSON Tools

4 tools
JSON Formatter
Format and beautify JSON data
JSON Schema Validator
Validate JSON against schemas
JSON to TypeScript
Generate TypeScript interfaces
Array Sorter & Shuffler
Sort and shuffle arrays and objects
CSV ⇄ JSON Converter
Convert between CSV and JSON
CSV Editor
Edit CSV files like a spreadsheet

XML & YAML

4 tools
YAML ⇄ JSON Converter
Convert between YAML and JSON
XML ⇄ JSON Converter
Convert between XML and JSON formats
YAML Viewer
View, parse, and validate YAML with tree view
XML to Java Class Converter
Convert XML to annotated Java classes with JAXB & Lombok support

Web & Code

7 tools
JavaScript Beautifier & Minifier
Format or minify JavaScript
CSS Beautifier & Minifier
Format, optimize, and minify CSS code
HTML Beautifier & Minifier
Format, optimize, and minify HTML code
Regex Tester
Test regular expressions interactively
Source Map Stack Trace Resolver
Decode minified stack traces with source maps
Color Converter
Convert colors across CSS, mobile, and design-token formats
HTML CSS JS Playground
Write frontend code, run it safely, and debug the result in your browser.
Schema Markup Validator
Validate JSON-LD schema markup and rich result readiness
Broken Link Checker & Cleaner
Find, remove, and replace dead URLs from text, files, and webpages
Open Graph Previewer
Preview social cards and debug Open Graph, Twitter Card, and HTML metadata
String Case Converter
Convert text case formats
Markdown Editor & Previewer
Live markdown editor with preview
Lorem Ipsum Generator
Generate placeholder text for your designs instantly
Word Counter
Count words, characters, sentences and paragraphs instantly
HTML to Markdown Converter
Convert HTML and webpages into clean Markdown
QR Code Generator
Generate QR codes instantly from URLs, text, or JSON — no backend needed
Code Screenshot Generator
Create beautiful, shareable images of your code
Image to WebP Converter
Convert images to WebP format instantly in your browser
Screenshot to Text & Code
Extract text and code from screenshots with local OCR
Animated QR File Transfer
Transfer small files through animated QR codes with no upload, account, network, or pairing.
Profile Picture Badge Generator
Add an available-for-work, hiring, freelancer, event, or custom badge to your profile picture.
Open Graph Image Builder
Create branded social preview images and metadata-ready assets
Screenshot Image Annotator
Highlight, explain, redact, and present screenshots
LinkedIn Carousel Generator
Design editable LinkedIn PDF carousels in a horizontal WYSIWYG workspace
Screenshot Full Webpage
Capture public webpages as full-page or viewport images
Browser P2P File Transfer
Send files directly between two browsers using WebRTC. No upload, no account, no server storage.
Browser Video Call
Make a direct one-to-one P2P video call with screen sharing and private browser-to-browser chat.
Video Picture-in-Picture
Keep a local video, direct URL, webcam, or screen capture visible while you work.
Music Player
Play private local audio, arrange a playlist, and keep compact controls visible while you work.
Age Calculator
Calculate age from birth date
Unit Converter
Developer-focused unit converter for data sizes, rates, time, and more
Decimal Precision Calculator
Precise decimal calculations

Hashing

3 tools
MD5 Generator
Generate MD5 hash from text or files
SHA256 Hash Generator
Generate SHA256 hashes
SHA512 Hash Generator
Generate SHA512 hashes
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text
URL Encoder & Decoder
Encode text to URL-safe format or decode percent-encoded strings back to text
HTML Escape & Unescape
Encode HTML entities or decode them back — in one workspace
Image ↔ Base64 Converter
Convert images to Base64 and decode Base64 back to images
JWT Decoder
Decode JWT tokens
Password Generator
Generate secure passwords
JWT Generator
Generate JWT tokens with HS256
ENV Diff Comparator
Compare, audit & merge .env files with secret detection
ZIP with Password
Compress & encrypt files locally — no upload, no server.
Password Strength Checker
Test password strength and predictable patterns privately
HTTP Header Parser
Parse HTTP headers
Swagger / OpenAPI Viewer
Visualize and explore OpenAPI 3.x and Swagger 2.0 specs instantly
Mini Postman (API Tester)
Test REST APIs directly in your browser — no install needed
Internet Speed Test
Check download speed, latency, jitter, and upload availability from your browser
Mixpanel Toolkit
Local Mixpanel event sandbox
cURL to Code Converter
Convert HTTP requests across cURL, code, HAR, and structured formats with local secret protection.
Local Port Scanner
Automatically find localhost development servers
Dev Service Status
Check GitHub, OpenAI, Claude, Vercel, Cloudflare, npm and other developer services in one place.
Web Technologies Detector
Find a website's publicly detectable tech stack with evidence
Unix Timestamp Converter
Convert timestamps to dates
Timezone Converter
Convert between timezones
ISO8601 Formatter
Format and parse ISO8601 dates
Cron Expression Generator
Build, validate, and visualize cron schedules with timezone-aware simulation
Work Hours Calculator
Calculate work hours, WFO/WFH count, leave, business trips, client visits, and overtime using your company rules.
Pomodoro Timer
Run accurate focus and break cycles, track daily progress, and keep the timer visible.
Stopwatch
Measure drift-free elapsed time, record lap statistics, and save or export sessions locally.
Event Countdown
Create precise, time-zone-aware countdowns, count-ups, and date-range progress trackers.
Wheel of Names
Random Name Picker & Wheel Spinner

Document

3 tools
Document Picture-in-Picture
Upload or open a document and keep its scrollable preview visible while you work.
Floating Notes
Write private notes and checklists that autosave locally and stay visible in a floating view.
ATS CV/Resume Builder
Create, verify, score, and export an ATS-friendly resume

Financial

3 tools
Currency Formatter
Format currency values
Number to Words Converter
Convert numbers to words in English and Indonesian with currency and check writing support
Invoice Generator
Create professional PDF invoices locally with accurate totals, branding, and reusable history.
UUID/GUID Generator
Generate unique identifiers instantly
Fake Data Generator
Generate mock data
Commit Message Generator
Generate conventional commits
Gitignore Generator
Generate production-ready .gitignore files for any tech stack
GitHub Profile README Builder
Build a credible, project-first GitHub profile README that stays clean and GitHub-safe
Form Validation Generator
Design validation once and generate framework-neutral code.
SemVer Release Advisor
Decide the exact next version from your release changes
Code Diff Checker
Compare code/text side-by-side
JSON Diff Checker
Spot every change between two JSON objects instantly
CSV Diff Checker
Compare two CSV files with key-based diff and field-level change detection
PDF Diff Checker
Compare PDF text, pages, and visual changes locally

Explore Developer Workflows

Browse focused collections, common development tasks, and practical tool comparisons.

Tool Categories
Explore tools grouped by technical domain.
AI ToolsJSON ToolsCSV & TablesXML & YAMLWeb & CodeSEO & Web AnalysisText & MarkdownImages & QRBrowser & MediaNumbers & UnitsHashingEncoding & EscapingCredentials & PrivacyAPI & NetworkingTime & SchedulingProductivityDocumentFinancialDeveloper WorkflowCompare & Validate
Use Cases
Start from the development task you need to complete.
Tools for DebuggingCode Formatting ToolsData Conversion ToolsAPI Development ToolsHashing & Security ToolsText Processing Tools
Tool Comparisons
Choose the right workflow for your data and security needs.
JSON Formatter vs JSON ValidatorYAML vs JSON ConverterMD5 vs SHA-256 Hash GeneratorJWT Decoder vs JWT GeneratorBase64 vs URL EncodingCSV vs JSON Format Comparison

Why Use Our Developer Tools?

🔒 Privacy-First

All tools run entirely in your browser. Your data never leaves your device, ensuring complete privacy and security.

⚡ Lightning Fast

Client-side processing means instant results with no server delays or network latency. Tools work offline too.

🆓 100% Free

No registration, no subscriptions, no hidden fees. All tools are completely free to use without any limitations.

🌍 Multi-Language

Available in 10 supported languages including English, Chinese, Japanese, Russian, and more. Choose your preferred language anytime.

Popular Tool Categories

  • Data Formats: Format, validate, and convert JSON, YAML, CSV, XML, and tabular data
  • Web & Code: Test regex, format code, run browser playgrounds, and resolve stack traces
  • SEO & Web Analysis: Preview OpenGraph metadata, validate schema markup, and check broken links
  • Text & Markdown: Edit Markdown, transform HTML, count words, and process text
  • Browser & Media: Use Picture-in-Picture, browser transfers, video calls, screenshots, and media tools
  • Productivity: Run Pomodoro sessions, track time, plan countdowns, and pick names fairly
  • Security & Privacy: Generate hashes, passwords, JWTs, and privacy-safe credentials

How to Use Our Tools

  1. Select any tool from the categories above
  2. Paste or type your input data
  3. Get instant results - no processing delay
  4. Copy, download, or share your results
  5. All data stays on your device for privacy

CodingTool is officially live on

Launched on StartupBaseCodingTool.dev - Free, Fast & Easy Developer Tools in One Place | Product HuntCodingTool - Featured on Startup FameFazier badgeListed on Turbo0Featured on Twelve ToolsFeatured on Findly.tools