68 free tools · Developer Tools
Free online
Developer tools.
A full developer toolbox in the browser: regex testing, API requests, SQL and GraphQL formatting, UUID generation, timestamps, JWT decoding, diffs, and schema viewers. No install, no signup, and your code never leaves your machine.
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68 tools · Free to use
Regex Tester & Builder
Test and build regular expressions with real-time matching and detailed explanations.
Text Processing
UUID Generator
Generate universally unique identifiers with support for different versions and bulk generation.
Data Formats
UUID v4 Generator
Generate random UUID v4 identifiers instantly — single or bulk up to 1000, in standard, compact, braces, or URN format.
Data Formats
UUID v7 Generator
Generate time-ordered UUID v7 identifiers — sortable, database-friendly, RFC 9562 compliant. Single or bulk up to 1000.
Data Formats
XSD Schema Viewer
Open and explore XML Schema Definition (XSD) files with interactive type navigation and detailed property analysis.
Data Formats
Online Diff Checker
Compare two text documents side-by-side with highlighted differences. Line-by-line comparison with additions, deletions, and modifications.
Text Processing
Unix Timestamp Generator & Converter
Convert between Unix timestamps and human-readable dates. Generate current timestamps, convert to different timezones, and understand epoch time.
Data Formats
SQL Formatter & Beautifier
Format and beautify SQL queries with syntax highlighting, multiple dialect support, and customizable formatting options.
Database
Regex Offline AI
AI-powered Regex Generator. Generate, test, and validate regular expressions with AI assistance.
Text Processing
Code Snippet Screenshot
Create beautiful screenshots of code snippets with customizable backgrounds, syntax highlighting, and social media branding. Perfect for sharing on Twitter, LinkedIn, and presentations.
Coding
Crontab Generator
Build and understand cron expressions with live description and next run times. Includes presets and cheatsheet.
Productivity
JSON to TypeScript Converter
Convert JSON objects to TypeScript interfaces instantly with customizable options and clean code generation.
Coding
GraphQL Schema Viewer & Validator
Visualize, validate, and explore GraphQL schemas (SDL) with an interactive type explorer and beautifier.
Database
Notepad++ Online
Notepad++ style tabbed editor that runs in the browser — syntax highlighting and auto-save on macOS, Linux and ChromeOS, with nothing to install.
Coding
JWT Decoder / Encoder
Instantly decode, verify, and generate JSON Web Tokens (JWT) locally in your browser. Supports HS256, RS256, and more.
Security
Open Graph Preview
Preview and debug your Open Graph (OG) meta tags and Twitter Cards instantly. Auto-fetch from URLs.
Design
API Tester
Test your REST APIs online instantly. A fast, free, and 100% client-side browser API testing tool with syntax highlighting, code snippets, and detailed responses.
Coding
Hash Generator
Secure, client-side hash generator supporting MD5, SHA-256, bcrypt, and more. Hash texts or files instantly offline.
Security
MD5 Hash Generator
Generate MD5 checksums from text or files instantly. 100% client-side — verify downloads and deduplicate files without uploading anything.
Security
SHA-256 Hash Generator
Compute SHA-256 hashes of text and files instantly. 100% client-side — verify release checksums and fingerprint data without uploading anything.
Security
JSON Semantic Diff & Compare
Compare two JSON objects semantically using our privacy-first, client-side tool. Identify structural differences, ignore key order and formatting effortlessly.
Data Formats
OpenAPI & Swagger Viewer
Open an OpenAPI 3.x or Swagger 2.0 file in JSON or YAML and explore endpoints, parameters, schemas, and responses in an interactive UI.
Coding
LLM Token Counter
Count tokens and estimate API cost for GPT-5, GPT-4o, Claude, Gemini, Llama and more — exact tiktoken counts, 100% in your browser.
Coding
GraphQL Formatter & Beautifier
Format, validate, and beautify GraphQL queries, mutations, and schemas with syntax highlighting and query analysis.
Database
GraphQL Minifier
Minify GraphQL queries and schemas into compact single-line strings — smaller payloads, ready to embed in code.
Database
GraphQL Validator
Validate GraphQL queries, mutations, and schemas as you type — syntax errors flagged with line numbers, plus query analysis.
Database
Password Generator
Generate strong random passwords with cryptographically secure randomness — length, character sets, and strength meter, all on your device.
Security
XML Formatter & Validator
Format, validate, minify and explore XML with a tree viewer and XPath tester — entirely in your browser.
Data Formats
YAML Formatter & Beautifier
Format and beautify YAML without losing comments or anchors, and catch the mistakes that still parse.
Data Formats
REST API Tester
Test REST endpoints from your browser with custom methods, headers, parameters, and request bodies.
Coding
HTTP Request Tester
Compose an HTTP request, adjust its headers and body, and inspect the server response in one browser workspace.
Coding
Code to Image
Turn a code snippet into a styled image with syntax highlighting, background choices, and PNG export.
Coding
Code Screenshot Generator
Create a clean screenshot-style PNG of your code with adjustable presentation and optional social branding.
Coding
Cron Expression Generator
Build a cron schedule from common presets and inspect its description and upcoming run times before copying it.
Productivity
Cron Expression Parser
Read a cron expression in plain language and inspect its next scheduled runs in a browser-based workspace.
Productivity
Text Compare
Compare two versions of text side by side and inspect highlighted additions, deletions, and changed lines.
Text Processing
Text Diff
Inspect a line-by-line text diff with visible insertions and deletions, entirely in your browser.
Text Processing
GraphQL Schema Validator
Check GraphQL schema definitions and inspect reported syntax or schema errors locally.
Database
GraphQL Schema Explorer
Browse GraphQL types, fields, and definitions in a searchable schema workspace.
Database
JSON Compare
Compare two JSON documents and inspect differences in their values and structure.
Data Formats
JSON Diff
Find changes between JSON inputs in a browser-local diff workspace.
Data Formats
JSON to TypeScript Interface
Generate TypeScript interfaces from a JSON sample with configurable property and export options.
Coding
JSON to TS
Turn JSON data into TypeScript interface declarations ready to review and copy.
Coding
JWT Decoder
Decode a JWT header and payload locally to inspect the token's visible claims.
Security
JWT Encoder
Encode JWT header and payload data in a local workspace for development and inspection.
Security
Token Counter
Count tokens in text with local tokenizers and compare the available model estimates.
Coding
AI Token Counter
Estimate the token length of AI prompts and inspect how the selected tokenizer affects the count.
Coding
Open Graph Checker
Inspect accessible page metadata and preview the title, description, and image used for link sharing.
Design
Social Media Preview
Preview a public link's detected sharing metadata in a browser-based inspection workspace.
Design
Swagger Viewer
Browse supported OpenAPI and Swagger-style API documents in a local reference workspace.
Coding
OpenAPI Editor
Edit an API specification's source and browse the parsed operations and schemas alongside it.
Coding
Random Password Generator
Generate random passwords locally with configurable length and character choices.
Security
Strong Password Generator
Create long, random passwords with control over symbols, numbers, and letter cases.
Security
Regex Generator
Generate a draft regular expression from a description using a browser-run AI model.
Text Processing
Regex Explainer
Ask a local AI model to explain a regular expression in plain language.
Text Processing
JavaScript Regex Tester
Test JavaScript regular expressions against sample text with visible match results.
Text Processing
Regex Checker
Check regex syntax and inspect matches in a browser-based testing workspace.
Text Processing
SQL Formatter
Format SQL queries with selectable dialect and indentation settings in your browser.
Database
SQL Beautifier
Beautify SQL text with consistent spacing and indentation for easier reading.
Database
Epoch Converter
Convert Unix epoch timestamps into readable dates and generate timestamps from date inputs.
Data Formats
Unix Timestamp Converter
Translate Unix timestamps to dates and convert selected date values back into numeric timestamps.
Data Formats
XML Validator
Check XML well-formedness and inspect parser issues in a browser-local workspace.
Data Formats
XML Viewer
Read XML source and inspect its parsed structure in a browser-based viewer.
Data Formats
XSD Viewer
Browse XML Schema definitions and inspect their elements and type declarations.
Data Formats
XSD Editor
Edit XSD source and inspect the schema's parsed structure in your browser.
Data Formats
YAML Beautifier
Format YAML with consistent layout and inspect the parsed result before copying it.
Data Formats
YAML Minifier
Create compact YAML output using the formatter's minify action and review the result locally.
Data Formats
JSON Viewer
View JSON as a collapsible tree, table or formatted text, with search and one-click JSONPath copying.
Data Formats
A quick guide
Choosing the right Developer tools
Find utilities for inspecting data, formatting code, testing patterns, and understanding API responses. A formatter improves readability; a validator checks syntax; a diff shows changes. API testing sends the request you configure to your chosen endpoint directly from the browser, so that endpoint's access rules still apply.
Digital ToolPad brings together 68 free Developer tools in one collection. Open a tool, add your input, and review the result on your device. All tool processing happens in your browser, without uploading your data to our servers for processing.
Why use these instead of installing a desktop toolbox app?
You get the same utilities with nothing to install, on any OS — Windows, Mac, Linux, or even a locked-down work machine — and unlike paid desktop toolboxes, everything here is free.
Can I use these tools with proprietary code and data?
Yes. Every tool processes input locally in your browser, so proprietary code, API payloads, and connection strings never leave your machine. Verify it yourself in the browser's Network tab.
Do these tools work offline?
Most do — once the page is loaded, formatting, generating, and testing run entirely client-side without any server round-trips.
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