ToolHub

Free online developer tools, private by default

Format, convert, validate, and generate without an account. Most tools keep input in your browser, while network-dependent tools are clearly marked.

Free · no account
39 of 41 tools run locally · 2 use the server
Ad-free interface
5 localized versions

See how local processing works

Converters Generators Development Tools Image Tools JSON Tools

Free Online Developer Tools

K

JSON Formatter Base64 Converter URL Encoder Timestamp Converter

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What should you know before using these online developer tools?

ToolHub brings browser-based developer utilities for formatting, converting, validating, testing, and generating data into one place. These quick answers cover cost, privacy, supported coding tools, JSON workflows, and browser compatibility.

Converters

JSON Formatter

Local

Format, minify, and validate JSON data.

Base64 Converter

Local

Encode and decode Base64 strings.

URL Encoder

Local

Encode and decode URLs.

Timestamp Converter

Local

Convert Unix timestamp to human date and vice-versa.

Number Converter

Local

Convert between Binary, Octal, Decimal, and Hex.

Color Converter

Local

Convert HEX, RGB, and HSL colors.

YAML <-> JSON

Local

Convert between YAML and JSON formats.

XML Formatter & Validator

Local

Format, minify, and validate XML locally.

CSV to JSON Converter

Local

Convert CSV or TSV to JSON and back.

JSON to TypeScript

Local

Generate TypeScript interfaces from JSON samples.

JSON to JSON Schema

Local

Infer a Draft 2020-12 JSON Schema from sample JSON.

JSON to Zod

Local

Generate Zod schemas from sample JSON.

JSON to Go

Local

Generate Go structs and JSON tags from sample JSON.

TOML <-> JSON

Local

Convert TOML and JSON in both directions while preserving strings and dates.

XML <-> JSON

Local

Convert XML and JSON with predictable attribute and text mappings.

Generators

QR Code Generator

Local

Generate QR codes for text or URLs.

Password Generator

Local

Generate secure, random passwords.

UUID Generator

Local

Generate random UUIDs (v4).

Hash Generator

Local

Calculate MD5, SHA-1, SHA-256 hashes.

Lorem Ipsum Generator

Local

Generate placeholder text for specific needs.

Development Tools

Cron Parser

Local

Parse Cron expressions and calculate execution times.

Markdown Preview

Local

Live Markdown to HTML preview.

Text Diff Viewer

Local

Compare two texts and find differences.

Regex Tester

Local

Test and debug regular expressions.

JWT Decoder

Local

Decode JSON Web Tokens headers and payload.

SQL Formatter

Local

Prettify and standardise SQL queries.

SQL to GORM

Local

Convert SQL table schema to GORM model struct.

Open Port Checker

Server

Check if a specific port is open on a host.

IP Location

Server

Find geolocation, ISP, and other details of an IP address.

CSS Minifier

Local

Minify or format CSS code.

JSON Schema Validator

Local

Validate JSON against Draft-07 or 2020-12 schemas.

JSONPath Tester

Local

Evaluate JSONPath expressions and inspect matching values and paths.

JSON Compare

Local

Compare JSON semantically and generate an RFC 6902-style patch.

URL Parser

Local

Parse URL components and edit duplicate query parameters safely.

CIDR Calculator

Local

Calculate IPv4 and IPv6 CIDR networks, ranges, masks, and host counts.

XPath Tester

Local

Evaluate XPath 1.0–3.1 expressions against XML and inspect typed results.

cURL Converter

Local

Convert common cURL commands to Fetch, Axios, or Python Requests.

HMAC Generator

Local

Generate and verify HMAC-SHA signatures with text, hex, or Base64 input.

AES-GCM Encrypt/Decrypt

Local

Encrypt and decrypt text with password-derived AES-256-GCM keys.

Image Tools

Image Compressor

Local

Compress images to reduce file size.

Image Converter

Local

Convert images to JPG format.

Is every ToolHub utility free?

Yes, every coding tool on ToolHub is available without payment, registration, or a trial timer. Open a utility, paste or upload supported input, and use the result immediately.

Is my data private when I use ToolHub?

Most formatters, generators, and data converters run locally with browser APIs and downloaded JavaScript. Network-dependent utilities use the ToolHub server and display a Server badge, so you can check the processing path before entering data.

See the complete privacy and processing list

What can I do with ToolHub?

The collection focuses on frequent development tasks instead of unrelated consumer utilities. Use the table to match a programming need with the relevant online tools.

Development need	Example tools
Format and validate data	JSON, XML, SQL, CSS, JSON Schema
Convert data and code	CSV, YAML, TOML, XML, TypeScript, Go, Zod
Inspect and test	JSONPath, XPath, Regex, JWT, CIDR, cURL
Generate secure values	UUID, passwords, HMAC, hashes, AES-GCM

Which JSON and data conversion tool should I choose?

Choose the smallest developer tool that matches the job rather than moving sensitive data through a generic editor. Each focused page explains examples, processing location, and known limits for its task.

Format or minify JSON and report syntax errors
Convert JSON to CSV, YAML, TOML, XML, or code types
Validate data with JSON Schema Draft-07 or 2020-12
Compare documents or evaluate JSONPath expressions

Browse the complete JSON toolkit

How can I build a faster developer workflow?

Search by task, confirm the Local or Server badge, and read the examples before processing production data. Favorites and recently used items keep recurring tasks one click away.

Search the tool catalog instead of opening multiple websites
Favorite utilities used in recurring development tasks
Check privacy, input limits, and supported standards
Use the focused JSON hub for related data operations