ToolCozy

All-in-One Online Toolkit · ⌘K Quick Search

AI

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AI Subscription Pricing

Compare AI subscription prices across App Store regions, sorted low→high

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AI Model Rankings

See top AI models by coding / general / image / video / search / music capability

Developer

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JSON Format / Diff

JSON format, beautify, minify & side-by-side diff

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Base64 Codec

Base64 encode & decode with UTF-8 support

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URL Codec

URL encode (encodeURIComponent) & decode

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Timestamp Converter

Unix timestamp ↔ human-readable date/time

UUID Generator

Random UUID v4 generation with batch support

Hash Calculator

Compute MD5, SHA-1, SHA-256, SHA-512 digests

JWT Decoder

Decode JWT tokens, view Header, Payload & expiry status

QR Code Generator

Generate QR code from text or URL, download as PNG / SVG

Unit Converter

Length, weight, temperature, area, volume, data size, time conversion

Number Base

Convert between binary, octal, decimal, and hexadecimal

Data Converter

Convert between CSV, Excel, and JSON formats

SQL Formatter

Format and beautify SQL statements, multi-dialect support

IP Lookup

Look up IP address geolocation, ISP, timezone info

Design

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Image Compress

Compress JPG/PNG/WebP images with quality adjustment, batch support

Color Converter

Convert between HEX / RGB / HSL with visual preview

Image Convert

Convert between JPG/PNG/WebP/HEIC, export as Favicon

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Image Crop

Visually crop images with rotate/flip, preset & custom aspect ratios

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App Store Screenshot

Generate iOS / Android app store preview screenshots with device frames

Text

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Regex Tester

Regex editor with match highlighting & capture groups

Word Counter

Real-time character, word, line, and byte count

Text Diff

Side-by-side text comparison with highlighted differences

Markdown Preview

Live Markdown rendering with GFM and syntax highlighting

About ToolCozy

ToolCozy is a free collection of 22 browser-based utilities for developers, designers, and anyone who deals with text, data, or images on a daily basis. Every tool runs entirely in your browser — your input never leaves the page, so even sensitive content like JWTs, API responses, or internal screenshots stays on your device.

Built for the workflow you already have: paste, click, copy. No accounts, no quota limits, no subscription wall. The site loads as a single tab you can keep pinned, with a Cmd/Ctrl-K command palette that jumps to any tool in two keystrokes.

What's inside

Developer

JSON formatter & diff, Base64 / URL / hash codecs, JWT decoder, regex tester, Unix timestamp converter, UUID generator, number-base converter, IP lookup, SQL formatter, CSV / JSON / Excel converter.

Text

Side-by-side text diff, real-time word & character counter, Markdown live preview with GFM and syntax highlighting.

Design

Image compressor for JPG / PNG / WebP, format converter (HEIC, WebP, favicon export), visual cropper with rotate / flip, HEX ↔ RGB ↔ HSL color converter, App Store / Google Play screenshot generator.

Why browser-based?

Most online tools upload your data to a server — fast to build, but the wrong tradeoff for anything sensitive. ToolCozy uses Web Crypto, Canvas, WebAssembly, and TextEncoder APIs to do everything client-side. You can verify it: open DevTools → Network and watch that no upload requests are made when you compress an image, hash a string, or decode a JWT.

The flip side: very large files (hundreds of MB) might be slow because everything decodes into RAM. For those cases use a CLI. For the 99% case — pasted text, photo from your phone, debug payload — the browser is faster, more private, and saves a server round-trip.