Developer Tools
An array of client-side developer utilities designed to make formatting, debugging, parsing, and testing strings hassle-free.
- 19 free tools
- No sign-up required
- Results in your browser
All Developer Tools
19 tools available
JSON Compare
Compare two JSON objects side-by-side with highlighted diffs for added, removed, and changed keys.
JSON Viewer
Visualize and navigate JSON data as an interactive collapsible tree with search and key path copying.
Base64 Encoder & Decoder
Encode text or files to Base64 and decode Base64 strings back to text, images, or files instantly.
URL Encoder & Decoder
Encode special characters in URLs, decode percent-encoded strings, and parse URL query parameters.
UUID Generator
Generate cryptographically secure v4 UUIDs instantly in bulk or single format with custom casing.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes from text or files simultaneously.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa with live counter and timezone support.
SQL Formatter
Format and indent raw SQL queries online with support for multiple SQL dialects and keyword casing.
HTML Formatter
Format, beautify, and minify HTML markup with configurable indentation and sandboxed live preview.
CSS Formatter
Beautify, sort properties, and minify CSS, SCSS, and Less code online for clean stylesheets.
JavaScript Formatter
Format, beautify, and minify JavaScript and TypeScript code with configurable brace and quote styles.
Duplicate Row Remover
Remove duplicate lines from text or duplicate rows from CSV data with column-based key matching.
CSV to JSON
Convert CSV data to JSON objects or arrays with automatic delimiter detection and table preview.
JSON to CSV
Convert JSON arrays to flat CSV format with nested object dot-notation flattening and column filtering.
XML Formatter
Format, beautify, and minify XML markup with real-time syntax validation and comment preservation.
Barcode Generator
Generate 1D barcodes in 8 formats including Code 128, EAN-13, and UPC-A with SVG and PNG export.
QR Code Generator
Create custom QR codes for URLs, WiFi, vCards, and text with custom colors and logo overlay.
Flexbox Generator
Build CSS flexbox layouts visually with real-time preview, item overrides, and clean CSS code generation.
CSS Grid Generator
Design 2D CSS grid layouts visually with column/row track editors, template area naming, and presets.
Overview
About developer tools
Developer tools are utility programs that aid software engineers in writing, debugging, formatting, and analyzing data and code. Instead of opening a heavy IDE or writing script snippets, developer utilities provide web-based playgrounds for testing regex patterns, decoding auth tokens (JWT), formatting JSON arrays, or inspecting cron expressions.
To support a secure developer workflow, all processing is performed locally on the client-side. Your secrets, database keys, and JWT payloads are never sent over the network, keeping your credentials safe and isolated.
Why use them
What you get
Local Safe Parsing
All formatters, decoders, and regex matchers process data locally. No server requests, no leaks.
Syntax Highlighting
View clean, colored syntax representations of code arrays that enhance readability.
Time-saving Presets
Quick-access templates and examples speed up debugging and expression composition.
Summary
Key points
- QuickToolz offers 19 free developer tools, with no account or installation.
- Every tool runs in your browser, so your data stays on your device.
- There are no usage limits, watermarks or paid tiers.
- Each tool page includes step-by-step instructions and worked examples.
FAQ
Developer Tools questions
Is it safe to paste JWT tokens or JSON keys into these tools?
What is a JSON Web Token (JWT) decoder?
How does the Cron Expression Parser work?
Can I format minified JSON files?
Is there a limit on input file sizes?
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