Back Generation & Formatting

Generation & Formatting Tools

Generate and format data instantly with these free browser-based tools built for developers and designers. Create universally unique identifiers, pretty-print or minify JSON with real-time validation, produce placeholder text for mockups, generate cryptographically secure passwords, build QR codes for URLs and WiFi credentials, explore color palettes with WCAG contrast checking, and craft SEO-friendly URL slugs from any title — all running entirely client-side with zero server calls and no signup required.

15 Generation & Formatting Tools

uid

UUID Generator

Generate v4 UUIDs instantly. Bulk generate, copy all with one click.

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JSON Formatter & Validator

Pretty print, minify and validate JSON with instant error detection.

Popular

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences or words for mockups.

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Password Generator

Generate cryptographically secure random passwords with customizable options.

QR Code Generator

Create QR codes for URLs, WiFi, email and phone. Download PNG, no watermark.

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Color Palette Generator

Generate color palettes with harmony modes. WCAG contrast checker built in.

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URL Slug Generator

Create SEO-friendly URL slugs from titles. Transliterate accents, custom separators.

SQL

SQL Formatter & Beautifier

Format, beautify and minify SQL queries.

Popular

XML

XML Formatter & Validator

Format, validate and beautify XML documents.

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CSS Gradient Generator

Create CSS gradients with a visual editor.

SEO

Meta Tag Generator

Generate SEO meta tags and Open Graph markup.

OG Preview Tool

Preview how your page looks on social media.

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CSS Box Shadow Generator

Build multi-layer box-shadows with visual sliders.

New

WCAG Contrast Checker

Check AA/AAA contrast ratios with live pass/fail.

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Color Name from Hex

Find the nearest CSS named color for any hex value.

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Which generation tool should you use?

Generation tools cover everything from formatting JSON to producing UUIDs, QR codes, secure passwords, and CSS gradients. The right tool depends on whether you're debugging an API response, seeding test data, building a UI, or generating an asset for production. Use this guide to map the task to the right output.

Pretty-print or validate a JSON response from an API — use JSON Formatter & Validator.
Format a SQL query for review or pull-request (MySQL, Postgres, SQL Server) — use SQL Formatter.
Generate test UUIDs for database seeds or feature flags — use UUID Generator.
Generate a strong password for a service account or user setup — use Password Generator. Always 16+ chars.
Make a QR code for a URL, WiFi credentials, or contact card — use QR Code Generator.
Build a CSS gradient visually with linear, radial, or conic stops — use CSS Gradient Generator.
Generate a CSS box-shadow with multi-layer presets (material, neon, soft) — use CSS Box Shadow Generator.
Pick or generate a color palette with WCAG contrast checks — use Color Palette Generator.
Check accessibility contrast (WCAG AA/AAA) for a text/background pair — use WCAG Contrast Checker.
Find the nearest CSS named color for a hex code — use Color Name from Hex.
Format/validate XML (SOAP, RSS, Atom feeds) — use XML Formatter.
Create SEO-friendly URL slugs from titles or strings — use URL Slug Generator.
Generate Open Graph & meta tags for SEO — use Meta Tag Generator.
Preview how a link looks on Twitter, LinkedIn, Facebook — use Open Graph Preview.
Generate placeholder text for mockups (lorem ipsum, words, paragraphs) — use Lorem Ipsum Generator.
Look up an HTTP status code meaning, when to return it, common confusions — use HTTP Status Codes Reference.

Common generation mistakes to avoid

Using UUIDv4 for sortable IDs. v4 is random — terrible for B-tree index locality. For new tables, use UUIDv7 (time-ordered) or a ULID.
Generating "strong" passwords with predictable patterns. A 16-char password from [a-z]+digit is far weaker than full alphanumeric+symbols. Always include all four classes.
Embedding QR codes as PNGs everywhere. SVG QR codes scale to any size and are tiny. PNG only when the rendering platform forces it.
Returning 200 OK with an error in the body. Use the right HTTP status — 4xx for client errors, 5xx for server errors. Monitoring tools rely on it.
Skipping WCAG contrast checks. Many "good-looking" color combos fail AA (4.5:1 for body text). Verify before shipping — accessibility is now a legal requirement in many jurisdictions.
Hand-crafting OG meta tags. Easy to miss og:image:width/height, leading to broken Twitter cards. Use a generator and preview before deploying.

Frequently Asked Questions

A UUID (Universally Unique Identifier) is a 128-bit value used to identify resources without a central authority. Version 4 UUIDs are generated randomly and have an astronomically low collision probability, making them ideal for database primary keys, distributed systems, session tokens, and anywhere you need a unique ID without coordinating across servers. They follow the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx and are widely supported in every programming language and database.

Raw JSON from APIs or logs is often minified into a single line, making it nearly impossible to read and debug. A JSON formatter pretty-prints the data with proper indentation so you can quickly inspect nested structures, spot missing commas or brackets, and understand the data shape. Validation catches syntax errors like trailing commas, unquoted keys, or mismatched brackets before they cause runtime failures in your application. Formatting and validating JSON early saves significant debugging time downstream.

QR (Quick Response) codes encode data into a two-dimensional grid of black and white modules that can be scanned by any smartphone camera. They support several data types including plain URLs, WiFi network credentials, email addresses, phone numbers, and plain text. A standard QR code can store up to about 3,000 alphanumeric characters. They include built-in error correction so they remain scannable even when partially damaged or obscured, making them reliable for print media, product packaging, and digital sharing.

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