Generators: Passwords, QR Codes & Developer Tools

Generators & developer tools

Create, transform and validate everyday data in your browser.

Browse 31 tools for random choices, identifiers, text cleanup, SEO markup and front-end checks. Use the individual tool’s options and review generated output before applying it to a live website.

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Showing 31 of 31 tools

Featured tools

8 tools

Open commonly used generators, encoders and data checks.

Password GeneratorCreate passwords with the options supported by the tool. Random Number GeneratorDraw numbers from a selected range. UUID GeneratorGenerate version 4 identifiers for testing and data. Base64 Encoder DecoderEncode or decode text using Base64. JSON FormatterFormat and inspect JSON text. URL Encoder DecoderEncode or decode URL text. QR Code GeneratorCreate a QR code from text or a link. Schema ValidatorCheck structured data syntax and reported issues.

Random choices & planning

9 tools

Make selections, generate values and organize a small task list.

Coin Flip GeneratorFlip a virtual coin. Dice RollerRoll virtual dice for games and practice. PIN GeneratorGenerate numeric PINs with chosen settings. Random Color GeneratorDiscover color values for a project. Random Date GeneratorGenerate dates within a selected range. Random Name PickerPick a name from an entered list. Team GeneratorDivide names into teams. Username GeneratorExplore possible usernames. To-Do List GeneratorOrganize a list of tasks in the browser.

Text & data transformation

8 tools

Clean, transform and extract information from text.

Case ConverterChange capitalization across text. HTML to MarkdownConvert HTML markup into Markdown text. Lorem Ipsum GeneratorGenerate placeholder copy for layouts. List FormatterFormat line-based entries for data or code. Remove Duplicate LinesClean repeated lines from text or URLs. Sort Lines OnlineSort lines of text or numbers. URL Extractor OnlineExtract links from supplied text or HTML. HTML MinifierReduce whitespace and formatting in HTML input.

SEO & validation

4 tools

Draft and inspect metadata, sitemaps, robots directives and performance signals.

XML Sitemap ValidatorInspect an XML sitemap for structural issues. Meta Tag GeneratorPrepare metadata markup for a page. Robots.txt GeneratorDraft a robots.txt file from selected directives. Web Performance HTML AuditorReview HTML for potential loading and layout issues.

Developer utilities

2 tools

Prepare resource hints and responsive image markup for a page.

Resource Hints & Preload GeneratorPrepare resource hint and preload markup for assets. Responsive Image HTML OptimizerReview responsive image markup and loading attributes.

Choose the right output

A simple workflow for generated data

Select the task

Choose whether you need a random value, a text transformation, an encoded string or website markup.

Check the options

Set the range, count, format or document input required by the individual tool. Do not paste secrets into a tool unless you have checked how it handles data.

Validate the result

Preview or test output in its intended environment. A generated robots rule, preload tag or schema example needs to match the page where it will be used.

From draft markup to a page check

Start with the Meta Tag Generator or Robots.txt Generator when preparing page settings. Then use the Schema Validator to inspect structured data and the Web Performance HTML Auditor for potential HTML loading or layout issues. These are checks and drafts; verify the published page with the relevant search and browser tools.

Frequently asked questions

Practical limits for generators, encoders and website checks.

What is the difference between encoding and encryption?

Encoding changes a representation so it can be transported or interpreted. Base64 and URL encoding do not hide secrets or provide encryption.

Can a generated UUID be used as a password?

A UUID is an identifier format. Use the Password Generator with suitable settings for passwords rather than treating any identifier as a password.

Does a robots.txt file guarantee that a page stays out of Google?

No. Robots directives control crawling, and blocked URLs can still be discovered. Use an appropriate indexing directive on a crawlable page when exclusion from search is the goal.

Does valid schema guarantee a rich result?

No. Correct syntax is only part of eligibility. The page content and the search engine’s feature rules also matter.

Should I preload every image and font?

No. Preload only resources critical to the page’s initial rendering after measuring the effect; too many early requests compete for bandwidth.

Can a page auditor replace PageSpeed Insights?

No. An HTML inspection can flag potential markup issues, while live page measurements include network, rendering and device behavior.

Continue with a connected task.

Document ToolsPDF and Markdown utilities NetworkingIP, subnets and connections ConvertersUnits and data formats MathNumbers and formulas