Free Tool Guides
Step-by-step guides for everyday tasks: strong passwords, PDFs, images, JSON, regex, JWT, SPF, DKIM and DMARC, with a free tool for each one.
Guides
Base64 and URL Encoding Explained
Base64 and URL encoding explained: how each works, when to use which, how UTF-8 text is handled, and how to encode or decode values without breaking data.
Read the guideUTM BuilderHow to Build UTM Links for Campaign Tracking
Learn how to build UTM links that track campaigns in Google Analytics: what each parameter means, naming rules, a worked example and the mistakes to avoid.
Read the guideAge CalculatorHow to Calculate Age From Date of Birth
Learn how to calculate age from a date of birth in years, months and days, how to borrow days and months correctly, and how leap-day birthdays are handled.
Read the guidePercentage CalculatorHow to Calculate a Percentage (With Examples)
Learn how to calculate a percentage step by step: what percent one number is of another, a percent of a number and percent change, with worked examples.
Read the guideCompress Image to SizeHow to Compress an Image to 100 KB
Learn how to compress a photo to under 100 KB for online forms and job or exam portals, keep it sharp, and avoid unit mix-ups, using a free browser-based tool.
Read the guideHEIC to JPG ConverterHow to Convert HEIC to JPG on Any Device
Learn what HEIC files are, why some apps and upload forms reject them, and how to convert iPhone HEIC photos to JPG in your browser without uploading them.
Read the guideWebP ConverterHow to Convert Images to WebP (JPG and PNG)
Learn how to convert JPG and PNG images to WebP, what the format supports, when it saves space, and how to serve WebP on a website with a JPG fallback.
Read the guideJPG to PDF ConverterHow to Convert JPG to PDF in Your Browser
Learn how to convert JPG to PDF: combine photos or scans into one PDF, set the page order, choose A4, Letter or image size, and avoid common mistakes.
Read the guideWord CounterHow to Count Words and Characters in Text
Learn how to count words and characters in any text, why tools give different totals, and how to check length limits and reading time with a free counter.
Read the guideQR Code GeneratorHow to Create a QR Code for a URL or Text
Learn how to create a QR code for a website link or short text, choose a size that scans reliably, and test it before you print, with a free QR code generator.
Read the guidePassword GeneratorHow to Create a Strong Password
Learn how to create a strong password using length and true randomness, what NIST SP 800-63B recommends, and how to generate one safely in your browser.
Read the guideXML Sitemap GeneratorHow to Create an XML Sitemap for a Website
Learn how to create an XML sitemap step by step: the required format, which URLs to include, the 50,000 URL and 50 MB limits, and how to submit it to Google.
Read the guideJWT DecoderHow to Decode a JWT and Read Its Claims
Learn how to decode a JWT, read header and payload claims such as exp, iss and aud, and why decoding a token is never the same as verifying it.
Read the guideJSON Formatter & ValidatorHow to Format and Validate JSON
Learn how to format and validate JSON, fix the syntax errors that break parsers, and pretty-print or minify data in your browser with a free JSON formatter.
Read the guideMerge PDFHow to Merge PDF Files into One Document
Learn how to merge PDF files into one document in the order you want, what happens to pages and bookmarks, and how to avoid password and file size problems.
Read the guideImage ResizerHow to Resize an Image Without Distortion
Learn how to resize an image to exact pixel dimensions, keep the aspect ratio, avoid stretching and blur, and know which file format you get back.
Read the guideSplit PDFHow to Split a PDF: Extract or Remove Pages
Learn how to split a PDF: extract the pages you need, remove blank or private pages, reorder them, or save every page as its own PDF, with page range examples.
Read the guideRegex TesterRegex Basics: Patterns, Flags and Testing
Learn regex basics with clear examples: character classes, quantifiers, anchors, groups and JavaScript flags, plus how to test a pattern before you use it.
Read the guideRobots.txt GeneratorRobots.txt Guide: Syntax, Rules and Examples
A practical robots.txt guide: where the file lives, how User-agent, Allow and Disallow rules match, why it controls crawling not indexing, with examples.
Read the guideDMARC CheckerSPF, DKIM and DMARC Setup Guide
Set up SPF, DKIM and DMARC step by step: the DNS records to publish, how alignment works, a safe path to p=reject, and how to check your DMARC record.
Read the guideEvery guide pairs with a free tool on irfanaslam.io.