Guides
Practical explainers for Utiliio tools — JSON, JWT, encoding, cron, and more. Every example links to a free browser-based tool with no upload.
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Most popular guides for developers debugging APIs, auth, and data formats.
JWT Decoder Online (Free, Private)
Decode, verify, and inspect JSON Web Tokens online — HS256/RS256 support, expiry badges, and claims table. Nothing uploaded.
Read guideJSON Formatter Online Free — Pretty Print & Validate JSON
Pretty-print, minify, and validate JSON online with live output, error locations, and structure preview. Free, private, no upload.
Read guideBase64 Encoder Online Free — Encode & Decode in Browser
Encode text to Base64 or decode Base64 strings online — standard and URL-safe modes, live round-trip, no upload.
Read guideURL Encode, Decode & Parse Online (Free, Private)
Encode and decode URL strings, parse query parameters, and inspect URL components — all on one page, nothing uploaded.
Read guideCron Expression Generator Online (Free)
Build and validate cron schedules visually with next-run preview. Free online cron workbench — parse, build, and test in your browser.
Read guideWorkbench guides
Deep dives on unified workbenches — multiple tabs, live output, and shareable state on one page.
SHA-256 Hash Generator Online Free — Hash & HMAC Workbench
Generate SHA-256, SHA-384, and SHA-512 hashes online with live output. HMAC tab for webhook signatures — free, private, Web Crypto API.
Read guideMarkdown Preview Online (Free, Private)
Preview Markdown with live rendered HTML — convert to HTML or reverse from HTML on the same workbench.
Read guideCSV to JSON Converter Online Free — Parse Spreadsheets to JSON
Convert CSV to JSON arrays online with live row counts, header detection, and JSON → CSV round-trip. Free, private, no upload.
Read guideHex Encoder & Decoder Online (Free, Private)
Convert text to hex and back with round-trip — encode/decode tabs on one page, live output.
Read guideBinary Converter Online (Free, Private)
Convert text to binary and back with byte/bit counts — encode/decode tabs with round-trip on one page.
Read guideWeb Formatter Online (Free) — HTML, CSS, JS & XML
Beautify HTML, minify CSS/JS, and format XML on one workbench — live output with bytes saved.
Read guideHigh-traffic tool guides
Guides matched to popular search queries — JSON, CSV, encoding, UUID, and JWT.
JSON to CSV Converter Online Free — Export Arrays to Spreadsheet
Convert JSON arrays to CSV online with live row counts, headers from keys, and CSV → JSON round-trip. Free, private, no upload.
Read guideJSON Formatter Online Free — Pretty Print & Validate JSON
Pretty-print, minify, and validate JSON online with live output, error locations, and structure preview. Free, private, no upload.
Read guideASCII Decoder Online Free — Convert Codes to Text
Decode ASCII and Unicode character codes to readable text. Decimal or hex input, live output — free, private, no upload.
Read guideHTML Encoder Online Free — Escape & Encode HTML Entities
Encode and decode HTML entities online instantly. Escape special characters for safe display — free, private, runs in your browser.
Read guideUUID Generator Online Free — Generate UUID v4 Instantly
Generate cryptographically random UUID v4 identifiers online. Free, private, bulk copy — runs in your browser, no upload.
Read guideJWT Decoder Online (Free, Private)
Decode, verify, and inspect JSON Web Tokens online — HS256/RS256 support, expiry badges, and claims table. Nothing uploaded.
Read guideAll guides
JWT Verify Online (Free, Private) — HS256 & RS256
Verify JWT signatures online with HMAC secrets or RSA public keys. Free browser-based verification — no token upload.
Read guideURL Parser Online (Free) — Query Params & Components
Parse any URL into protocol, host, path, hash, and query parameters. Free browser-based URL parser with decoded values.
Read guideHTML Beautifier Online (Free, Private)
Beautify HTML with indentation in the Web Formatter workbench — CSS/JS minify and XML format on one page.
Read guideLorem Ipsum Generator Online (Free)
Generate placeholder Lorem Ipsum text for mockups and prototypes. Free, instant, runs in your browser.
Read guideColor Converter: Hex to RGB Online (Free)
Convert colors between HEX, RGB, and HSL online. Free color converter — instant results in your browser.
Read guideHow to Share Utiliio Tool Links With Preserved Input
Share JSON, JWT, regex patterns, workbench state, and more via URL — input is encoded in the link and restored when opened. Nothing stored on our servers.
Read guideCSS Minifier Online (Free, Private)
Minify CSS by removing whitespace and comments online. Free browser-based minifier — your stylesheets never uploaded.
Read guideEMI Calculator for Home Loan Online (Free)
Calculate monthly EMI for home, car, and personal loans. Free online calculator — runs locally, no data shared.
Read guideJWT Generator Online (Free, Private)
Create and sign JSON Web Tokens locally in your browser. HS256 signing with custom claims — secrets never uploaded.
Read guideCompound Interest Calculator Online (Free)
Calculate compound interest and future value for savings and investments. Free, private, browser-based calculator.
Read guideXML Formatter & Pretty Print Online (Free)
Format XML with indentation in the Web Formatter workbench — HTML, CSS, JS, and XML on one page.
Read guideMeta Tag Generator for SEO Online (Free)
Generate title, description, Open Graph, and Twitter Card meta tags for your website. Free, private, browser-based.
Read guidePassword Strength Checker Online (Free, Private)
Check password strength with a visual score and feedback. Runs locally — your password never leaves your browser.
Read guideVAT Calculator Online (Free, Private)
Calculate Value Added Tax for invoices and receipts. Free browser-based VAT calculator — no data uploaded.
Read guideCIDR Calculator & Subnet Mask Online (Free)
Calculate subnet ranges, network addresses, and host counts from CIDR notation. Free, browser-based networking tool.
Read guideTimezone Converter Online (Free)
Convert date and time between world timezones instantly. Free browser-based tool — no upload required.
Read guideGST Calculator Online Free (India)
Calculate GST inclusive and exclusive amounts for invoicing. Free online calculator — runs locally in your browser.
Read guideSQL Formatter & Pretty Print Online (Free, Private)
Format and beautify SQL queries online for free. Runs in your browser — no upload, no sign-up.
Read guideQR Code Generator Online — No Upload Required
Create QR codes for URLs, WiFi, and text in your browser. Free, instant, nothing sent to a server.
Read guideText Diff Compare Online (Free, Private)
Compare two texts side-by-side and highlight differences. Free online diff tool — runs locally, no upload.
Read guideMarkdown to HTML Converter Online (Free)
Convert Markdown to HTML with live preview — same workbench includes HTML → Markdown round-trip.
Read guideUnix Timestamp Converter Online (Free)
Convert Unix timestamps with relative time ("3 days ago"), local/ISO/UTC formats — live in your browser.
Read guideRegex Tester Online (JavaScript, Free)
Test regular expressions online with live match highlighting. Free JavaScript regex tester — runs locally, no upload.
Read guideStrong Password Generator Online (Free, Private)
Generate secure random passwords locally in your browser. Free, instant, and never uploaded to a server.
Read guideQR Code Generator Online — No Upload Required
Create QR codes for URLs, WiFi, and text in your browser. Free, instant download — nothing uploaded to a server.
Read guideHMAC SHA-256 Generator Online (Free, Private)
Generate HMAC-SHA256 signatures in the Hash/HMAC workbench. SHA-384 and SHA-512 included — secrets never uploaded.
Read guideYAML to JSON Converter Online (Free)
Convert YAML to JSON instantly in your browser. Free, private, and no upload — ideal for Kubernetes, Docker Compose, and CI configs.
Read guideChmod Calculator: Convert 755 to Symbolic (rwxr-xr-x)
Convert chmod octal values like 755 to symbolic notation (rwxr-xr-x) and back. Free online calculator — runs locally, no upload.
Read guideLevenshtein Distance Calculator Online
Calculate edit distance and string similarity between two texts. Free online tool — private, browser-based, no upload required.
Read guideHow to Create Markdown Tables
Syntax and tips for building tables in Markdown for GitHub, docs, and blogs.
Read guideProfit Margin vs Markup: What Is the Difference?
Learn how margin and markup differ and which to use when pricing products.
Read guideUUID Versions Explained (v1–v7)
Understand the different UUID versions and when each is used.
Read guideEssential Meta Tags for SEO and Social Sharing
Which meta tags every webpage needs for search engines and social previews.
Read guideCSS Linear Gradients Explained
How linear gradients work in CSS and when to use them.
Read guideString Similarity and Edit Distance
How Levenshtein distance powers spell checkers, search, and fuzzy matching.
Read guideASCII and Character Encoding Basics
How ASCII codes work — decimal, hex, encode/decode text, and when to use an ASCII decoder online.
Read guideHow to Build Cron Expressions
Step-by-step guide to creating cron schedules for jobs and automation — with visual builder and next-run preview.
Read guideVAT vs GST: What Is the Difference?
Compare Value Added Tax and Goods and Services Tax for invoicing.
Read guideUnix File Permissions (chmod) Explained
Understand octal and symbolic notation for Unix file permissions.
Read guideMarkdown ↔ HTML: When to Convert Each Way
Convert Markdown to HTML with live preview, export source, or reverse HTML to Markdown — one workbench.
Read guideJavaScript Minification: What Gets Removed?
How JS minifiers reduce file size — use the Web Formatter workbench for HTML, CSS, JS, and XML.
Read guideIPv4 Address Formats Explained
Learn dotted decimal, integer, and hex representations — with live conversion in Utiliio's IP workbench.
Read guideWhy Reading Time Matters for SEO and UX
How estimated reading time improves engagement, bounce rate, and content UX.
Read guideHMAC vs Hash: What Is the Difference?
Understand when to use a plain hash versus HMAC — and how Utiliio's Hash/HMAC workbench covers both.
Read guideJSON vs XML: When to Use Each Format
Compare JSON and XML data formats — strengths, weaknesses, and real-world use cases.
Read guideCSS Hex Colors Guide for Developers
How hex color codes work in CSS and how to convert between HEX, RGB, and HSL.
Read guideEMI vs SIP: Which Calculator Do You Need?
Understand the difference between EMI loans and SIP investments, and when to use each calculator.
Read guidePassword Security Best Practices
How to create, store, and manage strong passwords that protect your accounts.
Read guideHTTP Status Codes Explained
Complete guide to HTTP status codes — what 200, 404, 500 mean and when to use each.
Read guideCSV vs JSON: When to Use Each Format
Understand the differences between CSV and JSON data formats and when to convert between them.
Read guideSEO URL Slugs: Best Practices
How to create SEO-friendly URL slugs that rank better and improve user experience.
Read guideCron Scheduling Guide
Master cron expressions for Linux crontab, Kubernetes, GitHub Actions, and CI pipelines — with live next-run preview.
Read guideSQL Formatting Best Practices
Why SQL formatting matters and how to write readable, maintainable database queries.
Read guideMarkdown Syntax Guide for Developers
Learn Markdown formatting — headings, links, lists, code blocks, and how to convert Markdown to HTML.
Read guideHTML Encoding Explained — Developer Guide
Learn why HTML encoding matters, which characters to escape, and when encoding prevents XSS — with a link to the free browser encoder.
Read guideRegular Expressions (Regex) Basics
A beginner-friendly guide to regular expressions — patterns, flags, and common use cases.
Read guideUnix Timestamp Guide
Understand Unix epoch timestamps — conversion, relative time, and seconds vs milliseconds.
Read guideSHA-256 Hash Explained
Learn what SHA-256 hashing is, how it works, and when to use cryptographic hash functions.
Read guideWhat Is a JWT (JSON Web Token)?
Understand JSON Web Tokens — structure, decode, verify, and sign — with Utiliio's free browser-based JWT workbench.
Read guideHow to Format JSON Online
Step-by-step guide to formatting, validating, and minifying JSON with live output, error locations, and structure preview.
Read guideWhat Is Base64 Encoding?
Learn what Base64 encoding is, why developers use it, and how to encode or decode Base64 strings online — including URL-safe mode.
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