Guides

Practical how-to pages for every Toolora catalog tool — JSON, encoding, text case, calculators, images, CSS, timers, and more — plus browsing the catalog and switching dark/light mode. Family write-ups list every sibling /tools/{slug}. English and Vietnamese share the same guide URLs under /guides and /vi/guides.

How to browse and search Toolora tools

Find any of Toolora’s browser-first utilities from the home page, category pages, or the Tools catalog search.

How to format JSON online

Learn how to pretty-print messy JSON in your browser with Toolora’s free JSON Formatter.

How to encode and decode Base64

A quick guide to Base64 encoding and decoding text safely in your browser with Toolora.

How to generate a strong password

Create a strong random password in your browser with Toolora’s Password Generator.

How to URL-encode a string

Learn when and how to percent-encode URL query values with Toolora’s URL Encode tool.

How to create a URL slug

Turn a headline into a clean, SEO-friendly slug in your browser with Toolora’s Slugify Text tool — no upload.

How to convert YAML and JSON

Convert YAML config files to JSON (and back) in your browser with Toolora’s YAML ↔ JSON Converter.

How to convert Markdown to HTML

Turn Markdown drafts into HTML markup with Toolora’s Markdown → HTML tool.

How to preview Markdown online

See a live rendered preview of Markdown as you type with Toolora’s Markdown Preview tool.

How to convert colors (HEX, RGB, HSL)

Convert color values between HEX, RGB, and HSL with Toolora’s Color Converter.

How to generate Lorem Ipsum

Create placeholder copy for mockups and wireframes with Toolora’s Lorem Ipsum Generator.

How to format SQL online

Pretty-print messy SQL queries in your browser with Toolora’s free SQL Formatter.

How to format XML online

Indent and validate XML in your browser with Toolora’s XML Formatter.

How to convert JSON to TypeScript interfaces

Paste a JSON object or array and generate TypeScript interfaces in your browser.

How to generate a QR code online

Create a QR code from a URL or text in your browser with Toolora. Nothing is uploaded.

How to generate a barcode online

Create a Code 128, EAN, UPC, or other 1D barcode in your browser with Toolora. Nothing is uploaded.

How to convert an image to Base64

Turn an image into a Base64 data URI (or preview Base64 as an image) locally in Toolora.

How to create a signed JWT online

Build an HS256/HS384/HS512 JWT from a JSON payload and secret in your browser.

How to hash a password with bcrypt

Generate or verify a bcrypt password hash locally in your browser with Toolora.

How to convert XML and JSON

Convert XML documents to JSON, or JSON objects to XML, locally in your browser with Toolora.

How to generate an HMAC signature

Create HMAC-SHA-256 (or SHA-384/SHA-512) signatures in your browser for webhooks and APIs.

How to encode and decode hexadecimal

Convert UTF-8 text to hex bytes, or hex back to text, with Toolora’s Hex Encode / Decode tool.

How to parse a URL and query string

Split a URL into host, path, hash, and query parameters in your browser with Toolora’s URL Parser.

How to generate dummy JSON data

Create sample users, products, or API JSON for mocks and UI prototypes in your browser.

How to build a cron expression

Compose a 5-field cron schedule (minute, hour, day, month, weekday) and see it explained in English.

How to convert text case online

Change text to lowercase, Title Case, camelCase, CONSTANT_CASE, and other styles in your browser — without uploading.

How to switch between dark and light mode

Change Toolora’s appearance with Light and Dark themes, and keep your preference saved in the browser.

How to count calendar days, working days, and age

Worked examples for Toolora’s Age, Date, Days Between, and Working Days calculators — civil dates in the browser, not elapsed hours.

How to compare a loan payment with compound interest

When to amortize a debt versus projecting a deposit, with the formulas Toolora uses in the browser.

How to calculate adult BMI in metric or imperial units

Formulas, WHO-style bands, and limits of BMI as a screening ratio — computed locally on Toolora.

How to calculate a credit-weighted 4.0 GPA

Letter maps, quality points, and what Toolora’s GPA Calculator does not apply from a registrar’s rules.

How to split a restaurant tip and read profit margin vs markup

Tip on the bill you mean, then stop mixing margin with markup when you price a product.

How to convert a wall clock between IANA time zones

Treat 3 p.m. as civil time in a named zone, convert through UTC, and format in the destination — including DST on that date.

How to decode a JWT and sign one locally

Read header and payload in the browser, then mint HS256 tokens without uploading secrets — and why decode is not verify.

How to find and replace, test a regex, and diff two texts

Choose literal replace, a JavaScript regular expression, or a line-oriented diff — all in the browser, with worked examples.

How to validate, minify, and compare JSON

Check syntax, strip whitespace, or diff two documents in the browser — without treating minify as a validator or a tree diff as a text diff.

How to count, sort, reverse, and clean text

Word and character counts, unique lines, collapsed spaces, sort order, line numbers, and reverse — each is a different transform in the browser.

How to pick random names, numbers, and dice rolls

Web Crypto integers in a range, names from your list or a sample pool, and tabletop dice — all local, with replacement, not a lottery certificate.

How to measure typing speed in the browser

Words per minute and accuracy against a sample paragraph — keystrokes stay on this device, and the clock is not a certification exam.

How to estimate password strength locally

Length and character-set checks in the browser — a heuristic, not a breach database, and not a substitute for a password manager.

How to generate UUID v4, UUID v7, and ULID

Local identifiers in the browser: random v4, time-sortable v7, and ULID — not a primary-key consultant and not a password.

How to hash text with SHA-256 (and other SHA-2)

Browser SubtleCrypto digests for checksums — not encryption, not bcrypt, and not HMAC unless you add a key on the HMAC page.

How to convert Unix timestamps and ISO dates

Seconds versus milliseconds, UTC ISO, and local display — in the browser, without treating a wall-clock zone converter as an epoch parser.

How to read a five-field cron expression in English

Paste minute hour day month weekday and get a plain-language summary — the reverse of Cron Builder, still UNIX-style, still local.

How to convert CSV to JSON and JSON to CSV

Header rows become object keys, and arrays of objects become tables — locally, with quoted commas preserved on the way in.

How to convert binary, octal, decimal, and hex

Integer base conversion in the browser with parseInt — not IEEE floats, not two’s-complement tutorials, and not hex encoding of text.

How to pretty-print or minify HTML, CSS, and JavaScript

Local indent or compress for markup, styles, and scripts — a formatter, not a bundler, linter, or Prettier plugin host.

How to encode and decode HTML entities

Turn <, &, and quotes into entities (or back) so example markup can sit in HTML text — not a sanitizer and not a formatter.

How to compress, resize, convert, and crop images locally

JPEG/PNG/WebP quality, pixel dimensions, format conversion, and a crop rectangle — files never leave this browser tab.

How to calculate percentages, discounts, units, and currency

Percent-of math, sale prices, SI-style unit conversion, live FX, and a scientific keypad — pick the formula that matches the story.

How to pick colors and generate CSS gradients, shadows, and borders

Copy HEX/RGB/HSL, linear-gradient, box-shadow, and border CSS from live previews — design tokens in the browser, not a full IDE.

How to use a stopwatch, laps, countdown, and Pomodoro in the browser

Elapsed time, split lists, countdowns, and 25-minute focus cycles — local clocks in this tab, not a calendar or a cron job.