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Paste your chapters, get them checked against YouTube's official rules, auto-fixed, and formatted for pasting straight into your description.
Upload a thumbnail and check its format, size, and 16:9 aspect ratio against YouTube's official requirements before you upload it.
Check your title's length against YouTube's 100-character limit, plus readability and search/mobile display guidance.
Instant word, character, sentence and paragraph counts, reading time, text insights, and length references for X/Twitter, SMS, and more.
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and CONSTANT_CASE — all at once.
Paste a list to instantly drop repeated lines, keeping the first occurrence of each and preserving order — with case-sensitive and whitespace-trimming comparison options.
Paste a list to sort it instantly — alphabetically or numerically (natural sort), ascending or descending, case-sensitive or not.
Compare two texts and see exactly what changed — additions, removals, and word-level detail within changed lines.
Generate strong, random passwords with your browser's cryptographically secure random number generator, with a real entropy-based strength rating.
Validate JSON against the RFC 8259 spec with exact line/column error reporting, then pretty-print or minify it — with warnings for duplicate keys and unsafe-precision numbers.
Encode or decode a URL component (RFC 3986, spaces as %20) or a form value (application/x-www-form-urlencoded, spaces as +) — type in either box and the other updates instantly.
Encode or decode Base64 text — Standard (RFC 4648, + / with = padding) or URL-safe (- _, no padding, the variant used in JWTs) — type in either box and the other updates instantly.
Generate random Version 4 UUIDs (RFC 4122) using your browser's built-in crypto.randomUUID() — bulk-generate, with optional uppercase and no-hyphens formatting.
Instantly compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text using your browser's built-in crypto.subtle. MD5 isn't offered — it's not part of the Web Crypto API.
Type a title to get a clean, URL-safe slug instantly — lowercased, accents stripped (café → cafe), punctuation collapsed into a hyphen or underscore.
Paste Markdown to see it rendered live and get the HTML source to copy — CommonMark + GFM tables/strikethrough, raw HTML always shown as text, never executed.
Paste HTML to get clean Markdown instantly — headings, links, lists, code, blockquotes, GFM tables and strikethrough. Script and style content is always dropped.
Convert between JSON and YAML instantly, in either direction — type in either box and the other updates. Reuses the JSON Formatter validator for accurate line/column error messages.
Type or paste a URL or any text to get a QR code instantly, ready to download.
Upload any image to instantly see its exact width, height, aspect ratio, format, file size, and megapixel count.
Find a percentage of a number, what percent one number is of another, percent increase/decrease, or the original number before a percentage was applied.
Decode a JSON Web Token’s header and payload. This tool never verifies the signature — decoding is not proof a token is valid.
Test a regular expression against your own text with live match highlighting, capture groups, and named groups.
Generate Lorem Ipsum placeholder text by paragraphs, sentences, or words.
Parse a standard 5-field cron expression into a plain-English schedule.
Check the contrast ratio between two colors against WCAG 2.2 AA and AAA thresholds for normal and large text.
Generate title, description, Open Graph, and Twitter/X Card meta tags with an approximate search and social preview.
Convert between length units instantly — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Convert between weight and mass units instantly — milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US tons.
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Convert between CSV and JSON instantly, in either direction — with proper handling of quoted fields, commas, and escaped quotes.
Convert between HEX, RGB, and HSL color formats instantly, in any direction.
Convert between a Unix timestamp and a date/time, in either direction — with clearly labeled UTC and local time.
Shrink an image's file size — pick a format and quality, and see exactly how much you saved before you download.
Resize an image to exact width and height, with the aspect ratio locked by default.
Convert an image between PNG, JPEG, and WebP, with correct handling of transparency.
Calculate your monthly payment, total payment, and total interest for a fixed-rate loan.
Estimate your monthly principal and interest payment on a home loan.
Calculate your Body Mass Index (BMI) in metric or imperial units and see the standard adult category.
Find the exact age between a date of birth and any target date, in years, months, and days.
Find the amount saved and the final price after a percentage discount.
Calculate a tip amount and total bill, and optionally split it evenly between everyone at the table.
Split a bill evenly between any number of people, with an optional tip.
Find the percent increase or decrease from a starting value to a final value.
Find the percentage difference between two values using the standard average-based formula.
A general-purpose calculator with real operator precedence, parentheses, trig, logarithms, powers, roots, and calculation history.
Generate complementary, analogous, triadic, tetradic, and monochromatic color palettes from any base color (hex, RGB, or HSL).
Convert a date and time between time zones, with daylight-saving-time handled correctly using your browser's own time zone data.
Find and replace text instantly — case-sensitive or not, first occurrence or all, with an optional regex mode that never freezes the page.
Simplify a width and height to its aspect ratio, or calculate a missing width or height from a chosen ratio — supports common presets like 16:9 and 4:3.
Combine multiple PDFs into one file, in exactly the order you arrange them.
Extract specific pages into one file, or split a PDF into several files by page range.
Rotate all pages or just the ones you choose — 90°, 180°, or 270°.
Remove specific pages from a PDF, keeping the rest in their original order.
Combine JPEG and PNG images into one PDF, one image per page, in the order you choose.
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