Useful tools

Converts text between uppercase, lowercase and more

Counts characters, words and sentences

Two-way translation with sound, light and vibration, a telegraph key and a trainer

Guillemets, dashes and non-breaking spaces, every edit highlighted

Six cases, the way back to the nominative, job titles and lists

«ghbdtn» becomes «привет»: text typed in the wrong layout

Converts Russian text to Latin script

Column to line, duplicates, sorting, wrapping and comparing two lists

Differences between two texts: lines, words, characters, even invisible ones

Unix permissions: checkboxes, 755, rwxr-xr-x and an ls -l line

What 404, 500 and 403 mean, who is at fault and what to do

Strip utm, fbclid and gclid, inspect domain, path and parameters

Formats and minifies JSON

Encodes and decodes URL strings, including strict RFC 3986 and HTML form encoding

Encodes and decodes Base64

Generates MD5 hash from a string

Decodes JWT header and payload, verifies signature

Live match highlighting and explanation of each token

Live preview, clean code and a standalone file — parsed in your browser

Finds hardcoded strings and future overflow before translation is ordered

Converts between HEX, RGB and HSL. Live color preview

Builds harmonious color schemes from a single color

Text and background contrast per WCAG: levels AA and AAA, and how to fix a colour

Linear, radial and conic gradients with OKLCH blending, a text readability check and export to CSS, Tailwind, SVG and PNG

Converts numbers between binary, octal, decimal and hexadecimal

Bitwise AND/OR/XOR/NOT, shifts and an IEEE 754 float32 breakdown

Arabic to Roman numerals and back. Step-by-step breakdown, reference table

Convert to HEX and back, byte breakdown and hex colours

Convert to octal and a chmod permissions calculator

Area, perimeter, volume and surface of 19 shapes — with the formula, substitution and a diagram

Bits, bytes, kilobytes, megabytes, gigabytes and terabytes

Millimetres, centimetres, metres, kilometres, miles, inches, feet

Grams, kilograms, tonnes, pounds, ounces, pud

Celsius, Fahrenheit, Kelvin and historical scales — all at once

Converts Unix time to a readable date and back. 1741434000 → 8 March 2026

Converts time between UTC and any timezone in the world

Converts between formats: DD.MM.YYYY, ISO 8601, RFC 2822 and others

Exact age, birth weekday, zodiac signs and days lived

Countdown with sound, laps, Pomodoro and interval training

A countdown to New Year, Easter, school holidays, exams or your own date

Add intervals as a list, shifts with breaks, decimal hours and timecodes

Working days, public holidays and hours norms for 2026–2027, each with its formula

Counts days, weeks, months or years between two dates

Creates strong random passwords with charset settings and entropy

UUID v4, v7, v1, NanoID and ULID; check and decode any UUID

Placeholder text and filler: Latin, Cyrillic, HTML, Markdown, JSON

A number, a winner, teams, an order, dice and a coin

EAN-13, Code 128 and four more formats, code check and GS1 prefix

Links, Wi-Fi, contacts, GOST and crypto payments — with a scannability check

Fake people from six countries and companies: name, address, IDs, JSON / CSV / SQL

Network address, broadcast, mask, wildcard, subnet splitting

Version, private or public, mask, range and representations of an address

A number spelled out in Russian for invoices and contracts: kopecks, 15 currencies

Checksum for INN, KPP, SNILS and OGRN plus decoding: region, tax office, year

Percentage of a number, discounts and markups, Russian VAT at the 2026 rate

Payment, interest and schedule for a loan or mortgage with early repayment

Russian income tax month by month, with take-home pay

Shows the location, date and camera hidden in a photo and strips them without re-encoding

Five files instead of thirty: ico, an SVG with dark mode, an iOS icon and a manifest

SHA-256, SHA-1, SHA-512 and MD5 with reference comparison — the file never leaves the browser

Merge, split, rotate, number pages, JPG to PDF and back — files are never uploaded to a server

Several files into one, in the order you choose

Pull out the pages you need or cut the document into parts

Photos and scans into one PDF, on A4 or sized to the picture

Pages as pictures at the resolution you need, in a ZIP

By 90° or 180° — the whole document or chosen pages

Mark the extra pages and keep the rest

Rearrange pages by dragging thumbnails

Numbers at the bottom or top, from the page you choose