Free Online Converters

Unit converter, Unix timestamp and time zone converters — 12 free converters.

12 free converters — no sign-up needed
12 tools in
this category

Unit Converter

Length, weight, temperature, data, time, area, volume and speed.

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Unix Timestamp Converter

Timestamps to dates and back, in local time and UTC.

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Roman Numeral Converter

Numbers to Roman numerals and back, from 1 to 3999.

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Text, Binary and Hex Converter

Convert plain text to binary or hexadecimal bytes (UTF-8), and back again.

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Number to Words Converter

Spell out a number in English words, including decimals and negatives.

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Time Zone Converter

Convert a date and time between time zones, and see the current time around the world.

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Shoe Size Converter

Convert shoe sizes between US, UK, EU and foot length in centimetres.

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Aspect Ratio Calculator

Simplify a width and height into a ratio, or find a missing dimension.

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ASCII Converter

Convert text to ASCII character codes, and decode ASCII codes back to text.

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Unicode Converter

Convert text to Unicode escape sequences, and decode them back to text.

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CSS Unit Converter

Convert between px, rem, em, pt and other CSS length units using a base font size.

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Words to Number Converter

Parse spelled-out English numbers like "two thousand and fifty" back into digits.

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Explore other categories

Text Tools

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About

About Converters

Toolapt's 12 free online converters switch values between formats instantly. Convert length, weight, temperature, data size, time, area, volume and speed with the Unit Converter. Convert Unix timestamps to readable dates, compare time zones, spell numbers out in words (or turn words back into numbers), convert to Roman numerals, binary, hex, ASCII and Unicode, and work with CSS units, aspect ratios and shoe sizes. Results update as you type — no account and no limit.

A few to try

FAQ

Frequently asked questions

Quick answers to the questions people ask most.

What units can the Unit Converter handle?

It converts length, weight, temperature, data size, time, area, volume and speed — for example centimetres to inches, kilograms to pounds or Celsius to Fahrenheit.

Where are the HEX to RGB and colour converters?

They're in Designer Tools, together with the Colour Contrast Checker, Color Picker, colour palette and CSS gradient generators.

How do I convert a Unix timestamp to a date?

Paste the timestamp into the Unix Timestamp Converter. It shows the date and time in both your local time zone and UTC, and converts a date back into a timestamp too.

How do I convert time between time zones?

Use the Time Zone Converter: pick a date, time and starting zone, and see the same moment in other time zones — plus the current time around the world.

How do I write a number in words?

Type the number into the Number to Words Converter and it spells it out in English, including decimals and negative numbers. Words to Number Converter does the opposite.

Can I convert numbers to Roman numerals?

Yes — the Roman Numeral Converter turns numbers from 1 to 3999 into Roman numerals and converts Roman numerals back into numbers.

Are these converters free? Do I need to sign up?

All 12 converters are completely free, with no account and no limit on how often you use them. They work in any modern browser on phone, tablet and desktop.

Is anything I enter sent to a server?

No. Every converter works in your own browser, so the values you type are converted on your device and never uploaded to Toolapt.

Still have a question? Contact us