Free Online Converters: The Complete Unit & Format Conversion Guide

Free online converters turn one unit, format, or system into another in a fraction of a second — no formulas to memorize, no spreadsheets to build, and nothing to install. Whether you need to know how many kilometers are in a marathon, what 98.6°F is in Celsius, how big a 24 MB file really is, what today's date is in Bikram Sambat, or how to turn a JPG into a PNG, there is a dedicated tool for the job. This pillar guide maps every conversion task to the right free tool on ShreePrati, explains the units behind each one, and shows you how to pick the correct converter every time. You can jump straight in and browse every converter, or read on for the full walkthrough.

TL;DR — Key Takeaways

• Instant and accurate. Every converter updates as you type, using exact conversion factors — no rounding surprises and no waiting.
• One converter per measurement type. Length, weight, area, volume, temperature, speed, time, data, energy, pressure, and angle each have a focused tool.
• Metric and imperial, both ways. Convert meters to feet or feet to meters, kilograms to pounds or pounds back again — the direction never matters.
• Nepal-specific conversions are covered. Switch dates between Bikram Sambat and English, and convert traditional land measurements with the Ropani-Aana converter.
• Image formats convert in your browser. Turn JPG into PNG, PNG into JPG, or move to and from WEBP without uploading a thing.
• Free, private, and no sign-up. Conversions run locally in your browser, so your data never leaves your device.

Table of Contents

• What are online converters?
• Why use browser-based converters?
• Everyday unit converters
• Scientific and technical converters
• Data, time, and digital converters
• Nepal-specific converters: dates and land
• Image format converters
• Which converter should you use? A quick reference table
• Step-by-step: three common conversions
• Best practices for accurate conversions
• Related guides
• Frequently asked questions
• Conclusion

What are online converters?

Online converters are small, single-purpose web apps that each translate a value from one unit or format into another. Behind every one is a fixed relationship — 1 mile is exactly 1.609344 kilometers, 1 kilobyte is 1,024 bytes, water freezes at 0°C or 32°F — and the tool simply applies that relationship for you and shows the result instantly.

The reason converters exist as separate tools is that the world never settled on a single system. Length is measured in meters in most countries and in feet and inches in a few; recipes use cups in one place and milliliters in another; file sizes hop between kilobytes, megabytes, and gigabytes; and Nepal keeps its own calendar and its own land-measurement units alongside the international ones. A good converter removes the friction of moving between these systems so you can get an answer and move on.

On ShreePrati, the full collection lives on the converters hub, and the tools fall into a few practical groups:

1. Everyday unit converters for length, weight, area, volume, and temperature.
2. Scientific and technical converters for speed, energy, pressure, and angle.
3. Data and time converters for digital storage and units of time.
4. Nepal-specific converters for Bikram Sambat dates and traditional land measurement.
5. Image format converters that move pictures between JPG, PNG, and WEBP.

The rest of this guide walks through each group and points you to the exact tool for every task.

Why use browser-based converters?

A converter you type into a search box is fine for a one-off, but a dedicated tool has real advantages once you use it more than once.

Accuracy you can trust

Search-box conversions often round aggressively and rarely show their work. A focused converter uses the exact conversion factor and lets you see every unit at once, so you can sanity-check the result. When you convert temperature, for example, you see Celsius, Fahrenheit, and Kelvin side by side rather than a single rounded number.

Privacy by default

Every converter here runs entirely inside your browser using JavaScript. Nothing you enter — a salary you are converting between currencies of measurement, a file size, a private date — is uploaded to a server. That is faster, works offline once the page is loaded, and keeps your data on your device.

No installation, no cost, no clutter

A web converter loads in seconds and works identically on Windows, macOS, Linux, Chromebooks, and phones. There is no app to install, no subscription, and no advertising-heavy interface between you and the answer.

One tool, one job

A converter that does exactly one thing is easy to trust and fast to use. When a page converts only length, you know precisely what it will do, and you can bookmark it for the next time.

Original data point: Across the groups below, ShreePrati offers 20 live conversion tools — eleven general unit converters plus date and land converters for Nepal and six image-format converters. Mapped against a typical week of small conversions a student, cook, developer, or office worker faces, you would find a dedicated tool for nearly every one without ever opening a calculator app or a spreadsheet.

Everyday unit converters

These are the conversions most people reach for, and each works in both directions — enter a value in any field and every other unit updates instantly.

• Convert length units. Move between meters, kilometers, centimeters, millimeters, miles, yards, feet, and inches. Use it for travel distances, room dimensions, height, and anything measured with a tape.
• Convert weight and mass. Switch between kilograms, grams, tonnes, pounds, and ounces — handy for recipes, shipping, luggage limits, and gym numbers.
• Convert area units. Translate square meters, square feet, acres, and hectares. Essential for property listings, gardens, and floor plans.
• Convert volume units. Move between liters, milliliters, gallons, cups, and pints — the everyday tool for cooking, fuel, and containers.
• Convert temperature. See Celsius, Fahrenheit, and Kelvin together. Use it for weather, cooking, and fever checks without second-guessing the math.

Scientific and technical converters

When a conversion goes beyond the kitchen and the tape measure, these tools cover the units used in physics, engineering, and the workshop.

• Convert speed units. Move between kilometers per hour, miles per hour, meters per second, and knots — for driving, running pace, wind speed, and aviation.
• Convert energy units. Translate joules, kilojoules, calories, kilocalories, and kilowatt-hours — useful for nutrition labels, electricity bills, and physics homework.
• Convert pressure units. Switch between pascals, kilopascals, bars, psi, and atmospheres — for tires, weather, and industrial gauges.
• Convert angle units. Move between degrees, radians, gradians, and turns — the go-to for geometry, trigonometry, and CAD work.

Data, time, and digital converters

Two of the most-used converters deal not with the physical world but with the digital one and with the clock.

• Convert data storage units. Translate bytes, kilobytes, megabytes, gigabytes, and terabytes. This is the tool to reach for when you need to know whether a 2 GB video will fit under a 25 MB email limit, or how much space a folder really takes.
• Convert time units. Move between seconds, minutes, hours, days, weeks, and years — for scheduling, estimating durations, and converting a "90-day" period into weeks at a glance.

Nepal-specific converters

Nepal uses its own calendar and its own traditional land-measurement units, and both need reliable conversion to and from the international equivalents.

• Convert Bikram Sambat to English dates. The Bikram Sambat (BS) calendar runs roughly 56–57 years ahead of the Gregorian (AD) calendar and starts its year in mid-April. This tool converts any BS date to its exact AD equivalent — essential for reading official documents, birthdays, and deadlines.
• Convert English dates to Bikram Sambat. The reverse conversion: enter a Gregorian date and get the correct Nepali BS date, useful for filling out forms and understanding local schedules.
• Convert Nepali land measurements. Traditional Nepali land is measured in Ropani, Aana, Paisa, and Daam (in the hills) — a nested system that is easy to get wrong by hand. This converter translates cleanly between the units so property and inheritance calculations stay accurate.

If you work with dates and the Nepali calendar often, the companion PDF tools guide shows how to combine converted dates with document tasks like filling and signing forms.

Image format converters

Not every conversion is a number. Image files come in several formats, each with its own trade-offs, and moving between them is a conversion task too. All of these run in your browser with no upload.

• Convert JPG to PNG. Choose PNG when you need lossless quality or transparency — for example, a logo or a screenshot with crisp text.
• Convert PNG to JPG. Go the other way to shrink a large image for email or the web, with a background-color option for transparent areas.
• Convert JPG to WEBP and PNG to WEBP. WEBP produces much smaller files at the same visual quality — ideal for websites and faster page loads.
• Convert WEBP to JPG and WEBP to PNG. Convert modern WEBP images back to widely supported formats so they open everywhere, keeping transparency when you choose PNG.

For resizing, compressing, and other picture edits alongside format conversion, browse all image tools.

Which converter should you use?

Use this quick-reference table to jump straight to the right tool for your task.

Your goal	Use this tool	Group
Meters to feet, miles to km	Length Converter	Everyday
Kilograms to pounds	Weight Converter	Everyday
Square feet to hectares	Area Converter	Everyday
Liters to gallons or cups	Volume Converter	Everyday
Celsius to Fahrenheit	Temperature Converter	Everyday
km/h to mph or knots	Speed Converter	Technical
Joules to calories or kWh	Energy Converter	Technical
psi to bar or atm	Pressure Converter	Technical
Degrees to radians	Angle Converter	Technical
MB to GB, bytes to KB	Data Storage Converter	Digital
Hours to days or weeks	Time Converter	Digital
Nepali date to English	BS to AD Converter	Nepal
English date to Nepali	AD to BS Converter	Nepal
Ropani to Aana to Paisa	Ropani-Aana Converter	Nepal
JPG to PNG (or reverse)	JPG to PNG	Image
Shrink an image to WEBP	JPG to WEBP	Image

Step-by-step: three common conversions

1. Check whether a file fits an email limit

1. Open the data storage converter.
2. Enter your file size — say, 2 in the GB field.
3. Read the megabyte value (2 GB is 2,048 MB).
4. Compare it to your provider's limit (often 25 MB). If it is over, compress the file before sending.

2. Convert a Nepali date on an official document

1. Open the BS to AD converter.
2. Enter the Bikram Sambat year, month, and day exactly as printed.
3. Read the exact Gregorian (AD) date.
4. To go the other way for a form, use the AD to BS converter instead.

3. Prepare an image for a fast-loading website

1. Open the JPG to WEBP converter.
2. Drop in your JPG — it is processed right in your browser.
3. Download the WEBP file, which will be noticeably smaller at the same quality.
4. If you later need a universally compatible copy, convert it back with WEBP to JPG.

Best practices for accurate conversions

• Mind the direction. Every unit converter here is bidirectional, so type your known value into the correct field and read the rest — you never need to flip the tool around.
• Watch the unit prefixes. A kilobyte is 1,024 bytes, not 1,000, and a kilometer is 1,000 meters. When a result looks off by a factor of ten or a thousand, check that you picked the right prefix.
• Prefer PNG for text and lines, JPG for photos. When converting images, choose the format that matches the content: lossless PNG for screenshots and logos, compressed JPG or WEBP for photographs.
• Double-check dates around the new year. The Bikram Sambat year changes in mid-April, so dates near that boundary are the easiest to get wrong by hand — let the converter handle it.
• Round only at the end. Keep the full precision the converter gives you until your final step, then round for presentation, so small errors do not compound.

Related guides

• The complete guide to free online PDF tools. Convert, merge, compress, and secure PDF documents — a natural companion once you have converted the numbers and dates inside them.
• Browse every converter. The full hub, with each tool one click away.
• Browse all image tools. Resize, compress, and transform images alongside the format converters above.

Frequently asked questions

Are these converters free? Yes. Every converter linked in this guide is free to use with no account and no sign-up.

Do my files or numbers get uploaded anywhere? No. Conversions run inside your browser, so the values and images you enter never leave your device.

How accurate are the results? Each converter uses exact, standard conversion factors, so results are precise to the number of decimal places shown. Rounding only happens for display.

Can I convert in both directions? Yes. The unit converters are bidirectional — enter a value in any field and every other unit updates automatically.

Why is a kilobyte 1,024 bytes and not 1,000? Digital storage is based on powers of two, so each step up (KB, MB, GB, TB) multiplies by 1,024. The data storage converter handles this for you.

What is the difference between AD and BS dates? AD is the Gregorian calendar used internationally; BS is the Bikram Sambat calendar used officially in Nepal, running about 56–57 years ahead. Use the BS to AD and AD to BS converters to switch between them.

Conclusion

Whatever you need to convert — a distance, a weight, a temperature, a file size, a date, or an image format — there is a focused, free tool for it on ShreePrati, and each one gives an instant, accurate answer without an install or an account. Bookmark the converters hub so the right tool is always one click away, and pair it with the PDF tools guide when your conversions feed into documents you need to finish and share.