Free online tools, no sign-up needed

Free online tools for everyday tasks

SuperDevTools brings together more than 390 free online tools, sorted by theme: work out a percentage, pick a winner at random, test a webcam, plan a holiday dinner or format JSON, without installing anything.

There is no account to create and no email address to hand over. Most tools run entirely in your browser, so your text, photos and PDF files stay on your device. To keep the tools you use most within reach, click “Add to favorites”: they will show up at the top of this page on your next visit, along with the ones you used recently.

Tools by theme

Holidays and celebrations

In December, the Advent calendar can be filled in online or printed, and the Secret Santa generator draws names, keeps couples apart if you ask and gives everyone a private link. Hosting? The party food calculator tells you how much to buy per guest, and the seating chart maker places guests around round tables.

Random pickers

Can't agree on where to eat or who does the dishes? Spin the random wheel with your own entries. The random team generator splits a class or a sports group into even teams, and the coin flip and dice roller stand in for the coin or die you can never find.

Games and puzzles

Got five minutes? Sudoku runs from easy to expert and prints out too, solitaire and minesweeper work with a mouse or a finger, and chess can be played against the computer or with a friend on the same screen.

Text and codes

The QR code generator makes a code for a link, a text or a wireless network, ready to download. The word counter gives the word and character count of an essay or a post, the case converter fixes text typed with caps lock on, and the number to words converter spells out an amount the way you write it on a check.

Calculators and time

This is the largest family: a percentage calculator for discounts and increases, an hours calculator to add up time worked, an age calculator that also counts the days between two dates, and a loan calculator with monthly payments.

Home and DIY

Before heading to the hardware store, work out the square footage of a room, how much paint you need, how many tiles to buy, or the concrete volume and number of bags for a slab.

Office and planning

Templates you fill in on screen, then print or download: invoice and quote, resume, yearly or monthly calendar and a weekly planner for the school week.

Colors

The color picker gives the HEX, RGB and HSL code of any shade, the HEX to RGB converter switches between notations, the palette generator suggests colors that work together, and the contrast checker tells you whether text stays readable on its background (WCAG).

Encryption and hashing

To encrypt a message with your own key, use AES 256 CBC encryption and its counterpart, AES 256 CBC decryption, also available in 128 and 192 bits and in ECB mode. You can also compute a SHA-256 hash or an MD5 hash, and run a password strength check before you settle on one.

Sound, image and screen

Before a video call, the webcam and mic test checks picture and sound. The dead pixel test fills the screen with solid colors so you can spot defects, JPG to PDF combines photos into a single document, and resize image makes a picture lighter before you email it.

For developers

For day-to-day work: format and validate JSON, convert a Unix timestamp to a date, test a regex against your own samples or generate UUIDs (v4 and v7).

Frequently asked questions

Are the tools really free?

Yes. Every tool is free, with no sign-up and no paid version. The site is funded by the ads shown on its pages.

What happens to the data I enter?

In most tools, nothing leaves your device: the calculation happens in the page and nothing is stored on our servers. A few tools, such as AES encryption or Base64 encoding, send your input to the server for the calculation and get the result back, and nothing is kept. Favorites and recently used tools are saved in your browser only.

Do the tools work on a phone?

Yes. Every page adapts to small screens and most tools work with a finger. Some hardware tests depend on the device: screen recording, for example, often needs a computer, and the page lets you know when your device does not support it.