Free online tools, all in one place.

Onsilio brings together free online tools for images, text, code, and everyday calculations — no signup, no watermarks, and most run right in your browser. Search for the tool you need, or browse by category below.

Browse all tools

Browse every tool by category

Free image tools, generators, developer utilities, and calculators — each grouped by category so you can scan straight to the one you need.

Image

1 live

Image converter

Convert between PNG, JPG, and WebP.

Generators

7 live

QR code generator

Encode a URL or text as a QR code.

Password generator

Generate a strong random password.

Word & character counter

Count words, characters, and reading time.

Age & date calculator

Age and the gap between two dates.

Unit converter

Convert between metric and imperial units.

Lorem ipsum generator

Generate lorem ipsum placeholder text.

Color picker

Convert between HEX, RGB, and HSL.

Developer

4 live

JSON formatter

Format, minify, and validate JSON.

Base64 encoder & decoder

Encode and decode base64 text.

URL encoder & decoder

URL-encode and decode text.

Case converter

Convert text between UPPER, lower, camelCase, snake_case, and more.

Calculators

5 live

Percentage calculator

Calculate any percentage in your browser.

Loan calculator

Calculate monthly loan payment and interest.

BMI calculator

Calculate Body Mass Index.

Compound interest calculator

Project savings growth over time.

Tip calculator

Calculate tip and split the bill.

All your online tools, in one place

Onsilio brings together free online tools for images, generators, developer tasks, and everyday calculations. Convert and compress images, remove backgrounds, generate QR codes and strong passwords, format and validate JSON, encode Base64, count words, and run quick unit, percentage, loan, and BMI calculations — all from one clean platform.

Every tool has its own dedicated page, so you can bookmark the exact utility you use most. Most tools run entirely in your browser, which means your files and text stay on your device — no signup, no watermarks, and no wading through a cluttered tool directory to get the job done.