What characters get encoded?

Reserved and unsafe characters like spaces, &, ?, and # are converted to percent-encoded sequences such as %20.

URL Encoder / Decoder

Percent-encode special characters for use in URLs, or decode a percent-encoded URL string back to plain text.

Inputs

Results

Try an example

Formula

encodeURIComponent / decodeURIComponent

How Base64 Encoding Actually Works

What Base64 does to text and binary data, why it exists, and why it's not a form of security.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

Number Base Converter

Convert a number between binary, octal, decimal, and hexadecimal.

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

UUID Generator

Generate a random version 4 UUID.

CSS Unit Converter

Convert between px, rem, and em CSS units.

Aspect Ratio Calculator

Calculate the missing dimension to preserve an aspect ratio.