🔤 Base64 Encoder & Decoder

Base64 Encoder Decoder free online. Convert text and files to Base64 and back. URL-safe Base64 supported. No data sent to server. Instant encoding and decoding.

🔒 100% Free · No Login · Works in Browser

About Base64 Encoder Decoder

Base64 is an encoding scheme that converts binary data into a text string using 64 printable ASCII characters. It is widely used in web development for embedding images directly in HTML and CSS, encoding data in JWT tokens, sending binary data in JSON APIs, and storing binary files in text-based systems like XML.

Base64 is not encryption — it does not protect data. Anyone can decode a Base64 string instantly. Its purpose is to convert binary data into a format safe for text-based transmission. A Base64 encoded string is typically about 33% larger than the original data.

Common Uses of Base64

Embedding small images directly in HTML as data URIs to reduce HTTP requests, storing binary data in JSON payloads, encoding email attachments in MIME format, encoding credentials in HTTP Basic Authentication headers, and storing binary data in databases that only support text fields.

📖 How to Use

Open the Tool

The tool loads instantly — no installation needed

Enter Your Data

Input your text, file, or values

Get Results

Get instant results and download or copy

❓ Frequently Asked Questions

Is Base64 the same as encryption?+

No. Base64 is encoding not encryption. Anyone can decode Base64 instantly. It is used to convert binary data to text format for safe transmission — not to protect or hide data. Never use Base64 for security.

Why does Base64 end with == sometimes?+

Base64 works in groups of 3 bytes. If the input is not divisible by 3, padding characters = are added to make the output length a multiple of 4. One = means one byte of padding, two == means two bytes.

What is URL-safe Base64?+

Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces + with - and / with _ so the encoded string can be safely used in URLs and filenames without encoding.

How much larger is Base64 than the original?+

Base64 encodes every 3 bytes as 4 characters, so the output is exactly 33.33% larger than the input. A 100KB image becomes approximately 133KB when Base64 encoded.

Can I encode images to Base64?+

Yes, use the File tab to upload an image and get its Base64 data URI. You can embed this directly in HTML as src="data:image/png;base64,..." to display images without separate HTTP requests.