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Base64 Encoder — Encode Text to Base64 Online

Encode text or file contents to Base64 format instantly in your browser. Output updates in real time as you type. Supports standard Base64 and URL-safe Base64 variants. Useful for embedding images in HTML/CSS, creating HTTP Basic Auth headers, encoding API tokens, and transmitting binary data as plain text.

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Input Text

How to Use Base64 Encoder — Encode Text & Files to Base64 Online

1
Type or paste the text you want to encode into the input field on the left.
2
The Base64 encoded output appears instantly in the right panel — no button to press.
3
Toggle between standard Base64 and URL-safe Base64 (replaces + with - and / with _) if needed.
4
Click "Copy" to copy the encoded string to your clipboard.
5
Use the encoded output in your code: HTML data URIs, Authorization headers, API request bodies.

Frequently Asked Questions

What is Base64 encoding and how does it work?▾

Base64 is an encoding scheme that converts binary data into a string of 64 printable ASCII characters (A–Z, a–z, 0–9, + and /). It works by taking 3 bytes of input (24 bits) and splitting them into 4 groups of 6 bits each. The result is about 33% larger than the original data. Base64 is not encryption — the original data is trivially recoverable by decoding.

When should I use Base64 encoding?▾

Common use cases: (1) Embedding images in HTML/CSS as data URIs — avoids an extra HTTP request. (2) HTTP Basic Auth headers — credentials encoded as Base64(username:password). (3) Binary data in JSON payloads. (4) Email attachments in MIME format. (5) Binary data in text-only database fields.

What is the difference between standard Base64 and URL-safe Base64?▾

Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces + with - and / with _, making the output safe for URLs and filenames. JWT tokens use URL-safe Base64.

Does Base64 encoding compress data?▾

No — Base64 increases data size by approximately 33%. Every 3 bytes of input become 4 bytes of output. This is the opposite of compression.

Is Base64 encoding secure for passwords or sensitive data?▾

No — Base64 provides zero security. It is trivially reversible. Never use Base64 to protect passwords or secrets. HTTP Basic Auth sends credentials Base64-encoded, which is why it must always be used over HTTPS.

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