Free Base64 Encoder
Base64 turns binary data into plain ASCII text — essential for embedding images in HTML, sending attachments through text-only protocols, and stuffing tokens into URLs. The Base64 Encoder handles text with full Unicode support or any file on your device, with optional URL-safe output and MIME-style line wrapping. Everything is encoded locally; nothing is uploaded.
The file is read locally — it is never uploaded.
How to Use the Base64 Encoder
- Type text or choose a file to encode.
- The Base64 output updates live as you type.
- Toggle URL-safe or line wrapping if you need those variants.
- Copy or download the result.
Features
Text and file encoding; Unicode-safe; URL-safe variant; 76-character line wrapping; output size display; copy and download.
Benefits & Use Cases
Embed small images or fonts as data URLs, prepare API payloads, encode credentials for test headers, or convert files for email-safe transport.
Tips
Base64 inflates data by about 33% — don't use it for large files you must keep small. Base64 is encoding, not encryption: anyone can decode it, so never use it to 'protect' secrets.
Frequently Asked Questions
What is Base64?
Base64 is a way to represent binary data using 64 safe ASCII characters (A–Z, a–z, 0–9, +, /). It is used wherever only text is allowed, like JSON payloads, data URLs, and email attachments.
Is Base64 encryption?
No. It is a reversible encoding with no key — anyone can decode it instantly. Never rely on Base64 to hide passwords or sensitive data.
What is URL-safe Base64?
A variant that replaces + and / with - and _ and drops padding, so the output can sit safely in URLs and filenames without percent-encoding.
Why did my file get bigger?
Base64 encodes every 3 bytes as 4 characters, adding roughly 33% overhead. That is the price of text-safe transport.
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