Base64 Encode
Convert plain text to a Base64-encoded string. Runs entirely in your browser — nothing is uploaded.
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What is Base64 encoding?
Base64 is a binary-to-text encoding that represents arbitrary byte sequences using only 64 printable ASCII characters: A–Z, a–z, 0–9, +, and /. An equals sign (=) is used as padding so the output length is always a multiple of four. Base64 is not encryption — it is a way to safely carry binary data through systems that only handle text, such as email bodies, JSON payloads, URLs, or HTML attributes.
How to use this Base64 encoder
- Paste or type your text into the left panel, or click Upload to load a file.
- Optionally enable URL-safe output or remove the padding characters.
- Click Encode →. The Base64 result appears instantly on the right.
- Click Copy or Download to export the result.
Common uses for Base64
- Embedding images in HTML or CSS with
data:image/png;base64,…URIs. - Email attachments — MIME uses Base64 to wrap binary attachments into the text body.
- JSON & JWT tokens — binary payloads inside JSON are typically Base64-encoded.
- Basic auth headers — HTTP
Authorization: Basicencodesuser:passas Base64. - URL tokens — the URL-safe variant is used in OAuth, JWT, and short links.
Privacy
This tool works 100% in your browser. Your input never leaves your device — no server, no analytics on your content, no third-party uploads. You can disconnect from the internet and it will still work.