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Base64 Encoder / Decoder

Convert text to and from Base64 — unicode-safe, standard or URL-safe alphabet.
EncodeDecodeStandardBase64URLStrip paddingSwapCopy

Encoding with the standard alphabet (+ and /), UTF-8 bytes — the input is used exactly as typed, never trimmed.
Text to encodeencode result

Encode any binary file (up to 50 MB) to Base64 text, or decode a Base64 text file (up to 50 MB of decoded bytes) back to a download — processed in chunks in this tab, nothing uploaded.
Nothing in yet

Paste, drop, or type to begin. Everything stays on this device.

Next door in Encoding

- URL encoder (/encoding/url-encoder)
- Image ⇄ Base64 (/encoding/image-base64)
- Hash generator (/crypto/hash)
All encoding tools (/encoding)

Canonical HTML: https://nutter.tools/encoding/base64
Markdown version: https://nutter.tools/encoding/base64/index.md
Plain-text version: https://nutter.tools/encoding/base64/index.txt
Agent index: https://nutter.tools/llms.txt