# Base64 encode & decode — in your browser, no upload

> Encode or decode Base64 text and files in your browser. No upload — the conversion runs locally, so secrets and data never leave your device.

Convert text or files to and from Base64 without pasting them into a remote service. The encoding and decoding happen locally in your browser.

Base64 shows up everywhere developers work: data URIs, JWT segments, email attachments, Kubernetes secrets, and API payloads that need binary-safe transport. The catch is that people often paste sensitive strings — tokens, keys, secrets — into random online encoders.

Doing it locally removes that risk entirely: the conversion is instant and the input never leaves the tab. You can switch between standard and URL-safe alphabets, and round-trip files as well as text.

Remember Base64 only encodes, it does not secure — to actually protect data use AES file encryption in the Security Vault, and to inspect a token's contents use the JWT decoder.

## How to

1. **Paste or drop input.** Type or paste text, or drop a file to encode; paste Base64 to decode.
2. **Choose direction.** Pick encode or decode, and the character set (standard or URL-safe) if needed.
3. **Convert.** The result updates instantly, computed on your device.
4. **Copy or download.** Copy the output text or download the decoded file.

## FAQ

### Is Base64 encryption?

No. Base64 is an encoding, not encryption — it is trivially reversible. Never use it to protect secrets; use real encryption for that.

### What is URL-safe Base64?

A variant that replaces the '+' and '/' characters (and drops padding) so the string is safe inside URLs and filenames.

### Can I decode a Base64 file, like an image?

Yes. Paste a Base64 string and download it back as the original binary file, or encode a file to a Base64 string.

### Is my data uploaded?

No. Encoding and decoding run in your browser tab; text and files never leave your device — useful when the data is a token or key.


## Related tools

- [JWT decoder](https://www.safepaper.app/security/jwt-decoder)
- [AES file encrypt](https://www.safepaper.app/security/file-encrypt)
- [QR code](https://www.safepaper.app/dev/qr-code)
- [JSON toolkit](https://www.safepaper.app/dev/json-toolkit)

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Canonical HTML: https://www.safepaper.app/dev/base64
Markdown: https://www.safepaper.app/dev/base64.md

There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check.