Is this Base64 tool Unicode-safe?

Yes. It uses TextEncoder and TextDecoder to handle Unicode correctly, so characters beyond ASCII including emoji work as expected.

How do I make URL-safe Base64?

Use the URL-safe variant where the plus sign is replaced with a hyphen and the slash is replaced with an underscore. Padding may be omitted depending on your use case.

Does any data leave my browser?

No. All encoding and decoding is performed locally in your browser and nothing is uploaded.

Base64 Encoder & Decoder

Base64 Encoder/Decoder

Text

File

Input Text

Output

Encoded or decoded result will appear here...

0 Input Size (bytes)

0 Output Size (bytes)

0% Size Change

File Upload

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Drop file here or click to select

Maximum file size: 10MB

File Name

File Size

Base64 Encoded Result

Encoded file data will appear here...

0 File Size (bytes)

0 Encoded Size (bytes)

0% Size Increase

Upgrade to Base64 Pro for unlimited conversions and advanced features!

Convert text and small files to and from Base64 with full Unicode support (emoji, Bangla, and all scripts). Runs entirely in your browser — no uploads, no tracking, 100% privacy-friendly. Base64 Standard (RFC 4648)

Base64 Encoder/Decoder – Frequently Asked Questions

Yes. We encode bytes via TextEncoder and decode via TextDecoder, so emoji and non-ASCII scripts round-trip correctly.

Replace + with - and / with _. You may remove trailing =. This tool’s decoder accepts URL-safe input automatically.

Usually due to stray characters or bad padding. Remove whitespace and ensure the length is a multiple of 4 (add = as needed). This tool normalizes most of that for you.

Yes—remove the data:*;base64, prefix first, then paste only the Base64 part.

No. All encoding/decoding happens locally.

Yes. After the first load, the page works without internet.

Base64 Encoder/Decoder

Base64 Encoder/Decoder – Frequently Asked Questions

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