What is Base64 encoding?

Base64 is an encoding scheme that converts binary data into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It is used to safely transmit binary data over text-based protocols like email, JSON APIs, and HTTP headers.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _ so the encoded string can be safely included in URLs and filenames without encoding. It is used in JWT tokens, OAuth, and web APIs.

Is Base64 the same as encryption?

No. Base64 is encoding, not encryption. Anyone can decode a Base64 string without a key. It is used to make data safe for transport, not to keep it secret. For security, use AES or RSA encryption.

Free Base64 Encoder & Decoder Online — URL-Safe Base64 | Devora

Free Base64 Encoder & Decoder

Encode any text or binary data to Base64, or decode Base64 strings back to plain text. Supports standard Base64, URL-safe Base64 (for JWT and OAuth), Unicode text, and padding control. Runs entirely in your browser — nothing is uploaded to any server.

✅ Encode to Base64✅ Decode from Base64✅ URL-Safe Base64✅ Unicode Support✅ No Server Upload✅ Free Forever

Base64 Encoder/Decoder

Encode text, decode Base64, and switch to URL-safe output when you need it.

ModeEncode

AlphabetStandard

OutputStandard Base64

Input

Text to encode

Type or paste plain text. Unicode is handled safely.

148 input bytes200 output bytes

Output

Standard Base64

Processing happens locally in your browser.

RGV2b3JhIEJhc2U2NCBkZW1vCgpFbmNvZGUgbWUsIGRlY29kZSBtZSwgb3Igc3dpdGNoIHRvIFVSTC1zYWZlIG91dHB1dCBmb3IgcXVlcnkgc3RyaW5ncyBhbmQgZmlsZSBuYW1lcy4KU3ltYm9sczogKyAvID0KVW5pY29kZTogY2Fmw6ksIPCfmoAsIOadseS6rA==

Alphabet: StandardEncode text or decode Base64 locally in your browser.

What this covers

Standard Base64 for regular payloads, plus URL-safe Base64 for query strings, paths, and token-like data.

Input behavior

Decoder accepts both standard and URL-safe alphabets, with or without trailing padding.

Why it matters

It keeps the common encode/decode loop in one place and removes the annoying padding and alphabet edge cases.

Frequently Asked Questions

How do I encode text to Base64?

Type or paste your text into the input field and select 'Encode'. The tool instantly converts it to Base64 using the browser's built-in btoa() function, with proper Unicode handling for non-ASCII characters.

How do I decode a Base64 string?

Paste the Base64 string into the input field and select 'Decode'. The tool uses atob() to convert it back to the original text. If the Base64 is URL-safe (uses - and _ instead of + and /), select the URL-safe option first.

Where is Base64 used in web development?

Base64 is used in: JWT tokens (the header and payload are Base64-encoded), embedding images in CSS/HTML as data URIs, Basic Auth headers (username:password encoded as Base64), email attachments (MIME), and storing binary data in JSON APIs.

What does 'invalid Base64' mean?

Base64 strings must use only the characters A-Z, a-z, 0-9, +, / (or - and _ for URL-safe). The length must be a multiple of 4. An invalid Base64 error means the string has illegal characters or incorrect padding (= symbols).