Base64 Toolbox

Everything you need for Base64 in one place. Encode text or files to Base64, decode any Base64 string back to plain text or binary, generate data URIs for embedding images inline in HTML/CSS, switch between standard and URL-safe alphabets, and validate & inspect unknown Base64 blobs to detect their content type. Everything runs in your browser — nothing is uploaded anywhere.

✓ No uploads · 100% client-side

✓ Supports UTF-8 & binary files

✓ URL-safe Base64 (RFC 4648 §5)

✓ Magic-byte content detection

Standard Base64 · RFC 4648

Plain Text

0 chars · 0 bytes

Base64 Output

0 chars

URL-safe No padding

File → Data URI / Raw Base64

📂

Drop any file here, or click to browse

Images will preview automatically

URL-safe Base64 · RFC 4648 §5

Uses - and _ instead of + and / — safe for URLs, filenames, and HTTP headers without percent-encoding.

Plain Text

URL-safe Base64

Strip padding (=)

Convert existing Base64

Paste standard Base64 (with +//) to get the URL-safe equivalent, or vice-versa.

Standard Base64 (+ /)

URL-safe Base64 (- _)

Validate & Inspect

Paste any Base64 string — standard or URL-safe — to check its validity, detect the content type, and peek at the decoded output.

Base64 Input