Text · Files · Images · URL-safe
Base64Converter
Encode or decode Base64 — text, files, and images. Handles full Unicode, URL-safe variant, and binary detection. See file size overhead. All in your browser.
Samples:
When to Use Base64
Inline Images in HTML/CSS
Embed small images as data URLs to eliminate network requests for icons and UI elements.
JSON / API Payloads
Binary data cannot be sent as raw JSON. Base64 encodes it as a string field.
Email Attachments (MIME)
Email protocols are text-based. MIME uses Base64 to encode binary attachments.
Cryptographic Keys & Tokens
PEM certificates, JWT payloads, and many tokens use Base64 or URL-safe Base64.