Encode text
Paste any text and instantly get its Base64 representation — perfect for data URIs and transport.
Embed images in CSS & HTML
Convert images to Base64 data URIs for inline embedding without external network requests.
Decode to image, audio, or PDF
Paste a Base64 string and preview or download the original file the tool auto-detected.
URL-safe Base64
Switch to URL-safe encoding that replaces + and / with - and _ for use in URLs and filenames.
Decode JWT payloads
Paste a JSON Web Token and read its decoded header and claims without a separate debugger.
Decode HTTP Basic Auth
Inspect the username and password encoded in an Authorization: Basic header.
Base64 Encoder / Decoder runs entirely in your browser tab. No data is uploaded, no server processes your input, and no account is required.
Decode, verify (HMAC/RSA/ECDSA), encode, and compare JWTs side-by-side.
Security & Auth
Decode SSL/TLS certificates, chains, SANs, and fingerprints.
Security & Auth
Preview and debug Open Graph and Twitter Card social share metadata.
Web & Network
Inspect WHOIS, DNS, SSL, IP geolocation, and certificate transparency.
Web & Network