Encode and decode Base64 strings instantly. Client-side, private, no limits.
Encode any file type to Base64 for API payloads or data transfer.
Convert images to Base64 data URIs for embedding in CSS or HTML.
Decode and inspect JWT tokens to view headers, payloads, and claims.
Encode or decode URLs and query parameters with percent-encoding.
Convert special characters to HTML entities and back.
Convert between hexadecimal and Base64 encoding formats.
Decode Base64 strings back to viewable images with preview.
Decode any Base64 string back to its original file with auto-detection.
Decode Base64 PDF documents and view them instantly in browser.
Base64 is an encoding system designed to represent bytes as readable text using an alphabet that is safe for any digital channel. It transforms groups of three bytes into four ASCII characters, preventing mail headers, web forms, or logging systems from rejecting the information. When you copy and paste strings into this tool, you are turning binary data into a sequence that travels without errors through protocols built for plain text.
The conversion introduces roughly a 33 % increase compared with the original size. That expansion is the cost of ensuring compatibility, but it is acceptable when you need to transmit certificates, API keys, small images, or embedded JSON snippets. If the string begins with symbols such as +, /, or ends with equal signs, that is expected—padding is part of the specification and allows the original bits to be reconstructed during decoding.
Encoding the word Hello (first 3 bytes: Hel)
Every 3 bytes of input produce 4 Base64 characters — a ~33% size increase.
MIME encodes email attachments (images, PDFs, binary files) in Base64 so they can travel safely through text-only email servers.
Embed images, fonts, or other assets directly in HTML or CSS using data:image/png;base64,…, eliminating extra HTTP requests.
HTTP Basic Auth encodes username:password in Base64. JWT tokens use Base64URL for their header and payload sections.
Send binary data (images, PDFs, keys) through JSON APIs or XML documents that only support text characters.
Store TLS certificates, private keys, and secrets in YAML or JSON config files (e.g., Kubernetes secrets) as Base64 strings.
Share binary data as text — paste a Base64 string into a chat message, issue tracker, or terminal without corrupting binary content.
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