Base64decode: online Base64 encoding and decoding in seconds
Base64decode is the dedicated base64decode online encoder and decoder for developers who need fast, accurate conversions. Paste any string, switch between encoding or decoding, and copy the result instantly with a JSON pretty print preview that makes complex payloads easy to audit.
Choose a Conversion Tool
Text Encoder & Decoder
Encode or decode plain text strings to and from Base64 format.
Image to Base64
Convert images to Base64 data URIs for embedding in CSS or HTML.
Base64 to Image
Decode Base64 strings back to viewable images with preview.
File to Base64
Encode any file type to Base64 for API payloads or data transfer.
Base64 to File
Decode any Base64 string back to its original file with auto-detection.
Base64 to PDF
Decode Base64 PDF documents and view them instantly in browser.
JWT Decoder
Decode and inspect JWT tokens to view headers, payloads, and claims.
URL Encode/Decode
Encode or decode URLs and query parameters with percent-encoding.
HTML Entity Encode/Decode
Convert special characters to HTML entities and back.
Hex ↔ Base64 Converter
Convert between hexadecimal and Base64 encoding formats.
Why Base64decode?
Base64decode explains Base64 conversion with practical examples so your encoded assets travel through email gateways, JSON payloads, or logging pipelines without corruption.
Online Base64decode app
Base64decode loads from our website and requires an active internet connection. Once the page is open, conversions happen in your browser with no tracking scripts or hidden requests.
JSON pretty print preview
Decode a string and open the preview to see neatly formatted JSON with syntax-aware spacing, giving base64decode online the feel of a built-in inspector for API responses and configuration files.
Built for teams
Share consistent Base64decode workflows with copy-to-clipboard, instant status feedback, and the same UX across desktop or mobile.
FAQs
Does Base64 encoding make my data secure?
Base64 is not an encryption algorithm—it simply represents binary data using a safe character set. Pair it with proper encryption if you need confidentiality.
Can I decode URL-safe Base64 values?
Yes. Replace hyphens with plus signs and underscores with forward slashes before decoding, or paste them directly—Base64decode normalises whitespace automatically.
What limits should I expect?
The browser handles large strings well, but Base64 inflates content size by roughly 33 %. Keep that in mind when sharing encoded attachments or logs.
What is the difference between standard Base64 and URL-safe Base64?
Standard Base64 uses + and / as special characters, while URL-safe Base64 replaces them with - and _. URL-safe encoding avoids issues when passing data in query strings or filenames.
Can I encode binary files like images or PDFs to Base64?
Yes. Use the File to Base64 or Image to Base64 tools above. They read raw bytes and produce a Base64 string you can embed in HTML, CSS, JSON, or send via API.
Why does my Base64 string end with one or two equal signs?
The = padding characters ensure the encoded output length is a multiple of four. Some implementations strip padding, but Base64decode handles both padded and unpadded input correctly.
Is it safe to paste sensitive data into this tool?
All encoding and decoding happens entirely in your browser—no data is sent to our servers. Your input never leaves your device, so it is safe for sensitive or private content.
How do I decode a Base64-encoded JWT token?
Use the JWT Decoder tool above. It splits the token into its three parts (header, payload, signature), decodes each Base64 segment, and displays the JSON contents for easy inspection.