Base64 Encode & Decode
Turn text or any file into Base64, and decode Base64 back into readable text or a file you can download. Results appear as you type, and nothing goes to a server.
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Converted on your device. Nothing is uploaded.
Encoding and decoding Base64
Conversion happens as you type, with no submit button and no round trip to a server. Text is encoded as UTF-8 first, so emoji, accented letters and non-Latin scripts come back exactly as they went in, and a URL-safe option covers tokens, JWT segments and query strings. Decoding accepts standard and URL-safe Base64, with or without padding and line breaks, plus full data: URIs. Need to embed a file? Drop any PDF, image, font or archive to get its Base64 string or data URI – or paste Base64 to rebuild the original file, with its real type detected for you. Because it all happens in your browser, API keys, credentials and private files are never uploaded or logged.
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Choose Text → Base64, Base64 → Text, File → Base64 or Base64 → File.
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Type or paste your text or Base64, or drop a file – the result shows up instantly.
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Copy the output, press Swap to reverse it, or download the decoded file.
What makes this Base64 Encoder / Decoder handy
Text and files
Encode and decode plain text or any type of file in one place.
Unicode safe
UTF-8 encoding keeps emoji and every language intact.
URL-safe mode
Read or write the - and _ alphabet used in URLs and JWTs.
Private
Secrets and files are handled on your device and never uploaded.
What people use the Base64 Encoder / Decoder for
Read API and JWT payloads
Decode the Base64 parts of tokens, headers and API responses.
Build HTTP auth headers
Create Basic auth strings and config values.
Embed files in JSON or HTML
Turn any file into a Base64 string or data URI.
Debug email and MIME content
Decode Base64 bodies and attachments.
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Developer tools that keep your code to yourself
Encode Base64, minify CSS, HTML and JavaScript, and debug regular expressions without your code leaving the tab. Tokens and test data stay in your browser, results update as you type, and there's nothing to install or sign up for.
Questions & answers
What's Base64 used for?
It turns any data into plain text from 64 safe characters, so binary files and special characters can pass through email, JSON, URLs, HTML and CSS. It's an encoding, not encryption – anyone can decode it.
Is it safe to decode API keys or tokens here?
Yes. Everything happens in your browser, so nothing you paste is sent to a server or stored.