Base64 Encoder & Decoder
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Base64 is the encoding scheme behind data URIs, email attachments, and API tokens, and this base64 encoder decoder lets you convert text to base64 or reverse a base64 string back to readable text in a single click. Developers, students, and anyone debugging an API payload can paste a string, see instant output plus size metrics, and copy the result without waiting on a server round-trip. Because every byte is processed locally in your browser, sensitive strings like auth headers or config snippets never leave your device. There's no file upload, no account, and no rate limit slowing you down. Scroll down to paste your text or Base64 string and get a clean result right away.
Features
- Instant two-way Base64 encode and decode
- Live character and byte size metrics for input and output
- Handles standard and URL-safe Base64 alphabets
- One-click copy of encoded or decoded output
- Supports large text blocks without lag
- Works entirely offline once the page is loaded
- No character limit imposed by a server
- Clear error messages for malformed Base64 input
Why use this base64 encoder / decoder?
- Encodes and decodes instantly with no server round-trip delay
- Runs 100% client-side, so your text and tokens never get uploaded anywhere
- Produces spec-accurate Base64 output every time
- Simple paste-and-go interface with no learning curve
- Completely free with no signup or usage caps
Frequently asked questions
What is Base64 encoding used for?
Base64 converts binary or text data into an ASCII-safe string so it can travel safely through systems that only handle text, such as email, JSON payloads, or data URIs.
Is this Base64 tool safe for sensitive data like API keys?
Yes. All encoding and decoding happens locally in your browser using JavaScript; nothing is ever sent to a server.
Why does my decoded Base64 output look like garbled text?
That usually means the input wasn't valid Base64 to begin with, or it represents binary data (like an image) rather than plain text.
Does Base64 encoding count as encryption?
No. Base64 is a reversible encoding, not encryption — anyone can decode it instantly, so it should never be used to protect secret data.
Can I encode special characters and emoji?
Yes, the tool correctly handles UTF-8 text including emoji and non-Latin characters before encoding to Base64.
What's the difference between standard and URL-safe Base64?
URL-safe Base64 replaces the '+' and '/' characters with '-' and '_' so the output can be used directly inside URLs without extra encoding.
From the blog
What Is Base64 and Why Do Developers Use It?
What is Base64? A plain-English explanation of the 64-character alphabet, the 3-bytes-to-4-characters math, padding, the 33% size cost, and where it is used.
Base64 Is Not Encryption: Correcting a Dangerous Myth
Is Base64 encryption? No. Here is why encoding provides zero confidentiality, how anyone decodes it instantly, and what to use instead when data must stay secret.
What Are Data URIs? Base64 Images Explained
How a base64 image works, what the data URI syntax means, why encoding adds ~33% to file size, and the narrow cases where embedding an image in CSS pays off.