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Base64 Encoder — Free Online Tool
Base64 is a way of representing data using only letters, digits, plus and slash characters so it can travel safely through systems built for text, such as JSON, email, URLs and HTTP headers. This Base64 encoder and decoder converts in both directions. Pick Encode, paste your text and press Convert to get the Base64 string, or pick Decode and paste a Base64 string to read the original. The tool is UTF-8 aware, so accented letters, Hindi text and emoji survive the round trip instead of turning into question marks. Developers use Base64 to inspect JWT sections, build Basic authentication headers, embed small images in data URIs and debug API payloads. It is important to know that Base64 is an encoding, not encryption: anyone can decode it, so never treat it as a way to hide passwords or secrets. Encoded text is about a third larger than the original, which is the price of using a restricted alphabet. If decoding fails and an Invalid input alert appears, the string probably has missing padding characters, extra spaces or characters outside the Base64 alphabet. URL-safe variants that use dash and underscore instead of plus and slash need to be converted back before decoding. Everything is processed in your browser and nothing is sent to a server.
Use our Base64 Encoder on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.
How to use Base64 Encoder
- Select Encode or Decode.
- Paste your text or Base64 string into the box.
- Click Convert.
- Copy the result from the same box.
Key benefits
- ✓ 100% free — no paywall or trial limits
- ✓ No account or email required
- ✓ Mobile-friendly responsive design
- ✓ Instant results in your browser
- ✓ Secure — data stays on your device
- ✓ Trusted by thousands of users daily
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Frequently Asked Questions
How do I encode text to Base64?
Choose Encode, paste your text and press Convert. The text is replaced by its Base64 representation.
How do I decode a Base64 string?
Choose Decode, paste the Base64 string and press Convert to see the original text.
Is Base64 encryption?
No. Base64 is a reversible encoding that anyone can decode. Do not use it to protect passwords or private information.
Why do I get an Invalid input error?
The string may contain characters outside the Base64 alphabet, extra whitespace, missing padding or URL-safe characters that need converting back to plus and slash.
Does it support Hindi and emoji?
Yes. The tool encodes text as UTF-8 first, so non-English characters decode correctly.