Base64 Encode/Decode
Encode text to Base64 or decode Base64 back to text. Free, private, browser-based Base64 encoder and decoder.
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About this tool
About Base64 Encode/Decode
Base64 Encode/Decode is a free, browser-based tool that encodes text to Base64 or decodes Base64 back to text. Base64 converts binary or text data into an ASCII-only string using 64 printable characters, which makes it safe to transport through systems that only handle plain text — email MIME bodies, HTTP Basic Authentication headers, data URIs, JWT segments, and JSON payloads. Toggle between encode and decode mode, paste your input, and read the live output instantly. Invalid Base64 input shows a clear error rather than producing garbage output. Everything runs locally on your device, so your strings are never uploaded to a server. There's no sign-up, no watermark, and no limit.
How to use Base64 Encode/Decode
1
Select Encode or Decode
Toggle between encoding text to Base64 or decoding Base64 back to readable text.
2
Enter Your Text
Type or paste the text to encode or the Base64 string to decode.
3
View Live Output
Watch the result appear instantly as you type. Invalid Base64 shows an error.
4
Copy the Result
Click copy to send the encoded or decoded output straight to your clipboard.
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Key features
Data Encoding
Safely encode text or decode hashes with accurate, standards-compliant Base64 conversion in both directions.
Browser Based
No software installation required. Everything runs locally, so conversion works without a backend or API key.
Completely Free
No hidden limits or premium paywalls. Encode and decode as many strings as you need, as often as you need.
100% Private & Secure
Base64 Encode/Decode processes your data locally in the browser. Nothing is uploaded, tracked, or stored — your files never leave your device.
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Professional Base64 Encoding Applications
Trusted by developers, engineers, and system administrators worldwide
Web Development
Encode assets as data URIs or decode encoded payloads when debugging front-end and API code.
ExampleDecode a data URI in a stylesheet to see the original image source, or inspect an encoded API request body.
Authentication Debugging
Inspect HTTP Basic Auth headers and JWT segments to verify credentials and claims during development.
ExampleDecode an Authorization header to confirm the username and password pair your client is actually sending.
Email and MIME Handling
Encode and decode email attachments and message parts that travel as Base64 within MIME structures.
ExampleDecode a Base64 email attachment body to recover the original file when troubleshooting delivery issues.
Data Migration and Storage
Safely store binary blobs inside text-based formats like JSON, XML, or SQL without corruption.
ExampleEncode small binary payloads before inserting them into a JSON column, then decode on read.
API and Log Analysis
Decode Base64 values found in API responses, cookies, and log entries to understand what they contain.
ExampleDecode an opaque session cookie value to reveal the underlying user identifier and expiry data.
Pro Tips for Working with Base64
Trusted by software engineering and web development experts globally
Never Use Base64 as Encryption
Base64 is reversible by anyone with no key. For confidentiality you need real encryption such as AES, not encoding.
Verify With a Round Trip
After encoding, decode the result and compare it to the original. A round trip catches silent corruption early.
Choose the Right Variant for URLs
Standard Base64 contains '+', '/', and '=', which are unsafe in URLs and filenames. Use the Base64URL variant in those contexts.
Expect a Size Increase
Base64 adds about 33% overhead. For large payloads, transmit raw binary instead of inflating it through encoding.
Mind the Character Encoding
Encode UTF-8 bytes, not raw characters. Skipping the UTF-8 step is the usual cause of mangled non-ASCII output.
Strip Whitespace Before Decoding
Line breaks and trailing spaces pasted from logs or emails commonly break decoding. Trim the input first.
Treat Decoded Output as Untrusted
Content you decode from an external source may be malicious. Never execute or render decoded data without validation.
Prefer Native Encoding for Large Data
For bulk file conversion, use a language library or streaming tool. Browsers are ideal for quick inspection, not batch jobs.
Bookmark for Fast Debugging
Bookmark Base64 Encode/Decode so decoding a header, cookie, or token during debugging takes seconds.
