Base64 Encoder & Decoder
Convert text to Base64 encoding and decode Base64 strings back to plain text. Free and instant.
Input Text
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Output
Converted text will appear here
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Why use our Base64 Encoder/Decoder?
Encode & Decode Instantly
Convert text to Base64 or decode Base64 strings back to readable UTF-8 with one click.
UTF-8 Safe
Handle emoji, accented characters, and multilingual content without garbled output.
100% Client-Side
API tokens, credentials, and file snippets stay in your browser — nothing is uploaded.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is widely used to embed binary data in JSON, XML, email (MIME), and data URLs, and to transmit arbitrary bytes over text-only channels like HTTP headers and query strings.
Our free online Base64 encoder and decoder converts plain text to Base64 and reverses the process for inspection or editing. Use it when debugging JWT segments, preparing data URI images, decoding API payloads, or verifying encoding in authentication flows. All operations run locally in your browser.
Base64 Tool Features
- Encode text:Transform UTF-8 strings into standard Base64 representation.
- Decode Base64:Convert Base64 back to the original plain-text content.
- UTF-8 support:Correctly handles Unicode characters beyond basic ASCII.
- Copy & download:Copy results to the clipboard or download output as a text file.
- Live stats:See character and word counts for input and output as you work.
- Privacy:Encoding and decoding happen entirely on your device with no server calls.
Common Use Cases
JWT & Token Debugging
Decode Base64URL header and payload segments when inspecting JSON Web Tokens during auth work.
API Integration
Encode Basic Auth credentials or binary attachments before sending REST or GraphQL requests.
Data URI Images
Encode small SVG or PNG files as data:image Base64 strings for inline HTML or CSS.
Email & MIME
Understand how email clients encode attachments and multipart message bodies.
Config & Env Vars
Decode Base64 secrets from Kubernetes secrets, Docker configs, or CI environment variables.
Learning & Demos
Show how binary-safe encoding works without writing a one-off script in Python or Node.
How to Use the Base64 Encoder/Decoder
Paste Your Input
Enter plain text to encode or a Base64 string to decode in the input field.
Choose Encode or Decode
Click the encode button for text-to-Base64 or decode to reverse an existing Base64 string.
Review the Output
Check the converted result and verify character counts match your expectations.
Copy or Download
Copy the output for your API call, config file, or ticket — or download it as a file.
Benefits of Using a Base64 Encoder/Decoder
No Scripting Required
Skip terminal one-liners and Python snippets for quick encode/decode tasks.
Safe for Sensitive Data
Local processing means tokens and secrets are not exposed to third-party APIs.
Instant Verification
Confirm whether a string is valid Base64 and what it decodes to before using it in production.
UTF-8 Correctness
Avoid mojibake when encoding international text or emoji in web applications.
Works Anywhere
Use from any browser on desktop or mobile without installing developer tools.
Completely Free
Unlimited encode and decode operations with no registration.
Base64 Encoding Tips
- •Base64 is not encryption: Anyone can decode Base64 — never treat it as a security layer for secrets.
- •Padding characters: Standard Base64 may end with = or == padding; some URL-safe variants omit or replace them.
- •Size increase: Base64 expands data by roughly 33% — factor that in for large file transfers.
- •URL-safe variants: JWTs use Base64URL where + becomes - and / becomes _; convert if standard decode fails.
- •Line breaks in email: MIME may wrap long Base64 lines — remove whitespace before decoding wrapped strings.
- •Pair with hash generator: Encode data for transport, then hash the original bytes separately for integrity checks.
Start Encoding and Decoding Base64 Now
Whether you are debugging JWT payloads, preparing API credentials, or decoding config secrets, our free Base64 encoder and decoder handles UTF-8 text instantly in your browser.
Scroll up, paste your input, and convert locally with no registration required. Completely free, and your data stays 100% private on Quick Note.
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Frequently Asked Questions
What is Base64 encoding used for?
Base64 encodes binary data as ASCII text so it can travel through JSON, XML, email, URLs, and other text-based protocols without corruption. It is common in APIs, data URIs, and authentication headers.
Is Base64 the same as encryption?
No. Base64 is an encoding scheme, not encryption. Anyone can decode it. Do not use Base64 alone to protect sensitive information.
Does this tool support UTF-8 characters?
Yes. The encoder and decoder handle UTF-8 text including emoji, accented letters, and non-Latin scripts correctly.
Why does my decoded output look like gibberish?
The input may not be valid Base64, may use URL-safe characters without conversion, or may represent binary data rather than text. Verify the source encoding format.
Is my data sent to a server?
No. Encoding and decoding run entirely in your browser. Your input never leaves your device.
What are the = characters at the end?
Equals signs are padding that align the encoded output to a multiple of four characters. Some systems omit padding in URL-safe Base64 variants.
Can I encode binary files?
This tool focuses on text input. For large binary files, use a desktop utility or language library — browser memory limits apply to very large payloads.
Is the Base64 encoder/decoder free?
Yes. It is completely free to use with no registration, downloads, or hidden fees.