Free Base64 Encoder & Decoder Online
The best free base64 encoder and decoder online. Encode text to base64 or decode base64 strings back to plain text instantly.
Privacy & Trust First
"Security is paramount when handling API keys or configuration strings. Unlike hosted converters that log your inputs, Axonix uses the browser's native `atob()` and `btoa()` functions. Your data is processed entirely in your browser's local memory, meaning sensitive strings never traverse the network or touch a server disk."
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Axonix Base64 Converter & Developer Inspector is a fast, privacy-first utility that runs directly in your browser. Get started in seconds: Toggle the mode to either 'Encode' (Text to Base64) or 'Decode' (Base64 to Text).
- 1Toggle the mode to either 'Encode' (Text to Base64) or 'Decode' (Base64 to Text).
- 2Paste your source material into the input field. The tool handles multi-line strings effortlessly.
- 3Click the action button to perform the transformation instantly.
- 4Inspect the output for accuracy and use the copy button to transfer it to your clipboard.
- 5Use the 'Swap' button to quickly reverse the transformation or verify your results.
- Bidirectional Processing: Seamlessly switch between encoding and decoding with a single click.
- Developer-First Precision: Perfect for handling JWT parts, Basic Auth headers, and data URIs.
- Standard RFC 4648 Compliance: Guaranteed compatibility with all modern programming languages and web APIs.
- Zero-Latency Results: Instant browser-native processing with no server-round trips required.
- Privacy-Hardened: 100% client-side execution. Your secrets remain on your local machine.
- Large Payload Support: Handles massive strings and complex JSON blobs without performance degradation.
Expert Use Cases
API Development & Debugging
Quickly decode Basic Auth headers or inspect JWT payloads during backend troubleshooting and integration testing.
Data URI Generation
Encode small assets or SVG strings to create data URIs for CSS or HTML embedded images.
Email Header Inspection
Decode email subjects or body parts that are encoded in Base64 for transport across legacy systems.
Configuration Mangement
Safely encode config files or environment variables that need to be passed as single-line strings in CI/CD pipelines.
Cross-Language Data Passing
Standardize complex data formats into safely transportable ASCII strings for inter-service communication.
Frequently Asked Questions
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Need practical guides, walkthroughs, and troubleshooting tips? Explore the Axonix blog for detailed tutorials.