Best Base64 Encoder/Decoder for Developers
Free online base64 encoder/decoder designed for developers
Base64 encoding is used everywhere in development — API authentication headers, embedding images in CSS, encoding email attachments, and storing binary data in JSON. Our tool handles encoding and decoding instantly.
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Open Base64 Encoder/DecoderWhy It's the Best for Developers
- Instant encode and decode
- File upload support for binary encoding
- URL-safe Base64 option
- Image to data URI conversion
- Support for large payloads
Pro Tips for Developers
- Use Base64 for HTTP Basic auth: btoa(user:pass)
- Embed small images as data URIs to reduce HTTP requests
- Base64 increases size by 33% — use only when needed
- URL-safe Base64 replaces + and / with - and _