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Base64 encoding – Overview
Base64 encoding converts binary data (or text) into a string of ASCII characters (A–Z, a–z, 0–9, +, /). It's used to safely embed binary data in JSON, XML, URLs, or email. Encoding runs in your browser—your data is never uploaded. You can encode text or upload files.
When to use Base64 encoding vs other formats
Use the encoder when you have raw text or a file and need a Base64 string—e.g. for data URIs, APIs, or storage. Use the decoder when you have a Base64 string and need the original text or file. Encoding does not encrypt; for secrecy use encryption. For hashing (checksums), use a hash generator instead.
Compatibility
Base64 is a standard; output is compatible with any system that accepts Base64. Some contexts use URL-safe variants (e.g. replacing +/ with -_). Our tool produces standard Base64. All processing is client-side so your data stays on your device.
Quality considerations
Encoding is lossless—decoding returns the exact original. Base64 increases size by about 33%. Don't use Base64 for sensitive data unless combined with encryption; Base64 is encoding, not security.
Example use cases
- Create data URIs for embedding images or fonts in HTML/CSS.
- Encode file content for API payloads or JSON storage.
- Prepare binary or text for systems that accept only ASCII.
- Encode credentials or tokens for headers (prefer proper auth when possible).
- Convert local files to a string for paste or transfer in text-only channels.
Powered by browser APIs and client-side processing.