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What is Base64?
Base64 encodes binary data as 64 ASCII characters so it can travel safely in text formats like JSON or email. Decoding reverses the process to restore the original bytes.
Related tools
Try these DevStackIO tools for Base64:
Base64 Encoder/DecoderFree online Base64 encoder and decoder with URL-safe mode. Use as default for text; for split encode-only/decode-only URLs use base64-encoder/base64-decoder (aliases), for image files use image-to-base64. Input: text ≤10MB. Returns Base64 string or decoded text + error location. Convert instantly in your browser.Open tool →Base64 Image ConverterConvert images to Base64 encoded strings online for free. Use for image files only; for text use base64. Input: image file ≤10MB. Returns Base64 data URI for HTML/CSS/JS. Generate Base64 data URIs for embedding images directly in HTML, CSS, and JavaScript code.Open tool →
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About this glossary
Definitions are written in plain language and sourced from MDN Web Docs, W3C specifications, and RFCs. Related tools run 100% in your browser — no data leaves your device.
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