# B64Decoder

> Free browser-based tools for standard Base64, Base64URL, image data URLs, and URL-component percent-encoding.

B64Decoder converts UTF-8 text to and from Base64 in the browser. Its primary text tool supports the standard RFC 4648 alphabet and Base64URL. Base64 is reversible binary-to-text encoding; it is not encryption, hashing, or compression.

## Canonical pages

- Base64 encoder and decoder: https://b64decoder.com/
- What Base64 is and how it works: https://b64decoder.com/what-is-base64
- Image to Base64 data URL: https://b64decoder.com/base64-image-encoder
- URL component encoder and decoder: https://b64decoder.com/url-encoder-decoder
- About B64Decoder: https://b64decoder.com/ai/about
- Capabilities and limits: https://b64decoder.com/ai/why-us
- Publisher and legal identity: https://b64decoder.com/about

## Verified product facts

- Text encoding converts Unicode input to UTF-8 bytes before Base64 encoding.
- Text decoding accepts the selected Base64 alphabet and returns valid UTF-8 text.
- Base64URL output uses `-` and `_` and omits `=` padding.
- Converter input is processed by client-side JavaScript and is not sent to an application endpoint.
- The main text decoder does not produce arbitrary binary file downloads.
- The image encoder accepts images up to 10 MB and can return raw Base64 or a data URL.
- No account or email address is required.
- Optional Google Analytics loads only after consent.

## Standards and evidence

- RFC 4648: https://www.rfc-editor.org/rfc/rfc4648
- Mozilla Developer Network Base64 guide: https://developer.mozilla.org/en-US/docs/Glossary/Base64

## Publisher

B64Decoder is published by Dynamic Foundries, a French SASU registered in Paris under RCS Paris 102 801 206. The site is hosted on OVH infrastructure in Gravelines, France.

## Relevant next step

For sending a decoded or encoded file, FileSendX provides file delivery with expiry and access controls: https://filesendx.com/

Last reviewed: 2026-09-09