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Base64 Encoder & Decoder

Encode text or images to Base64 and decode Base64 back to text or images instantly in your browser. Free, private, and no installation required.

100% Private – Runs in Your Browser

All Base64 encoding and decoding is performed entirely in your browser using the Web API. Your text and images are never uploaded to any server — everything stays on your device.

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What Is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that converts binary data (such as images, files, or arbitrary bytes) into a string of ASCII characters. The name comes from the 64 characters used: A–Z, a–z, 0–9, and the symbols + and /. Base64 is widely used in email (MIME), HTML data URIs, JSON APIs, and cryptographic certificates (PEM format). It allows binary data to be safely transmitted over systems that only handle text.

When to Use Base64 Encoding

Base64 is commonly used to embed images directly into HTML or CSS using data URIs (data:image/png;base64,…), to transmit binary file attachments via email or API, to store binary data in JSON without escaping issues, and to encode cryptographic keys, certificates, and tokens. Our tool handles all these use cases and also supports encoding and decoding entire image files.

Base64 Image Encoding

The Image tab lets you drag-and-drop or upload any image (PNG, JPG, GIF, WebP, SVG) and instantly converts it to a Base64 data URI. This is particularly useful for embedding small icons, logos, and inline images in HTML emails, CSS stylesheets, and single-page applications, eliminating the need for external HTTP requests.

Base64 Tool vs Paid Alternatives

Commercial API tools and developer IDEs with built-in Base64 converters are either behind paywalls or require installation. This free tool works instantly in any browser with no setup, no account, and no usage limits. It processes all data client-side for complete privacy — ideal for encoding sensitive tokens, credentials, or proprietary image assets.

Free Base64 Encoder & Decoder – Encode Decode Text & Images Online

Got Questions? We have you covered

No. Base64 is an encoding scheme, not encryption. Anyone with the Base64 string can decode it back to the original data instantly. It should not be used to secure sensitive information. For security, use proper encryption algorithms such as AES or RSA.

Base64 increases the data size by approximately 33%. Every 3 bytes of input data become 4 Base64 characters. This overhead is the trade-off for representing binary data using only safe ASCII characters.

A data URI is a URI scheme that embeds data inline in a web page. For example, a Base64-encoded image can be embedded directly in HTML as: . This eliminates a separate HTTP request for the image resource.

Standard Base64 uses + and / characters, which must be URL-encoded in query strings. URL-safe Base64 replaces them with - and _ respectively. If you need URL-safe Base64, use the URL-safe option if available, or manually replace + with - and / with _ in the output.

Yes. All encoding and decoding happens entirely in your browser. Your text and images are never sent to any server, stored anywhere, or accessible to anyone else. The tool processes everything locally using built-in browser APIs.

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