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Base64 Encoder & Decoder

Encode text or files to Base64, decode Base64 back to text, and convert images to Base64 data URLs - all client-side, nothing uploaded.

Encode to Base64

Base64 Encode and Decode Online

Base64 is a binary-to-text encoding scheme first standardised in RFC 1421 (1993) and refined in RFC 4648 (2006). It represents binary data using a 64-character alphabet of A-Z, a-z, 0-9, and the symbols + and /, with = as padding. Every 3 bytes of input become 4 Base64 characters, resulting in roughly a 33% size increase. Despite this overhead, Base64 remains indispensable in web development because it allows binary content - images, PDFs, audio files - to be embedded directly inside JSON payloads, CSS stylesheets, or HTML without breaking text protocols.

Common Uses in Indian Tech Projects

Indian developers working on payment gateway integrations (Razorpay, PayU, Instamojo) frequently use Base64 for encoding API credentials and webhook signatures. IRCTC and government e-governance portals use Base64 to transmit Aadhaar-linked document images over secure APIs. It is also used to encode JWT tokens in OAuth2 flows, where the header and payload sections are Base64url-encoded strings.

Using This Tool

Paste any text or upload a file and click Encode to get the Base64 string. Paste a Base64 string and click Decode to retrieve the original content. The image-to-Base64 feature generates a data URI you can paste directly into a CSS background-image or HTML img src attribute - eliminating an extra HTTP request for small icons and logos.

Base64 Questions

Base64 converts binary data (or text) into a string of 64 printable ASCII characters. It is used to embed binary data inside text-based formats like JSON, XML, HTML, or email. Common uses: embedding images as data URLs in CSS, encoding API tokens, and transmitting binary data in HTTP headers.

Standard Base64 uses + and / characters which have special meaning in URLs. URL-safe Base64 (RFC 4648) replaces + with - and / with _, and omits = padding. Use URL-safe Base64 for JWT tokens, API keys, file names, or anything that appears in a URL.

Base64 encoding increases data size by approximately 33% - it produces 4 ASCII characters for every 3 input bytes. For images embedded as data URLs, the browser doesn't make an additional HTTP request, which can be a worthwhile trade-off for small icons or logos.

Our tool handles Unicode (including Hindi, Tamil, and other Indian languages) by first converting text to UTF-8 bytes before applying Base64 encoding. This ensures characters outside ASCII are correctly encoded. Simply paste your text in the Encode tab and click Encode.

Yes - all encoding and decoding runs in your browser using JavaScript's built-in btoa() and atob() functions. No data is sent to any server. It is safe to use with tokens, credentials, or any private content. Note that Base64 is encoding, not encryption - it does not hide the content, only transforms the format.
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