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Encode UTF-8 text to Base64 with URL-safe mode. Use when encoding only; for full encode+decode workflow use base64. Input: text ≤10MB. Returns Base64 string. 100% client-side.
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A dedicated standalone Base64 encoder that converts text or file input into Base64 with support for three character encodings (UTF-8, ASCII, UTF-16LE, UTF-16BE). Features include file upload with drag-and-drop, real-time encoding as you type, byte-size comparison between input and output, and optional data URI prefix for embedding files in web documents.
Many workflows require fast, focused encoding without the distraction of a decoder. A streamlined interface for converting text or small files to Base64 for embedding in code, configuration, or data transfer.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Frontend developers embedding assets in CSS/HTML, backend developers preparing test payloads, mobile developers encoding data for HTTP headers, and technical writers creating documentation with embedded examples.
Type or paste your text into the input area, or drag-and-drop a file — input is encoded as you type
Select the character encoding: UTF-8 (recommended), ASCII (strict 7-bit), UTF-16LE, or UTF-16BE
Toggle 'Data URI' on/off — when enabled, output is prefixed with 'data:...;base64,' header
Monitor the input/output byte counter showing encoding size inflation (~33%)
Copy the encoded result with 'Copy' button, or 'Copy as Data URI' for direct embedding
Configure line wrapping (every 76 chars) in Settings for compatibility with email/MIME standards
Input: 'Hello World!' | UTF-8 | No Data URI => Output: 'SGVsbG8gV29ybGQh'Input: [red 16x16 PNG icon] | Data URI ON => Output: 'data:image/png;base64,iVBORw0KGgo...'What is the difference from the combined Base64 tool?
The dedicated encoder always encodes, giving a simpler interface.
Can I encode multiple files at once?
One file at a time. For batch, use the combined Base64 tool.
Does the tool work offline?
Yes, it runs entirely in the browser with no server communication needed.
What MIME type is used for data URI?
Auto-detected from file extension. Unknown types use application/octet-stream.
Authoritative specifications, standards, and in-depth reading for Base64 Encoder.
Free 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.
Convert 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.
Free online URL encoder and decoder for query strings and components. Private client-side conversion.
Encode/decode HTML entities (& < >). Use for HTML text; for URLs use url-encoder. Input: text ≤10MB. Returns encoded/decoded text. 100% client-side.
Convert text to binary and back. Use for binary strings; for other bases use base-converter. Input: text ≤10MB. Returns 0/1 string or decoded text. 100% client-side.
Convert text to hex and back. Use for hex encoding; for hashes use hash-generator. Input: text ≤10MB. Returns hex string or decoded text. 100% client-side.
Escape/unescape JS strings. Use for code literals; for JSON strings use json-escaper. Input: text ≤10MB. Returns escaped text. 100% client-side.
Translate text to Morse code and back. Use for learning or signaling. Input: text ≤10MB. Returns dots/dashes or decoded text. 100% client-side.