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Base64 Encode/Decode

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Base64 Encode & Decode — Free Online Tool

Encode text or files to Base64 and decode Base64 strings — all in your browser.

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01Paste your text or Base64 string into the input area.
02Choose whether to encode or decode.
03Copy the result with one click.

About Base64 Encode/Decode

Base64 is a binary-to-text encoding scheme widely used in data URIs, email attachments (MIME), API payloads, JSON Web Tokens, and embedded resources. Whenever you need to represent binary data as plain text — for transmission through text-only protocols or embedding in source code — Base64 is the standard solution. This tool encodes plain text or a dropped file to Base64, and decodes Base64 strings back to readable text. Encoding reads a file's raw bytes, so images, PDFs, and other binary types come out as a string you can paste into a data URI or a config file, and UTF-8 text round-trips without mangling. Decoding accepts URL-safe Base64 (- and _, padding optional) as well as line-wrapped input such as PEM bodies and kubectl secret values. Use it to encode an image for a data URI, read a Base64 string returned by an API, or check what a section of a token actually contains — nothing is uploaded, so it is safe for values you would not paste into a web service.

Questions

Is my data sent to a server?

No. Encoding and decoding happen entirely in your browser using the built-in btoa/atob functions and TextEncoder/TextDecoder APIs.

Can I encode files to Base64?

Yes. Switch to File mode when encoding to upload any file and get its Base64 representation.

Does it handle Unicode text?

Yes. The tool uses TextEncoder/TextDecoder to properly handle UTF-8 characters including emoji, CJK characters, and other non-ASCII text.

Can I decode line-wrapped or URL-safe Base64?

Yes. Whitespace is stripped, - and _ are converted to + and /, and missing padding is restored before decoding — so PEM bodies, secret values wrapped at 76 columns, and JWT segments all decode without any cleanup.

Can I decode Base64 back into a file?

No — decoding always produces text. A Base64 string that encodes an image or PDF will decode to garbled characters, because the output is interpreted as UTF-8 text rather than saved back as a file.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.

Related

URL Encode/DecodeEncode and decode URLs, query strings, and form parameters. Handles unicode, reserved characters, and percent-encoding correctly.TXT → URLJWT DecoderDecode JWT tokens to inspect header, payload claims, and expiration. Tokens are parsed locally — never sent to a server, safe for production debugging.JWT → JSONHTML Entity Encode/DecodeEncode and decode HTML entities — convert special characters like <, >, & to HTML-safe text and back. Supports numeric and named entities.TXT → HTMLHash GeneratorGenerate SHA-1, SHA-256, SHA-512, and MD5 hashes from text or files. Use for integrity checks, fingerprints, and quick deduplication.TXT → HASH