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Base64Encoder

Encode or decode Base64 strings securely in your browser—perfect for payloads, auth tokens, and QA.

Client-side onlyCopy-friendly outputLarge payload ready

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ModeEncode
Characters0

Plain text

Base64 output

Base64 output will appear here…

Base64 quick facts

Base64 converts binary data into ASCII text so it can travel safely through systems that only handle text. This tool processes everything locally—which means it's safe for API secrets, private payloads, and one-off debugging.

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What is a Base64 Encoder?

Base64 encoding converts binary data or text into a string of safe ASCII characters that can travel through systems built for plain text. Developers use it for data URIs that embed small images in CSS or HTML, basic auth headers, JWT payloads, and stuffing binary payloads into JSON. A base64 encoder and decoder lets you convert in both directions, and the better tools handle files too so you can turn a small PNG into a data URI in one step.

How to use this Base64 Encoder

  1. 1

    Pick encode or decode

    Encode turns plain text or a file into a base64 string. Decode turns a base64 string back into the original text or file.

  2. 2

    Paste your input

    Drop in the string you want to convert. For files, use the upload button to encode an image, PDF, or any binary asset.

  3. 3

    Choose the right variant

    Standard base64 uses + and / characters. URL-safe base64 swaps them for - and _ so the string works in URLs and filenames.

  4. 4

    Copy or download the result

    Copy the encoded string to your clipboard, or download a decoded base64 string back to its original file format.

  5. 5

    Verify the round trip

    When debugging, encode then decode to confirm you get the original bytes back. Mismatches usually mean a character set or padding issue.

Frequently asked questions

Is base64 a form of encryption?

No. Base64 is encoding, not encryption. Anyone can decode it instantly. Never use base64 alone to protect passwords, tokens, or sensitive data.

Why does base64 make my data bigger?

Base64 uses 4 characters to represent every 3 bytes of input, so the encoded output is roughly 33 percent larger than the original. That is the tradeoff for making binary data safe to embed in text.

When should I use base64 instead of just linking to a file?

Use it for small assets under a few kilobytes where the extra HTTP request costs more than the size bloat, like tiny icons in CSS. For larger files, a normal URL is better because browsers can cache it.

What is a data URI?

A data URI embeds a file directly inside a URL using the format data:mediatype;base64,encodeddata. It lets you inline images or fonts in HTML or CSS without a separate file.

Does this tool upload my files to a server?

No. Encoding and decoding happen in your browser using built-in JavaScript APIs. Your files and strings never leave your device.

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