Base64 Encoder & Decoder

A clean, instant alternative for all your Base64 needs.

Processed locally — nothing is uploaded

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Input

Output

About Base64 Encode / Decode

Encoding inflates size by roughly a third — every three bytes become four characters — which is why an image inlined as a data URI always weighs more than the file it came from. Worth knowing before embedding anything large in CSS or JSON.

A fast, ad-light Base64 encoder and decoder for both text and files — a clean alternative to base64decode.org. Everything is processed in your browser, so nothing is uploaded.

Base64 is an encoding scheme that represents binary data using a 64-character ASCII alphabet, making it safe to embed inside text-based formats such as JSON payloads, data URLs, HTML, CSS and email (MIME) attachments. This converter lets you encode plain text or whole files into Base64 and decode Base64 back into its original form, in either direction, the moment you paste or drop your input.

It is the quick way to build a data URI for an image, inspect an encoded webhook payload, or move binary data through a channel that only accepts text. Base64 is an encoding rather than encryption — anyone can decode it, so on its own it protects nothing.

Learn how this works

A Practical Guide to Everyday Developer Encoding & FormattingHow and when to use Base64, JSON formatting, hashing, JWTs, regex and cron — with free in-browser tools for each task.11 min read Why In-Browser Tools Are More Private Than Uploading FilesWhat actually happens when you upload a file to an online converter, and why client-side tools remove that risk entirely.7 min read Character Encoding Explained: ASCII, Unicode and UTF-8Why text turns into question marks and mojibake, what Unicode actually is, and how UTF-8 fixed a decades-old mess.5 min read

Frequently asked questions

Why does my Base64 string fail to decode?

Usually padding or the wrong alphabet. Standard Base64 pads with = to a multiple of four characters, while Base64URL swaps + and / for - and _ so the value survives in a URL. Feeding one to a decoder expecting the other fails.

Is Base64 a form of encryption?

No, and treating it as one is a genuine security mistake. It is a reversible encoding designed to move binary data through text-only channels — anyone can decode it instantly. Use real encryption for anything secret.

Why is encoded data larger than the original?

Base64 represents every three bytes as four characters, so output is about 33% bigger. That is the cost of making binary safe for text transport, and why inlining large images as data URLs bloats a page.

Pro Tips

→Paste raw text or files and toggle between encoding/decoding to verify data integrity in APIs and authentication tokens.
→Use the copy button to instantly grab encoded strings for headers, environment variables, and config files.
→Encode images or binary data to embed directly in HTML data URIs or email MIME messages.
→Decode JWT tokens to inspect payload claims without external libraries.

Common Use Cases

•Decoding a Base64 payload from an API response or webhook
•Reading an encoded value out of a config file or token
•Converting a data URL back into its original content

How It Compares

Unlike online tools such as base64decode.org which require manual copy-paste, our encoder/decoder provides instant real-time conversion with file upload support, similar to CyberChef but with a cleaner UI focused solely on base64 operations and no learning curve for quick encoding tasks.

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