Base64 Encoder & Decoder — Encode or Decode Text Instantly

Encode any plain text string to Base64 or decode a Base64-encoded string back to readable text — all instantly in your browser with nothing sent to a server. Base64 encoding is widely used in APIs, JWTs, data URIs, and email attachments, making this tool a daily staple for developers.

Why use this Base64 Converter?

  • Encode plain text to Base64 or decode Base64 strings back to text
  • Processes everything client-side — your data never leaves your browser
  • Handles standard Base64 and URL-safe Base64 variants
  • Free, instant, no account required — works on any device

How to use the Base64 Converter

  1. Choose encode or decode: Select whether you want to convert plain text to Base64 or decode a Base64 string back to text.
  2. Paste your input: Enter or paste the text or Base64 string you want to convert into the input field.
  3. Get the output instantly: The converted result appears immediately below — no button press required.
  4. Copy the result: Use the copy button to grab the output and paste it into your code, API request, or configuration file.

Frequently Asked Questions

What is Base64 encoding used for?

Base64 encodes binary or text data into a string of ASCII characters, making it safe to transmit through systems that only handle text. Common uses include encoding images in data URIs for CSS, embedding credentials in HTTP Authorization headers (Basic Auth), and encoding JSON payloads in JWTs (JSON Web Tokens).

Is Base64 the same as encryption?

No. Base64 is encoding, not encryption — it's fully reversible with no secret key. Anyone who sees a Base64 string can decode it. Never use Base64 alone to protect sensitive data; use it alongside proper encryption when security matters.

Why does my Base64 string end with == or =?

Base64 works in groups of 3 bytes. When the input length isn't a multiple of 3, padding characters (=) are added to complete the last group. One = means one byte of padding; == means two. This is normal and expected.

What is URL-safe Base64?

Standard Base64 uses + and / characters, which have special meaning in URLs. URL-safe Base64 replaces + with - and / with _, making the string safe to include in query parameters or path segments without percent-encoding. JWTs use URL-safe Base64.

Can I use this to encode images to Base64?

This tool encodes text. To convert an image file to a Base64 data URI (for embedding images in HTML or CSS), use the Image to Base64 tool on AllTools, which handles binary file uploads directly.

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