Base64 Encoder & Decoder
Convert text or any file to Base64, or decode Base64 back to readable text or the original file. Handles UTF-8, URL-safe base64url and data URLs.
Runs in your browser — nothing is uploaded Free, no limits
Text or file to encode
Result
Output appears here.How to use the Base64 Encoder/Decoder
- Choose Encode or Decode.
- Type or paste your text — or pick a file to encode.
- The result updates instantly as you type.
- Copy the result, download it, or copy it as a data URL for files.
Frequently asked questions
What is Base64 encoding?
Base64 represents binary data using 64 safe ASCII characters (A–Z, a–z, 0–9, + and /). It's used to put files and binary data inside text formats like JSON, email (MIME), HTML and CSS data URLs.
Is Base64 encryption?
No. Base64 is an encoding, not encryption — anyone can decode it. Never use it to hide passwords or secrets.
Why is the Base64 output bigger than the input?
Every 3 bytes of input become 4 Base64 characters, so encoded data is about 33% larger (plus line breaks if you wrap lines).
What is URL-safe Base64 (base64url)?
base64url replaces + with - and / with _ and drops the = padding, so the result can be used in URLs, file names and JWTs without escaping. This tool decodes both variants automatically.
Are my files uploaded?
No. Encoding and decoding run entirely in your browser; your text and files never leave your device.