Base64 Encoder
Convert text or files to Base64 instantly. Encode UTF-8 text (emoji included), switch to URL-safe Base64url for tokens and URLs, or drop an image, PDF or any file to get its Base64 — optionally as a ready-to-use data: URI.
Type text to encode it as UTF-8 Base64 as you type, or drop a file (up to 25 MB) to encode its raw bytes. Tick URL-safe for the - and _ alphabet without padding, or “Output as data URI” to embed an image directly in HTML or CSS. Everything runs locally.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
Suggest a Feature or Improvement for Base64 Encoder
Need custom options, higher limits, or extra format support? Let our engineering team know!
How to use Base64 Encoder
- 1Type text, or drop a file.
- 2Choose standard or URL-safe Base64.
- 3For images, optionally output a data URI.
- 4Copy or save the result.
When to use Base64
Base64 represents binary data using 64 safe ASCII characters, so it can travel inside JSON, XML, email (MIME), HTTP headers (Basic auth) and URLs. It increases size by about 33%, so embedding large images as data URIs usually hurts performance — it's best for small icons.
Base64url replaces + and / with - and _ and drops = padding; it's used in JWTs and URLs.
Encoding is not encryption
Encoding changes how data is written so it can travel safely through URLs, HTML or text-only systems. It uses no key, so anyone can decode it instantly. Never use Base64, URL or HTML encoding to hide passwords or secrets — use encryption, or a password hash like bcrypt.
Frequently Asked Questions
How do I convert an image to Base64?
Drop the image, tick “Output as data URI”, and copy the result — it starts with data:image/…;base64, and can be used as an img src or CSS url().
Why does my Base64 differ from another tool?
Usually text encoding (we use UTF-8), a trailing newline, or URL-safe vs standard alphabet.
Is my code or data uploaded?
No. Everything runs in your browser; nothing you paste is sent to a server or stored.