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About this Tool
Base64 is a binary-to-text encoding scheme that converts binary data - like images, files, or raw bytes - into a string of ASCII characters.
It's widely used in web development and software engineering because many data transfer protocols - like HTTP, email (MIME), and JSON APIs - work with text and can't reliably handle raw binary data.
Base64 lets you safely transmit or embed binary content anywhere that only accepts text. Common use cases include embedding images in HTML/CSS, encoding credentials for HTTP Basic Auth, handling JWT tokens, and transmitting files through REST APIs.
Whether you're debugging a JWT token, embedding an image in a CSS file, or transferring binary data through a text-based API - Base64 encoding is something every developer eventually needs.
Our Base64 Converter makes it effortless: encode plain text or files to Base64, decode Base64 strings back to readable content, inspect JWTs, and handle special modes like URL-safe encoding, hex, and JSON.
All directly in your browser. No server. No uploads. No privacy concerns.
How to use
- Choose your mode: Encode (text/file to Base64) or Decode (Base64 to text/file)
- For text encoding, type or paste your input into the text field
- For file encoding, upload an image, PDF, audio file, or any other file type
- Select a variant if needed , standard Base64, URL-safe Base64, or JWT decode mode
- Copy the output with one click or download the decoded file if applicable
- For JWTs, switch to JWT mode to see the decoded header and payload in JSON format
Benefits
- Instantly encode or decode Base64 without writing a single line of code
- Inspect and decode JWT tokens to debug authentication issues
- Embed images, fonts, or files as Base64 strings in HTML and CSS
- Supports URL-safe Base64 encoding for query parameters and API calls
- All processing happens in your browser , no files or strings are uploaded
- Handles multiple modes: text, file, hex, JSON, HTML, UTF-8, and JWT
FAQs
What is Base64 encoding and when do I need it?
Base64 is an encoding method that converts binary data into a plain text string made up of letters, numbers, and symbols. You need it when you want to transmit binary content (like a file or image) through a channel that only handles text , such as a JSON API, an email, or an HTML attribute.
How do I decode a JWT token using this tool?
Switch to JWT mode, paste your full JWT token (the three-part string separated by dots), and the tool will decode and display the header and payload sections as formatted JSON. Note that JWT signature verification requires your secret key and is not performed by this tool.
What is the difference between standard Base64 and URL-safe Base64?
Standard Base64 uses '+' and '/' characters, which have special meanings in URLs and can cause issues when used in query parameters. URL-safe Base64 replaces '+' with '-' and '/' with '_', making the encoded string safe to use directly in URLs without additional encoding.
Can I encode images and files to Base64?
Yes. You can upload any file , image, PDF, audio, video, font , and the tool will convert it to a Base64 string. This is useful for embedding images as data URIs in HTML and CSS, which eliminates the need for a separate HTTP request to load the image.
Is my data safe when I use this tool?
Completely. All encoding and decoding happens locally in your browser using JavaScript. No data is sent to any server, no files are uploaded, and nothing is logged or stored. It's fully private.
Can Base64 be used for encryption or data security?
No. Base64 is encoding, not encryption. It can be decoded by anyone who knows the Base64 alphabet , which is public. Never use Base64 to protect sensitive data. Use proper encryption methods like AES-256 or RSA for security purposes.