Base64 Encoder / Decoder
Encode text strings and binary files to Base64 format, or decode Base64 back into clean text/files.
Base64 Encoder & Decoder
UTF-8 & Binary SafeConvert text strings, images, Data URIs, and binary files with 100% browser privacy.
What does Base64 Encoder / Decoder do?
To encode or decode Base64 data, paste your text or upload a file to ReadyForFile's free online Base64 Encoder / Decoder. Toggle between Encode and Decode modes, enable URL-safe encoding, or convert images directly to Base64 Data URIs with zero server uploads.
About Base64 Encoder / Decoder
Encode UTF-8 text strings, binary files, images, and credentials into Base64 format or decode Base64 strings back to clean original data. Supports standard Base64, URL-safe Base64 encoding (- and _), Data URI generation for web images and fonts (data:image/png;base64,...), HTML/CSS code snippet generation, and image preview. All operations run 100% locally inside your browser.
Features & Capabilities
- Dual mode: Text string conversion and Binary File / Image processing
- Bi-directional Swap button between Encode and Decode modes
- URL-safe Base64 toggle (replaces '+' with '-' and '/' with '_')
- Instant Base64 Data URI generator for web images & assets
- Generates copyable HTML <img> tags, CSS rules, and Markdown snippets
- Image preview tab for decoded or uploaded Base64 image payloads
- Live data size metric showing expansion ratio (+33%) and byte counts
- 100% client-side execution with total data privacy
Common Scenarios & Use Cases
- Encoding API authentication headers, basic auth tokens, and web credentials
- Embedding small PNG/SVG/JPG icons directly into HTML or CSS using Data URIs
- Decoding obfuscated configuration strings, webhooks, or email attachment streams
- Converting file uploads into Base64 format for web application payload testing
How to Use Base64 Encoder / Decoder
Select Mode & Action
Choose Text Mode or File Mode, then select whether to Encode or Decode.
Input Text or Upload File
Paste your text/Base64 string or drag and drop an image or binary file.
Copy Result or Download File
Copy the output string, HTML/CSS snippet, or download the decoded binary file to disk.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format using 64 characters (A-Z, a-z, 0-9, +, /). It is commonly used for data transfer in email, HTTP, and web APIs.
What is URL-Safe Base64 encoding?
Standard Base64 contains '+' and '/' characters, which have special meanings in URL query strings. URL-safe Base64 replaces '+' with '-' and '/' with '_', making the string safe to pass in web URLs.
Is my data uploaded to any server during encoding or decoding?
No. All Base64 conversions run 100% locally in your web browser using HTML5 FileReader and Web APIs. Your files and credentials never leave your browser.
Can I convert an image file to Base64?
Yes! Switch to File Mode, upload your image file, and ReadyForFile will output the Base64 Data URI along with copyable HTML <img> tags and CSS snippets.
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