Base64 Encoder / Decoder — Free Online Tool
Convert any text string or binary file to Base64 encoding, or decode Base64 data back to readable text. Useful for embedding images in CSS, encoding API credentials, or inspecting encoded data in JWTs and emails. Supports both standard and URL-safe Base64 alphabets.
100% client-side. No uploads. Your data never leaves your browser.
How to use Base64 Encoder / Decoder
- Paste text or drop a file into the input area.
- Select 'Encode' or 'Decode' — the tool auto-detects based on whether input looks like Base64.
- Choose standard or URL-safe alphabet if needed.
- Copy the output with the Copy button.
Frequently Asked Questions
What is the difference between standard and URL-safe Base64?
Standard Base64 uses + and / characters which are special in URLs. URL-safe Base64 replaces them with - and _ so the string can be used directly in a URL query param.
Can I encode binary files?
Yes. Use the file drop area to load any binary file (images, PDFs, etc.) and the tool will Base64-encode the raw bytes.
Does encoding compress my data?
No. Base64 encoding increases data size by approximately 33% compared to the original binary.
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