Base64 Encoder / Decoder
Easily encode text to Base64 or decode Base64 strings back to text.
About the Base64 Encoder/Decoder
Base64 is everywhere in modern web development — from data URIs and JWT segments to Basic Auth credentials and API keys. This encoder/decoder uses the modern TextEncoder / TextDecoder APIs so UTF-8 characters, emoji, and CJK text round-trip correctly (older atob/btoa-only tools mangle anything outside Latin-1). Everything happens client-side, so it's safe to paste real credentials, signed tokens, or API responses you cannot share with a hosted service.
Common use cases
- Encode credentials for Authorization: Basic headers
- Decode JWT payload segments without verifying the signature
- Inspect data URIs from CSS background-image or HTML img src
- Encode small images for inline embedding
- Decode webhook payloads that arrive base64-wrapped
Why client-side?
Every byte you paste, type, or upload here is processed entirely inside your browser. Nothing is sent to a server, logged, or stored. That means it's safe to use this tool on production secrets, customer data, internal logs, and any input you would not paste into a hosted SaaS formatter.
Related tools
- JWT Decoder Decode JSON Web Tokens locally in your browser. Inspect the header, payload claims, expiration time, and raw signature. Tokens never leave your device — safe for prod auth tokens.
- URL Encoder/Decoder Encode and decode URLs and query parameters instantly. Free online URL encoding tool.
- Image to Base64 Converter — Encode Images Online Convert images to Base64 data URIs instantly. Upload PNG, JPG, GIF, SVG, or WebP files and get embeddable Base64 strings for HTML and CSS. 100% client-side — your images never leave your browser.
- Hash Generator Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from any text or file in your browser using the Web Crypto API. No uploads. Use it to verify file integrity offline.
Frequently Asked Questions
- What is Base64 encoding?
- Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format using 64 characters. It's commonly used for embedding data in HTML, CSS, and emails.
- Is Base64 encoding secure?
- Base64 is an encoding scheme, not encryption. It's designed for data transport, not security. Anyone can decode Base64 strings.
- Can I encode files to Base64?
- This tool encodes and decodes text strings. For file encoding, you would need to read the file as binary data first.