File ↔ Base64 Converter
7 toolsConvert a file to Base64, or decode Base64 back to a file.
Runs in your browser — your files and text stay on your device
A complete encoding toolkit — Base64 and URL encode/decode, convert files to and from Base64, encode/decode HTML entities and Base32, convert internationalized domain names with Punycode, and decode or sign JWTs. All directly in your browser, which matters since tokens and encoded data often carry sensitive information.
Base64 & URLJWT DecoderJWT GeneratorFile ↔ Base64HTML Entity Encode/DecodeBase32 Encode/DecodePunycode (IDN) Converter
File → Base64
Base64 → File download
How to use this tool
- 1Upload a file to get its Base64 text and data URL.
- 2Or paste a Base64 string / data URL to decode and download the original file.
- 3Everything happens locally — files are never uploaded.
Frequently asked questions
What's a data URL?
A string embedding a file directly, like data:image/png;base64,..., usable anywhere a URL is expected without a separate network request.
Is there a file size limit?
No hard limit, but very large files (tens of MB) may be slow to encode in the browser.
Is my file uploaded anywhere?
No — encoding and decoding both happen entirely in your browser.