Base64 Decoder
Decode Base64 strings back to plain text instantly in your browser. Convert encoded data from APIs, emails, and data URIs back to readable content
TEXT CODE
Encode Decode
Tip: paste a Base64 string on the left — output updates instantly.
Runs 100% Locally in Your Browser
This tool processes your data entirely on your device. Nothing is uploaded, stored, or sent to any server.
No Uploads
Privacy First
Secure by Default
Related Tools
List to Comma Separated Paste a list (one item per line) and convert it into a single string with your chosen separator
JSON Beautifier Paste your minified or messy JSON and get clean, properly indented output for easier reading, debugging, and development
JSON Minify Convert formatted or messy JSON into inline JSON instantly. Minify JSON by removing unnecessary whitespace and generate a compact single-line string
CSS Minifier Paste your CSS and get a compact, minified version instantly. Remove comments, whitespace, and redundant characters to reduce file size and improve page load performance
Frequently Asked Questions
How to decode a Base64 string back to plain text?
Paste the Base64-encoded string into the input and the tool instantly outputs the decoded text.
Why does a Base64 encoded string end with = or ==?
Base64 encodes data in 3-byte blocks; = padding is added when the input length isn't a multiple of three.
What happens if I try to decode an invalid Base64 string?
The tool will report a decode error — common causes are missing padding characters or characters outside the Base64 alphabet.
What is the difference between Base64 decoding and decryption?
Decoding reverses an encoding scheme and requires no key; decryption reverses encryption and requires a secret key.
What format should the Base64 input be in?
Standard Base64 uses A–Z, a–z, 0–9, +, /, and = padding; URL-safe variants use - and _ instead of + and /.
Are my inputs stored or logged anywhere when decoding Base64?
No. Decoding runs entirely in your browser — nothing is stored, logged, or transmitted.