Free tool
Encoder / Decoder
Base64, URL and HTML-entity encode and decode — all in your browser.
About this tool
Encode or decode Base64, URL components and HTML entities side-by-side. A handy developer tool when you need to inspect a token, prepare a query string or escape HTML — without pasting sensitive data into a random website.
How to use the Free Base64, URL & HTML Encoder / Decoder
- Pick the encoding you need (Base64, URL or HTML entity).
- Paste your input on the left.
- Read the encoded or decoded result on the right.
- Click swap to convert in the other direction.
- Copy the output to the clipboard with one click.
Frequently asked questions
- Is my input sent to a server?
- No. Encoding and decoding use native browser APIs (btoa, atob, encodeURIComponent), so your data stays local.
- What's the difference between URL encode and Base64?
- URL encoding escapes characters unsafe in URLs (like spaces). Base64 represents arbitrary bytes as ASCII text and is used for binary-safe transport.
- Can it handle Unicode?
- Yes — we encode strings as UTF-8 before Base64, so emoji and non-Latin scripts round-trip correctly.
- Why does my Base64 string fail to decode?
- Usually because of stray whitespace or missing padding. Trim the string and ensure its length is a multiple of 4.