Dev Tools

Encoding and decoding, code formatting, hashes, time and colour conversion. No install, no sign-up — everything runs inside your browser.

Encode & Decode

Base64 EncodeTurn text or a file into a Base64 string. Pick the URL-safe alphabet and the line-wrap width you need.
Base64 DecodeTurn a Base64 string back into text or a file. base64url, missing padding and stray line breaks are handled for you.
URL EncodeTurn spaces and special characters into %20-style percent encoding. Handles a single query value and a whole address differently.
URL DecodeTurn %C3%A9-style percent encoding back into readable characters. Double-encoded values come apart in one go.
HTML EscapeTurn < > & " into HTML entities so they are not read as markup. What you reach for when putting code inside a page.
HTML Entity DecodeTurn < and é back into the characters they stand for. Named and numeric references are both handled.
Image to Data URITurn an image file into a data URI you can paste into HTML or CSS. Shows you how much bigger it got.
Data URI to ImageTurn a data:image/... string back into a picture you can look at and save. Base64 and percent-encoded SVG both work.
SVG to CSS BackgroundEncode an SVG icon so it drops straight into a CSS background-image. Smaller than Base64.

Format & Minify

Hash & Generate

Convert & Inspect

Why do it here

Pasting a Base64 blob or a JWT into a random website is a bad habit. Those strings carry access keys and personal data, and most online tools convert them by posting the value to a server you know nothing about.

Every tool on this page runs as plain browser JavaScript. Once the page has loaded, nothing else goes over the network. Open your browser's Network tab, run a conversion, and watch: not a single request. It works on a plane.