free · in-browser · no upload
Drop your CSS file. We'll convert it to ASE right here in your browser, your file never leaves your device.
Select your file here to get started
or drop your file here.
Accepts .css
How it works
Click the dropzone above or drag a CSS from your desktop. Files of any size, there's no upload, so there's no upload limit.
The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.
Get your ASE the moment the conversion finishes. Convert another, or close the tab.
Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.
Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.
No account required. No watermark on the output. No queue. Drop a file, get a converted file.
Formats involved
CSS describes how HTML elements should be displayed, colors, fonts, layout, animations. Plain text. Every browser parses CSS to render web pages. Modern CSS has cascade variables, container queries, and a vibrant ecosystem of preprocessors and frameworks (Tailwind, PostCSS).
How to open
Any text editor. Browsers parse CSS automatically when linked from HTML.
ASE is Adobe's binary palette format used across Creative Cloud (Photoshop, Illustrator, InDesign). Each entry stores RGB/CMYK/Lab/Grayscale color values plus a name. Designed for sharing brand color systems between team members, load an ASE in Photoshop and the swatches appear in your Swatches panel.
How to open
Photoshop, Illustrator, InDesign, Affinity apps, Krita, GIMP (with plugin), Procreate.
Related tools
FAQ
Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.
Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.
Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.
Web styling; design system distribution. Brand color systems shared across Adobe Creative Cloud teams. The most common reason to convert is compatibility, ASE works in places where CSS doesn't, or vice versa.
Any text editor. Browsers parse CSS automatically when linked from HTML.
Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.
Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.
