free · in-browser · no upload
Drop your Hex codes file. We'll convert it to CMYK right here in your browser, your file never leaves your device.
Select your file here to get started
or drop your file here.
Accepts .txt, .hex
How it works
Click the dropzone above or drag a Hex codes 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 CMYK 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
A plain text list of hex color codes (e.g. #FF6B35, one per line). The most portable color-list format, any modern design tool accepts hex. Often the format used by color-palette generators (Coolors, Adobe Color, Khroma) for export.
How to open
Any text editor. Pastes directly into design tools.
CMYK describes how much cyan, magenta, yellow, and black ink to lay down to produce a color on paper — each channel 0 to 100%. It's the print industry's color model because printers add ink (subtractive color) instead of emitting light (additive RGB). The same color almost always renders slightly differently on-screen vs in print because the gamut differs. Required by every commercial print shop and built into Photoshop's print prep workflow.
How to open
Adobe Photoshop, Illustrator, InDesign all natively work in CMYK mode (Image → Mode → CMYK Color). Affinity Photo, GIMP via plugins. Print-shop submission portals accept CMYK PDFs directly.
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.
Color palette interchange between web/design tools. Print-shop color specifications and prepress workflows. The most common reason to convert is compatibility, CMYK works in places where Hex codes doesn't, or vice versa.
Any text editor. Pastes directly into design tools.
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.
