Tukuk-OSThe mistake almost everyone makes
Right-clicking an image and saving it feels free, so people assume it is free. Legally, almost every photograph, illustration, and graphic is copyrighted the moment it is made — the default is "all rights reserved", not "no rights reserved". Reposting it on a blog, a slide deck, or a product page without permission is infringement even if you did not profit and even if you had no idea. The internet runs on a layer of media that was explicitly set free for reuse — but you have to know which layer you are standing on.
The licenses that actually let you reuse
Creative Commons (CC) is a family of standard licenses that let a creator say "yes, reuse this, with these conditions." The pieces combine:
- CC0 / Public Domain — no conditions at all. Use it, edit it, sell prints, no credit needed. The safest category.
- CC BY — free to reuse and adapt, even commercially, as long as you attribute the author.
- CC BY-SA — like BY, but your new work must carry the same license (the "share-alike" rule Wikipedia uses).
- CC BY-NC — non-commercial only. The moment your page has ads or sells something, be careful.
- CC BY-ND — no derivatives: you may repost it but not crop or edit it.
The two that trip people up are NC (commercial use banned) and SA (your remix inherits obligations). Read the exact letters, not the phrase "free image".
Attribution that is actually correct
Good attribution is not a watermark or a guess. Keep it simple and near the image: title, author, source link, and license name/link. One honest line does it: "『Dusk over the harbour』by A. Photographer, CC BY 2.0." That satisfies most CC-BY terms and shows a reader you did not claim the work. If the source offers a machine-readable credit string, copy it verbatim rather than paraphrasing.
Where to look for genuinely free media
Rather than reverse-image-searching a stranger's photo, start from repositories built for reuse. Tukuk's Creative Commons search surfaces Wikimedia Commons images and returns each result with its license and author baked in, so you know the terms before you download, not after a complaint. Search a term, filter, and reuse with the supplied credit. When a project demands zero obligations, narrow to CC0/public-domain sources.
The one-line rule
If you cannot find a license that says you may use it, assume you may not. The right habit is: find free-licensed media first, read the letters, and attribute once. Do those three and the whole "is this allowed?" anxiety disappears — and the same respect for creators is the reason tools on tukuk.org prefer open, no-tracking sources by default.