How does reverse image search actually work?
Instead of typing keywords, you give the search engine an image — a URL or an upload — and it looks for visual matches: the exact same image elsewhere on the web, near-duplicates, or pages containing similar-looking images. Google Lens and Bing also try to identify what is in the photo (a landmark, a product, a plant) and return relevant results even when no exact match exists.
Why do Google, Bing, Yandex, and TinEye find different things?
Each engine crawls and indexes the web independently, and each weighs "visual similarity" differently. TinEye is built specifically to find exact copies and where an image first appeared, which makes it strong for tracking down the original source. Yandex has historically indexed more of the Russian and Eastern European web, which makes it useful for faces and photos that Google and Bing miss. Google Lens and Bing lean more on object/scene recognition. Running the same image through all four is the only way to get full coverage.
Can I search with a photo straight from my phone?
Yes, but not through the URL box on this page — a URL only works if the image is already hosted somewhere public. Use the "Upload / drag & drop" tab instead: drop the photo in for a local preview, then use the direct links to open Google Lens, Bing, Yandex, or TinEye and upload the file on their own site (all four support drag-and-drop or "choose file" uploads directly on their search page).
Is my image uploaded anywhere when I use this tool?
No. This page has no backend and no image hosting — everything runs in your browser. In URL mode, we just build a link to each engine using the image URL you typed; your browser opens that link and the engine itself fetches the image from wherever it is hosted. In upload mode, the preview you see is a local object URL that never leaves your device; sending the actual file anywhere only happens if and when you upload it yourself, directly on Google, Bing, Yandex, or TinEye's own page.
Why would I use this instead of just going to Google Images?
You can — this just saves the four separate trips. Paste one image URL, get four properly-formatted search links (Google Lens, Bing, Yandex, TinEye) in one click each, instead of manually finding each engine's upload button and re-uploading the same image four times.