YouTube, TikTok, Instagram, Facebook, Twitch, podcasts: pick the size, and the editor opens at exactly that canvas. No watermark, no signup, nothing uploaded.
A thumbnail is a small picture that has to be read in a second at the size a phone shows it. The job is the same on every platform; only the canvas changes. Choose the platform below and start with the right size, or drop an image and crop to any of them inside the editor.
Drag, drop or paste · JPG, PNG, WebP · opens in the editor, nothing is uploaded
Each card opens a blank canvas at that exact size. The sizes come from each platform's own published specs and are checked against live renders in the linked guides.
Choose the platform card for a blank canvas at the right size, or drop a photo and crop it to any ratio in the editor. Nothing is uploaded.
Big outlined text, a subject with the background removed, arrows and blocks. Keep text inside the platform's safe area; the guides show where the UI covers.
Check it at feed size, download a PNG or JPG with no watermark, and compress it if the platform has a size limit.
The editor does not care which platform a picture is for; it cares about the canvas. So this page is mostly a list of correct sizes with a button on each. YouTube wants 1280×720 and under 2 MB. TikTok and Reels covers are 1080×1920 but get shown as a square in the profile grid, so the subject has to sit in the middle. Facebook link images are 1200×630. Instagram posts are square or 4:5. Podcast covers are 3000×3000. Every one of those opens as a blank canvas at exactly that size, and the linked guide for each shows where the platform's own interface covers the picture.
The promise is the same whichever card you pick: the download is the canvas you made, with no watermark; there is no account and no email field; and the picture is processed on your device. The on-device tools page shows what runs where and counts the bytes that leave the page while they work, which is zero. If you specifically need the YouTube version with the spec, the layouts and the feed preview, use the free YouTube thumbnail maker.
Whatever the platform, the picture will be read at a fraction of its export size. Three to five words of outlined text, one clear subject, and contrast that survives being shrunk are what matter. The autopsy measures a YouTube thumbnail at 168, 246 and 360 pixels wide and reports edge energy, contrast and badge collisions rather than predicting clicks; the contrast checker works for any of them.
Keep going without re-uploading — your image carries over to the next tool automatically.