Free social media thumbnail generator (Thumbnail Resizer)
Get the perfect thumbnail for any platform with just one click.
Supports the officially recommended sizes for 10 platforms: Instagram, YouTube, TikTok, X, Facebook, LinkedIn, Pinterest, Reddit, Xiaohongshu, and Lemon8. Drag and drop to upload → Automatic trimming → Instant download.
Online Tools
You can use the tool below as is. No installation is required, and you don't need to leave this page. Simply select your platform and size, upload your image, and download it. All image processing is completed within your browser and is never uploaded to a server.
Features and Benefits of Thumbnail Creation Tools
This tool, "Thumbnail Image Resizer," is an online tool that allows you to easily generate thumbnail images for social media and video platforms in the correct size. It supports a total of 10 platforms: Instagram, YouTube, TikTok, X (Twitter), Facebook, LinkedIn, Pinterest, Reddit, Xiaohongshu, and Lemon8, and comes pre-loaded with the official sizes recommended by each service. Simply select the platform from the tabs, choose the desired size (e.g., YouTube 1280x720), and upload your image. The tool automatically performs proportional cropping using the "cover" method, centered on the image, to generate a thumbnail that fits perfectly within the frame. It consistently supports various aspect ratios, including square, portrait, landscape, and vertical for stories. Furthermore, you can freely specify any width and height in the "Custom Size" input field for each platform, allowing for flexible handling of special dimensions not included in the official list.
The most distinctive feature is that all processing is completed within your browser (frontend). Uploaded images are never sent to external servers, ensuring strong privacy and data security. No installation or registration is required, and you can edit and download on the spot without leaving the page. Output formats can be selected from JPG, PNG, and WebP, and the image quality (e.g., 92%) can be adjusted for JPG and WebP, allowing you to obtain thumbnails with high quality while keeping file sizes small. It is completely free with no usage limits and uses a responsive design that works flawlessly on PCs, tablets, and smartphones. With intuitive operation, anyone can create professional-quality thumbnails in seconds, greatly improving the efficiency of social media management.
List of compatible platforms and sizes
| platform | Size Name | pixel | ratio |
|---|---|---|---|
| YouTube | Video thumbnail / Channel banner / Profile picture | 1280×720 · 2560×1440 · 800×800 | 16:9 · 16:9 · 1:1 |
| TikTok | Video cover / Profile picture / Carousel | 1080×1920 · 200×200 · 1080×1920 | 9:16 · 1:1 · 9:16 |
| Feed posts (square) / Vertical / Horizontal / Stories & Reels / Profile pictures | 1080×1080 · 1350 · 566 · 1920 · 320 | 1:1 · 4:5 · 1.91:1 · 9:16 · 1:1 | |
| Feed posts (horizontal) / vertical / Stories & Reels / Cover photos / Profile pictures | 1080×566 · 1359 · 1920 · 851×315 · 320 | — | |
| X (Twitter) | In-stream (horizontal) / Vertical / Profile picture / Header | 1280×720 · 720×1280 · 400×400 · 1500×500 | — |
| Posts with URLs / Square posts / Cover photos | 1200×627 · 1200×1200 · 1128×191 | — | |
| pin | 1000×1500 | 2:3 | |
| Post/Link Thumbnail / Subreddit Banner / Profile Picture | 1200×628 · 1920×384 · 256×256 | — | |
| Xiao Hongshu | Post cover (3:4) / Square cover / Profile picture | 1242×1660 · 1080×1080 · 200×200 | 3:4 · 1:1 · 1:1 |
| Lemon8 | Post cover (3:4) / Profile picture | 1080×1440 · 200×200 | 3:4 · 1:1 |
* You can also specify any width and height using the "Custom Size" option on each platform.
How to use (3 steps)
- In the tabs at the top Target platform Select one.
- necessary size Select a resolution (e.g., YouTube 1280x720).
- Images Drag or click Upload the image, check the preview, and click "Download Thumbnail".
FAQ
1. Is it a paid service?
It's completely free, and there are no limits on the number of uses.
2. Are the images safe?
Everything is processed on the front end (browser) and is never uploaded to the server.
3. What formats are supported?
Input is supported in JPG, PNG, and WebP formats. Output can be selected from JPG, PNG, and WebP.
4. What if I can't find the size I want?
Each platform has a "custom size" option, allowing you to specify any width and height you like.
5. Does the image become distorted?
Because the "cover" function is used to crop while maintaining the aspect ratio, the final image will be the correct size without distortion.
Related Tools
If you want to process multiple images at once, we also offer tools for image compression, format conversion, and more.