Thumbnail Image Resizer
Resize images to the exact dimensions required by YouTube, Instagram, TikTok, Facebook, X (Twitter), LinkedIn, and Pinterest.
How it works
How to use the thumbnail image resizer
Upload any image, select a platform and size preset, and download the resized version in seconds. No account, no server upload, no watermarks.
Upload your image
Drag and drop or click to select a JPG, PNG, or WebP file up to 25 MB. The tool shows a preview with your file name, dimensions, and size so you can confirm the right image is loaded.
Pick a platform and size
Select from 7 platforms and 24 size presets covering thumbnails, profile photos, banners, feed posts, stories, and covers. Or enter custom dimensions up to 7680 x 7680 pixels.
Choose resize mode and format
Fill mode crops to cover the target dimensions. Fit mode letterboxes to preserve the full image. Export as JPG (0.92 quality) or PNG (lossless).
Preview and download
See the resized result with exact output dimensions before downloading. Your source image stays loaded so you can resize to multiple sizes without re-uploading.
FEATURES
Thumbnail image resizer features
Resize images to exact platform dimensions with 24 presets, two resize modes, and JPG/PNG export. Runs entirely in your browser.
24 platform size presets
Pre-configured dimensions for YouTube (thumbnail, banner, profile), Instagram (square, vertical, landscape, story, profile), TikTok (cover, profile, carousel), Facebook (feed, story, cover, profile), X/Twitter (in-stream, profile, header), LinkedIn (post, square, cover), and Pinterest (pin).
Fill and Fit resize modes
Fill mode crops your image to completely cover the target dimensions with no empty space. Fit mode scales the image to fit inside the target while preserving the full composition, adding letterbox or pillarbox padding where needed.
100% browser-based processing
All resizing happens locally using the HTML5 Canvas API. Your images are never sent to a server, the tool works offline after the page loads, and your files stay completely private.
Custom dimensions
Enter any width and height up to 7680 pixels for sizes not covered by the presets. Useful for email headers, blog images, ad creatives, and other non-standard formats.
JPG and PNG export
Choose JPG at 0.92 quality for smaller file sizes with minimal visible loss, or PNG for lossless output that preserves transparency and sharp edges on text and graphics.
Drag-and-drop upload
Drop an image directly onto the upload zone or click to browse. Accepts JPG, PNG, and WebP files up to 25 MB. Large images are automatically downsampled to prevent browser memory issues.
Live preview
See the resized output on a live canvas before downloading. The preview displays the exact pixel dimensions and file format so you know what you are getting.
Multi-size workflow
Your source image stays loaded between resizes. Select a different platform or preset, and the tool generates a new output instantly. Download as many sizes as you need from a single upload.
Why creators use this thumbnail image resizer
Built for creators who publish across multiple platforms and need correctly sized images without opening Photoshop or Canva.
Get exact platform dimensions
Each platform has specific size requirements. Wrong dimensions cause cropping, blurriness, or poor display. This tool gives you the exact pixels every platform expects, with no guessing.
Keep unreleased content private
Unlike web-based resizers that upload your files to a server, this tool processes everything in your browser. Your unreleased thumbnails, unpublished content, and personal images never leave your device.
Resize once, publish everywhere
Instead of manually calculating dimensions and cropping in an editor, pick a platform, pick a size, and download. Resize the same image for five platforms in under a minute.
Frequently asked questions
What is a good YouTube thumbnail size?
Use 1280x720 pixels in a 16:9 ratio. Keep the file under YouTube's upload limits and verify readability at small sizes.
How can I test if my thumbnail stands out?
Load competitors with a keyword or channel, switch to the same context your audience sees, and use Stand Out mode to run a quick visual isolation test.
Can I compare multiple thumbnail options?
Yes. Upload multiple variants in Setup and click each one to instantly update preview, score, and suggestions.
Does this work for mobile YouTube viewers?
Yes. Toggle to mobile preview and review how thumbnails and text hold up at smaller feed sizes.
What should I improve first for higher CTR?
Start with the weakest metric in the analysis panel. Most creators see the fastest gains by fixing text readability and contrast first.
What's the best font size for thumbnails?
Large enough to read at mobile size. Test by viewing your thumbnail at small scale before downloading.
Stop losing views to mediocre thumbnails
Generate studio-quality thumbnails that stop scrolling and drive clicks in seconds. No design skills needed.
+50% average CTR increase
2× faster production speed
90% reduction in design cost
