Thumbnail Generator

Resize images to thumbnails. Fast, free, browser-based.

Drop images here or click to upload

PNG, JPG, WebP supported

Settings

Resize images in seconds, right in your browser

Drop your images, pick a size, and download your thumbnails. No uploads to sketchy servers, no waiting. Everything runs locally on your machine. Whether you're preparing images for a website gallery, optimizing assets for an app, or just need quick resizes for social media, this tool handles it without the bloat of traditional image editors.

Built for speed and simplicity

We built this because we needed it ourselves. When creating mockups with our screenshot beautifier, we often needed to batch-resize background images or prepare thumbnails for galleries. Most online tools are either painfully slow, riddled with ads, or require sign-ups for basic features.

This tool also pairs beautifully with our free canvas: create an original mesh gradient design, and import into this thumbnail generator to get a display version for your app.

  • Batch processing — Drag in as many images as you want and process them all at once.
  • Preset sizes & ratios — Common dimensions are one click away, or enter your own custom size.
  • Two resize modes — "Crop" center-crops to fill exact dimensions, "Fit" stretches to match your target size.
  • Multiple formats — Export as WebP (smallest), PNG (lossless), or JPEG (universal).

Common Use Cases

Website Galleries

Create consistent thumbnail sizes for image galleries and product listings.

Social Media

Resize images to platform-specific dimensions for Instagram, Twitter, or LinkedIn.

Email Campaigns

Optimize images for email clients where smaller file sizes improve deliverability.

App Development

Generate multiple sizes of icons and preview images for your applications.

Supported Formats

Upload any common image format (PNG, JPG, WebP, GIF, BMP) and export to:

  • WebP — Best compression with great quality. Recommended for web use.
  • PNG — Lossless format, ideal when you need transparency or pixel-perfect output.
  • JPEG — Universal compatibility, good for photographs.

Tips for Best Results

  • Match aspect ratios — Check the original ratio shown next to each file and select a matching preset to avoid unwanted cropping.
  • Use WebP for web — WebP offers 25-35% smaller file sizes than JPEG at equivalent quality.
  • Quality setting — 80-85% quality is usually indistinguishable from 100% but significantly smaller in file size.
  • Batch similar images — Process images with the same target dimensions together for efficiency.