Tiny Online Tools logoTiny Online ToolssearchSearch tools…grid_viewAll Tools
Homechevron_rightImage Toolschevron_rightThumbnail MakerThumbnail Maker

Thumbnail Maker

Create image thumbnails at preset social media sizes or custom dimensions. Cover or contain fit, runs entirely in your browser.

upload_file

Click to browse or drag & drop files here

Select an image

Accepted: image/*

Similar Tools

G-code Thumbnail Extractor

G-code Thumbnail Extractor

Pull the preview images a slicer embedded in a G-code file back out, view them, and save them as PNG or JPEG.

Image Grid Maker

Image Grid Maker

Arrange multiple images into a single grid layout.

Pixelate Image

Pixelate Image

Pixelate any image to create a retro 8-bit style or to redact sensitive content. Adjustable block size, runs entirely in your browser.

Image Caption Generator

Image Caption Generator

Add a clean caption strip below any image. Custom font size, color, background, and padding. Fully private, runs in your browser.

Tone Generator

Tone Generator

Generate sine, square, sawtooth, and triangle audio tones from 20 Hz to 20 kHz directly in your browser. Adjustable volume.

Text Encoding Converter

Text Encoding Converter

Convert text into UTF-8 byte hex, Base64, or percent-encoded output.

Random Date Generator

Random Date Generator

Generate random dates within a specified range with options for count, format, and time.

apps

More Tools

Browse our full collection of free online tools.

Thumbnail Maker

Generate perfectly sized thumbnails for the major social media platforms or any custom size. Pick a preset for YouTube, Instagram, TikTok, Twitter, Facebook, or Pinterest, or enter your own dimensions.

Fit modes

  • Cover crops the image to fill the target dimensions exactly. Best for hero thumbnails where edges don't matter.
  • Contain scales the image to fit inside the target dimensions, with a colored letterbox/pillarbox around the leftover space.

Features

  • One-click presets for all major platforms
  • Custom width and height up to 4096 px
  • Choice of cover or contain fit
  • Configurable background for contain mode
  • High-quality image smoothing
  • Outputs PNG

Tips

For YouTube thumbnails, 1280×720 is the standard. Instagram now accepts both square (1080×1080) and 4:5 portrait (1080×1350). For best results, start from a higher-resolution source than the target.