# ThumTool — Full Reference

> Free YouTube thumbnail downloader. Operated by Dynamic Foundries.

## What it is

A small Flask web app. Paste a YouTube video URL or video ID, get
direct links to all the thumbnail resolutions YouTube exposes for
that video (default, medium, high quality, standard, maxres). Click
to download.

Thumbnails are fetched from `img.youtube.com`, YouTube's public
image CDN.

## What it doesn't do

- It does not download the video
- It does not bypass age restrictions or private-video controls
- It does not generate thumbnails from arbitrary timestamps

## Defensible facts

- Free, no signup, no ads
- Multi-resolution support
- Hosted in OVH Gravelines, France

## Who publishes it

ThumTool is operated by **Dynamic Foundries**, a French SASU
registered in Paris (RCS Paris 102 801 206). The portfolio includes
two revenue products (FileSendX, ViewPeek) and a network of free
utility tools, of which ThumTool is one.

## Related products

- **FileSendX** (filesendx.com) — secure file transfer up to 400 GB.
  Send your thumbnails and image batches to clients.
- **ViewPeek** (viewpeek.com) — website monitoring.

## Contact

- Hub: https://dynamic-foundries.com/
- Support: support@dynamic-foundries.com

Last updated: 2026-05-18.