YouTube Thumbnail Generator

Pick a video frame, crop it to a 16:9 thumbnail, add a bold outlined headline and accent bar, then download a PNG. Runs locally in your browser.

About this tool

This thumbnail generator turns a single frame from a video into a ready-to-share PNG. Choose the timestamp, crop the frame to a target canvas (1280×720 by default), add a large outlined headline, and optionally draw a bright accent bar on one edge.

The tool is designed for demo videos, explainers, launch clips, course lessons, and README previews where you need a clear still image without opening a full design app. It runs the video processing locally through ffmpeg in your browser and downloads a PNG.

Example

Upload a short video, set Frame time to 1, enter this headline:

BIG IDEA IN 10 MINUTES

Keep the default 1280 × 720 canvas, headline position Bottom, white text, black outline, and a yellow bottom accent bar. The output is a PNG thumbnail whose source frame is center-cropped to 16:9, with the headline drawn from a bundled bold font.

Limits and edge cases

Output is a single PNG image. It does not upload to any platform or create a video.
The frame is scaled and center-cropped to the requested canvas; use a 16:9 size such as 1280 × 720 for typical video thumbnails.
The headline is capped at 120 characters. Short punchy text works best.
Colors accept common CSS color names or hex values like #ffcc00 and #fc0.
Text wrapping is not automatic. Add a shorter headline if it overflows the canvas.

FAQ

Does this make an actual YouTube upload thumbnail?

It creates a PNG image with the usual thumbnail shape and styling controls. You can then upload that PNG wherever you need it. The tool does not connect to any account, platform, API, or publishing workflow.

How do I choose the best frame?

Use Frame time (seconds) to seek into the video and grab a still frame. Try a few seconds where the subject is clear, motion blur is low, and there is enough empty space for the headline. The output updates when you run the tool again.

Why is my headline cut off?

The headline is drawn as one line. Reduce Font size, shorten the text, move it to a different position, or make the canvas wider. This keeps the tool deterministic and avoids surprising automatic line breaks.

Can I remove the accent bar?

Yes. Set Accent bar position to none or set the bar thickness to 0. The headline and outline still render normally.

Developer & Automation Access

Run it from the terminal

Same engine as this page, headless — via the gizza CLI:

gizza tool youtube-thumbnail-generator 'url=https://example.com/input' 'headline=BIG IDEA IN 10 MINUTES' 'timestamp=1.0' 'width=1280' 'height=720' 'text_position=bottom' 'font_size=96' 'text_color=#ffffff' 'outline_color=#000000' 'accent_color=#ffcc00' 'accent_position=bottom' 'accent_size=22'

New to the CLI? Get gizza →

Open it by URL

Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:

https://gizza.ai/tools/youtube-thumbnail-generator/?url=https://example.com/input&headline=BIG%20IDEA%20IN%2010%20MINUTES&timestamp=1.0&width=1280&height=720&text_position=bottom&font_size=96&text_color=%23ffffff&outline_color=%23000000&accent_color=%23ffcc00&accent_position=bottom&accent_size=22

Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.