Yes. The full canvas editor — text, outline, glow, shapes, backgrounds, contrast presets, drag layout, and PNG export — runs entirely in your browser at no cost and with no signup.

Do my images or designs get uploaded anywhere?

No. ThumbForge is 100% client-side. Background images you add and the thumbnails you export never leave your device. There is no server, account, or tracking.

What size are the thumbnails?

The canvas is YouTube's recommended 1280×720 (16:9), and PNG export renders at that full resolution so it's upload-ready.

What does Pro add and do I need an account?

Pro is bring-your-own-key. You paste your own GLM (z.ai) API key and ThumbForge calls the official API directly from your browser to suggest high-CTR titles and short thumbnail-text variants. No ThumbForge account, no proxy, and your key is kept only in the page.

Can I use it on my phone?

Yes, the studio is responsive down to small screens, though a larger screen is best for precise drag layout.

⚡ 1280×720 · client-side · no signup

Forge the thumbnail
they can't scroll past.

A punchy, browser-based thumbnail studio for YouTubers. Bold editable text with outline & glow, shapes, contrast presets, drag-anywhere layout, and one-click PNG export — the whole editor is free and runs entirely on your device.

Open the Studio → ⚡ Unlock AI title ideas

no account · no upload · no watermark · your art stays on your machine

1280 × 720 px

🅣

Outline + glow text

Heavy display type with adjustable stroke and neon glow so words pop off any background.

🎯

Drag layout

Grab, drag, and resize every layer right on the live 1280×720 canvas.

⚡

Contrast presets

One click recolors text and background into proven high-CTR looks.

⬇

Upload-ready PNG

Exports at full YouTube resolution — no watermark, no account.

⚡ PRO · BRING YOUR OWN KEY

AI title & thumbnail-text ideas

Describe your video. ThumbForge calls the GLM API directly from your browser with your own key to brainstorm scroll-stopping titles and the 2–4 word thumbnail text that earns the click — then drops any pick straight onto your canvas.

Your GLM (z.ai) API key

What's the video about?

Vibe

🔑 No key yet? Grab a GLM key (5% off) — that's a referral link that supports ThumbForge. Your key is used only by your browser to call z.ai's official API; it's never sent to us or stored anywhere but this page.

⚡ Your sharpened titles and thumbnail text will appear here.
The free editor on the left works with zero keys.

FAQ

The honest answers.

Is ThumbForge really free?

Yes — the entire canvas editor (text, outline, glow, shapes, backgrounds, presets, drag layout, PNG export) is 100% free and runs in your browser. No signup, no watermark, no limits.

Where do my images and designs go?

Nowhere. There is no server. Background images you add and the PNGs you export never leave your device. ThumbForge has no account system and no tracking.

What does Pro cost?

ThumbForge charges nothing for Pro. It's bring-your-own-key: you paste your own GLM (z.ai) API key and pay z.ai directly for whatever you generate. We provide an optional referral link to get a key (with 5% off) and earn a small commission if you use it.

Is my API key safe?

Your key lives only in the page (in memory, not even saved to disk unless you choose) and is sent only to z.ai's official endpoint over HTTPS. There's no ThumbForge proxy or server in the middle.

What size are the exports?

Full 1280×720 PNG — YouTube's recommended thumbnail size and 16:9 ratio, ready to upload as-is.