NEW · FFmpeg.wasm · 100% Browser-Based

Free Video Watermark Tool

Add text or image watermarks to videos — position, opacity, size, font controls. Browser-based, no upload, no signup, no watermark on the tool itself.

🎬
Drop a video file
MP4 · MOV · WebM · MKV · AVI · GIF
Files stay on your device · Never uploaded

Why Do This in Your Browser?

Adding a watermark to a video — a logo, channel name, copyright line, or simple text caption — is one of the most basic post-production tasks. Almost every online tool that does this for free imposes its own watermark on the output as upsell pressure for paid plans. The contradiction is so common it's almost funny: 'add your watermark for free, plus our watermark.'

This tool doesn't do that. Add text (with font, color, size, position, and opacity controls) or upload an image (PNG with transparency works well for logos), preview the placement on the source video, export. The output is exactly your video with exactly your watermark — no UDT mark, no Powered-By footer.

How It Works

Text watermarks use FFmpeg's `drawtext` filter, which rasterizes text using a built-in font and overlays it on every frame. You control font family (DM Sans, Chakra Petch, JetBrains Mono, or default system serif), size, color, opacity (0–100%), background box (optional), and position (9-point grid: top/center/bottom × left/center/right).

Image watermarks use the `overlay` filter to composite an uploaded PNG/SVG over the video. Transparent PNGs blend naturally; opaque images get an opacity slider. Position is the same 9-point grid as text. Common watermark spec: 5–10% of video width, semi-transparent, positioned in a corner. The tool defaults to those values; tweak as needed.

Tip: Resize for the target platform first with the Video Resizer, then watermark — sizing the watermark to a 9:16 vertical is different from sizing it to a 16:9 horizontal. After watermarking, shrink to platform size limits with the Video Compressor.

Common Use Cases

Channel Branding
Permanent channel logo in the corner of every video you publish.
Copyright Notice
© Name 2026 along the bottom of original content.
Caption / Subtitle Overlay
Single-line captions burned into the video for platforms that don't support sidecar captions.
Watermark Original Work
Mark proofs and previews with 'PROOF — DO NOT REDISTRIBUTE' before client review.
Tutorial Annotations
Add tool URLs or shortcut text directly onto recorded tutorials.
Discord/Slack Reactions
Add a one-word reaction text to a video reaction GIF/MP4.

How We Compare

Honest read on free, paid, and self-hosted options for this kind of job:

UDT Video Watermark (this tool): Free, browser-based, text and image watermarks. No upload, no UDT-imposed watermark. (We are very aware of the irony.)
Clideo Add Watermark: Free tier adds its own watermark to your output. $9/mo to remove it. Cloud.
Kapwing Watermark: Free tier 4-min limit + watermark on output. $16/mo. Cloud.
VEED Watermark: Free tier 720p cap + watermark. $12–$30/mo. Cloud.
Adobe Premiere title tool: Industry-standard, full creative control — requires Premiere subscription. Overkill for a single static watermark.
FFmpeg drawtext + overlay: Free, runs locally — same operation. CLI required. This tool wraps it with live preview.

Frequently Asked Questions

Does this tool add its own watermark to the output?
No. The output is exactly your video plus exactly your chosen watermark. No 'Made with UDT' footer, no quality cap, no nag — we know how annoying that is, which is why we don't do it.
Will the watermark be re-encoded into the video?
Yes — watermarking requires drawing on every frame, so the video stream is re-encoded at CRF 23. Quality is visually identical to source for most content.
What text formatting options are available?
Font family (4 built-in plus system fallback), size (10–200px), color (full color picker), opacity (0–100%), optional background box with its own color and opacity, 9-point position grid plus pixel-level offset within each grid cell.
Are my videos uploaded anywhere?
No. Watermarking runs entirely in your browser via FFmpeg.wasm. The 32MB engine downloads once and caches.
What's the best watermark spec?
For corner branding: 5–10% of video width, 40–60% opacity, positioned with 20–30px margin from the edges. For copyright notices: bottom-center, full opacity, dark background box for readability over varied content.
Can I use a PNG with transparency for the watermark?
Yes — PNG transparency is preserved through the overlay. SVG also works (rasterized at the target size). Recommended logo size is 200–400px wide source PNG, then scaled down to ~10% of video width by the tool.
Can I add multiple watermarks?
Currently one text + one image per export. For multi-element watermarks, layer through multiple passes of the tool, or use a proper NLE.
Will the watermark cover important content?
The preview shows watermark position over the first frame of the source. Scrub through to verify nothing important sits under the watermark zone before exporting.

Related Tools on UDT

Video Resizer →
Resize videos to 9:16 vertical, 1:1 square, or any custom aspect ratio.
Video Compressor →
Shrink video files with platform presets — WhatsApp 16MB, Discord 10MB, Gmail 25MB, IG Reels 4GB, Ti…
Video Converter →
Convert between MP4, MOV, WebM, MKV, AVI, and GIF entirely in your browser.
All Video Tools →
Browse the full Video Suite — 12 tools, all in-browser.