UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

Video Watermark Adder

Add text or image watermarks to videos with custom position, font size, colour, and opacity. Runs entirely in your browser.

About Video Watermark Adder

Video Watermark Adder burns a text or image watermark directly into any MP4, WebM or MOV video inside your browser using ffmpeg.wasm — your video is never uploaded to a server. For text watermarks, choose the label, font size, hex colour and opacity, then pick one of nine position anchors (top-left, top-center, top-right, mid-left, mid-center, mid-right, bottom-left, bottom-center, bottom-right). For image watermarks, upload a PNG, WebP or JPG logo and control its opacity and position the same way. The tool uses ffmpeg's drawtext and overlay filters for precise, production-quality results.

Why use Video Watermark Adder

  • 100% private — video never leaves your device
  • Text and image watermark modes
  • 9 position anchors for precise placement
  • Full control over size, colour, and opacity
  • No watermark on the tool output (ironic but true)
  • No signup, no upload, completely free

How to use Video Watermark Adder

  1. Upload your video file (MP4, WebM, or MOV).
  2. Choose 'Text Watermark' or 'Image Watermark' using the tab buttons.
  3. For text: enter your watermark text, choose font size, colour and opacity.
  4. For image: upload a PNG or WebP logo and set its opacity.
  5. Click one of the 9 position buttons to place the watermark.
  6. Click 'Add Watermark' and wait for processing.
  7. Preview the watermarked video and download.

When to use Video Watermark Adder

  • Branding recorded videos before publishing to social media
  • Adding copyright notices to original video content
  • Placing a logo bug in the corner of tutorial recordings
  • Watermarking client preview videos before final delivery
  • Adding a discreet attribution mark to portfolio reels
  • Stamping draft cuts with a 'PREVIEW' label so they are not mistaken for finals

Examples

Logo bug in bottom-right corner

Input: 3-min MP4 tutorial, PNG logo (transparent), opacity 0.8, bottom-right position

Output: Watermarked MP4 with brand logo subtly anchored to the bottom-right of every frame

Copyright text overlay

Input: 30-sec WebM clip, text '© YourBrand 2026', font size 36, white, opacity 0.7, bottom-center

Output: WebM with a clean white copyright line centred along the bottom edge

Draft preview marker

Input: 5-min MOV cut, text 'PREVIEW – DO NOT SHARE', red, opacity 0.5, mid-center

Output: MOV with a translucent red 'PREVIEW' watermark across the middle of every frame

Tips

  • Use 60–80% opacity (0.6–0.8) so the watermark is visible without dominating the frame.
  • Place the watermark at bottom-right for the most professional, broadcast-style look — viewers expect it there.
  • PNG logos with a transparent background look dramatically cleaner than JPEG logos with white squares around them.
  • For dark videos, use white text; for bright/outdoor footage, use a black or dark grey watermark for contrast.
  • Keep watermark text short (5–15 characters) — long strings get hard to read at small sizes.
  • If you need a different watermark per segment, trim each segment first with the Video Trimmer, then watermark and concatenate.

Frequently Asked Questions

Does my video leave my device?▾
No, processing is 100% local in your browser. Your video is never uploaded to any server.
What image formats are supported for the overlay?▾
PNG, WebP and JPEG. PNG with transparency works best for logo overlays as the transparent areas are preserved.
Can I adjust the opacity of a text watermark?▾
Yes, the opacity slider goes from fully transparent (0) to fully opaque (1.0). 0.8 is a good default for a visible but non-intrusive watermark.
What font does the text watermark use?▾
ffmpeg.wasm uses its built-in default font for drawtext. Custom font loading is not currently supported in this browser-based tool.
Can I add a watermark to only part of the video?▾
The current tool applies the watermark to the entire video duration. For partial watermarks, trim the video first then apply the watermark to the trimmed segment.
What is the maximum video file size?▾
There is no hard limit imposed by the tool, but very large files (over 1GB) may be slow to process in-browser and may require significant RAM.
Why does it need SharedArrayBuffer / Chrome or Edge?▾
ffmpeg.wasm uses SharedArrayBuffer for multi-threaded encoding. It works in Chromium-based browsers (Chrome, Edge, Brave, Arc) on cross-origin-isolated pages.
Will the watermark stay sharp at lower resolutions?▾
Yes — both drawtext and overlay are resolution-aware. The watermark scales appropriately and stays crisp on the encoded output.

Explore the category

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Glossary

ffmpeg.wasm
WebAssembly build of FFmpeg used to run the watermark encode entirely in the browser tab.
SharedArrayBuffer
Multi-threading shared memory required by ffmpeg.wasm. Available only on cross-origin-isolated (COOP/COEP) pages.
drawtext filter
FFmpeg video filter that renders text directly onto each frame using the built-in font and chosen colour/opacity.
overlay filter
FFmpeg video filter that composites a second image (your logo) on top of the main video at chosen coordinates.
Codec
The compression algorithm used in the output (H.264 for MP4, VP9 for WebM). The tool re-encodes the watermarked video.
Container format
The MP4/WebM/MOV wrapper containing the encoded video and audio. Output container matches the input.
Alpha channel
The transparency information in PNG/WebP images. Preserved by the overlay filter so logos don't end up with white boxes.
Bitrate
Bits per second the encoder spends on the video. Watermarking re-encodes, so the output bitrate may differ from the input.