Add a Brand Name to Video
Use a text watermark to place a company, channel or creator name over the picture. Adjust the text color, background color and opacity so it remains readable without unnecessarily covering the underlying content.
Media Tools
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Free Online Tool
Free Video Watermark Tool – Add Text or Image Watermarks
Add a text or image watermark to video online. Adjust position, size, colors and opacity, preview the placement, and create a watermarked MP4 in your browser.
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Browser-Based
Online Tool
Free Video Watermark Tool – Add Text or Image Watermarks
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Upload a video to start watermarking.
Watermarking Video
Online Video Watermark Tool
Add a Watermark to Video Online
Add a visible text or image watermark to a video without building a full editing project. CyberTools lets you upload a supported video, choose either a text watermark or an image such as a logo, control its appearance, drag it directly across the preview and render the result as a new MP4. Text watermarks support custom text color, background color, font size, text opacity and background opacity. Image watermarks support adjustable scale and opacity. Placement is stored as a percentage of the video stage, allowing the overlay to follow the selected relative position when FFmpeg renders the output. The current implementation runs its main FFmpeg workflow through WebAssembly in the browser. Text watermarks are first drawn onto a transparent PNG canvas and then overlaid on the video. Image watermarks are loaded directly, scaled, converted to an RGBA representation and given an adjustable alpha value before being overlaid. Because a visual filter is applied to the video, the video stream must be rendered again rather than simply copied bit for bit. The current command requests direct audio stream copying with `-c:a copy`, so compatible source audio can pass through without a separate audio re-encode.
Text Watermark
Image Watermark
Drag Positioning
Opacity Control
Logo Scaling
MP4 Output
Browser Processing
Quick Answer
How do I add a watermark to a video online?
Upload a supported video, choose Text or Image, customize the watermark, drag it to the desired position on the preview and start rendering. For text, CyberTools creates a PNG layer from your chosen text, colors, font size and opacity. For an uploaded image, FFmpeg scales the image and applies the selected alpha level. The watermark is then positioned using the selected horizontal and vertical percentages and overlaid on the video. The result is read from FFmpeg as an MP4 and made available for preview and download.
Common Uses
Common Video Watermarking Tasks
A watermark is useful when a visible identifier, attribution or branding element needs to stay on top of the picture for the duration of the rendered video. The tool applies one persistent overlay rather than keyframed or animated watermark movements.
Add a Logo Watermark
Upload a PNG or JPG logo and position it in a corner, along an edge or elsewhere in the frame. The image can be scaled and its opacity reduced before rendering.
Mark Preview or Review Footage
Place text such as SAMPLE, PREVIEW, DRAFT or REVIEW over footage when you need an obvious visual status marker before distributing the final version.
Add Copyright Attribution
Add creator or copyright text to footage before sharing it. A watermark can communicate authorship or ownership, although it does not technically prevent copying or removal.
Create Social Media Branding
Keep a small logo, handle or brand name visible while clips are reposted across social platforms. A modest size and partially transparent appearance can preserve more of the original picture.
Place a Persistent Identifier
Use a static watermark when a project name, account name, organization identifier or source label should remain visible throughout the rendered video.
Watermark Comparison
Text vs Image Watermarks for Video
Text and image watermarks use different preparation paths in the current implementation. A text watermark is drawn by the browser onto a PNG canvas before FFmpeg receives it. An image watermark uses your uploaded image directly and FFmpeg applies scaling and alpha adjustment. Both are eventually passed to the FFmpeg overlay filter and positioned relative to the main video frame.
| Watermark Type | Main Controls | How It Is Prepared | Best Fit |
|---|---|---|---|
| Text | Text, color, background, font size, opacity | Rendered into a PNG canvas first | Names, copyright text, status labels and short identifiers |
| PNG logo | Scale and opacity | Loaded as image, scaled and converted to RGBA | Logos with transparent backgrounds |
| JPG image | Scale and opacity | Loaded as image then processed by FFmpeg | Simple rectangular branding graphics |
| High-opacity watermark | Opacity near the upper range | More visually prominent overlay | Strong branding or visible review markers |
| Low-opacity watermark | Reduced alpha | More of the underlying picture remains visible | Subtle logos and persistent attribution |
| Corner placement | Drag position toward an edge or corner | Converted into percentage-based overlay coordinates | Branding that should cover less of the main subject |
How It Works
How CyberTools Applies a Video Watermark
The current workflow uses one video input and one generated or uploaded watermark input. The browser stores the source video in the FFmpeg virtual filesystem. Depending on the selected watermark type, CyberTools either creates a transparent text image or loads the chosen image file. FFmpeg then constructs an overlay filter whose coordinates are calculated from the selected percentage position. The final filtered video is written to `output.mp4`, read back from FFmpeg memory and exposed through a browser object URL.
1
Load the Source Video
The selected video is read by the browser and written into the FFmpeg WebAssembly virtual filesystem before processing begins.
2
Create the Text Layer
For text mode, CyberTools creates a browser canvas, draws the chosen background with its opacity, draws the text using the selected text color and opacity, converts the result to PNG and writes that PNG into FFmpeg.
3
Prepare an Image Watermark
For image mode, the uploaded image is written to FFmpeg and passed through scale, RGBA formatting and `colorchannelmixer` so the selected image opacity becomes its alpha value.
4
Calculate Watermark Position
The interface stores horizontal and vertical position as percentages. FFmpeg calculates the overlay center using the main video width and height and offsets by half of the watermark width and height.
5
Apply the Overlay Filter
The prepared watermark stream and original video stream are combined with FFmpeg `overlay`, creating a filtered video containing the visible text or image layer.
6
Create the MP4 Result
The current command writes the filtered result as `output.mp4` and requests `-c:a copy` for the audio stream. The completed file is then read from FFmpeg memory and made available for preview and download.
Placement and Appearance
What Watermark Position, Size and Opacity Should You Use?
The best settings depend on whether the watermark is primarily decorative branding, attribution or a strong review marker. A watermark that is too small can disappear on mobile screens, while one that is too large or opaque can hide important visual information. Preview the position against the actual video content rather than choosing settings only by numerical value.
Small brand logo
Corner placement with moderate scale
A corner generally preserves more of the main subject while keeping the brand visible.
Subtle attribution
Reduced opacity
Lower alpha keeps the identifier present while allowing more of the underlying picture to remain visible.
Strong copyright notice
Readable text with higher opacity
Higher visual contrast makes attribution harder to miss, especially against changing backgrounds.
Text over complex footage
Use a background color with partial background opacity
A semi-transparent background can improve readability when the video contains changing colors and detail.
Transparent logo artwork
PNG image watermark
PNG is usually the more suitable choice when the logo itself contains transparency around its shape.
Preview or draft marker
Larger central or near-central text
A larger, prominent marker communicates draft status more clearly than a small corner logo.
Quality and Rendering
How Watermarking Affects Video Quality and Audio
Adding a visible overlay requires FFmpeg to filter the video frames. Once the picture has been filtered, the video cannot remain a bit-for-bit copy of the original compressed video stream because new visual pixels have been introduced. The inspected implementation does not explicitly set a video codec in its final command, so the exact video encoder selected depends on the available FFmpeg build and the MP4 output requirements. The audio path is different: the command explicitly requests `-c:a copy`, meaning FFmpeg attempts to copy a compatible source audio stream without re-encoding it.
Watermarked Video Must Be Rendered Again
The overlay changes video frames, so the visual stream is processed and encoded into the new MP4 rather than copied unchanged.
The Tool Does Not Explicitly Select a Video Codec
The current command uses the filtered video output without a hard-coded `-c:v` option. The FFmpeg build therefore determines an appropriate video encoder for the MP4 output.
Audio Is Requested as a Stream Copy
The command includes `-c:a copy`, so compatible audio can remain in its original encoded form instead of going through a separate audio re-encode.
Text Is Rasterized Before Overlay
Text is converted into pixels on a PNG canvas before being passed to FFmpeg, so the rendered result contains a visual image of the text rather than editable text metadata.
Image Opacity Changes Alpha
For image watermarks the current FFmpeg filter converts the image to RGBA and applies the chosen alpha value with `colorchannelmixer`.
Watermarking Cannot Improve Weak Source Video
Adding a watermark does not restore missing detail, increase genuine source resolution, repair compression artifacts or enhance low-quality footage.
Processing and Privacy
Where Is Your Video Processed?
The inspected CyberTools Video Watermarker loads FFmpeg WebAssembly in the browser and writes the selected source video and watermark assets into FFmpeg’s virtual filesystem during processing. The finished MP4 is read back from FFmpeg memory and exposed through a browser object URL. This architecture keeps the main watermark-rendering workflow on the user’s device rather than requiring the video to be sent to a separate conversion service for the FFmpeg operation itself.
- The selected video is written into the browser-side FFmpeg virtual filesystem before rendering.
- Generated text PNGs or uploaded image watermarks are also written into the FFmpeg virtual filesystem for the overlay operation.
- Rendering uses the device CPU and memory, so performance depends on video size, duration, browser capabilities and available resources.
- The completed MP4 is read from FFmpeg memory and provided to the page through a browser object URL for preview and download.
Important Limitations
What an Online Video Watermarker Cannot Do
A watermark is a visible overlay, not a complete digital-rights-management system or advanced compositing editor. The current tool focuses on applying one persistent text or image overlay to a video and does not provide complex animation, tracking or timeline-based watermark automation.
- A visible watermark does not technically prevent someone from cropping, covering or attempting to remove it.
- The current watermark remains static in its chosen relative position rather than following a moving person or object.
- The tool does not create animated logos, keyframed opacity changes, motion paths or timed watermark entrances and exits.
- Only one selected watermark mode is applied at a time; the current interface is not a multilayer graphics compositor.
- Watermarking does not restore lost video detail, repair corrupted footage, remove noise or perform AI enhancement.
- Very large, long or codec-heavy videos can exceed practical browser memory or processing limits during FFmpeg rendering.
Watermark Concepts
Video Watermarks, Alpha, FFmpeg Overlay and MP4 Explained
Understanding these terms helps explain what the tool is actually doing to the video. A watermark is ultimately another visual layer composited over each processed frame, and the final video has to contain those changed pixels.
- Video watermark
- A visible text or graphic layer placed over a video to show branding, attribution, ownership, status or another persistent identifier.
- Overlay
- An FFmpeg video filter that composites one visual stream over another at calculated x and y coordinates.
- Alpha
- The transparency value of a visual layer. Lower alpha makes the watermark more transparent while higher alpha makes it more opaque.
- RGBA
- A pixel representation containing red, green, blue and alpha channels. The image watermark path uses RGBA before applying adjustable transparency.
- colorchannelmixer
- The FFmpeg filter used by the current image-watermark path to modify the alpha channel according to the selected opacity.
- Percentage positioning
- A placement method where horizontal and vertical watermark position are stored relative to the dimensions of the preview and then applied proportionally to the video frame.
- Canvas
- A browser drawing surface used here to rasterize text, background color and opacity into a PNG watermark image before FFmpeg processing.
- PNG
- An image format capable of transparency and used internally by the text-watermark workflow to pass the rendered text layer into FFmpeg.
- MP4
- The output container currently used by the Video Watermarker for the completed watermarked video.
- FFmpeg WebAssembly
- A browser-compatible FFmpeg build that allows media decoding, filtering, compositing and output generation to run within the web page.
Frequently Asked Questions
Video Watermarker FAQ
Answers about text and image watermarks, position, opacity, logos, audio, MP4 output, FFmpeg processing and browser resource limits.
How do I add a text watermark to a video?
Upload the video, select Text, enter the watermark text, choose the text and background colors, adjust font size and opacity, drag the watermark into position and render the result.
Can I add a logo watermark to a video?
Yes. Select Image, upload a supported image such as PNG or JPG, adjust the scale and opacity, position the image on the preview and start rendering.
Can I change the watermark position?
Yes. The interface allows drag positioning on the video preview. The selected horizontal and vertical locations are converted into percentage-based FFmpeg overlay coordinates.
Can I make a watermark transparent?
Yes. Text mode includes text and background opacity controls. Image mode includes an opacity control that the current FFmpeg filter applies to the image alpha channel.
Does adding a watermark reduce video quality?
The video frames must be filtered and rendered again because the overlay changes the picture. The result therefore cannot be a bit-for-bit copy of the original compressed video stream.
Does the tool re-encode the audio?
The current command requests `-c:a copy`, which tells FFmpeg to copy a compatible source audio stream rather than intentionally re-encode it.
What video format does the tool create?
The current implementation writes the completed result as an MP4 file named `output.mp4` inside the FFmpeg workflow.
Is my video uploaded to a conversion server?
The inspected main rendering workflow runs with FFmpeg WebAssembly in the browser. The selected video and watermark assets are written into FFmpeg’s browser-side virtual filesystem during processing.
Why can a large video fail while watermarking?
Video decoding, overlay filtering and output rendering require device memory and CPU. Very large, long or demanding files can exceed practical browser or device resources.
Can this tool automatically track a moving object with the watermark?
No. The current implementation applies one persistent watermark at a selected relative position. It does not perform object tracking or keyframed watermark motion.
Add text, logos or image watermarks to videos online. Drag the watermark into position, adjust text colors, background, font size, image scale and opacity, then process the video in your browser with FFmpeg WebAssembly.
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