Lite Tools

Image Watermark

Add a custom text watermark to images online with adjustable position, size, color and opacity. Composed and previewed locally to protect your work.

Click to select or drag an image here One image at a time · PNG, JPG, WebP · up to 30MB

How to use

  1. Drag an image onto the dashed area or click it to pick a local file. PNG, JPG and WebP are supported, up to 30MB.
  2. Type the watermark text and choose a position: top left, top center, top right, center, bottom left, bottom center or bottom right.
  3. Drag the "Font size" and "Opacity" sliders and pick a color to fine-tune the look. Oversized text shrinks automatically to stay on a single line.
  4. Click "Preview watermark" to see the composition; afterwards any parameter change refreshes the preview automatically.
  5. When satisfied, click "Download image" to save the result. JPG output is automatically placed on a white background.

FAQ

Does the watermark embed hidden information?
This tool adds a visible text watermark to clearly mark copyright or source. For invisible steganographic watermarks used to trace leaked copies, a dedicated service is required.
What is the difference between JPG and PNG output?
JPG is smaller and broadly compatible but does not support transparency: transparent areas are filled white. PNG is lossless and keeps transparency but is usually larger. The output format follows the original image.
What if my watermark text is too long?
The text is kept on one line and the font shrinks automatically until the whole string fits within the image width, avoiding broken layouts. You can also shorten the text or lower the font size manually.
Is my image uploaded to a server?
No. Everything is composed locally on a Canvas in your browser: neither the original nor the finished image ever leaves your device.

How to use

  1. Load the image

    Drop a PNG, JPG or WebP picture into the dashed zone or click to browse, up to 30MB. The hint line shows original dimensions to help you size the mark.

  2. Enter the watermark text

    Type your name, brand or copyright notice into the watermark text box, up to 120 characters. An example is © plus the year and your site name.

  3. Choose a grid position

    The position dropdown offers top left, top center, top right, center, bottom left, bottom center and bottom right. Center placement deters theft; corners stay unobtrusive.

  4. Tune size, color, opacity

    Font size is a percentage of the shorter image edge, adjustable from 1% to 30%. Pick a color, then set opacity. The default 60% is a balanced starting point.

  5. Preview and download

    Click Preview watermark to composite the result; further parameter changes refresh it automatically. When satisfied, press download to save in the source format.

About this tool

A text watermark composites a line of type onto the image canvas, and the output keeps the source format. It uses the chosen font size, color and opacity. Font size is a percentage of the shorter edge, so the mark stays proportional no matter how large the photo is. Overly long text shrinks automatically to fit on one line. Everything runs on an in-browser Canvas and never reaches a server.

It suits photographers, designers, online sellers and content creators. Sign preview images to discourage theft, put brand names on promo graphics, or watermark draft deliverables before sending them to clients. A semi-transparent center mark sharply raises the cost of removal, while a corner mark stays readable without covering the subject. This is a visible watermark for attribution only. Invisible, forensically traceable marks require dedicated services.

How it works

Opacity is alpha compositing: each result pixel equals the text color weighted by alpha plus the background weighted by one minus alpha. The 60% default splits influence evenly between mark and picture, while 30% reads as a faint overlay. Sizing the font as a percentage of the shorter edge keeps the mark proportionally constant. A 15% watermark on a 4000-pixel original still occupies 15% after the picture is resized to 800 pixels for sharing. The signature's relative position and scale survive every downstream edit. A mark over busy textures is harder to erase than one sitting on a flat color field.

Know the limits of visible watermarks. They deter casual reposting, resist little against someone with an inpainting tool, and carry none of the weight of formal registration. Canvas re-encoding also drops EXIF metadata, so the output carries no author, camera or timestamp fields. Any workflow leaning on metadata for provenance should archive the original alongside the watermarked copy. Attribution and evidence then live in separate files, and each file does its own job.

When to use it

  1. Watermarked proofs before delivery

    Send signed watermark previews during the selection stage so clients can confirm composition and color. Hand over clean originals only after payment clears. The proportional mark stays legible on a phone screen, so reviewing is never blocked by it.

  2. Branding widely forwarded product shots

    Product images travel through distributors and repost chains. Placing the brand name bottom-center or bottom-right lets buyers trace the shop from any copy. A font size near 8% of the short edge stays identifiable without crowding the product itself.

  3. Signing shared notes and slides

    Screenshots of study notes and course slides gain a source line before hitting group chats. Reposted copies stay traceable to you. One preview pass to confirm the text misses every chart and formula, and the material is ready to release.

Tips & tricks

  • Use white watermarks on dark images and dark gray on light ones, so the text stays readable everywhere.
  • For theft deterrence, set opacity near 30% and place the mark in the center. It stays subtle yet hard to crop out.
  • Watermarked transparent PNGs keep their alpha. Exporting to JPG fills transparent areas with white instead.

Things to watch

  • A corner mark dies to one crop

    A watermark in the top-left or bottom-right vanishes once that corner is cropped away. Deterrence therefore wants the center. This tool draws a single line of text and does not tile across the picture, so center placement matters more.

  • A watermark is not registration

    Visible marks annotate and deter; they neither survive determined inpainting nor substitute for formal copyright deposit. Treat the watermark as the first line of defense and register the works whose ownership you may need to prove.

  • Output carries no EXIF

    Canvas re-encoding strips capture time, camera model and GPS fields from the file. That quietly breaks provenance workflows that lean on metadata. Archive the watermarked copy together with the untouched original, where the ownership data lives.

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