How to Add a Watermark to an Image
A watermark puts your name, brand or notice directly into the pixels of an image, so anyone who finds the file later can see who made it. It is the simplest way to claim credit for a photo, mark a draft as unfinished or keep a document from being reused silently. Adding one takes seconds — doing it well takes a few decisions about placement and opacity.
What watermarks are for (and what they cannot do)
- Claiming ownership: photographers and designers mark work with their name or studio.
- Marking drafts: sending a proof with DRAFT or PREVIEW across it stops clients from using the unpaid version.
- Branding shared documents: invoices, menus and slides that travel as images stay identified.
- Preventing casual reuse: most people will not strip a visible watermark to repost an image.
Size and opacity that actually work
Two settings decide whether a watermark looks professional: how large the text is and how strong it looks. Placement matters too — a corner keeps the image usable, while text across the middle is reserved for drafts and proofs you must not let anyone reuse.
Watermark text size is measured in pixels of the final image, so the same number looks very different on very different photos. A good rule: aim for roughly 1–2% of the image width. On a 4000-pixel-wide photo that is 40–80 px; on a 1000-pixel image, 10–20 px.
| Use case | Relative size | Opacity |
|---|---|---|
| Portfolio or social photo | About 1% of width | 30–50% |
| Proof or draft preview | 1.5–2% of width | 50–70% |
| Invoice or document image | About 1% of width | 60–80% |
| Strongest visible claim | 2%+ of width | 60–80% |
The Image Watermark tool places bold white text in the bottom-right corner with a soft dark shadow, so it stays readable over both light and dark backgrounds without you having to pick colours. You control the text, its pixel size and its opacity.
Add a watermark step by step
Open the watermark tool
Load the Image Watermark tool and choose the image you want to mark. Everything happens in your browser.
Write the watermark text
Keep it short and official-looking: your name, your studio, or something like © 2026 Your Name. Long sentences become unreadable.
Set size and opacity
Use the 1–2% of width rule from above, and start around 45% opacity — the tool's default. Raise opacity for drafts, lower it for portfolio shots.
Apply and download
Press apply, check the preview at full size, and download the watermarked PNG.
Common mistakes to avoid
- Leaving opacity at the faintest setting. Anything too subtle disappears completely once the image is resized for the web — 30% is usually the floor for photos.
- Writing a whole paragraph. A watermark is a mark, not a caption — name and year are enough.
- Ignoring image resolution. Text sized for a small upload looks like a speck on a 4000-pixel original; scale it with the image.
- Watermarking before resizing. Always crop and resize first, watermark last.
- Forgetting the unmarked original. Keep a clean copy for yourself and only distribute marked versions.
- Assuming it prevents all reuse. For images that must stay protected online, combine the watermark with a lower resolution export.
The short version
A good watermark is readable but quiet: roughly one percent of the image width, moderate opacity, placed where it does not cover the subject — and applied last, after every other edit. With the free browser tool the whole thing takes under a minute per image.
Tools for this guide
Related guides
How to Resize an Image Without Stretching It
Squashed faces and distorted logos happen when width and height are changed independently. Learn the aspect-ratio rule, the exact resize workflow, and when cropping is the better choice.
How to Compress Images Without Losing Quality
Large images slow down websites and blow past upload limits. Learn why image files get big, how far you can safely compress, and how to shrink JPG, PNG and WebP files so the difference stays invisible.
How to Convert HEIC Photos to JPG or PNG
HEIC photos look perfect on an iPhone but fail everywhere else. Learn what the format is, when to pick JPG or PNG, and how to convert your files in a few clicks.
Put the guide into practice
Every guide here maps to a free ToolPilot tool you can use right now — no installation and no account required.
Browse all tools