How to Add a Watermark to a Photo — Free, In Your Browser (2026)

You spent time and skill making a photo look good, and the moment it goes online anyone can right-click, save, and reuse it. A watermark will not stop a determined thief, but it does two useful jobs: it makes casual reuse obvious and annoying enough that most people move on, and it stamps your name, brand, or website onto every copy that spreads. This guide covers why to watermark, the real difference between a corner mark and a tiled one, the opacity that keeps text readable without ruining the photo, and how to add a text watermark in seconds without uploading your image anywhere.

1. Quick Answer

2. Why Watermark Your Photos

A watermark is a visible mark laid over a photo — usually semi-transparent text or a logo — that identifies the owner. It is not encryption and not copyright registration; it is a deterrent and a credit line rolled into one. Here is where it earns its keep:

• Proof of ownership. When your name or site is baked into the image, a screenshot or re-upload carries your attribution with it. That makes disputes over "who shot this" far easier to settle.
• Deterring casual reuse. Most image theft is lazy — someone grabs a photo for a blog, a listing, or a social post. A visible mark makes that copy look unprofessional to them, so they either move on or, occasionally, contact you for a clean version.
• Free marketing. A website URL on a photo that gets shared is a billboard. Portfolio shots, infographics, and product images that travel keep pointing back to you.
• Client proofs and previews. Photographers deliver watermarked, low-opacity previews so clients can choose shots before paying. The tiled mark makes the proof useless as a finished file while still fully viewable.
• E-commerce and listings. Sellers watermark product photos so competitors cannot lift them for their own listings — a common problem on marketplaces.

3. Text vs Logo Watermarks

There are two kinds of watermark, and they solve slightly different problems.

Text watermarks

A text watermark is typed characters laid over the photo: your name, business name, a website URL, or a copyright line. Text is the fastest option — nothing to prepare, no image file, and it scales cleanly to any size because it is drawn as vectors before being rendered. It is also the most flexible: you can change the wording per photo, add the year, or drop in a URL. Convertlo's watermark tool is a text watermarker, which covers the overwhelming majority of ownership, branding, and copyright use cases.

Logo watermarks

A logo watermark places a prepared graphic — a brand mark, monogram, or signature — onto the photo. Logos reinforce brand identity and look polished on a portfolio, but they need a transparent PNG made in advance, and they can pixelate if you scale them larger than their native resolution. If you want a graphic mark, prepare a transparent PNG first; for everything else, a clean text watermark is faster and sharper at any size.

4. How to Add a Watermark in Convertlo

Convertlo's watermark tool runs entirely in your browser using the HTML canvas. The photo is drawn and the text is painted on top locally — nothing is sent to a server, so it is safe for private, client, or unpublished images.

5. Placement Strategy: Corner vs Tiled

Placement is the single most important watermark decision, and it comes down to a trade-off between how the photo looks and how protected it is.

A corner is subtle — and easy to crop out

A small mark in the bottom corner is the professional-looking default. It stays out of the subject, reads as a signature, and does not distract. The catch is that it is trivial to defeat: anyone can crop the bottom strip off the image, or clone/inpaint over that one spot in seconds. A corner watermark is a credit line, not real protection. Use it when the main goal is attribution and the photo is one you are comfortable having circulate.

Tiled coverage is intrusive — and genuinely hard to remove

Tiling repeats the watermark text in a diagonal grid across the entire image. Because the mark sits over the subject and appears dozens of times, you cannot crop it away without destroying the photo, and removing every instance by hand is tedious enough that almost no casual thief will bother. AI removal tools also struggle far more with a dense repeating overlay than with an isolated corner mark. The cost is that tiling is visually intrusive — it is meant for proofs, previews, and public galleries where deterrence matters more than looking clean, not for the final file you hand a client.

6. Opacity, Size, and Legibility

The right opacity keeps the mark readable without swamping the photo, and it depends on placement.

• Corner watermark: 40–60% opacity. Visible and legible, but light enough to read as a signature rather than a stamp.
• Tiled watermark: 15–30% opacity. Because the text repeats many times, higher opacity would overwhelm the image; low opacity still makes the pattern impossible to ignore or cheaply remove.

Legibility also depends on your specific photo. A watermark that reads perfectly over a dark sky can vanish over a bright one. Two things help: choose a semi-transparent white or light grey (it survives most backgrounds better than a solid dark color), and, if the tool offers it, add a slight shadow or outline so the text stays legible over mixed light and dark areas. Always eyeball the mark against the busiest part of your photo before exporting — that is where watermarks disappear.

For size, scale the font to the image dimensions rather than a fixed pixel value. A 24px watermark that looks right on a 1000px preview will be a speck on a 6000px full-resolution export. Match the mark to the photo it sits on.

7. The © Symbol and Year Convention

The conventional copyright line is three parts: the copyright symbol, the year the work was created, and the name of the rights holder — for example © 2026 Jane Doe or © 2026 convertlo.pro. The symbol is not legally required for you to hold copyright (in most countries you own it automatically the moment you create the photo), but including it signals ownership clearly and removes any "I didn't know it was protected" excuse.

How to type the © symbol:

• Windows: hold Alt and type 0169 on the numeric keypad, or use the emoji/symbol picker (Win + .).
• Mac: press Option + G.
• Phone / anywhere: copy the symbol from any source and paste it into the watermark text field.

Use the year the photo was taken or first published, not necessarily the current year, especially when watermarking an older archive. In Convertlo's watermark tool you simply type or paste that full line as your watermark text and place it wherever you want.

8. Methods Compared

You can watermark a photo in several ways. Here is how the common options stack up on the things that actually matter — whether they can tile, whether you have to install software or sign up, and whether your photo stays private.

Photoshop and GIMP are powerful and keep files local, but both need a real install and, in Photoshop's case, an ongoing subscription — overkill if all you want is a name or copyright line on a photo. Many phone apps are quick but bury the feature behind an account, a subscription, or a watermark of their own, and some upload your image to process it. Convertlo covers the common case — text watermark, corner or tiled, adjustable size and opacity — with no install, no account, no upload, and no added branding.

9. Frequently Asked Questions

A watermark is a small step that pays off every time your photo travels. Match the placement to the risk — a corner for a credit, tiling for real protection — keep the opacity readable, and add a copyright line where it counts. Then it takes about a minute per image, free and entirely in your browser.