How to watermark photos consistently
Choose a readable mark, keep its proportions across a batch, and export copies you can share.
Free toolPhoto WatermarkAdd text or a logo to a batch of photos. Preview every image, adjust individual placements and export a ZIP.Watermark your photosThe short answer
Add your text or a transparent logo over a copy of the photo. Use a relative size so the mark scales with the image, then check its placement on every composition.
- Finish cropping and resizing your photos.
- Choose text for a name or credit, or a logo for an existing brand mark.
- Set size and opacity on one image, then review portrait and landscape examples.
- Export new files and keep the clean originals.
Choose text, a logo or a tiled proof
A short text mark is the quickest starting point. A logo works best when its background is transparent and the artwork has little empty padding.
| Choice | Useful for | Tradeoff |
|---|---|---|
| Corner text | A name, website or photo credit. | Easy to crop away and can disappear against a busy background. |
| Logo image | Consistent branding with your existing artwork. | A small source logo becomes soft when enlarged. Empty padding affects alignment. |
| Tiled watermark | A client proof or draft with repeated marks. | Covers more of the subject and can make details harder to judge. |
Why a percentage needs a reference edge
A size of 24% is incomplete unless you know what it measures. Using the photo’s width makes the same mark larger on a landscape image than a portrait with the same shorter edge.
floi measures the mark’s total width against the shorter image edge. A long text string fits within that width, so adding words reduces the font size.
A reproducible mixed-shape example
At 24% size, the two 800-pixel short edges below produce the same 192-pixel mark. The square has a longer short edge, so its mark grows proportionally.
| Photo | 24% of width | 24% of shorter edge | 4% edge margin |
|---|---|---|---|
| 1200 × 800 | 288 px | 192 px | 32 px |
| 800 × 1200 | 192 px | 192 px | 32 px |
| 900 × 900 | 216 px | 216 px | 36 px |
Method, 29 September 2026: these are geometry calculations, not an image-quality benchmark. Choose Try sample batch in the tool, then Corner signature. The generated samples use these three dimensions. Mark size is 24%, margin is 4%, and rotation is 0°. Tall logos or rotated marks may shrink further to stay inside the image.
Check placement on the difficult photos
Review the brightest, darkest and busiest corners in your batch. A watermark that reads on a plain wall may disappear on foliage.
- Use an outline with light text on a bright photo.
- Move the mark away from a face or important product detail.
- Inspect the output at the size you will publish, not only in a large editor.
- Use an individual placement when one photo needs an exception.
A corner mark leaves more of the photo clear. A tiled pattern is harder to crop away completely, but neither prevents removal.
Pick a workflow that fits the job
A browser tool suits a prepared batch. An editor or a command-line workflow may be a better fit when watermarking is part of a larger production process.
| Method | Choose it when | Limit to consider |
|---|---|---|
| floi | You want a focused local text/logo editor, per-photo placement and a ZIP of copies. | One watermark layer, browser memory limits, no RAW development or metadata retention. |
| Lightroom Classic | Your photos are already in a Lightroom workflow and you want watermarking during export. | Requires the desktop application and its export setup. |
| Overlay Studio | You need several layers, blend modes and image adjustments in a browser editor. | More controls to learn. Its batch guide documents a 25-photo free limit. |
| ImageMagick | You need repeatable command-line compositing in a scripted workflow. | You must calculate scaling and placement, and inspect the results yourself. |
Adobe documents watermarking in its Lightroom Classic export settings. ImageMagick documents image overlays in its Composite reference. Overlay Studio’s batch guide describes its relative positioning and free batch limit. Sources checked 29 September 2026; those are vendor descriptions, not floi performance measurements.
What changes when you export
A visible watermark changes the image’s pixels. Saving the result usually means encoding the whole image again, even if the mark covers only one corner.
| Output | What to expect in floi |
|---|---|
| JPG | Suitable for photographs. Lossy encoding can alter pixels outside the watermark. Transparency becomes white. |
| PNG | Preserves transparency and avoids a new lossy encoding step. Photos can become much larger files. |
| WebP | Supports transparency with a quality setting. Export depends on the browser’s encoder support. |
floi keeps pixel dimensions and does not copy camera metadata or GPS tags into the result. Preserve a separate original if you need that information.
Keep the clean original
Export a watermarked copy rather than replacing your source. If you change the wording later, start from the original again instead of stamping over an earlier export.
A watermark identifies an image visually. It does not make copying impossible or restore missing ownership records.