Apply the same text or logo watermark to an entire folder of photos and PDFs in one go — with consistent placement across different sizes — and download everything as a ZIP.
No uploads. No limits. No sign-up. And no watermark of ours on your files.
Unlimited files
Images + PDFs together
ZIP download
No upload wait
Drop images or PDFs here
JPG, PNG, WebP, HEIC, GIF, AVIF or PDF · multiple files allowed
🔒 Your files stay on your device — we never upload or store them.
Choose files
Live previewSample image — add your files to preview them
💡 Tip: click or drag on the preview to move the watermark.
🔒 Processed 100% in your browser. Files are never uploaded or stored.
Your watermarked files
🚫
Never uploadedYour images and PDFs are opened and processed by your own browser. They are not sent to our server or anyone else’s.
🗑️
Never storedWe don’t keep any copy of your files, logos or results — there is no upload endpoint and no file storage at all.
🧹
Gone when you close the tabFiles only live in your browser’s memory while you work. Close or reload the page and they are gone.
Don’t take our word for it: after loading your files you can even disconnect from the internet and the tool keeps working. How we handle your files
Select all your files at once (Ctrl/Cmd + A in the file picker) or drag a whole selection into the tool. You can mix JPG, PNG, WebP and PDF.
Design the watermark once. Click any file in the list to check how it looks on it.
Choose a positioning mode that suits a batch: Percentage keeps the same relative spot on landscape and portrait images; Pixels keeps an exact distance from a corner.
Optionally resize (e.g. longest side 2048 px) and convert to WebP or JPG for the web.
Click Add watermark, then Download all (ZIP).
Why batch watermarking in the browser is faster
Traditional online tools upload every file to a server, process it and send it back — with large photo sets that means minutes of waiting and size limits, and your files sit on someone else’s server. WatermarkOn skips the round-trip: files are processed directly on your device, as fast as your computer allows, and nothing is uploaded or stored. There is no file limit; the only constraint is your device’s memory.
Compared with desktop batch features (Photoshop Actions, Lightroom export presets, GIMP plug-ins), there is nothing to install or configure.
Frequently asked questions
How many images can I watermark at once?
There is no fixed limit. Hundreds of photos work fine on a modern computer; on phones, batches of a few dozen are more comfortable.
Will the watermark look the same on vertical and horizontal photos?
Yes. The watermark size is relative to each image’s width, and with Percentage or Preset positioning it lands in the same relative spot on every image.
Can I keep the original file names?
Yes. Files keep their names plus a suffix (default “-watermarked”). Clear the suffix field to keep the exact original names.
