Canvas Watermark Batch
Watermark up to 50 images at once with text or a logo PNG. Choose position, opacity, size, and tiling - then download all results as a ZIP. Nothing is uploaded to a server.
Watermark up to 50 images at once with text or a logo PNG. Choose position, opacity, size, and tiling - then download all results as a ZIP. Nothing is uploaded to a server.
This free Canvas Watermark Batch from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Canvas Watermark Batch
- Drop your image into the upload area, or click to browse.
- Pick the output format, size or compression level.
- Click "Process" - the tool runs and shows a preview.
- Download the result. Most tools delete your file from the server immediately after.
What you can do with the Canvas Watermark Batch
- Optimise images for web pages and faster Core Web Vitals.
- Resize photos for social media specs (1080×1080, 1200×630, etc.).
- Convert HEIC, AVIF or WebP to a more compatible format.
- Strip EXIF metadata before sharing photos online.
Why use KX Toolkit's Canvas Watermark Batch
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Compress your image AFTER resizing - running them in that order produces smaller files at the same visual quality.
Related Image Tools
If you find this tool useful, explore the full Image Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How many images can I watermark at once?
Up to 50 images per batch. The browser processes them one at a time and yields control between images using requestAnimationFrame, so the page stays responsive even with bigger batches. If you drop more than 50 files, the tool keeps the first 50 and warns you. For larger jobs, run the batch in groups - settings are remembered between runs as long as you do not refresh the page.
Are my images uploaded anywhere?
No. The watermarking happens entirely in your browser using the Canvas 2D API. Source images are read locally, drawn onto a canvas, the watermark is composited on top, and the result is exported as a JPG blob ready for download. There is no server round trip and no telemetry - perfect for confidential brand or client images that should never leave your device.
Can I use both text and image watermarks?
You pick one mode per batch - either Text or Image. In Text mode you can choose font (Inter, Roboto, Pacifico, Arial, Georgia), color, size, and opacity. In Image mode you upload a PNG (transparency supported) or any image, and it is composited onto each photo. If you need both - a logo and a text line - combine them into one PNG with transparency in your design tool, then upload that as the watermark.
How does the "Tile across image" option work?
When tiling is enabled, the watermark is repeated diagonally across the whole image at roughly minus thirty degrees. This is the standard ownership pattern used by stock photography sites and is much harder to remove than a single corner mark. Tiling pairs well with lower opacity (around forty percent) so the watermark is visible without overpowering the photo.
What format are the outputs in?
All outputs are JPG at 0.85 quality, which gives a good balance between file size and visual fidelity. PNG output is intentionally not offered because watermarked photos are usually meant for sharing rather than further editing, and JPGs are dramatically smaller. If you need a different format, run the watermarked output through an image converter afterwards.
Can I compare the watermarked image against the original?
Yes - click any thumbnail in the result grid to flip between the watermarked version and the original. This makes it easy to confirm the watermark is positioned correctly and is not covering important parts of the image. Both versions are held in memory only for the current page session, so refreshing the page clears them.
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