Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.
- Runs locally
- Category Generator
- Best for Starting from a blank page without committing to the first result.
100% local. Nothing leaves your browser.
What this tool does
A 100% in-browser image watermarker that stamps text or another image onto your photos without ever uploading them. Drop in up to ten pictures, type the watermark text (or upload a transparent PNG logo), pick one of the nine grid positions — corners, edges, dead center — or switch to tile mode to repeat the mark diagonally across the whole frame. Tweak opacity from 0 to 100, set the font family / size / color for text, dial in margin from the edge, and preview each photo live before exporting. Hit "Apply to all" to run the same recipe across the batch, then download a single PNG or a zip with everything together. Everything runs on a Canvas pipeline inside your tab: no upload, no account, no quota, ~25 KB of JS total. Perfect for tagging product shots, fighting image theft on Xiaohongshu / Twitter, watermarking proofs before client review, or just slapping a discreet "© your-name 2026" on every photo you publish.
Tool details
- Input
- Files + Text + Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Download + Preview
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 25 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Generator · Designer
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
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1. Input
Paste or drop your content into the tool panel.
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2. Process
Click the button. All processing is local in your browser.
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3. Copy / Download
Copy the result or download to disk in one click.
How Image Watermark fits into your work
Use it to get a strong first draft, starter asset, or structured output that you can edit before publishing.
Generation jobs
- Starting from a blank page without committing to the first result.
- Creating repeatable drafts, names, templates, or placeholder assets.
- Exploring options before choosing the one that fits the job.
Generation checks
- Review generated output before it reaches a customer, page, or document.
- Change defaults when you need a specific brand voice, format, or audience.
- Keep only the parts that match the real task.
Good next steps
These links move the current task into a more complete workflow.
- 1 Favicon Generator Generate favicon set — text or upload, output 16x16 / 32x32 / 180x180 / 512x512 PNG. Open
- 2 Image Resizer Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload. Open
- 3 Image Format Converter Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side. Open
Real-world use cases
Stamping 200 Shopify product photos with the same brand mark
You shot 200 SKUs for a Shopify store and need every photo to carry the same bottom-right logo before they go live. Upload your transparent PNG once, set it to 12% of the shorter edge at 70% opacity, hit "Apply to all" across ten-image batches, and zip each batch out. Twenty rounds, settings frozen between them, done in well under ten minutes without a single file leaving your laptop.
Tiling a diagonal mark on photography proofs before client review
A wedding shooter sends 40 low-res proofs to the couple for selection. Switch to tile mode, type "PROOF — not licensed", drop opacity to about 18%, and the diagonal repeat makes every crop useless for printing while the couple can still judge composition and expression. The watermark survives a right-click save and an Instagram re-upload, so nobody prints before they pay the balance.
Tagging Xiaohongshu posts to fight screenshot reposting
You run a Xiaohongshu account and keep finding your outfit shots reposted without credit. Add a small "@yourhandle" text watermark centered at 25% opacity so it sits over the subject and can't be cropped to a clean rectangle. Run it on the 9 photos of a carousel in one batch, and even a screenshot-and-repost still carries your handle back to your account.
Marking internal screenshots "Confidential" before a deck
Before pasting six product screenshots into a board deck, you want each one stamped so a leaked slide is traceable. Use tile mode with "CONFIDENTIAL · 2026-05" at 15% opacity in a light gray. The mark repeats across the whole frame, reads clearly at slide size, and because nothing uploads, the unreleased UI never touches an outside server while you prep the deck.
Common pitfalls
Using a JPG logo as the watermark — its white background paints onto your photo. Export the logo as a transparent PNG first so only the mark shows.
Setting opacity too high (80%+) on a centered mark — it buries the subject. For visible-but-not-distracting, keep single marks near 60% and tiled marks near 18%.
Picking a single corner anchor when crop-resistance matters — a 2-second crop removes it. Use tile mode for anything you actually need to protect.
Privacy
Every image you drop in — the photo, the logo PNG, and the composited result — is processed entirely in your browser tab via FileReader and a Canvas pipeline. Nothing is uploaded, no account is needed, and the watermark text, font, and opacity settings live only in this tab's memory. URL sharing carries only the non-image recipe (position, opacity, text), never the photos themselves, so unreleased product shots and proofs never appear in a link or on a server.
FAQ
Tool combos
Folks in your role tend to reach for these alongside this tool.
- Aspect Ratio Calculator Calculate aspect ratio — fix any 1 of [width, height, ratio], get the other two.
- Base64 Encoder & Decoder Encode or decode Base64 — text, files, and Data URLs. Runs entirely in your browser.
- Base64 Image Converter Image ⇄ Base64 — drag-drop PNG/JPG/WebP/SVG, get data URI for CSS / HTML / Markdown.
- Base64 to File Converter Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.