Image Watermark
Add a Text Watermark to an Image
Stamp a repeating line of text across a photo to mark it as yours
- Runs in your browser
- Nothing uploaded
- No sign-up
- Free, no daily limits
- 1Add your file
- 2Choose settings
- 3Download
Drop an image here
Choose a fileSelect an image to watermark · up to 20 MB · nothing is uploaded
100% Private: All processing happens in your browser. Your files never leave your device.
Last updated
Add Watermark provides browser-based image copyright protection by stamping customizable translucent gray text across your photographs. You can tile repeating text diagonally over the entire frame or position a single watermark in the center, adjusting both opacity and font size with instant visual feedback.
Because the rendering pipeline operates 100% on client-side HTML5 canvas, your original photos, identity cards, and creative proofs never touch a remote server. This makes it an ideal privacy-preserving tool for freelance photographers, business appraisers, and individuals sharing sensitive documents online.
How it works
1. Select an image to watermark
Upload a JPEG, PNG, or WebP photo up to 20 MB. Your file is read locally into memory without network transmission.
2. Set watermark text and opacity
Type your ownership notice or classification mark (such as DRAFT or COPY). Adjust opacity between 5% and 80% to balance visibility and readability.
3. Configure font size and tiling
Choose a font size from 12px to 120px. Keep the Tiled switch enabled for full-frame diagonal coverage or turn it off for a single centered stamp.
4. Process and download
Click Apply Watermark & Download to render the watermark onto full-resolution canvas pixels and save your protected image.
When you'd use it
Protecting e-commerce and real estate listings
Apply full-frame tiled watermarks to prevent competitors and scrapers from downloading and republishing your proprietary product or property photos.
Stamping identity cards for verification only
Stamp 'FOR VERIFICATION ONLY' across photocopies of Aadhaar, passports, or driver licenses before submitting them to third-party services.
Sharing design proofs and photography previews
Send draft client mockups or photography proofs with prominent translucent copyright notices prior to receiving final invoice payments.
Internal business drafts and confidential audits
Label preliminary audit reports, screenshots, or internal schematics with bold diagonal 'CONFIDENTIAL' markers.
How do tiled watermarks protect against removal?
Single watermarks placed in image corners are trivial to eliminate with basic cropping tools. TryDocsy uses a diagonal repeating grid calculated dynamically from your text's measured width and selected font size. The text rotates by -30 degrees (-Math.PI / 6) across the canvas, with horizontal gaps equal to text width plus twice the font size, and vertical gaps set to four times the font size.
This dynamic spacing ensures that watermarks traverse both uniform backgrounds and high-entropy textured regions like faces, clothing, and foliage. Automated generative AI inpainting tools struggle when translucent text overlays complex high-frequency details, making tiled coverage significantly more resilient against automated watermark removers.
Choosing between TryDocsy tools (Use this, not that): if you need to place a solid caption bar with candidate details, use Add Text to Image instead of watermarking. If you only need to remove an unwanted border or edge timestamp, use Crop Image. If a photo was shot sideways on a smartphone, correct orientation with Rotate Image. If you need to obscure a license plate or private face completely, use Pixelate Image rather than a translucent watermark.
| Mode / Setting | Text & Angle | Opacity & Font | Output Size (JPEG 0.95) | Protection Level |
|---|---|---|---|---|
| Tiled Diagonal | CONFIDENTIAL (-30 deg) | 30% opacity, 36px font | 1,617,369 bytes (1579.5 KB) | High (full-canvas coverage) |
| Subtle Tiled | COPY ONLY (-30 deg) | 15% opacity, 24px font | 1,619,420 bytes (1581.5 KB) | Medium (discreet repeat) |
| Single Centered | PROOF (-30 deg) | 50% opacity, 72px font | 1,621,800 bytes (1583.8 KB) | Low (corners remain croppable) |
Source: Wikimedia Commons CC0 photo Dongans Oak GPS by Jim.henderson tested on Chrome 156, checked October 29, 2026
Format output rules and technical limits
The watermark color is fixed to neutral translucent gray (rgba 128, 128, 128, opacity / 100), ensuring consistent visibility over both dark and light photographic regions. The text font is set to bold Arial sans-serif for clean legibility.
Export format follows our standard canvas rule: PNG uploads export as PNG with alpha transparency preserved. All other input formats (JPEG, WebP, GIF) are painted onto a solid white background (fillStyle #ffffff) before encoding as JPEG at 0.95 quality. Re-encoding drops all original EXIF tags, GPS metadata, and camera fingerprints. If you want to sanitize metadata without altering image pixels, use our EXIF remover.
When not to use this tool: TryDocsy Add Watermark is text-only. If you need to stamp a graphical brand logo, PNG emblem, or custom vector watermark, use desktop software like Photoshop or an advanced web editor. It is also designed for single-file processing; if you need to watermark hundreds of photos in batch, desktop software like ImageMagick or Digikam is a more suitable option.
Frequently asked questions
How do I watermark photos so they cannot be removed easily?
Keep Tiled mode enabled, set opacity between 30% and 50%, and choose a font size between 32px and 48px. Tiled watermarks cut across the center and textured areas of the photo, preventing simple cropping and confounding automated inpainting algorithms.
Can I upload a company logo or image watermark?
No. This tool only generates text watermarks. There is currently no option to upload external PNG logos or graphic stamps.
Can I customize the watermark color or rotation angle?
No. The color is locked to translucent neutral gray (rgba 128, 128, 128) and the tilt is fixed at -30 degrees diagonally. You control the text string, opacity (5% to 80%), and font size (12px to 120px).
Why is the Apply Watermark button disabled?
The button remains disabled until you type at least one character into the Watermark Text field. Enter your desired text to activate processing.
Will watermarking my photo keep transparent PNG backgrounds?
Yes, if you upload a PNG file, the output remains a transparent PNG. All other formats are rendered over a solid white background and exported as JPEG.
What is the maximum file size supported for watermarking?
The upload limit is 20 MB per image. Everything executes locally in your browser memory without server uploads.