FastImageToolsFastImageTools

Add Watermark to Images Online — Free & Private

Protect your photos with text or logo watermarks — fast, free, and private.

Free — no hidden feesBatch + ZIP download
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Images are processed locally in your browser whenever possible. If local processing isn't supported or fails, we automatically complete the job on our servers — no action required. Supports JPG, PNG, WebP, and GIF. Text and logo watermarks, batch processing, tiled patterns — no signup, no fees.

Why Use FastImageTools

Local-First Processing

Watermarks are applied in your browser by default using WebAssembly. Automatic server fallback if needed.

Instant Results

Preview your watermark in real time before applying. No signup or email required.

Completely Free

No watermarks on our watermarks, no file limits, no hidden fees. Professional-grade watermarking at zero cost.

Smart Positioning

Choose from corner, center, or tiled placement. Auto-scale adjusts watermark size relative to each image.

How to Add Watermarks

  1. 1

    Upload Your Images

    Drag and drop or browse your files. Batch upload supported — watermark dozens of images at once.

  2. 2

    Configure Your Watermark

    Add text or upload a logo. Adjust position, opacity, scale, and choose single or tiled placement.

  3. 3

    Download Watermarked Images

    Preview the result, then download files individually or as a ZIP archive.

Browser-Based vs Cloud Watermarking

FastImageTools (Local-First)

  • Images stay on your device by default
  • Instant processing — no upload wait
  • Handles large files locally when possible
  • Free with no usage caps
  • Automatic server fallback if needed

Cloud-Based Tools

  • —Files uploaded to third-party servers
  • —Speed limited by upload and download
  • —Typical 5–25 MB file size limit on free tiers
  • —Often requires paid plans for batch or large files
  • —Requires a stable internet connection

Example Result

Original

2.4 MB

product-photo.jpg

-Text watermark appliedJPEG → JPEG

Watermarked

2.5 MB

© 2024 Studio — bottom-right, 60% opacity

Supported Image Formats

JPEG / JPG

Photos from cameras and phones. Add watermarks while preserving photo quality.

PNG

Screenshots and graphics with transparency. Watermark without affecting alpha channels.

WebP

Modern web format — add watermarks and keep the smaller file size advantage.

GIF

Simple animations and graphics. Watermark static GIFs with text or logos.

Frequently Asked Questions

Will adding a watermark reduce image quality?+
Watermarks are composited on top of the original image. For lossless formats like PNG, the rest of the image is untouched. For lossy formats like JPEG, the image is re-encoded once — quality loss is minimal and controlled by your output settings.
Is it safe to watermark images here?+
Yes. By default, watermarking runs entirely in your browser via WebAssembly — your files stay on your device. If your browser doesn't support local processing, images are processed on our secure servers and deleted automatically within 72 hours of completion.
What is the maximum file size I can watermark?+
Browser-based processing handles images up to approximately 100 MB depending on your device's CPU and RAM. For very large files, the tool automatically routes processing to secure cloud servers.
Can I watermark multiple images at once?+
Yes. Upload an entire batch of images and apply the same watermark to all of them simultaneously. The watermark auto-scales relative to each image's dimensions. Download results as a single ZIP file.
Should I use a text or logo watermark?+
Text watermarks are great for copyright notices and quick branding — no extra files needed. Logo watermarks are ideal for professional branding with your company mark or signature. Both support custom positioning, opacity, and tiled placement.
What's the difference between single and tiled watermarks?+
Single placement puts one watermark at a chosen position (corner, center, etc.). Tiled placement repeats the watermark across the entire image in a diagonal pattern — much harder to crop out or remove, ideal for protecting preview images.
How is browser-based watermarking different from cloud tools?+
Most cloud tools always upload your images to a remote server. FastImageTools processes images locally in your browser by default — faster and more private. If local processing isn't available, we fall back to our secure servers automatically.
Are my images uploaded to your servers?+
FastImageTools processes images locally in your browser whenever possible. In rare cases where local processing isn't supported or fails, we automatically process images on our servers to complete the job. Server-processed files are deleted within 72 hours of completion. This happens transparently — no action is required from you.

Related Image Tools

Done watermarking? These tools work great as a next step:

Compress Image

Reduce file size of watermarked images for faster sharing.

Resize Image

Change dimensions for social media, email, or web.

Crop Image

Trim and reframe your watermarked images.

Convert to WebP

Switch to the modern WebP format for smaller files.

Remove Background

AI-powered background removal for product photos.

Metadata Editor

View, edit, or strip EXIF and GPS data from images.

We value your privacy

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