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BigWatermark

Free • No sign-up • PDFs & images stay on your device

Bulk Watermark PDFs & Images Online

Add a text or logo watermark to hundreds of PDFs, JPG, PNG and WebP images in one go. Drop in files, a folder or a ZIP archive, preview the result live, then download everything as a single ZIP.

Drop PDFs, images, Word files or a ZIP here

Single files, multi-file batches, whole folders or ZIP archives — extracted automatically.

No files handy? Try a sample:
  • PDF
  • JPG, PNG, WebP
  • DOCX / DOC
  • ZIP in & out
  • PDFs & images never uploaded

Pick a watermark preset to start

Everything can be adjusted in the work panel

Prefer a logo? Switch to Image in the work panel and upload a PNG, JPG, WebP or SVG.

About the tool

What is BigWatermark?

BigWatermark is a free online tool for adding text or logo watermarks to many PDFs and images at once. Instead of opening files one by one, you drop in a whole batch — loose files, a folder or a ZIP archive — design the watermark once with a live preview, and apply it to every page of every file in a single click.

BigWatermark at a glance

Price
Free — no sign-up, no subscription, no branding added to your files
Input formats
PDF, JPG/JPEG, PNG, WebP, DOCX/DOC (converted to PDF) and ZIP archives
Output
Watermarked PDFs and images in their original format, individually or as one ZIP
Watermark types
Text (font, size, color, spacing) or image/logo (PNG, JPG, WebP, SVG)
Layout options
Opacity, rotation, 9 positions, custom X/Y, tiled grid or staggered pattern
PDF page targeting
All, current, first, last, odd, even or custom ranges such as 1-3, 8
Where files are processed
PDFs and images in your browser; Word files on our server, deleted right after conversion
Batch size
No fixed limit; files are processed one by one, so it depends on your device memory

How it works

How to watermark PDFs and images in bulk

Watermarking a whole batch takes four steps and usually less than two minutes.

  1. 1

    Add your files

    Drag and drop PDFs, JPG, PNG or WebP images, Word documents, a folder or a ZIP archive onto the upload area, or click to browse.

  2. 2

    Design the watermark

    Type your text or upload a logo, then adjust font, color, size, opacity, rotation, position and tiling while the live preview updates.

  3. 3

    Apply to every file

    Click "Apply" and BigWatermark stamps the same watermark on every page of every PDF and on every image in the batch.

  4. 4

    Download the results

    Download each watermarked file on its own or save the whole batch as one ZIP archive with a file name of your choice.

Features

Everything you need to watermark at scale

Bulk & ZIP processing

Add hundreds of files, whole folders or ZIP archives. Every supported file is extracted, watermarked and can be downloaded again as one ZIP.

Private by design

PDFs and images are processed locally by your browser and never uploaded. Only Word files are converted on our server, then deleted.

Full-resolution images

JPG, PNG and WebP photos keep their original pixel size and format. Watermarks scale with each image so mixed batches look consistent.

Real PDF watermarks

The watermark is written into each page, so it shows in every PDF reader and prints. Text, forms and scans in the original are preserved.

Flexible placement

Pick one of nine positions, set exact X/Y coordinates, rotate from −180° to 180°, or tile the mark across the page in a grid or brick pattern.

Page targeting

Stamp every page, only the first or last page, odd or even pages, or a custom list of pages and ranges in each PDF.

Tools

Choose the right watermark tool

Add a Watermark to PDF Files — One or Hundreds at Once

Watermark PDF files online for free. Stamp CONFIDENTIAL, DRAFT or your logo on every page, choose pages, tile patterns and batch-process PDFs in your browser.

Open watermark pdf tool

Watermark Photos & Images in Bulk (JPG, PNG, WebP)

Batch watermark photos online. Add your logo or © text to JPG, PNG and WebP images at full resolution, preview live, then download them all as a ZIP. Free and private.

Open watermark images tool

Bulk Watermark a ZIP File of PDFs and Images

Upload a ZIP archive and watermark every PDF and image inside it in one pass. BigWatermark unpacks, stamps and re-zips your files in your browser. No sign-up.

Open bulk zip tool

Use cases

Who uses BigWatermark?

Photographers

Add a signature or logo to client previews and portfolio images in one batch.

Businesses

Mark reports, price lists and proposals as CONFIDENTIAL or DRAFT before sharing.

Legal & finance

Label copies, exhibits and statements without uploading sensitive PDFs anywhere.

Educators

Brand worksheets, exam papers and course notes with your school or channel name.

Real estate

Put the agency logo on every listing photo before posting to property portals.

Online sellers

Protect product photos with your store name so competitors can’t reuse them.

Comparison

BigWatermark vs. other ways to add watermarks

How a browser-based batch tool compares with the usual alternatives.

CriteriaBigWatermarkDesktop PDF/photo editorsTypical upload-based websites
CostFreeOften a paid license or subscriptionFree tiers with limits
InstallationNone — runs in the browserSoftware install requiredNone
Batch / ZIP supportYes, ZIP in and ZIP outVaries; batch features often in paid tiersOften limited per file or per day
PDFs and images in one batchYesUsually separate appsUsually separate tools
Where files goPDFs & images stay on your deviceStay on your deviceUploaded to a remote server
Account requiredNoUsuallyOften for larger files

FAQ

Frequently asked questions

What is BigWatermark?

BigWatermark is a free online tool that adds a text or logo watermark to many PDFs and images at once. You can drop in individual files, a whole folder or a ZIP archive, preview the watermark live, and download every watermarked file individually or together as one ZIP.

Is BigWatermark really free?

Yes. There is no sign-up, no subscription and no paid tier. BigWatermark never adds its own logo or branding to your files. The site is supported by advertising on content pages, never inside your files.

Are my files uploaded to a server?

No for PDFs and images: they are read, watermarked and saved entirely inside your browser and never sent to us. Word documents (.docx/.doc) are the only exception: they are sent over an encrypted connection to our conversion server, turned into a PDF and deleted immediately. See the Privacy Policy for details.

Which file types can I watermark?

You can watermark PDF files, JPG/JPEG, PNG and WebP images, and Word documents (.docx and .doc, which are converted to PDF first). You can also upload a ZIP archive that contains any mix of these files.

How many files can I watermark at once?

There is no fixed limit on how many files you add. Files are processed one after another to keep memory use low, so the practical limit depends on your device. Most laptops comfortably handle hundreds of typical PDFs or photos in a single batch.

Does watermarking reduce the quality of my images?

No resizing happens: every image keeps its original pixel dimensions and format. PNG files are saved losslessly, while JPG and WebP files are re-encoded at high quality (about 92%), which is visually indistinguishable from the original for most photos.

More answers on the FAQ page.

Guides

Watermarking guides and tips

See all guides