Helphonic

Watermark

Add a text or logo watermark to an image or PDF. Choose placement, size, color and transparency.

3 free operation(s) per day

Temporary files are private and removed after your download response.

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Current limits

per operation

Files
2
Per file
5 MB
Total size
20 MB
Pages
100
Read the security details
Limit comparison

How to increase limits

Compare the per-operation limits available after registration or with an active paid pass.

Free account

Registered user

10 free operation(s) per day

Files
2
Per file
5 MB
Total size
20 MB
Pages
100
Create a free account
All access passes

Unlimited operations during active validity, subject to abuse safeguards.

Files
2
Per file
5 MB
Total size
20 MB
Pages
100
View packages

Frequently asked questions

What counts as one operation?

One successful export counts as one operation, even when it contains multiple pages. Changing options and local previews do not use your allowance. A failed server validation does not consume an operation.

Are my files shared or stored?

No third-party processing service is used. Uploads go to private Helphonic storage and are removed after the response. Local previews and rendered images remain in browser memory until you leave or reload the page.

Can the free and paid limits change?

Yes. Administrators can configure guest, registered and active-pass access and processing limits independently. See the current limits on this page.

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How to use

Watermark

Add text or a raster logo to an image or selected PDF pages, with adjustable position, size and opacity.

Step-by-step instructions

  1. Choose one JPG, PNG, WebP or PDF as the target.
  2. Choose Text and enter the wording, or choose Image logo and select one JPG, PNG or WebP logo.
  3. Choose the position, opacity and relative width. Set Text color when using a text watermark.
  4. For a PDF, leave the page range blank for all pages or enter a range such as 1-3,5, then confirm the compatibility notice.
  5. Run Watermark, download the result and inspect the watermark on every relevant page or image.
Inputs, wording and logo

The target can be one JPG/JPEG, PNG, WebP or PDF. A logo must be a JPG, PNG or WebP image, up to 2 MB and 2 megapixels. The target and optional logo both count toward file and upload-size limits.

Text accepts 1 to 100 English letters, numbers and punctuation. For Bangla or other scripts, prepare the wording as an image logo. PDF is supported as a target, not as a logo.

Placement and output

Choose one of nine positions across the top, center or bottom. Relative width runs from 5% to 80% of the page or image; tall marks are constrained to fit. Opacity runs from 10% to 100%. Text color affects text marks, while image logos keep their own colors.

Image output keeps the source JPG, PNG or WebP format. PDF output retains every source page and marks only the chosen pages. The page range does not extract or remove unmarked pages.

Troubleshooting

Keep the original PDF. Rebuilding pages does not preserve interactive forms, annotations, bookmarks, layers or digital signatures. Encrypted, damaged and some compressed PDF structures are unsupported. A PDF that opens in a viewer can still fail export. If necessary, create a standard, unlocked PDF copy in an application you trust and inspect that copy before using it here.

PDF export requires confirming the compatibility notice. The source-page limit covers the whole PDF, even when only a few pages receive a watermark. Smaller logos or fewer source pages can help with memory and output limits.

A watermark is a visible mark, not encryption, access control or secure redaction. If the mark is hard to read, increase opacity or contrast. If it covers important content, reduce its size or choose a different position.

Processing and privacy

The selected files are uploaded to Helphonic for processing in private storage. No third-party file-processing service is used. Temporary source and output files are removed after the download response, and failed processing cleans up temporary files. Keep your originals and save the result to your device.

About this tool

Choose one JPG, PNG, WebP or PDF and add text or a raster logo. Use nine positions and adjust relative size and opacity. PDF page ranges let you mark only selected pages. Text supports English letters, numbers and punctuation; use a logo image for other scripts. Logos are limited to 2 MB and 2 megapixels and count toward the upload limits. PDF output does not preserve interactive forms, annotations, bookmarks, layers or digital signatures. Encrypted and some compressed PDF structures are unsupported; keep the original.

Read the full Watermark guide (opens in a new tab)