Why Watermark a Spreadsheet?

Google Sheets™ has no built-in watermark. Watermark 4Sheets adds one without image editors or manual drawing.

⚠️ The Manual Way Is Painful

Labelling a sheet as confidential or draft usually means awkward workarounds:

External Image Editors: Creating a transparent, rotated text image by hand takes time.
Duplicate Images: Re-inserting a new version leaves old copies piled on top of each other.
Messy Cleanup: Finding and deleting watermarks across many tabs is tedious, and it's easy to delete the wrong image.
Inconsistent Styling: Every tab ends up with a slightly different size, color or angle.

✅ The Watermark 4Sheets Way

One sidebar handles the whole watermark lifecycle:

Instant Rendering: Type your text, adjust the sliders, and the watermark is drawn for you.
No Duplicates: Updating replaces the previous watermark instead of adding another one.
Safe Removal: Only watermarks created by the add-on are removed. Your other images are never touched.
Consistent Across Tabs: Apply the same watermark to the active sheet or to every sheet at once.

How It Works

Three steps from a plain sheet to a watermarked one.

Type Your Text

Open Extensions → Watermark 4Sheets → Open Watermark Sidebar and enter up to 100 characters.

Default text: CONFIDENTIAL
Bold, readable lettering
Settings remembered per spreadsheet

Style & Preview

Choose a color and adjust opacity, rotation and font size. The preview shows your own cells with column and row labels.

Preset swatches or any custom color
Opacity 5–60%, rotation -60° to +60°
Font size 20–80 px

Apply, Update or Remove

Apply to the active sheet or all sheets. Change your mind? Update or remove it in one click.

Clear success and failure messages per sheet
Updates replace, never duplicate
Your cells, formulas and formatting stay unchanged

Built for Clean, Predictable Watermarks

Every feature focuses on reliable watermark management without touching your data.

🖼️

Live Preview With Your Data

See the watermark over your sheet's real values, column widths and row heights, with A/B/C and 1/2/3 labels. Empty sheets show sample data.

🎨

Full Style Control

Text color, opacity from 5% to 60%, rotation from -60° to +60°, and font size from 20 to 80 px. Subtle or bold, it's your choice.

📑

Active Sheet or All Sheets

Watermark one tab or the whole spreadsheet. For multi-sheet runs you get a clear report of which sheets succeeded and which didn't.

♻️

Update Without Duplicates

Each watermark carries a hidden marker. Updating swaps in the new watermark first and then removes the old one, so you never lose it halfway.

🧹

Safe, Targeted Removal

Remove removes only the watermarks the add-on created. Logos, charts and other images in your spreadsheet are left alone.

🖨️

Show Print Area

Highlight the range that prints with the default settings, then drag the watermark exactly where you want it before printing or exporting to PDF.

🖨️ Placement, Printing & PDF Export

Watermark 4Sheets places the watermark as a semi-transparent image over the grid, centered near the top of your data (after any frozen rows and columns). It is not a native page background.

Before printing, click Show print area to see what will print, then drag the watermark into position. Clicking Update later puts it back in the default position.

✅ Anchored to Cells: The watermark moves with its anchor cell when rows or columns change.
✅ Drag to Adjust: Reposition it freely, like any image in Sheets.
ℹ️ One Per Sheet: It prints once, at its position. It does not repeat on every printed page.
ℹ️ Visual Label Only: A watermark does not prevent copying, downloading or editing.

Private by Design

The watermark is drawn in your browser and inserted with Google Apps Script. No external image service is involved.

🔒 No Spreadsheet Data Leaves Google

All watermark work happens inside your browser and your Google Sheets™ session:

Local Rendering: The watermark image is drawn in the sidebar. Your watermark text and image are never sent to Numbrate or any third party.
Data Untouched: Cell values, formulas and formatting are never changed. The add-on only adds, updates and removes its own images.
Gumroad Verification Only: The only external call sends your license key to Gumroad to verify it.

🛡️ Minimal Permissions

Requests only what the add-on needs:

Current Spreadsheet Only: Access is limited to the spreadsheet you have open, never all of your files.
No Drive Access: The add-on does not request Google Drive™ permissions.
Settings Stay in the File: Watermark settings are saved inside the spreadsheet; license status is stored in your private Google account storage.

Simple, Transparent Licensing

Try every feature for free. Activate a Gumroad license to remove the "-trial" mark.

Gumroad Product License

Free Trial + License

No time limit on the trial • Pricing & billing managed on Gumroad

✔ Free Trial Version: All features, no time limit. Watermarks include "-trial" (e.g. CONFIDENTIAL-trial).
✔ Licensed Version: Your watermark text exactly as you type it.
✔ Unlimited Sheets: Apply to as many sheets and spreadsheets as you need.
✔ Full Style Control: Color, opacity, rotation and font size.
✔ Live Preview: See the result on your own data before applying.
✔ Removal Always Free: Removing watermarks never requires a license.
✔ Multi-Device Access: Active wherever you sign in with your Google account.

⚡ Get a License on Gumroad Google Workspace Marketplace Download Link

Frequently Asked Questions

Everything you need to know about Watermark 4Sheets.

Will the watermark change my data or formulas? +

No. Watermark 4Sheets never writes to cells. It only inserts, updates and removes its own watermark image, so your values, formulas and formatting stay exactly as they were.

Is the watermark behind my cells, like a page background? +

No. Google Sheets™ has no native background watermark, so the watermark is a semi-transparent image placed over the grid. Because it is transparent, your data stays readable. Clicking on it selects the image, and you can drag it anywhere.

Will the watermark appear on every printed page? +

The watermark prints once, where it is placed. It does not repeat on every page. Use Show print area to see what will print, then drag the watermark where you want it before printing or exporting to PDF.

I applied a watermark but don't see it. What should I do? +

Google Sheets™ sometimes displays images added by add-ons only after the page is reloaded. Press F5 to refresh. Your watermark is already saved in the sheet.

Will removing the watermark delete my other images? +

Never. Every watermark created by the add-on carries a hidden marker. Remove and Update only act on images with that marker. Logos, charts and other pictures are left untouched.

How does the free trial work? +

The trial has no time limit and includes every feature. The only difference is that "-trial" is added to your watermark text (for example CONFIDENTIAL-trial). Activating a license removes the suffix from new watermarks. Click Update to refresh existing ones.

How do I activate my Gumroad license? +

After purchasing from Gumroad (numbrate.gumroad.com/l/watermark), copy the license key from your receipt. In Google Sheets™, go to Extensions → Watermark 4Sheets → 🔑 License & Activation (or open the License tab in the sidebar), paste your key, and click Activate license.

Can a watermark stop people from copying my spreadsheet? +

No. A watermark is a visual label, not a security control. Anyone with edit access can move or delete it, and it cannot prevent copying, downloading or screenshots. Use Google Sheets™ sharing permissions to control access.

Technical Support & Feedback

Have a question, feature request, or need help with license activation? We're here to help.

✉️ numbrate@gmail.com

Stamp Your Spreadsheets With a Clear, Diagonal Watermark