Jernej LeticaPhotography Tools & Stories
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Put your name or logo on your photos

Put your name or logo on one photo or a whole set: place it on the grid or by hand, set size and opacity, and save each photo at about its own size.

Built and written by Jernej Letica

Local browser processing No image upload No account required Up to 20 photos with one setting

How to add a watermark to photos

  1. Choose one photo, or up to 20 that should get the same mark.
  2. Type your text, or switch to Logo and choose a PNG with a transparent background.
  3. Tap a spot on the position grid, or tap and drag on the photo to place the mark by hand.
  4. Set size, opacity, colour and shadow, or repeat the mark across the whole photo.
  5. Download the photo. For a set, press Watermark all and save the ZIP.

Three of my photos with my name on them

I put "© Jernej Letica" on three photos I took myself: Lake Jasna below the Julian Alps at dusk, the painted boy figure at Metelkova, and a red children's bicycle against a graffiti wall. I left the page as it opens: bottom right, a quarter of the photo's width, 60% opacity, white with a shadow. On the 960 pixel wide lake photo the line of text came out 240 pixels wide. It sat on the pebbles under the clear water at the front and stayed readable without touching the reflection of the peaks.

What I watched most was the sky. Lake Jasna has a long, smooth evening gradient from pink to grey, the place where a photo saved again at a fixed 90% can show stripes. The watermarked copy kept the gradient as smooth as the original and was less than half its size.

File sizes from my runs

PhotoMarkOriginalWatermarked
Lake Jasna, 960 × 1200Text, bottom right424,970 bytes192,978 bytes
Lake Jasna, 960 × 1200Logo, bottom right424,970 bytes192,608 bytes
Lake Jasna, 960 × 1200Text, repeated424,970 bytes213,733 bytes
Metelkova figure, 1200 × 800Text, bottom right413,246 bytes96,853 bytes
Red bicycle, 1200 × 800Text, bottom right718,562 bytes287,326 bytes

All three originals were exported at a very high JPEG quality, and the page does not copy that setting. For each photo it tries a few qualities on a sample and keeps the lowest one that still looks like the watermarked picture. The blurred background of the figure photo needs little data, so that copy came down to under a quarter of the original. Repeating the text over the lake added 20,755 bytes, because the mark then crosses the detailed mountains as well. The three text copies together made a 577,675-byte ZIP.

Text or logo

Text is quickest: your name, your website or a copyright line. The page sets the font size so the text takes the width you choose, which keeps the mark the same on a phone photo and a 45-megapixel camera file. A logo needs a PNG with a transparent background; a logo on a white box puts a white box on the photo. Colour applies to text only, and the shadow works with both, following the outline of the letters or of the logo.

Where to put the mark

A corner mark is a signature. It tells people who took the photo and barely changes how it looks, but anyone can crop it off. Repeat across the photo is protection: the mark runs at an angle over the whole picture, so cropping cannot remove it. I use that only for proofs I send to clients before they choose. The position grid keeps the mark a small distance from the edges, and in a set every photo gets the same spot, measured from its own edges, so portrait and landscape photos both work.

File size and quality

Adding a mark means saving the picture again. A JPEG is saved at the lowest quality that still looks the same as the watermarked picture, and the check looks closely at smooth areas such as sky and skin, where blocks and stripes show first. On my three photos the copies came out between 23% and 45% of the original size. A PNG stays a lossless PNG, and HEIC and AVIF photos become JPEG. The copy carries no camera data or location.

Tips for better results

  • Start at 50-60% opacity: readable on light and dark parts, but not the first thing people see.
  • Keep the shadow on for white text; it holds the letters on a bright sky.
  • Check the mark on the smallest photo of a set, where the same share of the width is the fewest pixels.
  • Use a transparent PNG for a logo and trim empty space around it, so the size setting matches what you see.
  • Keep your unmarked originals; a watermark cannot be taken off again.

Privacy

Each photo and your logo never leaves your device. Every copy and the ZIP are made in your browser and saved straight from this page.

Frequently asked questions

Can I watermark many photos at once?

Yes, up to 20 at a time. Place the mark on the first photo and every other photo gets the same text or logo, size, position and opacity. Each one can be downloaded on its own, or all of them as one ZIP file.

Will the watermarked photo be larger?

Usually it is smaller. A JPEG is saved at the lowest quality that still looks like the marked picture, so my three test photos came out at 23% to 45% of their original size. A PNG stays lossless and can grow a little.

How do I add a logo with a transparent background?

Switch to Logo and choose a PNG that has transparency, such as one exported from your design program without a background. Only the visible parts of the logo appear on the photo, at the opacity you choose.

Can a watermark be removed?

A small mark in a corner can be cropped off or painted over by someone determined. A mark repeated across the whole photo is far harder to remove, which is why I use it for proofs and a corner mark for finished photos.

Are my photos uploaded?

No. The photos and the logo are opened and drawn in your browser, and the watermarked copies are saved straight from this page. Nothing about them is sent anywhere, and the page needs no account or sign-in.

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