How do you date stamp photos on Android, including photos you already took?
Short answer: you can, but the date has to come from somewhere. The camera's own watermark setting only works for photos taken after you turn it on. For photos already in the gallery you have two options: type the date yourself with an editing tool, or use an app that reads the date, time and location from the photo file and prints them on the image.
The second option is the useful one, with one condition: the stamp should say that the values came from the file, not from the camera at the moment of capture. A date in a file can be missing, wrong, or edited. A stamp that hides that is worth less than no stamp.
Option 1: the built-in camera watermark (new photos only)
Samsung's Camera app has a Watermark setting: open the Camera, tap Settings, tap Watermark, turn it on, and turn on "Date and time." You can also show the phone model name. Samsung says the watermark is applied to new photos after the feature is enabled; it does not go back and stamp old ones. Availability depends on the device and software version. Other Android makers have similar settings under different names, and some built-in cameras have none.
So if your question is "how do I stamp the photos I took last week," this setting won't do it. It's still worth turning on for the next job.
Option 2: type the date on the photo
Any gallery or photo editor with a text tool lets you write "Oct 15, 2026, 2:40 PM" on the picture. Google Photos, Samsung Gallery and most editors can do it.
The problem is obvious: you typed it. Nothing about that text is connected to when the photo was taken. For a photo you'll show a client or an adjuster, a typed date is a claim you're making, and it looks like one.
A related trap: Google Photos lets you change the date and time of a photo from its details panel (swipe up on the photo, tap the edit icon next to the date). That changes what Google Photos shows. It's convenient for fixing a wrong camera clock, and it's also the reason a date shown in a gallery app isn't proof of anything by itself.
Option 3: an app that reads the date from the file
Every phone photo carries EXIF metadata: the date and time the shutter fired (DateTimeOriginal), the time zone offset on newer files, and GPS coordinates if location was on when the photo was taken. An app can read those fields and print them in a band on the image. That's what a timestamp camera app does when you pick photos from the gallery instead of shooting new ones.
Three things to know before you rely on it:
- The date may be missing. Screenshots, photos received by WhatsApp or text message, and images saved from the web usually have no original date. The app then has nothing to read. A good app says so instead of printing today's date.
- The location may be gone even if the date is there. Since Android 10, apps that don't hold a special media-location permission receive photos with the GPS fields removed, and the system photo picker hands over photos the same way. If you pick a photo and the stamp shows no coordinates, that's often why, not because the location was never recorded.
- The stamp should name its source. "Time: from photo file" means something different from "Time: phone clock, checked against a time server at capture." Both are honest. Mixing them up is not.
What a later stamp can and cannot say
| Stamp added… | Where the date comes from | What it can honestly claim |
|---|---|---|
| At capture, by a timestamp camera | Phone clock at the moment of the shot, ideally compared with network time; GPS fix at that moment | This is when and where the photo was taken, with the clock check and GPS accuracy shown |
| Later, from the file | EXIF fields written by whatever camera took it | This is what the file says; the file could have been edited before stamping |
| Later, typed by hand | You | Nothing beyond "the person who sent this says so" |
None of these is a forgery test. Pixels can be edited, and so can EXIF. The point of a visible stamp is that the reader sees the date without digging into file properties, and that the stamp tells them how much to trust it.
Step by step: stamp old photos without hiding where the date came from
- Check that the photo still has its date. In Google Photos, swipe up on the photo. If the details show the original date and the camera model, the EXIF is there. If the date shown is the day you received the file, it's gone.
- Keep the original. Stamp a copy. Don't let the app overwrite the file you have.
- Pick the photos in an app that reads EXIF and prints the date, time and (if present) location on a band below the image, with a note that the values were read from the file.
- Add what the file can't know. The address, the job name and a note about what the photo shows. Type them, and let the stamp mark them as typed.
- Put the series into one PDF with each photo's date, location and source underneath, so the reader gets everything in one file instead of ten loose images.
If the photos are for a dispute or a claim
Send the original files too, not only the stamped copies. The stamped copy is for reading; the original is what someone can check. And don't backdate anything: a stamp that says "from photo file" on a photo you took today, with today's date, is fine. A typed date from last month on a photo you took today is a problem you don't want.
Questions people ask
Can I add a timestamp to photos I already took on Android?
Yes, but the date has to come from somewhere. You can type the date yourself with any gallery or photo editor text tool, or use an app that reads the date, time and location from the photo file's EXIF metadata and prints them on the image. The stamp should say that the values came from the file rather than from the camera at the moment of capture.
Does the Samsung Galaxy camera have a date stamp?
Yes, for new photos. Samsung's support page says to open the Camera, tap Settings, tap Watermark, turn it on, and turn on "Date and time"; the model name can be edited. Samsung adds that availability varies by device and software version, and that the watermark is applied to photos taken after you enable it.
Does the Samsung camera watermark work on old photos?
No. Samsung's Watermark setting, found under Camera settings with a Date and time option, applies only to new photos taken after you turn it on; it does not go back and stamp photos already in the gallery. Availability also depends on the device and software version, and other Android makers have similar settings under different names.
Why does the location disappear when I stamp a gallery photo?
Since Android 10, apps that do not hold a special media-location permission receive photos with the GPS fields removed, and the system photo picker hands over photos the same way. So a stamp with no coordinates often means the app was not given the location, not that it was never recorded. The date can still be present even when the location is gone.
Is a typed date on a photo worth anything?
Nothing about typed text is connected to when the photo was taken, so for a client or an adjuster it reads as a claim you are making. A date read from the photo file is different because it was written by whatever camera took the picture, although the file could have been edited before stamping. Whichever you use, keep the original file, stamp a copy, and never backdate anything.