SignetDrop

SignetDrop watermarks a batch of photos without uploading them

Drop the pictures in, set the mark once, and take one ZIP away. The work happens inside this page — the photos are never sent anywhere, so there is nothing to delete afterwards and nothing to trust us about.

1. Photos

No photos yet

What each marketplace's own page says: image sizes for Mercari, Yahoo Auctions, eBay and Etsy.

Drop photos here

JPEG, PNG, WebP and — where the browser can read them — HEIC.

    Nothing is uploaded. You can watch the Network tab while you use this.

    Want to see what a photo carries first? Check its EXIF and location Beta

    2. Settings

    Free version 30-day refund
    Watermark
    Colour
    Position
    Size and format

    The free version writes at most 2048px on the longest edge. Resize photos to 2048px for Facebook explains where that number is and is not documented.

    Canvas

    Padding and a set shape only ever add space around the photo. Nothing is cropped. Make Etsy listing photos square without cropping works through the settings on a batch, and Poshmark portrait photos does the same for the 3:4 shape.

    Names

    Template tokens: {name} {n} {n:3} {date} {time} {w} {h} {ext}. The extension always comes from the output format. Numbers follow the order the photos were added, and a photo that is skipped keeps its number, so the set has a gap where it was. Bulk resize and rename photos online works through each naming pattern with examples, and renaming product photos for Amazon the ASIN.PT01 one.

    EXIF

    Off by default, and that is the safe setting. EXIF can hold the place a photo was taken and the camera's serial number. Turned on, the EXIF block is copied across with a standard rotation tag reset to upright, its stated size and colour space set to match the new picture, and, unless you untick the box below, without its GPS fields, serial numbers or owner's name. Separate XMP and IPTC blocks are never kept.

    Both work only while the original EXIF is kept. Stripping GPS removes the GPS fields, the camera body and lens serial numbers and the camera owner's name, the small preview picture a camera embeds (it shows the photo without your watermark), every field text can be typed into — the caption, comments, keywords, title and subject — and the maker's private notes, whole and unread, and anything else in the block this tool has not read. What stays is the date, the camera and lens settings, and the fields that name a camera, lens, program or person, as written and not searched; one of those in a shape it should not have (text where a number belongs) is dropped too, and a rotation, size or colour field the tool cannot correct in place leaves that photo's block out. With Strip GPS on, EXIF laid out in a way this tool cannot fully follow is not kept at all, rather than kept with the location still in it. Unticked, the block goes across as it was apart from those three corrections, preview, captions and anything tucked inside it included. The name replaces the Artist and Copyright fields of photos that already have EXIF; a photo without any gets none added, and other fields that may name someone, such as the Windows author, are left as they are.

    JPEG in, JPEG out. EXIF lives in a different place in a PNG, a WebP or a HEIC, and this option does not read those or write them. A photo that is not a JPEG, or that you are saving as something other than JPEG, comes out with no EXIF — and the result says how many were in that position rather than leaving you to find out.

    Presets

    Presets stay in this browser. Export writes them to a file on your computer, to keep or to import in another browser; nothing is sent. A logo image is never stored — pick it again each session.

    3. Run

    Paid version — $29 once

    30-day refund, one per customer, if it is not what you needed.

    One payment of $29 USD, not a subscription. A year of updates; the version you have keeps working after that. Sold by Paddle, who handle the payment.

    Free: 10 photos at a time, up to 2048px on the longest edge, a text watermark or a logo, resize, format, numbering and suffixes. No name of ours on your photos, ever — free or paid.

    Paid adds — $29, one payment

    • Any number of photos, at any size
    • Text and logo together
    • Saved presets
    • Name templates like {date}_{n}_{name}
    • Padding and 1:1 / 3:4 / 4:3 / 4:5 / 16:9 / 9:16 canvases
    • Keep EXIF, if you want it kept (JPEG to JPEG; a photo whose EXIF cannot be corrected for the new picture comes out without it, and is counted)

    Paid does not

    • Send your photos anywhere: it runs in this page, like the free version
    • Read HEIC that this browser cannot open
    • Crop, or fill new space with anything but one flat colour
    • Keep EXIF in PNG or WebP output
    • Charge again: there is no subscription

    The key is saved in this browser, not in your receipt email — the receipt carries the transaction ID, and either one unlocks this.

    How it works

    Everything runs in the page. When you drop photos in, the browser decodes them one at a time, draws each onto a canvas with the watermark you set, re-encodes it, and puts the result into a ZIP that is built in memory. The ZIP is handed to you as a download from your own machine. No server sees the pictures because no server is involved.

    Which way up

    Phone photos are usually stored sideways with a tag saying which way to turn them. SignetDrop reads that tag itself and applies it, rather than trusting the browser to, because browsers disagree about the default. So the output is upright and the watermark is in the corner you chose. A site that turns photos itself has nothing left to turn: why WordPress renames a photo to -scaled.jpg covers that and what WordPress does to a large upload.

    What happens to EXIF

    By default, none of it survives. Output is drawn onto a canvas and re-encoded, and a canvas has nothing to say about where a photo was taken or what took it — no GPS, no camera serial, no timestamps. That is a consequence of how the tool works rather than a filter that might miss something. What the browser's encoder does write is generated for the new file — in Chromium, a JFIF header and an sRGB colour profile — and says nothing about you. The file names you keep and each file's date in the ZIP do come across. The paid version can carry the original EXIF across for JPEG output if you ask it to, leaving out the GPS fields, serial numbers and owner's name while "Strip GPS location" is ticked; a photo whose rotation, size or colour fields cannot be corrected for the new picture comes out without EXIF, and the run counts it. Remove location data from photos before selling online goes through what is in a phone photo and what comes off it here, and does resizing a photo remove EXIF data? covers why other tools answer that differently. Do Mercari, eBay and Etsy strip EXIF and GPS? reports what the marketplaces themselves say about it.

    What a watermark is and is not

    A visible watermark tells an honest person where a picture came from. It does not stop a determined one: it can be cropped, painted over, or removed by software made for the purpose. If a photo would cause you real harm if it were taken, a watermark is not the protection you need. We would rather say so than sell you a feeling. Some marketplaces also publish rules against marked listing photos: can you watermark eBay or Etsy listing photos? quotes what each of them says, and can you watermark real estate listing photos? does the same for an MLS. eBay photo requirements goes through the rest of what eBay asks of a listing photo, and getting a batch ready for it. Google Merchant Center image requirements covers the product feed, where a watermark gets an image disapproved. Etsy listing photo size and watermarks covers Etsy's size advice and why it steers sellers away from marks, and Instagram photo sizes and watermark placement covers keeping a mark readable once Instagram resizes or crops a photo. Amazon main image requirements goes through the white background and the 85% rule, and Poshmark, Mercari and Depop photo rules sets out what each of those apps says about shape, size and marks. Pinterest Pin image size and text overlay covers the 2:3 Pin and where text and a logo go, and OG image size for LinkedIn, Facebook and X covers the picture a shared link shows. Shopify product image size and watermarks covers the 2048 square and one shape across a store, and Facebook Marketplace and Craigslist photo sizes and privacy covers clearing a photo's location before a local sale. Does sharing a photo from your phone remove its location? covers what an iPhone share or a Google Photos download carries, and batch resize photos for the web without losing quality covers the size, the quality setting and JPEG or WebP. Zillow, Realtor.com and MLS listing photo rules covers what the portals allow on a listing photo, and watermark, copyright notice or metadata covers which of the three does what for your own photos. Airbnb and Vrbo listing photo rules covers the size and shape a rental listing needs, and car listing photos on Autotrader, Cars.com and Facebook covers selling a car without giving away where you live. StockX, GOAT and Grailed photo requirements covers sneaker and streetwear photos, and photo timestamp and camera model in EXIF covers what the date and the phone in a photo tell a buyer. Watermark placement and size for marketplace photos covers where a mark is hard to crop off without hiding the item, and photo EXIF on X, Instagram, Facebook and WhatsApp covers what each service says about the location in a photo you post.

    Questions

    Are my photos uploaded?

    No, and you can check rather than take our word for it: open the developer tools, switch to the Network tab, and run a batch. Nothing from a photo goes out. The only requests are this page's own files and an anonymous counter carrying how a batch ended, how many photos were in it, and which format. Privacy lists every one of them. If you are weighing this up across batch-watermark tools generally, how to watermark multiple photos without uploading them covers what travels with a photo and how to check a claim like this one.

    Is there a limit on file size?

    Not one we impose. The practical limit is your machine's memory, and photos are handled one at a time to keep that as low as it can be. Very large batches take a while; the page tells you where it is and you can stop it.

    Why is HEIC sometimes refused?

    HEIC can only be decoded by browsers that ship a decoder. Apple says Safari 17 added HEIC support; Chromium and Firefox did not open our test file. Where the browser cannot read it, SignetDrop lists the file as skipped rather than quietly producing nothing, and the rest of the batch is still done.

    My iPhone photos are HEIC. How do I get them in?

    Try Safari 17 or later: Apple says it supports HEIC. In other browsers, use JPEG copies. On an iPhone, open Settings › Camera › Formats and choose Most Compatible, and new photos are taken as JPEG. For photos you already have, open them in Photos or Preview on a Mac and choose File › Export, then JPEG. Apple describes both steps in Using HEIF or HEVC media on Apple devices.

    If I buy, does it stay unlocked? What about another computer?

    Yes. The key is saved in this browser, so the paid version is still here tomorrow, next month, and offline — there is no account and nothing to log in to. It only goes away if you clear this site's data, use a different browser, or open a private window. To get it back, paste either your key or the transaction ID (it starts with txn_ and is in the receipt email Paddle sent you) into the box under Paid version. The same key works on as many of your own machines as you like.

    What does the paid version check?

    A licence key with a signature on it. The check happens in your browser and never touches the network, so it works offline and keeps working if our licence service is down. Once a month, if you are online, the page asks whether the key has been refunded.