Add watermark to PNG Portable Network Graphics Free Online Secure
Pick a word, and it is painted across the picture at the angle and weight you choose. Nothing is resized, and nothing is uploaded.
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Where the watermark comes from
The watermark is one of the oldest marks of authorship still in use. Papermakers in Fabriano, in Italy, began around 1282 to twist wire into a shape and fix it to the mould: where the wire sat, the pulp settled thinner, and the mark appeared when the finished sheet was held up to the light. It identified the mill, dated the batch, and eventually guaranteed the banknote. The digital watermark keeps the purpose and reverses the method: instead of thinning the sheet, it lays a faint mark over the page. It is the same promise — this came from us — made visible in the opposite way.
Where you need it
A draft that must not be mistaken for the final version; a photograph sent to a client before the invoice is paid; a contract circulated for comment; an internal document that would embarrass somebody if it were forwarded; a scan of a passport or a bank statement sent to an agency, marked with the purpose so that it cannot be reused for another. That last one is the case where a watermark does the most good for the least effort.
Questions people ask
Can a watermark be removed?
Yes, by anyone determined enough. A visible watermark sits on top of the image, and software can be used to paint it out — crudely in a few seconds, convincingly with more patience. It is a deterrent and a label, not a lock. Its real work is to make casual misuse obvious and deliberate misuse something the person has to decide to do, which is enough for most purposes but is not protection and should never be relied on as such.
Where should the mark go, and how faint?
Across the middle, at an angle, and faint enough to read through. A mark in a corner is cropped away in one gesture; a mark across the centre cannot be removed without damaging what it covers. On a document, light grey at around a fifth of full strength leaves the text perfectly readable while being impossible to overlook. On a photograph where the point is the copyright, a little stronger is reasonable — the picture is being shown, not sold.
Does the file lose quality?
It depends on what the two formats can hold. Converting between formats that store the same thing — a PNG to a BMP, a WAV to a FLAC — loses nothing. Converting into a format that throws information away to save space, such as JPEG or MP3, loses a little every time, and converting back does not bring it back. Where a choice exists, this page errs towards keeping the original quality rather than making the smallest file.
Is my file uploaded anywhere?
No. The conversion happens inside your browser, on your own machine; the file never leaves it and there is no server here that could receive it. That is why a large file is limited by your own memory rather than by an upload, and why nothing you convert can appear in anybody's logs — including ours. The audio and video tools do fetch their conversion engine from this site the first time you use them, some thirty megabytes once; after that the work still happens entirely on your machine.
Why people add a watermark to a PNG
PNG is the format of screenshots, diagrams, charts, logos and clean graphics, and those are exactly the pictures people most want to protect from casual reuse. A designer sends a mock-up to a client. A teacher shares a worksheet as an image. A company posts an infographic. A shop publishes a size chart. Each of these can be copied in a second and reposted without credit. A watermark, a word or name painted faintly across the picture, is the standard way to say whose it is. That is why people want to add watermark to PNG files: it is quick, it travels with the image and it needs no special software.
A mark also does a job beyond ownership: it labels. DRAFT tells a viewer that a mock-up is not final. SAMPLE says a chart is a preview. A client's name shows that a copy was made for them. Whatever the word, the mark turns a plain picture into a picture that says something about itself, and that is often exactly what is needed.
This page lets you add watermark to PNG files entirely in your browser. The picture is not uploaded to a server, which matters for unreleased designs, client work and private screenshots. Below you will find how the stamp is painted, what is kept, what the mark cannot do and how to get a mark that is visible without ruining the picture.
How the stamp is painted
One word, at the angle and weight you choose
You type a word or short phrase, and it is painted across the picture at the angle and weight you choose. A diagonal mark is traditional because it is harder to crop out than a mark in a corner. A heavier weight is more visible; a lighter one is more discreet. Use the preview to find the balance for your picture.
Nothing is resized
When you add watermark to PNG files here, nothing is resized or cropped. The picture keeps its exact dimensions, and every pixel outside the stamp is kept as it was. The only change is the mark itself, painted over the picture.
Why PNG suits a watermark
PNG stores every pixel without discarding anything, so the parts of the picture around the stamp stay exactly as sharp as they were. There is no extra loss of detail from saving, which is a real advantage over JPG for graphics with small text and thin lines. When you add watermark to PNG files, the picture beneath the mark is as crisp as the original.
What is kept
Dimensions and resolution
The exact dimensions of the picture are kept, and so is the resolution the file records, the dots per inch it is meant to print at. A graphic meant to print at a certain size still does so after you add watermark to PNG files here.
Everything outside the lettering
Colours, lines and text are kept everywhere except under the letters. The picture is recognisably the same, which is the point: a watermark should mark a picture, not replace it.
What a watermark cannot do
The stamp becomes part of the picture
This is the most important thing to understand. When you add a watermark to a PNG, the stamp becomes part of the picture. Unlike a watermark on a PDF, which is a separate layer that can be lifted off later, there is no layer here. The pixels under the letters have been changed. So keep the original: it is the only clean version you will have.
It is not protection
A watermark marks ownership; it does not lock anything. Anyone can crop it out, clone it away with an editing tool or paint over it. Treat it as a deterrent and a label, not as a safeguard. For a screenshot or a diagram, where the background is flat, a mark is particularly easy to remove, so place it across the content, not in empty space.
Making a mark harder to remove
Put the mark across the middle of the picture, where cropping would ruin it, use a diagonal angle and choose a weight that is visible without being overpowering. On flat backgrounds, a mark that crosses the content is far harder to remove than one that sits on blank space. The trade-off is intrusiveness, so choose to suit the purpose.
Choosing a good watermark
Keep it short
A name or one or two words are visible at a glance. A sentence is not. Short marks are bolder and cleaner.
Match the message to the purpose
DRAFT for unfinished designs, SAMPLE for previews, a client's name for personalised copies, your own name for ownership. A clear word means the viewer never has to guess.
Use any alphabet
The stamp is drawn with the fonts on your device, so you can use a name in Latin, Cyrillic, Arabic, Chinese or another script, as long as your device can display it.
What a watermark on a PNG really is
On a picture, a watermark is simply some pixels whose colour has been changed to spell a word. Nothing is hidden and nothing is separate: after you add watermark to PNG files, the picture is a different picture, with the letters baked into it. That is both its strength and its weakness. It travels with the image wherever it is copied, shared or saved again, which makes it a dependable label. But it also means there is no switch to turn it off, so you must keep the clean original.
If your work is a document rather than a picture, such as a PDF of a proposal, the situation is different. A PDF watermark is a separate layer, drawn on top of the page, and the page beneath stays as it was. A PNG has no layers: the mark and the picture are one. Knowing the difference helps you decide where to put the mark: on the picture, early, for pictures that travel alone, or on the document, late, for pictures that live inside one.
Marking graphics versus photographs
A graphic with flat colours and sharp edges shows a watermark very clearly, because the lettering contrasts with large uniform areas. A photograph, full of texture, hides a faint mark more easily. When you add watermark to PNG files that are graphics, a lighter weight is usually enough; for busy pictures, go heavier. The preview tells you at once.
Placing the mark so it does its job
Position matters more than size. A mark in a corner is the easiest to remove, by cropping. A mark along an edge may be cut off. A mark across the middle, at an angle, cannot be removed without damaging the picture. For screenshots and charts, put it across the area where the information is, so that cropping or painting it out would also damage what the viewer wants to see.
Colour is automatic, but contrast is something you can judge: a mark must be readable against both the light and the dark parts of the picture. If the picture has strong variation, choose a middle weight that shows on both, and check the preview before you commit. When you add watermark to PNG files with dark backgrounds, such as dashboards and dark-mode screenshots, check especially that the mark is visible.
Diagonal marks and text size
A diagonal mark naturally covers more of the picture and is harder to ignore. A horizontal one is easier to read. For previews that must be clearly marked, go diagonal; for pictures where legibility of the content matters more, a gentler angle and lighter weight keep the mark discreet.
Marking a whole set
When you have many pictures to mark, such as a set of mock-ups or a series of charts, add watermark to PNG files one at a time with the same word, angle and weight, so the whole set looks consistent. Try one first, check it at full size and then do the rest. Keep the originals in a separate folder, named clearly, so that you never send a clean file by mistake.
Name the marked files so they are easy to tell from the originals, for instance by adding the word preview to the file name. When you deliver the final pictures, you will send the clean versions; when you share previews, the marked ones. Keeping the two sets apart is the single most useful habit for anyone who marks pictures regularly.
Reducing the size first
If you only want to show a picture on screen, you can reduce its resolution first with the PNG compressor. A smaller marked picture is less useful to anyone who wants to print or reuse it, which adds a second layer of discouragement to the mark itself.
How to add watermark to PNG files here
Add your picture
Drop the PNG onto the page or pick it from your device. It is read inside your browser and is not uploaded.
Choose the word, angle and weight
Type your word and set the angle and weight. Check the preview to see how visible the mark is against the picture.
Stamp and check
Press the button and download the marked picture. Open it at the size it will be seen and check that the mark is readable but does not spoil the picture.
Questions people ask before adding a watermark
Can I remove the watermark later?
No, not from the marked file. The stamp becomes part of the picture. Keep the original.
Can someone else remove it?
With effort, yes. A watermark marks ownership; it does not protect the picture.
Will the quality drop?
No further loss: PNG is lossless. Everything outside the stamp is exactly as it was.
Is my picture uploaded?
No. Everything runs in your browser and the picture never leaves your device.
Who adds watermarks to PNG files
Designers and agencies
Mock-ups and proofs carry a mark such as DRAFT or the agency's name, so they are not used before approval or payment.
Teachers and content creators
Worksheets, infographics and diagrams shared as images carry the author's name, so credit travels with them.
Businesses and shops
Charts, price lists and product graphics marked with the business name discourage reuse by others.
Common mistakes
Losing the original
The mark cannot be undone. Always keep the clean original.
Placing the mark on empty space
On flat backgrounds it is easy to remove. Run it across the content.
Treating the mark as security
It can be cropped or painted out. Use it as a label.
Related tools
To mark photographs, add watermark to JPG, and to mark documents, add watermark to PDF, where the stamp is a separate layer. To make the marked picture lighter, compress PNG, and to turn it upright first, rotate PNG. To put marked pictures into a document, use PNG to PDF, and to get a photo-sized file, PNG to JPG.
When to add watermark to PNG files, and when not to
A mark is right when a picture is going out as a preview, a proof, a draft or a shared graphic and you want your name on it. It is the wrong move for a picture that must look perfect, such as a final delivery, a logo for a client who has already paid or a graphic for print. And it is not a substitute for protection: if a picture is truly valuable, share only small versions, or share it in a way that controls who can see it.
For the common cases, such as mock-ups, infographics, screenshots and price charts, it is quick, private and effective to add watermark to PNG files in the browser. Your original is never changed, so you can come back and add watermark to PNG files again with a different word or weight whenever you like.
Large pictures and slow devices
Everything runs on your own device, so very large pictures depend on its memory. A typical screenshot is no trouble for a modern phone or computer. A very large poster-sized PNG may be slow on an older device. If it struggles, give the browser a moment and avoid switching to other apps while it works.
Checking the result properly
After you add watermark to PNG files, open the result at the size it will be seen. Check that the mark is readable, that it does not cover the most important part of the picture and that small text beneath it is still legible. If the mark is too faint or too heavy, go back to the original and try again with a different weight.
A simple routine to add watermark to PNG files well
Choose the word and keep it short. Add watermark to PNG files one at a time, from the original, using the preview to set angle and weight. Download the result and check it at the size it will be seen. Send or publish the marked version, and keep the clean original in a separate folder. This routine takes a minute, and it works whether you add watermark to PNG files once a month or every day. If you add watermark to PNG files in batches, use the same settings for the whole set, and check one picture at full size before you do the rest.
Your picture stays on your device
The stamping happens locally. Your picture is read by your own browser, marked there and handed back. Nothing is uploaded, so there is no copy on a server and no one else who could see it. For unreleased designs and private screenshots, that is the safe way to add watermark to PNG files.
A worked example
Say you have designed an infographic and want to share a preview with a prospective client without giving away the finished artwork. You drop the PNG here, type PREVIEW, choose a diagonal angle and a medium weight and check the preview. You press the button and download the marked picture. The client can see the design clearly with the word across it, and your clean original stays on your computer for the final delivery.
A closing word
The best watermarks are noticed and then forgotten: visible enough to tell people whose picture it is, discreet enough that the picture still does its job. If your picture is a photograph rather than a graphic, you may prefer the JPG version of this tool, and if your picture is going to live inside a document, marking the finished PDF is often neater. A minute of care here protects your name for as long as the picture circulates, and it costs nothing in quality, because PNG keeps everything outside the lettering exactly as it was.
Before you close the page
Check that you downloaded the marked picture, that the mark is visible but does not spoil the picture, and that you kept the clean original.
Summary
To add watermark to PNG files here, drop the picture, type a word, choose the angle and weight and download the result. Nothing is resized, and every pixel outside the stamp, the exact dimensions and the recorded resolution are kept. The stamp becomes part of the picture, so keep the original, and it is not protection: anyone can crop, clone or paint it out. It marks ownership; it does not lock anything. Nothing leaves your device.