Free browser tools for online sellers in 2026: no sign-up, nothing uploaded

What a browser tool means, and how to check it

A browser tool opens as a web page and runs in the tab. You pick a file, the tab edits it, and you download the result. Nothing is uploaded, so there is no upload progress, no waiting for a server, and no account before the first edit. That sets the limit honestly: the tool can only work with the pixels you already have. It cannot invent detail or make a blurry label readable, and a tool that claims to do that is almost certainly uploading your file. One test helps: after the page has loaded, a true browser tool keeps working without a connection. Keep your originals, and check each download on your phone first.

Get listing photos to marketplace size

1. Free image resizer: free-image-resizer-online

Use it to resize a finished photo to the size a marketplace shows. Etsy recommends listing photos at least 2,000 pixels on both sides, with the first photo at least 635 pixels on both sides, and Amazon turns on zoom at 1,000 pixels on the longest side, so one export at about 2,000 pixels on the longest side covers most listings. Use Squoosh instead when you want to compare two quality settings side by side first. The limit applies to every resizer: shrinking a large photo is safe, but enlarging a small one cannot add detail.

2. Free image converter: free-image-converter

Use it when the photo is right but the format is wrong: a heavy PNG becomes a JPEG for a fast listing page, and a photo that needs transparency stays a PNG. Then check the file size, because an upload that stalls on a slow connection is usually a file-size problem. Use CloudConvert instead for a phone HEIC file, an unusual format, or a whole folder, accepting that the file is then uploaded. The limit is format, not quality: converting a JPEG to a PNG does not restore detail the JPEG already lost.

Brand the photo without opening a design app

3. Free watermark photos: free-watermark-photos

Use it to add a small logo or shop name to secondary listing images and social posts, so a screenshot still carries your shop with it. Keep it small so the product stays the subject, and never put it on an Amazon main image, where text, logos and watermarks are not allowed. Use Watermarkly instead when you must watermark a whole catalogue in one pass. The limit is honesty as well as effort: a watermark does not stop copying, it only makes a copy traceable, and a heavy watermark over the product costs sales.

4. Free product collage maker: free-product-collage-maker

Use it to show a set in one image: a bundle, a colour range, or the views a buyer asks about most, as one square a feed can show whole. It works best when every photo shares the same light and background. Use Canva free instead when you want styled templates and headline text laid out for you. The limit is the grid: a collage compresses each photo, so labels read worse than in the originals, and it should never replace the first, full-size product photo.

5. Free add background to PNG (coming soon): free-add-background-to-png

This tool is coming soon, and the link above points to its page, so check back rather than building a workflow on it today. When live, its job will be simple: take a transparent PNG cutout and place it on a solid colour, so a cutout made elsewhere becomes a usable listing or social image. Until then, use Photopea, a free browser editor, to place the cutout on a background layer yourself. The limit will still apply once it launches: a rough edge or halo from a bad cutout will show on the new background too. Our remove-background guide covers getting a clean cutout first.

6. Free product shadow maker (coming soon): free-product-shadow-maker

This tool is also coming soon, and its link above points to its page. When live, its job will be to add a soft shadow under a cutout, so a product photographed on white stops floating on a coloured background or in a collage. A small, soft shadow usually sells better than a heavy, dark one. Until it launches, use Pixlr in the browser to add a drop shadow layer by hand. The limit is light: a shadow falling the wrong way for the scene looks wrong faster than no shadow at all.

Get found away from the marketplace

7. Free QR code generator: free-qr-code-generator

Use it to make a QR code that sends a buyer from a physical thing to your shop: a thank-you card in the parcel, a market-stall sign, or a flyer. Point it at your shop home page or one collection, print it large enough to scan from a normal holding distance, and test it with two phones before you print a hundred cards. Use a dynamic QR service such as QR Code Generator instead when you need to change the destination later or count scans, because a plain browser QR code is fixed once printed. The limit is the link: a code pointing at a page that moves or loads slowly is a dead end.

8. Free YouTube banner maker: free-youtube-banner-maker

Use it to build a channel banner at the size YouTube shows. Upload at 2,560 by 1,440 pixels, under 6 MB, and keep every word and logo inside the centred safe area of 1,546 by 423 pixels, because that is the only strip every device shows: a phone crops the sides, a desktop crops the top and bottom, and only a TV shows the whole canvas. Put the shop name and one short line there, and treat the rest as decoration. Use Canva free instead when you want ready-made banner templates and stock backgrounds. The limit is the crop: text outside the safe area will be cut on a phone, however good the banner looks on your laptop.

The one job that is not a product photo

9. Free passport photo maker: free-passport-photo-maker

Use it for your own ID photo, not for a listing: a visa form, a marketplace identity check, or a seller profile that needs an official size. It crops a real photo you took to the size a document asks for, such as the US 2 by 2 inch square or the UK and Schengen 35 by 45 millimetre rectangle, without uploading your face to a server. Use IDPhoto4You instead when you need a printed sheet with several copies on one page. The limit is the source photo: it can crop and size, but it cannot fix bad light or a shadow on the face, and the issuing authority has the final word. Our passport photo at home guide lists the sizes and the home setup.

That order matters because the cheapest edit is the one you do once. Start a set with the Product Studio guide, then finish it with the tools above, and use the small-shop photo guide when the set still needs a new scene rather than a better export.