One edge, or two
Set the width alone and the height follows, so the shape is preserved and nothing is cut. Set both and you have asked for a box, which means choosing whether the picture is padded, cropped or stretched to fill it.
Resize
Resize an image to the exact pixels they asked for.
Type two numbers, or pick the marketplace rule by name. The photo is resized on this device and comes back at full quality.
No model to downloadNothing uploadedFull resolution
The short answer
To resize an image, add the photo, set the width or the height in pixels, and download the result. Leaving the proportion lock on keeps the shape and stops anything being cut. The work runs in this browser tab on your own device, so nothing is uploaded, the export carries no watermark, and the file you get back is the size you asked for.
Resize a photo now
Drop a photo, click to browse, or paste one from the clipboard. The width and height fields open on the picture’s own dimensions, and the preset chips fill them with the size a platform asks for.
Before
Presets
Size by
Add a photo first.
Checking what this device can do. Nothing is uploaded.
Add a photo and run the tool. The download appears here.
Try another tool on the same photo
The short version
What to know before you start
A resize is one of the two things an upload form can complain about, and it is the one written in pixels. “At least 1600 on the longest side” is a resize. “Under 5 MB” is not: that is a compression job, and running one at the other is the most common wasted afternoon in this whole category.
The arithmetic is simple and the judgement is not. Setting one edge and letting the other follow keeps the picture honest. Setting both edges forces a decision about what happens to the difference, and the three answers, pad it, crop it or stretch it, are not interchangeable. Stretching a product photo to fit a square is visible from across a room, and on most marketplaces it is against the rules.
Shrinking is safe, growing is not
Fewer pixels is a clean operation. More pixels on a canvas is guesswork, and it looks like guesswork. Growing is switched off by default; the upscale tool adds detail with a model instead, which is a different job.
Pixels and bytes are different rules
A dimension rule and a file size rule come from different parts of an upload pipeline. Read which one you were given before you pick a tool, and check the rejection message rather than guessing.
Work at full size, shrink last
Every edit you make is better done on the biggest version of the file you have. Resize at the end, once the cut-out, the crop and the colour are settled, and the edges stay clean.
Presets are checked specs
The chips above are the canvas sizes the platforms publish, not folklore. Specs do change, so treat the chip as a fast start and the platform's own help page as the authority on the day you upload.
It runs where you are standing
There is no queue and no round trip, because the browser's own graphics code does the drawing. That is also why the resize finishes in the time it takes to read this sentence.
Step by step
How do you resize an image?
Five steps, and the whole thing happens inside this page. Nothing is sent anywhere and there is no account to make.
- 1
Add the photo
Drag a file onto the panel, click it to browse, or paste an image from the clipboard. The tool reads the file and shows its real dimensions, with any camera rotation already applied.
- 2
Choose a preset, or type the numbers
Pick the platform rule by name from the chips, or type a width in pixels. With the proportion lock on, the height fills itself in and the shape is preserved.
- 3
Decide what fills the box
If you set both edges, choose whether the picture is fitted inside and padded, cropped to fill, or stretched. Marketplace rules almost always mean fitted inside on white.
- 4
Run it
Press the resize button. The work happens on this device, in a background thread, so the page stays responsive even on a large photo.
- 5
Check and download
The plate shows the result and the readout gives the exact output dimensions and file size. Rename it if you like, then download. The file goes straight to your downloads folder.
What size should the image actually be?
Take the number from the place that rejected you. Marketplaces publish a minimum longest edge because that is what enables zoom on the listing page; social platforms publish an exact canvas because their layout is fixed. The two kinds of rule want different settings here, and mixing them up produces a file that is technically correct and still refused.
A minimum is a floor, so resizing up to meet it defeats the point: the platform wanted more real detail, not more pixels. If your photo is genuinely below the floor, the honest fix is a better source file, or the upscaler when the original is small but sharp.
An exact canvas is a box, so the question becomes what happens to the shape difference. Padding on white is the safe answer for anything commercial. Cropping to fill is the right answer for a banner, where the frame matters more than the edges.
Does resizing lose quality?
Going down, barely. The browser resamples with a filtered downscale, and below about a quarter scale this tool halves the image in stages rather than jumping straight to the target, which is what keeps text on a label and the weave in fabric from turning into aliasing. That step-down is the difference between a thumbnail that reads and one that shimmers.
Going up, a great deal. There is no information between two pixels for a canvas to recover, so enlarging is interpolation and it looks soft. That is a property of the operation rather than of this tool, and it is why the option is off unless you turn it on deliberately.
Format matters too. Resizing a JPEG means decoding and re-encoding it, which costs a small amount of quality on every pass. Do your resize once, from the original, rather than resizing a file you already resized.
What do the three fit modes do?
Fit inside places the whole picture in the box and fills the leftover space with the background colour. Nothing is lost and nothing is distorted, which is why it is the default for anything going to a marketplace.
Fill the box scales the picture until it covers the box and trims the overflow from the edges, centred. Use it for banners and covers where the frame is the point.
Stretch forces both edges to the numbers you gave, whatever that does to the shape. It is here because occasionally a spec genuinely wants it. Most of the time, choosing it is a mistake you can see.
| Property | Detail |
|---|---|
| Input formats | JPG, PNG, WebP, AVIF, GIF, BMP. HEIC where the browser can decode it. |
| Output formats | The same format as the input, or JPG, PNG, WebP and AVIF on request. |
| Maximum size | Bounded by the browser canvas limit of 16384 pixels an edge, and by device memory. |
| Resize modes | Exact pixels, percentage, or longest edge. |
| Fit modes | Fit inside with padding, fill and crop, or stretch. |
| Rotation | EXIF orientation is read and applied before the resize, so portraits stay portrait. |
| Model download | None. This is a canvas operation, so the first run is as fast as the tenth. |
| Where it runs | In this browser tab, on your device, in a background thread. |
| Export limits | Full resolution, no watermark, no credit counter. |
Slide the table sideways to see every column.
Worth avoiding
Where this usually goes wrong
Resizing when the complaint was file size
An upload that fails at 8 MB fails because of bytes. Shrinking the dimensions usually shrinks the bytes too, so it looks like it worked, but you have thrown away resolution you did not need to lose. Compress to the byte target and keep the pixels.
Enlarging to meet a minimum
A platform asking for 1600 pixels wants 1600 pixels of real detail. Blowing a 600 pixel photo up to 1600 passes the check and looks worse on the listing than the small original did.
Stretching a product into a square
Setting both edges without thinking about fit is how a bottle ends up wide. Fit inside on white gives you the square canvas the rule wanted and leaves the product the shape it is.
Resizing a file you already resized
Each JPEG round trip costs a little. Go back to the original and resize once, rather than stacking edits on an export of an export.
Resizing before you crop
Cropping after a resize throws away pixels you just spent quality preserving. Frame it first, then set the final size.
Trusting a spec you read somewhere else
Platform requirements change without much announcement. The presets here are checked, but on the day you upload, the platform's own help page is the authority.
Questions
What people ask about this tool
Every answer is in the page source, so a reader and an answer engine get the same words.
Does resizing an image reduce its file size?
Usually yes, because there are fewer pixels to store, but it is a side effect rather than a control. If the rule you are trying to meet is written in megabytes, use the compressor: it re-encodes until the file fits and leaves the dimensions alone. Use the resizer when the rule is written in pixels.
Will resizing make my photo blurry?
Making a photo smaller keeps it sharp, and below about a quarter of the original size this tool halves the image in stages so fine detail survives the trip. Making it larger on a canvas cannot invent detail, so it softens. That is why growing past the original size is switched off by default here.
How do I resize an image without cropping it?
Leave the proportion lock on and set one edge. The other edge follows, so nothing is cut. If a platform demands both edges and your photo is a different shape, choose fit inside: the picture is placed whole inside the box and the gap is filled with the background colour you pick.
What size should a product photo be?
Most marketplaces want a square between 1600 and 2048 pixels on a side, with the product filling most of the frame. Amazon asks for at least 1600 pixels on the longest side to enable zoom, Etsy recommends 2000, and Shopify handles up to 2048 well. The presets above cover those three.
Can I resize several photos at once?
Yes. The batch tool runs the same resize over a queue of files, one at a time, and hands back one file per file in. It is the same engine and the same options, pointed at a folder instead of a photo.
Is there a maximum image size this handles?
Your device sets the ceiling rather than a plan does. Browsers cap a drawing surface at 16384 pixels on an edge, and memory runs out before that on a phone. Photos from a phone or a full-frame camera are routine, and the export comes back at the size you asked for with no watermark.
Does the photo get uploaded to a server?
No. The file is read from disk into this tab's memory, resized by the browser's own graphics code, and written back out as a download. There is no upload step, which is also why the tool keeps working once the page is open and you lose your connection.
The rest of the toolbox is one tab away.
Crop to a ratio, hit a file size limit, change the format, or point the same settings at a whole folder. Every one of them runs on your device and keeps the resolution you brought.
Keep reading
Where to go next
Platform image rules
Image size, file type and background rules for 22 selling platforms, each one sourced.
Read itCrop image
Ratio chips, a draggable box and exact numbers when you need them.
Read itCompress image
Name a file size limit and the tool re-encodes until the photo fits it.
Read itBatch edit
Queue a folder and run one resize, crop, compress or convert across all of it.
Read it