Resize a whole folder of images at once
Drag the folder onto Images by Edmund, choose a size from the size menu and press Export. The setting applies to everything in the window at once, so fifty photos take the same number of clicks as one. You can keep the format they already are, or change it in the same pass.
macOS 15 or later. Apple silicon Mac. Version 1.1.0, out 11 October 2026. What’s new.
Free, with nothing to unlock and no account.
Do a few right here
Drop up to 30 images in, choose a size, and get them back as one zip. It happens in this tab, on your own machine: nothing is uploaded, there is no queue because there is no server to queue for, and the limit is your own memory rather than somebody else’s bandwidth bill.
Good, and usually a decent saving
This applies to whichever files in the batch have a quality to set. A PNG has none, so it comes out the same whatever this says.
Bulk resizing, step by step
- Drag the folder inFolders expand to the images inside them, so you do not have to select the files yourself. Mixed formats are fine; they can all take the same size.
- Choose a sizeHalf, quarter, a longest edge, or a width you type with the height worked out for you. Pick the one that matches how you think about the job.
- Press ExportWrite the results beside the originals, into a folder you choose, or over the originals. That last one puts the old files in the Trash rather than deleting them.
It will not scale a photograph up, and it turns before it resizes
Two rules do most of the work here. The first is that a bitmap is never enlarged. Ask for a width bigger than the file really is and you get the file at its own size rather than a soft, stretched version pretending to be sharper than the original, which is what makes bulk resizing tools quietly ruin archives. Vectors are exempt, because there is nothing to invent. The second is the order of operations: when you have asked for both a rotation and a fit within a box, the rotation happens first. Otherwise a portrait box gets measured against a landscape picture and the result is the wrong size in a way that is very hard to spot in a folder of two hundred. The batch also runs several files at once, bounded by your processor count and memory rather than fixed, so a big folder uses the machine you have.
Why not just use a converter website?
There is a resizer on this page and it works, so the honest answer is: for a handful of files, do that. It caps out at thirty because the work is happening on your own machine in one browser tab, which is a real limit rather than a commercial one.
What the other sites are doing is different in kind, and it is the upload. Your folder goes to somebody else’s computer, gets resized there, and comes back. That is why they cap you, queue you and meter you: every file costs them bandwidth twice, so the free tier exists to be too small.
Resizing is usually the last step before publishing, which means the folder is full of the final versions of things: client work, product shots, photographs of people. Sending all of it to a third party to save a few clicks is a poor trade, and it is the one thing neither this page nor the app asks you to make.
Questions
Will it make small images bigger?
No, and that is deliberate. Asking for 2000 px when the file is 800 px gets you the 800 px image rather than a blurred enlargement. If you genuinely want an upscale, that is a different tool doing a different job.
Can I resize and change format in one pass?
Yes. The format menu and the size menu are independent, so converting a folder of HEIC photos to 1600 px JPEGs is one setting each and a single Export.
What does longest edge mean?
It caps whichever side is longer and scales the other to match, so landscape and portrait images in the same folder all end up within the same bounding size without you sorting them first. It is usually what you want for a gallery.
Can I overwrite the originals?
Yes, choose Replace the originals. The previous versions go to the Trash rather than being deleted, so a mistake is recoverable for as long as you have not emptied it. The App Store version asks once for permission to save in each folder, unless you dragged in the folder itself, and remembers it after that. And it will not replace a file it would lose something from, such as a PDF or TIFF with several pages, an animated GIF, or an icon file holding several sizes. That card says why, and the original stays exactly where it was.
Other things it does
There is a full list on the Images by Edmund product page, along with what else the app does.
Get Images by Edmund.
Free, and it does the other eight jobs too. Two ways to get it when it lands: the Mac App Store, or straight from here.
macOS 15 or later. Apple silicon Mac. Version 1.1.0, out 11 October 2026. What’s new.