Best Free Bulk Image Resizers: BIRME vs Bulk Resize Photos vs BulkImagePro

Last month I needed to resize 280 product photos for a friend’s eBay store. She’d shot everything on her phone at full resolution — 4032x3024 pixels each — and needed them all at 1600x1600 for the listings. Not complicated. Just tedious if you’re doing them one at a time.

So I did what anyone would do: I went looking for a bulk resizer. And I quickly realized there are three tools that keep coming up in every recommendation thread, every “best free tools” roundup, every subreddit answer. BIRME. Bulk Resize Photos. And our own BulkImagePro.

I’ve used all three extensively at this point. Not just for that one eBay batch, but for client work, personal projects, testing edge cases — the kind of obsessive comparison that probably says something unflattering about how I spend my weekends. Here’s what I found.

The Quick Comparison

Before I get into the details, here’s the overview if you’re in a hurry:

Feature	BIRME	Bulk Resize Photos	BulkImagePro
Price	Free	Free	Free
Processing	In browser	In browser	In browser
Files uploaded to server?	No	No	No
Resize by dimensions	Yes	Yes	Yes
Resize by percentage	No	Yes	Yes
Resize by file size	No	Yes	No
Aspect ratio lock	Yes	Yes	Yes
Custom cropping	Yes	No	Yes
Format conversion	No	JPG, PNG, WebP	JPG, PNG, WebP, GIF, BMP
Quality control	Basic slider	Limited	Detailed slider
Batch limit	Unlimited	Unlimited	Unlimited
Additional tools	None	None	Crop, split, compress, convert, flip
UI modernness	Dated	Clean	Modern

All three are legitimate, functional tools. None of them are going to steal your photos or spam you with ads. The differences are in the details, and which one you pick depends on what you actually need to do.

BIRME: The Original That Still Works

BIRME — Bulk Image Resizing Made Easy — has been around for ages, and you can tell. The interface looks like it was designed in 2014, because it probably was. But here’s the thing: it works. Reliably, quickly, without fuss.

You drop your images in, set your target width and height, adjust the JPEG quality if you want, and hit save. That’s it. There’s no account creation, no usage limits, no weird restrictions that kick in after your tenth image. You can process 500 photos and BIRME won’t even blink.

What I genuinely like about BIRME is its cropping feature. When you set dimensions that don’t match the original aspect ratio, BIRME gives you a visual cropping preview for each image. You can drag the crop area around to choose what part of the image gets kept. For product photography where the subject isn’t always centered, this is actually really useful. You’re not blindly hoping the automatic crop grabbed the right part.

The padding and border option is a nice touch too. Need to add white space around your images to hit exact dimensions without distorting anything? BIRME handles it. I’ve seen e-commerce sellers use this to get their product shots onto white square backgrounds without touching Photoshop.

But BIRME’s limitations become obvious pretty quickly. There’s no format conversion — you get out what you put in. If you need to convert a batch of PNGs to JPGs while resizing, you’re out of luck. The resize options are basic: you set pixel dimensions and that’s about it. No percentage-based resizing, no way to resize by longest side. And while the UI is functional, navigating it isn’t exactly a joy when you’re processing large batches.

For simple, straightforward resizing where you know your exact target dimensions? BIRME is solid. It does one thing and it does it fine. But the moment your workflow gets even slightly more complex, you’ll feel the walls closing in.

Bulk Resize Photos: The Clean Middle Ground

Bulk Resize Photos at bulkresizephotos.com takes a more modern approach, and it shows. The interface is clean, intuitive, and doesn’t feel like it’s going to give you a headache after twenty minutes of use.

Where it really shines is in resize flexibility. You’ve got multiple modes: scale by percentage, set the longest side, fit to exact dimensions, set a target file size, or specify width and height independently. That file size option in particular is something neither BIRME nor most other tools offer. If you need every image under 500KB for a CMS that enforces upload limits, you can just tell Bulk Resize Photos “make these all under 500KB” and it figures out the compression.

It also handles format conversion on output. Drop in PNGs, get back JPGs. Drop in anything, get back WebP. That’s a workflow step that BIRME simply can’t do, and it saves you from needing a separate conversion tool.

The limitations? No cropping. At all. If your images need to be cropped to a specific aspect ratio before resizing, Bulk Resize Photos won’t help you. You’d need to crop them first in another tool, then come back to resize. For something like preparing social media images where specific aspect ratios matter, this is a real gap.

The quality controls are also more limited than I’d like. You can adjust output quality, but you don’t get the same level of fine-grained control over compression settings that some workflows demand. For most people this won’t matter. For anyone doing high-volume product photography work where image quality is directly tied to sales, it might.

Overall, Bulk Resize Photos is a genuinely good tool. If your needs are “resize a bunch of images quickly with a clean interface,” it’ll serve you well. The format conversion is a real advantage over BIRME, and the multiple resize modes cover most use cases.

BulkImagePro: When Resizing Isn’t the Only Thing You Need

Full disclosure: this is our tool, so take my assessment with appropriate salt. But I’ll try to be as honest as I’ve been about the other two.

BulkImagePro’s batch resizer handles the same core resize job — set dimensions, drop images, get results. Like the other two, everything processes in your browser. Nothing gets uploaded anywhere. No limits on how many images you can process.

Where BulkImagePro genuinely differentiates itself isn’t in being a better resizer specifically. It’s in being a complete image processing toolkit. Resize is one tool in a suite that includes bulk cropping, splitting, compression, format conversion, and flipping. You can resize your images, then immediately crop them to a specific aspect ratio, then compress them for web — all without leaving the site or downloading and re-uploading between steps.

This matters more than it sounds like it should. Here’s a real example: you’re an eBay seller preparing product photos. You need to resize to 1600x1600, but your originals are 4:3 ratio. So you actually need to crop to square first, then resize. With BIRME you can do both in one step (it has that crop preview). With Bulk Resize Photos, you’d need another tool for the crop. With BulkImagePro, you can crop the entire batch to square, then resize the results, then compress for upload — one site, three operations, done.

The format conversion support is broader too. Beyond the standard JPG, PNG, and WebP outputs that Bulk Resize Photos offers, BulkImagePro handles GIF and BMP conversions as well. Niche? Sure. But if you’ve ever inherited a folder of BMP files from a legacy system that needs to become web-ready JPGs, you know the pain.

The honest downside? If all you need is a quick resize and nothing else, BulkImagePro’s additional capabilities are irrelevant. You wouldn’t pick a Swiss Army knife over a dedicated blade if all you’re doing is slicing bread. For pure “resize these images right now,” any of the three tools will get you there in roughly the same time.

Fifty Product Photos: A Real Workflow Comparison

Abstract feature lists only tell you so much. Let me walk through an actual task I run into regularly: taking 50 product photos from a camera, getting them web-ready at 1200x1200 as compressed JPGs.

With BIRME: Drop the images in. Set width to 1200, height to 1200. Drag each crop preview to center the product (this takes a while with 50 images, but the results are accurate). Set JPEG quality to 85. Download the ZIP. Total hands-on time: maybe 8-10 minutes, mostly spent adjusting crops. End result: resized and cropped JPGs. No format conversion if you needed it. No compression optimization beyond the quality slider.

With Bulk Resize Photos: Drop the images in. Set exact dimensions to 1200x1200. Choose JPG output at target quality. Download. Total hands-on time: maybe 2-3 minutes. But wait — those images were 4:3, and we asked for square. The tool stretched or letterboxed them rather than cropping. If we need actual square crops centered on the product, we’re stuck. We’d need to crop first in a different tool, then come back. Real total time: could be 15+ minutes depending on how you solve the cropping step.

With BulkImagePro: Drop the images into the bulk crop tool first. Set aspect ratio to 1:1. Process. Take those cropped results, drop them into the resizer. Set to 1200x1200. Process. If the originals were PNGs or something else, convert to JPG in the same step. Total hands-on time: about 4-5 minutes for both steps. Clean square crops at the right dimensions.

None of these workflows is objectively “wrong.” They’re different tradeoffs between control, speed, and capability. For this particular task, BIRME gives you the most control over individual crop positions, BulkImagePro gives you the fastest batch workflow, and Bulk Resize Photos would need help from another tool.

The Format Conversion Question

This is where the three tools diverge sharply, and it matters more than a lot of people realize.

If you’re optimizing images for the web, you probably want WebP output. WebP gives you noticeably smaller file sizes than JPEG at equivalent visual quality, and browser support is universal at this point. If you’re resizing images specifically for web use — and let’s be honest, that’s most of why people batch resize — format conversion is part of the job.

BIRME can’t do it. Full stop. If you drop in JPEGs, you get JPEGs back. If you need WebP, you’ll need a separate conversion step, whether that’s a dedicated converter or a tool like BulkImagePro’s format converter.

Bulk Resize Photos handles it cleanly. You can set your output format to JPG, PNG, or WebP regardless of what you put in. It’s straightforward and it works.

BulkImagePro matches that and adds a few more options. The broader format support including GIF and BMP is mostly relevant for edge cases, but the dedicated conversion tools give you more control over the conversion settings when that matters.

If your image dimensions reference sheet says you need WebP files at specific sizes for your website templates, you’ll want either Bulk Resize Photos or BulkImagePro. BIRME is out of the running for that workflow.

What About Privacy?

Here’s the genuinely good news: all three of these tools process your images entirely in your browser. Nothing gets uploaded to a server. Your photos never leave your computer.

This is a bigger deal than it might seem. A lot of image processing tools — especially “free” ones — upload your images to a remote server for processing. Your personal photos, your client’s product shots, your company’s confidential materials — all sitting on someone else’s infrastructure. With BIRME, Bulk Resize Photos, and BulkImagePro, that’s not a concern. The JavaScript running in your browser does all the work locally.

I mention this because it’s worth acknowledging when competitors do something right. All three tools made the correct engineering decision here, and your data is safe with any of them.

So Which One Should You Actually Use?

After spending way too much time with all three, here’s my honest recommendation:

Pick BIRME if you want dead-simple resizing with per-image crop control, you don’t need format conversion, and you don’t mind a dated interface. It’s reliable, it’s free, and the individual crop preview is something the other tools don’t replicate. If you’re a photographer who needs to carefully frame each crop differently, BIRME’s approach is worth the extra time.

Pick Bulk Resize Photos if you want a clean, modern tool that handles basic resizing with format conversion. The multiple resize modes (especially the file size target) are genuinely useful, and the UI is pleasant enough that you won’t dread using it. Just know you’ll need another tool if cropping is part of your workflow.

Pick BulkImagePro if resizing is just one step in a larger image processing workflow. If you regularly need to crop AND resize, or resize AND compress, or convert AND resize, having everything in one place saves real time. The individual resize tool is comparable to the other two, but the suite around it is the differentiator. Also worth considering if you use the aspect ratio calculator to figure out your target dimensions before resizing — it’s all integrated.

And honestly? Bookmark all three. They’re free. Different jobs call for different tools, and having options costs you nothing. I’ve used all three in the same week for different tasks and felt zero guilt about it.

For deeper dives into specific workflows, our bulk image resizing guide covers everything from choosing the right dimensions to preserving quality at scale. And if compression is your next step after resizing, the best image compressors comparison might save you another round of research.

FAQ

Is BIRME safe to use? Yes. BIRME processes all images directly in your browser — nothing gets uploaded to any server. Your photos stay on your computer the entire time. It’s been around for years and has a solid reputation in the image editing community.

Can Bulk Resize Photos convert PNG to WebP? Yes. Bulk Resize Photos supports output in JPG, PNG, and WebP formats regardless of your input format. You set the output format before processing, and every image in your batch gets converted. It’s one of its advantages over BIRME, which doesn’t offer format conversion.

What’s the maximum number of images I can process at once? All three tools are technically unlimited, but your browser’s memory is the practical constraint. On a laptop with 8GB of RAM, I’ve comfortably processed batches of 200-300 images in any of these tools. Go much higher and you might see your browser slow down or crash, depending on the file sizes. For very large batches (500+), consider breaking them into smaller groups.

Do any of these tools work offline? Not natively — they’re all web-based tools that need an internet connection to load. However, once the page is loaded, the actual image processing happens locally in your browser. So if your connection drops mid-batch, the processing should continue fine. You just can’t load the tool without a connection in the first place.

Which tool is best for resizing images for social media? It depends on the platform requirements. Social media platforms each have specific image dimensions they prefer. If you just need to hit exact pixel dimensions, any of the three tools works. If you need to crop to platform-specific aspect ratios first (like 1:1 for Instagram or 16:9 for YouTube thumbnails), you’ll want either BIRME (for its crop preview) or BulkImagePro (for its dedicated crop tool). Bulk Resize Photos doesn’t offer cropping.

Is there a desktop alternative that’s better than all of these? Tools like IrfanView (Windows) and Preview (Mac) can batch resize, and heavyweight options like Photoshop and Lightroom handle it through their export features. But they require installation, and for most people doing occasional batch resizing, a browser tool that’s ready in seconds beats opening a full desktop application. If you’re processing thousands of images daily as part of a production pipeline, desktop tools or command-line solutions like ImageMagick might make more sense. For the 90% of people who need to resize a batch of photos once a week? These browser tools are faster to start using and perfectly capable. Check out our guide on EzGIF alternatives if you’re also looking at GIF-specific tooling.