How to Resize Multiple Images at Once: The Complete Bulk Resize Guide

Published 1 November 2026 · By Sardar Zain, Founder of Orixiva · 12-minute read

Resizing one photo takes a minute. Resizing 300 product photos, a wedding album or a year of blog images one by one takes a whole day. The good news: you can resize multiple images in one go, with the same size, format and file names, in about the time it takes to make a cup of tea.

This guide shows four ways to do it (Windows, Mac, phone and browser), explains the resize modes in plain English, and walks through a full batch in the free Orixiva bulk image resizer, which also compresses, converts and renames your files without uploading them anywhere.

Before you batch resize images: 3 quick decisions

Most failed batches come from starting without a plan. Answer these three questions first and the rest is easy.

Bulk resize modes explained (fit, fill, width, scale)

Every bulk image resizer offers some version of these modes. Picking the wrong one is why photos come out stretched or cut off.

How to resize multiple images at once in your browser (step by step)

This method works on Windows, Mac, Linux and Chromebook, with no software to install. It uses the four stages of the free Orixiva bulk tool: Import, Recipe, Process and Export.

1. Import your images or a whole folder. Open the bulk image resizer and drop files or a folder onto the page, or use Add a folder. Sub-folders are included. JPG, PNG, WebP, AVIF, GIF and BMP are supported.
2. Run the audit (optional, recommended). Open 🔍 Audit & duplicates and press Run audit. It lists sizes, dimensions, formats, transparency and hidden GPS data, and finds exact duplicates so you do not process the same photo twice.
3. Choose a recipe. Pick a ready recipe (Website images, WooCommerce products, Social upload, Email attachments or Private sharing) or choose Custom.
4. Set the resize. Under Resize, choose a mode such as Fit inside box or Set width and type the size.
5. Set format and file size. Under Compress & convert, choose the output format, then either a quality level or a Max size per image (KB). With a KB limit, each file is squeezed until it fits.
6. Set the names. Under Rename & organise, type a pattern like {name}-{w} and choose seo-friendly-slug. The preview shows the result.
7. Process and export. Press ▶ Process all, then ⬇ Download ZIP. Press 📊 Report (CSV) for a list of every file’s old and new size.

What the ready recipes do

• 🌐 Website images: WebP, up to 1,920 px wide, metadata removed, SEO-friendly names.
• 🛒 WooCommerce products: JPG on a white background, fitted to 1,200 × 1,200, under 200KB each, clean names.
• 📱 Social upload: 1,080 px wide, high-quality JPG, metadata removed.
• ✉️ Email attachments: each photo under 300KB and no larger than 1,600 px.
• 🔒 Private sharing: same size and format, all metadata and GPS removed, neutral names like photo-001.jpg.

Built your own settings? Press Save next to the recipe list and reuse them next time.

Bulk resize cheat sheet: which size for which job?

Not sure which numbers to type? These starting points work for most batches. Use them in the bulk image resizer, then adjust after a test run.

Platforms change their guidelines from time to time, so check the latest numbers for anything important, such as marketplace listings.

Example: preparing 120 product photos for an online shop

A small shop owner has 120 photos from a phone: 4,032 × 3,024 pixels, about 3 MB each, with names like IMG_5012.JPG, some portrait, some landscape, and a few taken twice. The goal is square-friendly product images under 200KB with clean names. Here is how the batch resize images job runs:

1. Import: drop the folder (with sub-folders “mugs”, “plates” and “bowls”) into the bulk image resizer.
2. Audit: the audit finds 6 exact duplicates and 14 photos with GPS location. Remove the duplicates from the queue.
3. Recipe: choose 🛒 WooCommerce products: JPG on white, fit inside 1,200 × 1,200, under 200KB each, metadata removed.
4. Names: pattern {folder}-{n:3} with seo-friendly-slug gives mugs-001.jpg, plates-001.jpg and so on, and “Keep folder structure” keeps the three folders.
5. Process and export: 114 photos go from about 340MB to roughly 20MB in total, all under 200KB, ready to upload. The CSV report lists every old and new size.

The exact numbers depend on the photos, but the pattern holds: one recipe, one click, and no file opened by hand.

Bulk image resizer vs desktop apps

How to resize multiple images on Windows

Windows has no batch resize built into File Explorer, but Microsoft’s free PowerToys Image Resizer adds one:

1. Install PowerToys from the Microsoft Store and turn on Image Resizer.
2. In File Explorer, select your photos, right-click and choose Resize with Image Resizer.
3. Pick Small, Medium, Large or a custom size, and press Resize.

It is fast for simple jobs. It cannot compress to a KB limit, convert to WebP or AVIF, rename with patterns or find duplicates, so for web and upload work the browser method saves a second step.

How to resize multiple images on Mac

Preview, built into every Mac, can batch resize:

1. Select the photos in Finder and open them together in Preview.
2. In the sidebar, press Command-A to select all thumbnails.
3. Choose Tools → Adjust Size, enter the width or height, keep “Scale proportionally” ticked, and press OK.
4. Save with Command-S (this replaces the files, so work on copies).

Recent macOS versions also offer Quick Actions → Convert Image when you right-click files in Finder, with Small, Medium and Large sizes. Like PowerToys, neither option sets a maximum KB size or renames by pattern.

How to bulk resize photos on iPhone and Android

Phones have no built-in batch resize. You can install an app, or open the Orixiva bulk resize tool in Safari or Chrome and choose photos from your gallery. It works the same way as on a computer.

Phones have less memory than laptops, so run large jobs in parts of about 300–500 photos. In Metadata & advanced, set Parallel jobs to “1 (low memory)” if the browser struggles.

How long does it take to resize multiple images?

Because the work happens on your own device, speed depends on your computer or phone, not on an internet connection. As a rough idea, a recent laptop processes typical phone photos in a fraction of a second each, so a batch of 200 usually finishes in a minute or two. Converting to AVIF is slower than JPG or WebP, and very large images (over about 40 megapixels) need more memory.

Three ways to make a large bulk resize faster:

• Leave Parallel jobs on Auto on a computer, so several images are processed at the same time.
• Close heavy browser tabs before you press Process all.
• Split very big folders into parts of a few hundred images, especially on phones and tablets.

On Linux and Chromebook, which have fewer built-in options, the browser method is often the simplest way to batch resize images at all.

How to rename images in bulk while you resize

Good file names help people and search engines understand your images. The bulk tool builds names from tokens, so one pattern renames a whole batch.

Bulk resize images for a website (and get srcset code)

Large images are one of the most common reasons pages load slowly. For a website, resize multiple images to the largest size they are shown at (often 1,200–1,920 px), convert them to WebP or AVIF, and remove metadata. Our on-page SEO checklist explains why image weight matters for Core Web Vitals.

Want sharp images on phones and big screens? Turn on Responsive image sets in the recipe. The tool then makes several widths of every image (by default 320, 640, 1,024 and 1,600 px) and writes ready <picture> and srcset HTML for each one. The snippets are copied from the 🧩 Responsive code tab and also saved in the ZIP as srcset-snippets.html. A JPG fallback set can be added for very old browsers.

Bulk resize mistakes to avoid

Overwriting your originals

Preview on Mac and some apps save over the original. Always keep the full-size files; you cannot get detail back once it is gone.

Stretching photos to one exact size

“Exact size” distorts faces and products. Use “Crop to fill” for equal tiles, or “Fit inside box” to keep the whole picture.

Ignoring the file size

A 1,920 px JPG can still be 1 MB. Set a quality level or a KB limit at the same time. For one-off jobs with strict limits, the free image compressor targets exact sizes like 20KB or 100KB.

Sharing location by accident

Phone photos often contain GPS coordinates. Keep metadata set to “Remove all”, or use the EXIF remover to check first.

Processing duplicates

Folders copied from phones often contain the same photo twice. The audit finds exact duplicates by fingerprint (SHA-256) and similar-looking images, so you can remove them before you start.