Lumo guides
Simple guides for better website images.
Choose a size, make files smaller, or prepare a whole folder. Find the steps for the job you have.
New to Lumo? Start here
Using Lumo
Folders, automatic processing, output sets, and app settings.
Prepare a folder of images for your website
Open a local folder, save prepared copies, and pick up new or changed images without starting over.
Process new images automatically
Turn on Auto for a batch or folder, choose when copies are saved, and know what to check when work pauses.
Create and reuse output sets
Choose a built-in size set or make your own, with help for every field, sizing rule, and filename.
Image preparation settings explained
Find what every preparation control does, from width limits and quality to output sets, export folders, and reset.
Prepare images with an AI agent and Lumo
Share a source folder and its Lumo settings with your agent, then use the prepared files in your project.
Language, updates, and workspace settings
Change Lumo's language, check for updates, reopen unfinished work, or clear a workspace when you're done.
Everyday tasks
Resize, convert, and save the images you already have.
Formats and quality
Choose a format and check what changes.
WebP, AVIF, JPEG, or PNG: which should you use?
Choose an output format based on your website, image detail, and whether you need a transparent background.
Make image files smaller while keeping them looking good
Reduce dimensions, compare formats, and adjust quality while checking the detail your image needs.
Convert HEIC photos to JPEG or WebP
Prepare supported HEIC photos locally, choose JPEG or WebP output, and save copies for your website.
Keep transparent backgrounds when preparing images
Choose WebP, AVIF, or PNG to keep transparency, and understand why JPEG conversion can fail.
Website workflows
Prepare images for the place you’ll use them.
What size should your website images be?
Choose image dimensions from the space on your page, with practical examples for cards, articles, and large images.
Create multiple image sizes from one original
Generate several widths in one batch, then give your website the information it needs to choose a suitable file.
Prepare product images for an online store
Match your store's image dimensions, keep product detail, and check crops before uploading prepared copies.
Prepare hero images that look sharp and load quickly
Size the large image at the top of your page, check mobile crops, and avoid delaying its download.
An image SEO checklist before you publish
Check image dimensions, filenames, alt text, and page delivery before publishing your website.