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What this does
Photos straight off a phone or camera are huge: several thousand pixels wide and many megabytes each. Websites, email, and chat apps do not need that, and they choke on it.
Think of it like a hose nozzle. You pick the biggest a picture is allowed to be, and every picture that is too big gets squeezed down to fit. Pictures that already fit are left alone.
Two ways to set the limit
- Max dimensions: pick a box, like 1024 x 1024. Each picture is scaled to fit inside it. Shape is kept, and nothing is ever enlarged.
- Max file size: type a number of kilobytes. Each picture is re-saved until it comes in at or under that size. Quality is lowered first; if that is not enough the picture is also shrunk.
How to use it
- Pick a folder (Chrome or Edge on a computer), pick files, or drop images onto the page. Tick Include subfolders to go deeper.
- Choose a mode and a limit. Optionally tick Show actual size to see the box at true screen size.
- Press Dry run. Every picture is actually processed in memory, so the After size column is exact, not a guess. Nothing is written yet.
- Click any row to compare the original and the result side by side. Tick Actual pixels to see them at true size.
- Press Resize all. The files from the dry run are written out, so this step is fast.
Where the results go
If you picked a folder in Chrome or Edge, each original moves into an Original subfolder and the smaller copy is saved next to where it was, with _RS added to the name. Nothing is deleted.
On a phone, in Firefox or Safari, or if you used Pick files, the browser cannot write into your folders, so the results download as one zip file instead.
Your privacy
Your photos never leave your device. Resizing happens inside the browser; nothing is uploaded and nothing is stored on a server.
Common questions
Which formats work?
JPEG, PNG, WebP, BMP, GIF, and AVIF. TIFF is not supported because browsers cannot read it.
Will it rotate my sideways phone photos?
Photos that carry a rotation tag are saved upright.
Does it keep the photo details, like location?
No. Resized copies are written without EXIF or GPS data, so where and when a photo was taken does not travel with it. Your originals are untouched and keep everything.
What does Include subfolders do?
Pictures inside folders within your folder are processed too. Each folder gets its own Original subfolder. Folders already named Original are skipped so nothing is processed twice.
What does the Quality slider do?
It sets how hard JPEG and WebP are compressed. Lower means smaller files with more visible softening. PNG ignores it because PNG never loses quality.
Can I use this offline?
Yes. Once the page has loaded, it keeps working without a connection.
Is there a Windows version?
Yes. The desktop ImageSizeReducer at the-Automator.com does the same job on your PC with no browser involved, and can show you the chosen size as a frame on screen.