Priya finished a redesign last Thursday. By Friday morning she had forty-three hero images in four different aspect ratios, and every single one was the wrong size for the CMS. The CMS wanted 1200×630. She had 2560×1440, 1920×1080, and one inexplicable 800×1200 from a contractor who had already left the project.
She opened her image folder and stared at the grid. Resizing one image in Preview is fine. Resizing forty-three, one by one, while checking that the proportions do not distort, is the kind of task that makes you reconsider your career.
The pain, in four layers
Pain 1: every platform wants a different size.
Social cards want 1200×630. Instagram wants 1080×1080. A blog hero wants 1600×900. You do not have one image. You have one image that needs to become six images, and you are expected to remember which size goes where.
Pain 2: the obvious tools handle one file at a time.
Open, resize, export, close, repeat. For three images this is fine. For forty-three it is a tax on your afternoon. And if you miss one, you find out when the marketing team pastes a stretched thumbnail into a campaign.
Pain 3: most resizers want your file on their server.
You are resizing client mockups, unreleased product shots, and internal screenshots. Uploading them to a free online tool is a small act of trust you should not have to make. The file leaves your machine, gets processed on a server you do not control, and then you download it back. That is not resizing. That is lending your files to a stranger.
Pain 4: keeping proportions is harder than it looks.
Type 1200 into the width field and the height becomes 675 — if you remember to check the lock icon. Forget once and you get a person who looks like they have been compressed by a hydraulic press. The damage is invisible until someone else sees it.
The tool
OnliTools Image Resizer handles this in the browser. You select your images, set the dimensions or a maximum edge, and download a ZIP of everything at once. The processing stays on your device. Nothing uploads. Nothing leaves.
How it works
- Go to onlitools.com/image-resizer.
- Drag in your images — as many as you need.
- Set exact dimensions, a percentage, or a maximum edge length.
- Keep proportions locked by default (unlock only if you mean it).
- Download the batch as a ZIP.
Why this matters
Priya resized all forty-three images in under two minutes. The proportions held. The ZIP contained every size she needed, named cleanly, ready to drop into the CMS. No upload. No install. No afternoon lost to repetitive clicks.
If you are resizing more than three images, you are already paying the cost of a bad tool. This one is free, local, and fast enough to make the old way feel like a mistake.
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