Image Resizer
Resize an image to any pixel dimensions you choose. Set width, height, or both.
Clear one field to scale proportionally.
Finding the best quality that fits…
- Original
- —
- Result
- —
- Reduction
- —
- Dimensions
- —
How to use this tool
- Select your file, drag it onto the box above, or paste it from your clipboard.
- Processing starts automatically — there is nothing to configure.
- Check the result panel, which shows the original size, the final size and the output dimensions.
- Click Download to save it.
Leave one field blank to scale proportionally — set only the width and the height follows automatically, keeping the aspect ratio. Fill in both and the image is scaled to fit those exact dimensions, which will distort it if the ratios differ.
The specification
| Width / height | Whatever you enter, in pixels |
|---|---|
| One field blank | Scales proportionally |
| Both fields set | Exact dimensions, may distort |
| Output | JPEG |
| Maximum input | 25 MB |
Why uploads get rejected
Meeting the size is only part of it. These are the failures that actually come up:
- Both dimensions were set with a very different aspect ratio from the source, so the result looks stretched. Leave one blank to keep the proportions.
- The target is larger than the source. Enlarging cannot add detail that was never captured.
- The form also had a file size limit, which dimensions alone do not address.
How it works
Most compressors pick a fixed quality level and hope for the best, which is why they either overshoot the limit or land far below it and throw away detail you did not need to lose.
This tool runs a binary search instead. It encodes your image at a mid-range quality, measures the resulting file, then narrows the range — higher if there is room, lower if it is over — repeating seven times. It keeps the largest result that still fits. If the lowest quality is still too big, it reduces the pixel dimensions and searches again.
All of it runs on your own device using the browser's canvas API. Nothing is transmitted.
Who uses this
Anyone needing specific pixel dimensions — a profile picture, a header, a form field, or a batch of images made consistent.
Frequently asked questions
How do I keep the aspect ratio?
Fill in only one dimension and leave the other blank. The tool calculates the matching value automatically.
Can I enlarge a small image?
You can, but it will look soft. Upscaling stretches existing pixels; it cannot recover detail that was never there.
Will the quality drop?
Some quality is always lost when a file gets smaller — that is what compression means. The tool searches for the highest quality that still fits under your limit, so it gives up as little as possible.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device. Your file is never transmitted and never stored by us. You can confirm this by opening your browser’s Network tab while you use the tool — you will see no upload request.
Is there a limit on how many files I can process?
No. There is no daily cap, no account, and no watermark. Because the work happens on your device rather than our servers, there is nothing for us to ration.
Is this tool really free?
Yes — no account, no trial, no watermark, and no cap on usage. It runs on your own device rather than our servers, so there is no cost for us to pass on.
Does it work on mobile?
Yes. The interface adapts to phone and tablet screens, and everything runs in the browser, so there is no app to install.
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Your files stay on your device. This tool runs entirely in your browser. No file is uploaded, transmitted, or stored. You can verify this by opening your browser's Network tab while using the tool.
Disclaimer. Specifications published by exam boards, governments and platforms change without notice. We verify and date every specification on this site, but you should always confirm against the official source before submitting an application. See our full disclaimer.