Image Resizer
Local-first
Resize images by width, height, or percentage.
What is Image Resizer?
Resize images by width, height, or percentage.
- Resize by width and height
- Lock aspect ratio
- Preview resized output
How to use it
- Choose or drop the JPG, PNG, WebP files you want to process.
- Adjust quality, size, or output options when available.
- Run the tool to resize images and preview the result on the page.
- Copy the output or download the generated file when it looks right.
Best use cases
- Prepare website images, screenshots, product images, or phone photos.
- Convert files before uploading to a CMS, blog, job page, or social platform.
- Use it when privacy matters and the input should stay inside the browser.
Official standards and scope
The HTML Standard defines how drawImage() paints a source image into a destination rectangle and how a canvas bitmap is serialized. This page accepts any browser-decodable image, previews the first selected file, and initially applies that first image's natural width, height, and aspect ratio to the shared controls. Every selected image is then stretched into the same requested rectangle and exported as PNG; the keep-ratio checkbox only couples the two inputs using the first image's ratio. There is no crop, per-file sizing, upscaling warning, resampling-kernel choice, focal-point control, DPI setting, or output-format selector. Animation, source metadata, profiles, high bit depth, and exact color-management semantics are not deliberately preserved. Verify each output, especially when a batch contains different aspect ratios or when dimensions are much larger or smaller than the source.
- WHATWG HTML Standard: CanvasRenderingContext2D.drawImage() - WHATWG
- WHATWG HTML Standard: Serializing bitmaps to a file - WHATWG
Sources checked July 27, 2026. Standards and platform rules can change; review the original sources again before formal integration or compliance decisions.
Notes
- Browser support for JPG, PNG, WebP can affect preview and export behavior.
- Large or batch files use more browser memory, so process them in smaller groups when needed.
- Preview the result before using it in production, publishing, or submission workflows.
FAQ
Can it keep aspect ratio?
Yes. Aspect ratio is locked by default.
Is Image Resizer free to use?
Yes. You can use it directly in the browser without creating an account.
Does Image Resizer support batch processing?
Image tools with multi-file input can process multiple files. The exact behavior depends on the file picker shown on the page.
Are files or content uploaded?
Image Resizer runs in your browser, so your input or files are not uploaded to DataHub servers.
Can I use Image Resizer on mobile?
Yes, but desktop browsers are better for large files, batch conversion, or long text input.
Why can conversion or validation fail?
Common causes include corrupted files, unsupported browser codecs, very large files, or low memory.
Can I use the result commercially?
The tool only processes your own input. Commercial use depends on the rights of the original file or data.