Resize image online
Set exact pixel dimensions with the aspect ratio locked — or free. Everything runs in your browser: no uploads, no sign-up, no watermarks.
Result appears here
Resizing another format? Resize JPG , Resize PNG
How to resize an image
- 1. Drop your image onto the tool or click to choose a file. Its current size is filled into the width and height fields.
- 2. Type the width or height you need. With aspect lock on, the other value follows automatically and the preview updates as you type.
- 3. Hit Download. The resized image is saved straight from your browser.
Supported formats
| Format | Open as input | Save as output | Good to know |
|---|---|---|---|
| JPG / JPEG | Yes | Yes | Universal compatibility. No transparency (flat areas become white). |
| PNG | Yes | Yes — Auto keeps PNG | Lossless when kept as PNG. Transparency kept. |
| WebP | Yes | Yes | Usually the smallest files; transparency kept. |
| AVIF | Yes (recent browsers) | Saved as WebP | Browsers decode AVIF but can't encode it yet — details in the compatibility section below. |
Settings explained
- Width & height (pixels)
- The exact dimensions of the output. Values up to 16384 px per side are accepted.
- Lock aspect ratio
- On: changing one value rescales the other by the image's original proportions, so nothing is stretched. Off: both values are independent — useful when a platform demands exact, non-proportional dimensions.
- Output format
- Auto keeps the original format. Choosing JPEG or WebP re-encodes regardless of input.
- Quality (1–100%)
- Applies to JPEG and WebP output. PNG is lossless, so the slider is ignored for it.
Output behavior
- The output has exactly the dimensions you entered — with lock on, always in the original proportions.
- Even with Auto and unchanged dimensions, the image is re-encoded, so the file size changes and metadata is not carried over.
- EXIF, GPS and camera metadata are stripped from the output.
- Transparency is preserved in PNG and WebP output; JPEG flattens it to white.
- Upscaling is allowed but the tool says so plainly: enlarged output cannot regain detail.
Real resizing results
Measured by saving the same 1600×1000 test image at each width as JPEG quality 90, so the difference comes from the dimensions alone. Your files will differ — the ratios are what matter.
| Dimensions | File size | vs. original |
|---|---|---|
| Original — 1600 × 1000 | 91 KB | — |
| Resized to 1600 × 1000 | 91 KB | 0% larger |
| Resized to 1200 × 750 | 69 KB | 24% smaller |
| Resized to 800 × 500 | 38 KB | 59% smaller |
| Resized to 400 × 250 | 14 KB | 85% smaller |
Privacy
This tool works completely offline in your browser. Your image is read into memory, rescaled and re-encoded locally, and offered back to you as a download. Nothing is transmitted to any server, and closing the tab discards everything.
Browser & device compatibility
- JPG, PNG and WebP work in every modern browser.
- AVIF input needs a recent browser — current Chrome, Edge, Firefox or Safari 16+. On older browsers you'll see a clear message instead of a broken result.
- Very large images can exceed the memory of older phones and tablets — processing happens on your device, so your hardware sets the ceiling.
Troubleshooting
- "That file type isn't supported" — the file isn't a JPG, PNG, WebP or AVIF image. Rename or re-export it first.
- "Your browser couldn't decode this file" — the type is recognized but this browser can't read it (often AVIF on an older browser), or the file is corrupted.
- Enlarged image looks soft — that's upscaling: pixels can't be recreated. Resize from the largest original you have.
- The field refuses a value — dimensions are capped at 16384 px per side, a limit browsers impose on canvas processing.
Related tools
- Compress Image — Reduce JPG, PNG and WebP file size with quality you control.
- Convert Image — Convert between JPG, PNG, WebP and AVIF without uploading a thing.
- Crop Image — Trim to the perfect frame or a preset aspect ratio.
Frequently asked questions
How do I resize an image to exact dimensions?
Drop your image, type the width or height you need — the other value follows automatically while aspect lock is on — then download. The preview shows the exact result before you save it.
Does resizing reduce image quality?
Downscaling (making an image smaller) discards pixels, so some detail is permanently removed — but at typical sizes the result still looks sharp. Upscaling cannot create detail that was never captured, so enlarged images look soft. The tool warns you when an output would be upscaled.
Will the file size get smaller too?
Almost always, because file size scales with pixel count. The measured table below shows the same test image saved at several widths. Re-encoding also strips metadata, which reduces the size further.
Can I resize photos for social media and profile pictures?
Yes — type the dimensions you need (Instagram posts 1080×1080, YouTube thumbnails 1280×720, WhatsApp profile pictures, and so on), keep the aspect ratio locked so nothing stretches, and check the preview before downloading.
What does "Lock aspect ratio" do?
It preserves the proportions of your image. Change the width and the height adjusts automatically — and vice versa — so the picture is never stretched. Turn it off to set width and height independently.
Are my images uploaded to a server?
No. Resizing runs entirely in your browser on your device's own processor. Your images never leave your computer or phone.