Resize a JPG to an exact file size in KB, to exact pixel dimensions, or both at once. Free, no signup, and the image never leaves your device.
Most resize tools only shrink. This one works in both directions: push a file up to meet a minimum size an application form demands, or pull it down under a ceiling. Pick your target in kilobytes, hit the button, download the result.
Two different things people call “JPG resize”
Almost every rejected upload comes down to confusing these two. They are unrelated, and fixing the wrong one will not clear the error.
| What the form means | What it looks like | Tool you need |
|---|---|---|
| File size — how many kilobytes the file occupies | “Image must be between 20KB and 50KB” | Increase in KB or Reduce in KB |
| Dimensions — how many pixels wide and tall | “Photo must be 3.5cm × 4.5cm” or “240 × 320 px” | Resize by pixels |
If the error message mentions KB or MB, it is file size. If it mentions pixels, centimetres, inches or aspect ratio, it is dimensions. Some portals check both, which is what the photo and signature tool handles in one pass.
How to resize a JPG
- Tap Choose Image and pick the photo from your gallery, camera roll or desktop.
- Type the size your form asks for, or tap a preset chip — 20KB, 50KB, 100KB, 200KB.
- Hit the button. Processing takes a second or two on your own device.
- Download. The file matches your target exactly.
Four taps, no account, no watermark, no queue.
Every tool on this site
- Increase image size in KB — for forms that reject a photo for being too small.
- Reduce image size in KB — compress under a ceiling without wrecking the picture.
- Resize image in pixels — exact width and height, in px, cm or inches.
- Signature resize — the 10–20KB, 6cm × 2cm job every exam form wants.
- Passport size photo maker — 3.5cm × 4.5cm at the right file size.
- Convert to JPG — PNG, WebP, AVIF and iPhone HEIC in, JPG out.
Why nothing is uploaded
The whole process runs inside your browser using the Canvas API. There is no upload, no server, no storage bucket and no retention policy to read. Load the page, turn off your mobile data, and the tool still works.
That matters more than it sounds. You are usually handling an identity photograph and a signature — the two documents most worth protecting in any application.
Frequently asked questions
How do I resize a JPG to an exact KB size?
Upload the JPG, type your target in kilobytes, and download. The output matches the number you entered exactly — 50KB means 50KB, not 49 or 52. That precision matters because form validators reject anything outside their stated range.
Can I resize a JPG without losing quality?
Going up, yes — quality stays identical or improves slightly. Going down, some loss is unavoidable, but the tool finds the highest JPEG quality that still fits your ceiling rather than crushing the image to a fixed low setting.
Does JPG resize work on a phone?
Yes, and it is built phone-first. It works in Chrome, Safari and the Android system browser, and you can pick photos straight from your gallery or camera. There is no app to install.
Is there a file size limit?
Files up to 20MB work fine. Processing runs on your own device, so a very large image on an older phone may take a few extra seconds, but there is no cap imposed by us and no queue to wait in.
What image formats can I use?
JPG and JPEG are the main ones. PNG, WebP and AVIF also work and are converted to JPG on the way out, which is the format most application portals expect anyway.
Is JPG resize free?
Completely. No signup, no credits, no watermark and no paid tier. The tool is a few files of JavaScript that run on your device, so there is no server cost to pass on.