A JPG resizer for exact pixels, percentages and KB
JPG (also written JPEG) is the format almost every camera and phone uses, and the one upload forms, email and websites expect. This JPG resizer changes the width and height of JPEG photos — by exact pixels with the aspect ratio locked, by percentage, or to a ready-made screen or print size — and can squeeze the result under a file size in KB at the same time.
Drop in one photo or a whole folder’s worth. Each one keeps its own proportions, the before-and-after dimensions and file sizes are listed, and you can download a single JPG or everything as a ZIP. The resizing happens in your browser, so holiday photos, ID scans and client images are never uploaded.
How to use the JPG Resizer
- Drop JPG files on the upload area, click it to browse, or paste an image with Ctrl+V.
- Choose Pixels and type a width (the height follows while “Lock aspect ratio” is ticked), Percentage to scale everything by the same amount, or Preset size for screen and print sizes.
- Set the JPG quality — 85–92% is visually lossless for most photos — and optionally type a target file size in KB.
- For prints, pick a DPI tag such as 300 so the photo opens at the right physical size in print software.
- Check the new size under the preview and press “Download JPG”, or “Download all as ZIP” for a batch.
JPG Resizer features
Pixels, percent or presets
Lock the aspect ratio and type one side, scale by any percentage, or choose Full HD, HD, square, email-friendly and 300 DPI print sizes.
File size in KB
Type a limit and the tool finds the highest JPEG quality that fits, then trims pixels only if quality alone is not enough.
Real DPI tagging
Writes 72–600 DPI into the JPEG’s JFIF header, which print dialogs and design apps read for the physical size.
Crop, fit or stretch
When a preset has a different shape, drag the crop, fit the whole photo on a background colour, or stretch.
Batch with ZIP download
Resize dozens of JPGs with one setting and download them in a single ZIP file.
Clean, private output
Nothing is uploaded, and the saved JPG leaves out the original EXIF data, including GPS location.
How JPG quality, pixels and KB relate
A JPG’s file size depends on two things: how many pixels it has and how strongly it is compressed. Halving the width and height leaves a quarter of the pixels, which usually cuts the file to roughly a quarter. Lowering quality from 92% to 75% often halves it again with little visible change on a phone screen.
So when a form says “under 200 KB”, resize to sensible dimensions first, then let the KB target fine-tune the quality. This tool counts the limit strictly — the file fits whether the site measures 1 KB as 1,000 or 1,024 bytes — and shows the exact byte count so you can be sure before you upload.
Pixel sizes for printing JPG photos
Print size = pixels ÷ DPI. Photo labs print at about 300 DPI; 150–200 DPI is fine for posters viewed from a distance.
| Print size | Pixels at 300 DPI | Pixels at 150 DPI |
|---|---|---|
| 6 × 4 in (15 × 10 cm) | 1800 × 1200 | 900 × 600 |
| 7 × 5 in (18 × 13 cm) | 2100 × 1500 | 1050 × 750 |
| 10 × 8 in (25 × 20 cm) | 3000 × 2400 | 1500 × 1200 |
| A4 (210 × 297 mm) | 2480 × 3508 | 1240 × 1754 |
| 2 × 2 in (51 × 51 mm) | 600 × 600 | 300 × 300 |
Avoiding quality loss when resizing JPEGs
- Always resize from the original photo. Every JPG save adds a little compression, so resizing a resized copy compounds the loss.
- Downscaling looks sharp; upscaling cannot add detail. If a site wants a bigger image than you have, upscale as little as possible.
- JPG has no transparency. Transparent areas of a PNG become the background colour you choose (white by default) — use the PNG resizer to keep them.
- If you only need a lighter file rather than new dimensions, the image compressor is quicker; for a smaller, modern format try the WebP resizer.
JPG Resizer FAQ
How do I resize a JPG without losing quality?
Keep the aspect ratio locked, resize from the original file, and save at 85–92% quality. Making a photo smaller always removes pixels, but at normal viewing sizes the result looks just as sharp.
How can I resize a JPG to 100 KB or less?
Set the pixel size first (for example 1200 px wide), then type 100 in “Target file size”. The JPG resizer lowers quality until the file fits and only reduces the dimensions if it has to.
What is the difference between JPG and JPEG?
None — they are the same format. Older Windows versions limited extensions to three letters, so “.jpg” became common alongside “.jpeg”.
Can I change a JPG to 300 DPI?
Yes. Choose 300 in “DPI tag”. The pixels stay the same; the header now tells printers to print 300 pixels per inch. For a 6 × 4 in print at 300 DPI you also need 1800 × 1200 pixels.
Can I resize many JPG files at once?
Yes. Drop several files together; they share the settings, keep their own proportions and download as one ZIP.
Are my photos uploaded?
No. Resizing runs in your browser using the canvas API, so your photos stay on your device.