One image resizer, three kinds of target
Most tools make you pick between a compressor, a pixel resizer, and a print tool. This free online image resizer does all three, because real tasks usually mix them — an exam form wants a photo under 50KB and at a certain pixel size; a passport office wants 3.5 × 4.5 cm and under a KB cap. Set the target that matters, add an optional file-size limit, and the tool works backward to hit it.
Resize an image in KB
Pick a preset — 20KB, 50KB, 100KB, 200KB, 500KB, 1MB — or type any custom number. The resizer tests a range of quality levels and narrows in on the highest one that still fits under your limit, shrinking dimensions only if quality reduction alone can't get there. Need it in MB? 1 MB = 1024 KB, so type 2048 for 2MB.
Read the full walkthrough: how to resize an image to 20KB, 50KB, or 100KB for application forms.
Resize an image in pixels
Switch to Pixels mode and type a width — with aspect ratio locked, the height follows automatically so nothing gets stretched. Uncheck the lock to force an exact width × height; the photo is centre-cropped to fill the shape rather than distorted. You can also add an optional max KB, so the output meets a pixel requirement and a file-size requirement at the same time.
Resize an image in cm — print & passport photos
Screens think in pixels, but forms and printers think in centimetres. Print size mode takes a width and height in cm plus a DPI setting and converts them into exact pixels (at 300 DPI, the print and passport standard, 3.5 × 4.5 cm becomes 413 × 531 px). The photo is centre-cropped to the exact shape, and you can cap the file size in KB at the same time — which is precisely what passport and visa portals ask for. More detail: resizing images in cm for passport photos.
Bulk image resizer
Drop as many photos as you like — each one is processed against the same settings, one at a time, right on your device. Download results individually or grab everything at once as a ZIP. Because nothing is uploaded, a batch of fifty photos doesn't queue behind anyone else's — your own hardware is the only limit. See the bulk resizing guide for tips on large batches.
Simple, free, and fully online — without the upload
This is an online image resizer in the sense that it lives at a URL — but unlike most, it never sends your image anywhere. The entire engine ships to your browser as JavaScript and runs locally, which makes it faster for large files, safe for ID photos and documents, and free to offer without limits: no sign-up, no watermark, no daily cap.
The exact sizes people look for
Searches for an image resizer to a specific size cluster around a handful of numbers. An image resizer to 20KB or 50KB covers most exam and passport forms. 100KB or 200KB fits looser upload limits. Less common but still frequent: 500KB, 1MB, 30KB, 10KB, 15KB, and 40KB. Type any of these into the custom box above — the tool works the same way regardless of the number.
Use scores of quality wisely
Very tight targets — a large photo squeezed into 10–20KB — always cost some sharpness. The tool keeps as much resolution as it can by preferring quality reduction over dimension reduction, but if a result looks too soft for your purpose, try a slightly larger KB target or a smaller pixel size first.
Frequently asked questions
How do I resize an image to 20KB or 50KB?
Choose Target KB mode, tap the 20KB or 50KB preset (or type a custom number), then drop your photo. The resizer automatically finds the highest quality that fits under your limit.
How do I resize an image in pixels?
Switch to Pixels mode, enter the width (and height if you unlock the aspect ratio), and drop your image. Add an optional max KB if you need both constraints met.
How do I resize an image in cm?
Use Print size mode: enter width and height in centimetres and pick a DPI — 300 is standard for print and passport photos. The tool converts cm to exact pixels and centre-crops your photo to fit.
Can I bulk resize images?
Yes — drop any number of images, and download them individually or together as a ZIP.
Is my photo uploaded to a server?
No. All resizing happens locally in your browser. You could disconnect from the internet after the page loads and it would still work.
How is this different from Canva's image resizer?
Canva's resizer lives inside its editor, needs an account, and exact-size export sits behind paid plans. This tool is free, account-free, works on exact KB / pixel / cm targets, and never uploads your image.
Can I resize an image in MB?
Yes — 1 MB is 1024 KB. Use the 1MB preset, or type the MB value × 1024 into the custom box (2MB = 2048).