Image Resizer PCResize an image to an exact KB target
This is the part most online tools can't do well. Type the number your form or exam portal asks for — say 50, 20, or 100 KB — and the app runs a quick binary search over the JPEG quality to land at or under that size. If quality alone can't get there, it gently downscales the pixels too, so you always end up under your cap instead of just "close."
A practical tip: aim for the top of the allowed range, not the bottom. If a portal allows 20–50 KB, target 50 KB — you get a noticeably sharper result than squeezing to 20. Only go small when the rule forces you to.
- Set the KB value, watch the preview update, then save.
- The result is always at or under your target, never over.
- For tiny targets (like a 20 KB signature) some visible softening is normal and unavoidable — that's physics, not a bug.
Resize by pixels, or by cm + DPI
Pixels are best when a portal lists an exact pixel size (for example 200×230 px for an exam photo). Just type the width and height.
Centimetres + DPI is best for print and official photos. A standard passport/visa photo is 3.5×4.5 cm at 300 DPI — type that in and the app computes the pixels for you (about 413×531 px). You don't have to do the maths.
Then decide how to fit it: keep aspect ratio preserves the whole image (it won't stretch faces), while center-crop fills an exact box — ideal when the portal demands a precise frame and your photo isn't the right shape.
Batch a whole folder at once
If you have many images to prepare — a class's worth of exam photos, a folder of product shots — drag the whole folder in. The app applies the same target (KB, pixels, or cm + DPI) to every file and saves them together. There's no limit on how many files you can queue.
This is the everyday advantage of a real desktop app over a one-file-at-a-time website: set it once, run the batch, done.
Formats and staying sharp at small sizes
Most government and exam portals want JPG, so that's the safe default for photos and scanned signatures. Use PNG when you need crisp edges or transparency, WebP for the smallest web files, and BMP only if something specifically asks for it.
To keep things sharp at a small KB cap: start from the best-quality original you have (not a screenshot of a screenshot), target the highest KB the rule allows, and resize to the portal's exact pixel size rather than shrinking a huge image way down. We'll never claim "no quality loss" — at small targets there's always some. The honest promise is the best quality that still fits your size.