Increase image size in KB
Grow a photo or signature to an exact file size, like 20 KB, 50 KB or 100 KB, for upload forms that reject files below a minimum. No quality loss, because the pixels are never recompressed. Or switch modes and enlarge the image itself, 2x to 4x. Everything runs in your browser.
Built for exam, job, visa and bank portals that ask for a photo or signature between fixed KB limits. Get the dimensions right first if the form specifies them.
To the exact size in four steps.
Drop the image, pick file size or dimensions, set the target and download. Nothing leaves your device at any point.
Add your image
Drop a JPG, PNG or WebP onto the tool or pick one from your device. You see its current file size and pixel dimensions straight away, and the image never leaves your browser.
Pick what to increase
Choose File size to hit an exact KB target, the mode built for upload forms with a minimum size. Choose Dimensions to enlarge the picture itself, by 2x, 3x, 4x or to an exact width.
Set the target
Tap a preset like 50 KB, 100 KB or 500 KB, or type your own number. For dimensions, lock the aspect ratio and the height follows the width on its own.
Download the result
The tool writes a new copy at the exact size you asked for and downloads it. Your original file stays untouched on your device.
Bigger file, same picture.
Most tools shrink images. This one goes the other way, for the forms and layouts that need a heavier file or a larger picture than the one you have.
Exact KB, not roughly
Portals that demand a file between 20 KB and 50 KB do not care about roughly. The file size mode pads the file to the exact byte count you set, so a 50 KB target downloads at precisely 50 KB.
Zero quality loss in file size mode
The padding is invisible data added inside the JPG or PNG structure. The pixels are not recompressed or touched, so the photo looks identical to the original, just with a bigger number next to it.
Proper enlargement too
Need a bigger picture, not just a bigger file? The dimensions mode scales the image up in clean steps with high quality smoothing, to 2x, 3x, 4x or the exact width you type.
Private by design
Photos, signatures and ID scans are exactly the files these forms ask for, and exactly the files you do not want on a random server. Everything here runs in your own browser, nothing is uploaded.
Uploads your users never fight.
Every person using this tool is working around a form that rejected a perfectly good photo. If that form is yours, the better fix is an upload flow that accepts any reasonable image and resizes, compresses and validates it automatically. We build web and mobile apps with pipelines like that at Techliphant, so your customers never need a workaround.
Need the opposite? Try the image compressor, or fix the pixels first with the image resizer.
Common questions.
Upload forms are the usual reason. Exam applications, job portals, visa and passport systems and bank forms often reject a photo or signature that is under a minimum, with rules like "between 20 KB and 50 KB". Modern phones and compressors produce very small files, so a perfectly good image gets rejected for being too light. This tool brings it up to the required size without changing how it looks.
Image formats allow extra metadata blocks inside the file. The tool adds a padding block of that kind, sized so the file lands exactly on your target. For a JPG it inserts a standard comment segment, and for a PNG a standard text chunk. Every normal viewer and upload form reads the image exactly as before, because the pixels are untouched.
No. In file size mode the picture data is copied through unchanged, nothing is recompressed, so quality is identical to the original. In dimensions mode the image is genuinely resampled to more pixels, which keeps it smooth and clean, though enlargement can never invent detail that the original photo did not capture.
Yes, that is the main job of the file size mode. Type 50 or 100, or tap the preset, and the downloaded file is exactly that many kilobytes. The tool counts a kilobyte as 1,024 bytes, which is what file systems and most portals use.
Then it needs compressing rather than padding, which is the opposite job. Use our image compressor to bring it under the limit, and if a form wants a size window like 20 KB to 50 KB, compress to just under 50 KB or compress further and pad back up to an exact figure here.
Switch to the dimensions mode and pick 2x, 3x or 4x, or type the exact width you need. The tool scales in repeated clean steps with high quality smoothing, which avoids the jagged edges a single big jump can produce. It is upscaling by resampling, so it will not invent new detail, but the result stays smooth for print layouts, slides and page designs.
JPG, PNG and WebP go in. File size mode writes JPG or PNG, because those are the formats upload portals expect and the ones that take exact padding cleanly. A WebP input is converted first. Dimensions mode can save JPG, PNG or WebP.
No. The file is read, padded or resized, and written back entirely with JavaScript in your browser. Nothing is sent to us or stored, which matters for the ID photos, signatures and documents these forms usually involve.
Check the other rules in the form. Most portals combine a size window with an exact pixel dimension, like 200 by 230 pixels for a photo or 140 by 60 for a signature, and a format requirement, usually JPG. Get the dimensions right with our image resizer, save as JPG, then set the file size here.
The padded file itself stays at its exact size wherever you copy or upload it. But if you open it in an editor and save it again, the editor rewrites the file and the padding is gone. Do the padding as the last step, after any cropping or resizing.
That is the other side of this tool. If your own product forces users to fight KB limits, the fix is software that accepts any reasonable photo and handles resizing and compression itself. We build web and mobile apps with that kind of upload pipeline at Techliphant, so the tool your customers need is one your product never makes them look for.
Private by design: this tool runs entirely in your browser. Your photo, signature or scan is never uploaded, sent anywhere or stored, and the resized copy is written on your own device. It is provided free for everyday use.
Ready when you are
Let's build something exceptional.
Tell us about your business, your stack, and the problem you are trying to solve. We respond with a clear next step usually a 30-minute discovery call, no fluff.