File weight · pixels untouched
Increase
image size
in KB or MB.
Reach an exact file size — 50 KB, 100 KB, 240 KB — for any form that rejects a photo below a minimum. Pixel dimensions stay exactly as they are, and nothing is ever uploaded.
No upload · no sign-up · no watermark
01 · The rejection
Why a form rejects a small photo
Most upload errors are about files being too heavy. The other kind catches people off guard: the portal wants a minimum weight. A passport office that prints at 300 DPI cannot measure sharpness at the door, so it sets a floor in kilobytes — “minimum 50 KB” — on the assumption that anything lighter has been squeezed into a thumbnail.
The usual fix makes it worse. Scaling the picture up changes its width and height, and the same form now rejects it for the wrong dimensions. This tool leaves the pixel grid completely alone and only changes how much the file weighs.
02 · The mechanism
How the size is reached
Re-encode at the highest quality those dimensions can hold
The encoder is pushed until the file is as large as your existing pixels allow. These are real image bytes, and they survive a portal that re-encodes whatever it receives.
Top up the remainder with declared metadata
If maximum quality still lands under the target, the gap is filled with a standards-compliant segment — a JPEG comment, a PNG tEXt chunk, a WebP JUNK chunk. Every viewer ignores it; pixel data, dimensions and DPI stay untouched.
Portals that re-encode every upload will strip metadata, and the file falls back to its real-pixel weight. That is why the quality step runs first — bytes carried by pixels survive re-processing; bytes carried by metadata do not.
What stays the same
03 · By size
Increase image size in KB: the targets forms actually ask for
Size floors cluster around a handful of numbers, because the people who write them copy each other. 20 KB and 30 KB come from signature strips and exam photos. 35 KB and 40 KB come from school portals and application desks. 50 KB is the passport and visa number. 100 KB is what almost everyone else settles on.
Each of those has its own page with the target already loaded, so nothing has to be retyped. If your number is not in the list, type it into the tool above — any value from 1 KB upward works, and the button updates as you type.
04 · Megabytes
Increase image size in MB: when a portal wants weight
Megabyte floors are rarer, and they usually mean print. A university that plans to enlarge an applicant's photo, a stock desk that will resample it, a scholarship form expecting an A4 print — these ask for 1 MB or more because a lighter file would not survive the enlargement.
The tool counts 1,024 KB to a megabyte, the same as your file browser, so a result it calls 1 MB is 1 MB in the form field too. Anything above that is entered in KB: 2 MB is 2048. The 1 MB page works through that floor in detail, including why some applicants get bounced for being under it.
05 · Online
Image increase size online — free, no upload, no account
Most tools that call themselves online still send the file to a server. This one does not. The entire encoder runs inside the page, so the image never leaves the device — load the page once, switch the network off, and it keeps working.
That matters most for the documents people actually use this on: passports, ID scans, signatures, medical letters. There is no account to create, no watermark on the output and no daily quota. The price is zero because there is no server to pay for.
06 · Formats
Does it work for JPG, PNG and WebP?
All three, though the path differs by format and the difference is visible in the result. A PNG is not re-encoded when it needs to grow — a tEXt chunk is appended and the pixel data stays byte-identical. JPG and WebP are re-encoded at maximum quality first, then topped up with a comment or JUNK segment.
HEIC files from an iPhone are the one exception: no browser can decode them, so export to JPG first. The JPG page covers that format's own ceiling — chroma subsampling, progressive encoding, and why quality 100 is not the same thing as “more detail”.
07 · Questions
Questions people actually ask
How do I increase an image size to 100 KB?
Drop the photo in, keep 100 KB selected, and press the button. The engine re-encodes the image at the highest quality your pixel dimensions allow, then tops up the remaining bytes with a standards-compliant metadata block — the file lands on 100 KB exactly and the width and height never change.
Does a bigger file mean better quality?
Up to a ceiling. The encoder runs at maximum quality for your existing dimensions, which restores any recoverable compression detail. Past that ceiling the extra bytes are metadata rather than picture data — real detail cannot be created without adding pixels.
Is it safe for passport photos and signatures?
Yes. The file is decoded and re-encoded by your own browser — no upload, no server, no storage. After the page loads you can switch the network off and the tool keeps working.
What happens if my file is already bigger than the target?
The button changes to “Make it … KB” and the tool compresses instead, keeping the same dimensions wherever it can. Only if the target is smaller than those pixels can produce at the lowest quality will it downscale — and it says so before you download.
Which formats are supported?
JPG, PNG and WEBP, up to 25 MB. HEIC files from an iPhone must be exported as JPG first — no browser can decode them natively.
Is there a limit on how much bigger the file can get?
No hard limit, but each format caps out. JPEG comment blocks add roughly 65 KB per segment and the tool chains as many as needed, PNG text chunks go far higher, and WebP allows large unknown chunks. Practically, anything from a few KB to several MB is reachable without touching a single pixel.