Increase File File Size to 150KB Free
To increase a file to 150KB, upload it to the tool below, confirm the 150KB target, and download the result. The padding is written into metadata the decoder ignores, so the file is byte-exact and visually unchanged. It runs in your browser — nothing is sent anywhere.
Increase JPG, PNG or PDF file size
Runs entirely in this browser tab. Your file is never uploaded.
Drag a JPG, PNG or PDF file here, or
Nothing is uploaded when you pick a file.
How it works
- 1
Choose your file
Drag a file onto the tool above or click to browse. It accepts JPG, PNG and PDF files, and the file is read directly by your browser rather than sent anywhere.
- 2
Confirm the 150KB target
The target is already set to 150KB on this page. You can change it to any other figure in KB or MB if the form you are filling in wants something different.
- 3
Choose how the size is added
The default pads the file with metadata areas that the file format reserves for data decoders ignore, so the image is untouched. Switch to "increase resolution" if you want more pixels as well as more bytes.
- 4
Download the result
Press the button and your browser saves the new file, at exactly 150KB. Nothing was uploaded, so there is nothing stored anywhere for you to delete afterwards.
When you would need a bigger file
Size floors turn up in the places with the most paperwork and the least flexibility — and 150KB is one of the numbers that appears most often. Immigration services, examination boards, professional registration bodies and bank onboarding forms all use them, and none of them will explain which end of the range you failed.
Because efficient compression is what causes the problem, the answer is not to make a worse image. Adding padding leaves the pixels exactly as they are and puts the file at 150KB, which is what the validator wanted all along.
What a 150KB file usually is
150KB usually appears as the midpoint of a 100KB–200KB requirement, and as the minimum on portals that handle multi-page documents rather than single photographs. Aiming for the middle of a stated band is sensible: it leaves room for the KB-versus-KiB disagreement between operating systems and validators.
At 150KB a scan holds an A4 page in colour at good quality, or a photograph at roughly 1200×1200 pixels.
Frequently asked questions
Will this reduce my image’s quality?
No, and that is the point of doing it this way. Adding bytes to metadata areas that the file format reserves for data decoders ignore changes the file’s size without touching the part of it that describes the picture, so there is no mechanism by which the quality could drop.
Is my file uploaded to a server?
No. The entire process runs in your browser using the File and Canvas APIs and pdf-lib. Your file is read from your own disk, changed in memory and handed straight back to you. You can confirm it by opening your browser’s Network tab while you use the tool — there is no upload request, because there is no upload endpoint.
What file formats are supported?
JPG (including .jpeg), PNG and PDF. Each one is padded using the structure its own specification reserves for data readers can ignore, so the output is always a valid file of that type.
Why would I need to increase file size instead of decrease it?
It is rarely a want, usually a requirement. A portal has refused the file for being below 150KB, the scan itself is fine, and rescanning it at a higher DPI means finding the document and the scanner again. Padding gets the number where it needs to be in seconds.
Is this free to use?
Yes — free, with no account, no watermark, no email address and no limit on how many files you run through it. Because the work happens on your own device rather than on a server, there are no processing costs to pass on.