Increase File File Size to 100KB Free
This tool makes a file exactly 100KB, which is what upload forms with a minimum size are checking. It adds inert padding rather than re-compressing, so the image is untouched. Free, no account, and your file stays on your own device.
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 100KB target
The target is already set to 100KB 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 100KB. Nothing was uploaded, so there is nothing stored anywhere for you to delete afterwards.
Why a form would reject a file for being too small
The form is not judging your image — it is judging its byte count, against a floor of 100KB. That rule was written to stop people uploading unreadable 5KB scans, and it has no way of telling those apart from a clean scan that simply compressed well.
Rescanning at a higher DPI would also clear the threshold, and if your scan really is hard to read that is the better fix. If it is fine and only the number is wrong, padding it is the honest shortcut: the bytes go into metadata areas that the file format reserves for data decoders ignore, and the person who opens the file sees exactly what you scanned.
What a 100KB file usually is
100KB is the single most common minimum in upload requirements, and it is the round number specifications reach for when they want "a proper scan, not a thumbnail". Visa applications, professional registration bodies and university admissions portals all use it, often as the floor of a 100KB–200KB band.
A 100KB JPG is roughly 1000×1000 pixels of photographic detail, or a colour scan of an A4 page at around 150 DPI. Documents at this size are comfortably readable, which is what the requirement is trying to guarantee.
Frequently asked questions
Will this reduce my image’s quality?
No. The padding goes into metadata areas that the file format reserves for data decoders ignore, so the image data is never decoded or re-compressed. What comes out is pixel-for-pixel identical, just larger on disk.
Is my file uploaded to a server?
No, and you do not have to take that on trust. Load this page, disconnect from the internet, and use the tool — it still works, which it could not do if your file had to reach a server. Nothing is transmitted, so there is nothing stored and nothing to delete afterwards.
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?
Because some upload forms enforce a minimum as well as a maximum, and 100KB is a common one. The minimum is meant to reject scans too low-quality to read, but it catches efficiently compressed files too. When your file is legible and simply small, making it bigger is the only thing standing between you and a successful submission.
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.