Resize Image to 15KB — Free Online Compressor
Compress any image to 15 KB or less. Works with JPG, PNG, WebP and HEIC — ideal for signature scans and the tightest portal limits.
Opens the resizer with a 15 KB target already set
How to Resize an Image to 15KB
Upload your image
Drop it in or select it — a HEIC straight from an iPhone is fine. At 15 KB expect to cut the dimensions as well as the quality, and the tool does both in the same pass.
Tick "Compress to target file size"
The 15 KB target is already filled in when you arrive from this page, so there is nothing to type. The tool then works upward to the best quality that still fits inside 15 KB.
Download your 15 KB image
Click Resize and save the file. It will be at or below 15 KB, and you will get a warning instead of an oversized file if the target is out of reach.
Features
Where Do You Need a 15KB Image?
15 KB is an extremely tight limit. It is almost always a signature rather than a photograph — and signatures are one of the few upload requirements that look similar across very different countries, because a scan of ink on white paper needs so little data:
- Exam Signature Uploads (India) — IBPS bank exams ask for a scanned signature between 1 KB and 15 KB in JPEG at roughly 140×60px; SSC and the Railway Recruitment Board set comparable limits, always separate from the candidate photograph.
- Signature Fields on E-Government Forms — Wherever a form asks for a signature image rather than a typed name — tax portals, license renewals, benefit claims — the limit sits well below the one on the photo, because the authority expects a line drawing rather than a picture.
- Digital Signature Blocks in Contracts — E-signing platforms and document workflows store a signature image per user, and a small file keeps it crisp at every zoom level without bloating every document it is stamped into.
- Website Favicons and App Icons — A 16×16 or 32×32 site icon, a notification badge or an app store thumbnail has no reason to exceed 15 KB, and staying small means it renders before the rest of the page.
- Bandwidth-Constrained Public Services — Government services built for areas with limited connectivity cap uploads tightly on purpose — a form that only accepts 15 KB is a form that still works on a slow mobile connection.
Portals revise their limits without notice, so confirm the 15 KB figure on the official page for your own form before you submit.
Tips for the Best Quality at 15KB
- Use JPEG — at this size the difference between JPEG and PNG is dramatic.
- For signatures, aim for roughly 140×60px on a plain white background.
- Scan or photograph your signature on plain white paper in good light.
- Crop as tightly as you can — every extra pixel costs you quality at 15 KB.
- A good starting point for this size is around 140×60px.
Frequently Asked Questions
How do I compress a signature scan to 15KB?
Scan or photograph your signature on white paper, upload it, set the dimensions to about 140×60px, tick "Compress to target file size", enter 15 and select JPEG. That satisfies the 1–15 KB signature band used by IBPS and similar exam portals, and comfortably clears the looser signature limits on most other forms.
Why does my photo look poor at 15KB?
15 KB is very little data for a full photograph. If the image still looks rough, reduce the pixel dimensions first — a 140×60px signature or a 200×200px thumbnail holds up far better at 15 KB than a 600×800px portrait does.
What if the tool cannot reach 15KB?
The tool tells you when the target is unreachable rather than quietly handing back a larger file. When that happens, reduce the width and height and try again — smaller dimensions are the only way to go below the floor set by the pixel count.
Should the signature background be white or transparent?
White. Exam portals expect JPEG, which has no transparency, and a flat white background compresses far more efficiently than a noisy one — which matters a great deal at 15 KB.
Which format gives the smallest file at 15 KB?
JPEG, and at 15 KB the choice matters more than it does at any larger target. PNG is lossless, so it ignores a 15 KB instruction completely — a PNG export comes out whatever size the image dictates, which at this tier is many times over. WebP would be smaller again, but most government forms asking for 15 KB name JPEG explicitly, so use JPEG unless yours says otherwise.
Will the image still look acceptable at 15 KB?
Only if you bring the dimensions down to about 290×290 pixels along with it. That is roughly what 15 KB carries at decent quality; asked to cover a full 12-megapixel photo, the same 15 KB shows visible blocking around edges and in skin tones. Shrink the pixels first so the budget covers fewer of them, and convert to grayscale if your form permits it — that alone frees a useful share of 15 KB.
Can I upload a HEIC photo from my iPhone and get 15 KB out?
Yes — HEIC, JPG, PNG, WebP, BMP, TIFF, GIF, AVIF and SVG all work as inputs, so an iPhone photo goes straight to a 15 KB JPEG with no separate conversion step. That matters here because an untouched HEIC is usually a few megabytes, roughly 200× over 15 KB. Save as JPEG for the 15 KB target; PDF, PNG, WebP, BMP and TIFF are available too, but PNG cannot be compressed to a size.
Are my images uploaded anywhere?
No. The compression to 15 KB happens in your browser through the Canvas API, so the photo never leaves your device — nothing is sent to a server and nothing is stored. Open your network tab while the 15 KB target is applied and you will see no upload request at all. Squeezing a phone photo roughly 200× down to 15 KB is exactly the kind of job people hand to an unknown upload site while filing a form on a patchy portal connection; here the 200× reduction happens on your own machine, which is why it still works when the connection drops out mid-form and why it is safe for an identity document.
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