Exam & application forms
Resize Image to 20 KB
Preset and ready: drop a file and the output lands under 20 KB as JPEG — processed entirely in your browser.
Drop your image here or browse
JPEG, PNG, WebP — everything stays on your device
Why this exact limit matters
Forms that say "20 KB" are not asking you to resize — they are asking the file to weigh less than 20 kilobytes, however you get there. The subtle trap is that resizing is only sometimes the answer: for an already-modest 1500×1800 scan, 20 KB is reachable at full frame (with quality taking the hit), while for a 6000×4000 camera original the frame must come down. The engine decides which world you are in, automatically.
These portals enforce their limit at the byte level, so the only reliable approach is to work backwards from the number itself and let the encoder find the best quality that fits underneath it. 20 KB is one of the tightest limits you will meet online, and this page is preset to exactly that ceiling.
How to compress to 20 KB
- Drop your image into the box above — it stays on your device.
- Confirm the target: under 20 KB as JPEG.
- The MozJPEG encoder searches its quality range so the JPEG output lands just under your limit. Dimensions are left at their original size unless the target demands otherwise.
- Preview the result, compare it with the original if you want, and download — the filename carries its actual size.
Tip: Before you upload, check whether your form also specifies pixel dimensions — if it does, fill in the max width and height here so both constraints are satisfied in one pass.
Measured: when 20 KB does not require resizing at all
A 914 KB, 1500×1800 portrait file against a bare 20 KB ceiling — the engine never touched the dimensions:
Source file
914 KB
1500×1800 JPEG
Output
16.4 KB
56× smaller
Quality setting
q3
bottom of ladder
Resolution
1500×1800
unchanged
Contrast this with the 3.2 MB camera original on our 10 KB page, where the engine had to shrink the frame to 33%: same logic, different verdicts based on the file. For exam forms, the practical recipe is unchanged — if the form names pixels (IBPS: 200×230), enter them, and the same 20 KB buys quality 89 instead of quality 3.
Frequently asked questions
The form wants 20 KB and specific pixels — which field wins?
Both must be satisfied simultaneously. Enter the pixel cap and the KB target together; the engine fits inside the frame, then maximizes quality under the ceiling. Neither constraint is sacrificed for the other.
Why does my output look worse than a friend’s at the same 20 KB?
Their file probably started smaller or better framed. Bytes-per-pixel is what matters: the same 20 KB over 0.05 megapixels looks sharp, over 2.7 megapixels looks rough. Crop close before compressing.
Does the tool ever enlarge my image to meet a portal’s pixel minimum?
Never — enlarging invents pixels and degrades the photo. If your source is below a stated minimum, rescan or re-export at higher resolution, then compress here.
My form rejected the file even though it shows the right size — what do I check?
Re-check the exact limit and the required format. Some portals quietly expect JPEG even when they say "image", and a few measure in 1,000-byte units rather than 1,024. Try the next lower round number here if the rejection persists.
Why JPEG and not another format for my upload?
JPEG is the most universally accepted image format on upload forms and gives the smallest files for photographs. If your destination accepts only "images", JPEG is the safe choice.
Do I need an account or app install?
No account, no install, no watermark. The page you are on is the whole tool.