TabBench

How to compress an image to 100KB

Updated

100KB is the common ceiling for bank KYC, visa applications, and university admissions — noticeably more generous than the 50KB exam portals demand. At this budget you can keep a genuinely sharp image, so the goal shifts from survival to quality.

The extra headroom means you can afford larger dimensions. Where a 50KB target forces you down to around 300px, 100KB comfortably supports 600–800px, which is the difference between a photograph that merely passes and one that looks professional when a reviewer opens it.

Open the Image CompressorFree, no signup, and the file never leaves your browser.

Step by step

  1. Aim for 600–800 pixels on the long edge

    This is the sweet spot for a 100KB budget. It is large enough to look sharp on a modern screen and small enough that the encoder is not fighting for every byte.

  2. Crop before resizing

    Removing irrelevant background first means the pixels you keep are spent on the subject. For a document scan, cropping away the desk around it often halves the file on its own.

  3. Target 100KB directly

    Set the size target and let the tool find the quality level that fits. At 600–800px this typically lands at quality 80–90, which is visually indistinguishable from the original.

  4. Verify text is still readable

    For scanned documents rather than portraits, zoom to 100% and check the smallest text. If it has softened, reduce dimensions slightly and re-run — legibility matters more than resolution for a document.

Things worth knowing

  • For scans of text-heavy documents, consider whether a PDF is accepted instead — it is often both smaller and clearer than a JPEG.
  • KYC portals frequently accept 100KB for the photograph but far less for the signature. Read both limits before starting.
  • If the file must also be a specific aspect ratio, crop to that ratio before resizing so nothing gets stretched.

Frequently Asked Questions

Is 100KB enough for a clear document scan?

Yes for a single page, if you resize sensibly. A page scanned at 800–1000px on the long edge and compressed to 100KB stays readable. Where 100KB fails is multi-page or very dense text, in which case a PDF is the better container.

Should I use JPEG or PNG for a 100KB target?

JPEG for photographs and scans of printed pages. PNG only for screenshots, line art, or images with sharp text edges — and be aware that a photographic PNG will not reach 100KB at any usable size.

How much quality do I actually lose?

At 600–800px and quality 80–90, effectively none that is visible at normal viewing size. The loss becomes noticeable below about quality 60, which a 100KB target rarely forces at these dimensions.