Resize Image to 100KB Online
Compress a photo, certificate scan, or ID card image to under 100KB without installing anything. Your file stays on your device.
What a 100KB limit is used for
100KB limits are common for scanned documents such as caste certificates, category certificates, ID proofs, and marksheets uploaded as images, and for photos on some university and state portals.
For documents, readable text matters more than colour detail. Scanning or photographing flat, in good light, and keeping the width around 1000–1200 px usually gives clear text under 100KB.
Recommended sizes for 100KB uploads
| Upload type | Suggested width | Notes |
|---|---|---|
| Certificate or marksheet scan | 1000–1200 px | Crop to the paper edges first |
| ID card (front or back) | 800–1000 px | Keep all four corners visible |
| Photograph | Up to 1000 px | Very good quality at 100KB |
If the form asks for a PDF instead of an image, use JPG to PDF or Compress PDF.
How to use it
- Upload your photo or scan (JPG, PNG, WebP, or HEIC).
- Choose 100KB, or type the exact limit from your form.
- Crop to the document edges and set width and height if required.
- Process and verify the KB size and dimensions, then download.
Tips for readable documents under 100KB
- Place the document on a dark, flat surface and shoot from directly above.
- Avoid shadows from your phone or hand across the paper.
- Crop tightly to the page — the background wastes file size.
- Increase contrast slightly if faint text becomes hard to read.
Frequently asked questions
How do I compress a scanned certificate to 100KB?
Upload the scan, crop to the page edges, keep the width around 1000–1200 px, and compress to 100KB. Check that the text is still readable before downloading.
Should I upload a JPG or a PDF?
Use whatever format the form asks for. If it needs a PDF, convert with JPG to PDF or compress an existing PDF with Compress PDF to 100KB.
Will my text become blurry?
At 100KB text usually stays clear if the image is not much wider than 1200 px. Reduce width rather than quality if you need a smaller file.
Can I resize several documents at once?
This tool handles one image at a time so you can check each result before uploading.
Is my document uploaded anywhere?
No. Processing happens entirely in your browser.
Does it work on mobile?
Yes, on Android and iPhone browsers.
Related tools
Tiny signature and thumb slots.
Resize image to 20KB →For signatures and small photo slots.
Resize image to 50KB →The most common exam photo limit.
Resize image to 200KB →Scans and high-quality photos.
Signature resize 10KB–20KB →Hit both the minimum and maximum.
Resize image in KB (any size) →Any KB limit and pixel size.
Image compressor (bulk) →Compress up to 20 images at once, download as ZIP.
Compress PDF to 100KB →When the form needs a PDF instead.
Helpful guides
- Reduce Photo Size in KB on Your Phone (Android & iPhone) — A step-by-step way to shrink a phone photo to 20KB, 50KB or 100KB for an online form without making it blurry — and why the obvious shortcuts fail.
- KB vs Pixels vs DPI: What Photo Upload Forms Check — Does 200 DPI change the KB? How many pixels is 3.5×4.5 cm? Which number does the portal check? KB, pixels and DPI explained with worked examples.
- Exam Photo Rejected? 10 Common Reasons and How to Fix Each — Wrong pixel size, a file outside the KB range, HEIC instead of JPG, a sideways photo: 10 reasons portals reject photos and signatures, with a fix for each.