Compress any image to under 100KB entirely in your browser. Nothing is uploaded — everything stays on your device.
100KB
Exact Target
Any Format
Input Support
Precise
Binary Search
Private
No Uploads
Drop image here to compress to 100KB
JPEG, PNG, WebP, AVIF, HEIC. All processing stays in your browser.
The 100KB limit is common across a wide range of official upload systems. Phone cameras produce photos of 3 to 8MB by default, which is 30 to 80 times larger than the limit. This tool bridges that gap without requiring any software installation.
Job application portals
Many recruitment platforms cap profile photos and supporting documents at 100KB.
University admission forms
Student portal photo uploads typically require under 100KB to fit the system's constraints.
Government online forms
Passport photo uploads, ID submissions and license applications commonly require 100KB or less.
Professional membership applications
Industry bodies and certification portals often impose this limit on member photographs.
Most online compressors apply a fixed quality setting and hope the output happens to land near your target. This tool works differently. It runs a binary search over the encoder quality parameter, checking the output size at each step and adjusting up or down until the result is as large as possible while still fitting under 100KB.
This means you always get the highest possible quality for the target size, not just an arbitrary reduction. For very large images where even the lowest quality setting exceeds 100KB, the tool also scales the image dimensions progressively until the target is reached.
You've filled out the form, written the cover letter, gathered the documents. Then you hit the photo upload field and get a generic error: "File size exceeds the maximum limit." No explanation of what the limit actually is. No suggestion for how to fix it. Just a red message and a blocked submission. This happens to thousands of people every day on job portals, government forms, and university admission systems, and most of them have no idea why.
The 100KB limit exists because these systems were often built on older infrastructure where database storage was expensive and upload processing was slow. The engineers who built them set conservative file size caps that made sense at the time, and those limits never got updated even as phone cameras went from 2 megapixels to 50. Your phone doesn't know you're about to upload to a government portal. It just saves the best photo it can, and that photo is almost always between 2MB and 8MB. That's 20 to 80 times over the limit before you've even started.
This is the part that surprises people. A profile photo displayed at 200 by 200 pixels on a job portal needs very little data to look sharp. Even displayed at 400 by 400, a well-compressed 100KB JPEG is genuinely indistinguishable from a 3MB original. The quality loss only becomes visible at large print sizes or extreme digital zoom, neither of which any portal is doing with your photo.
The one situation where 100KB gets genuinely tight is a very high-resolution image with complex detail, like a scanned document or a photo taken in RAW mode. In those cases the tool will scale the dimensions down proportionally as well as compressing, which keeps the output clean rather than introducing blocky JPEG artifacts.
If you're on an iPhone and your upload keeps failing even after you've tried to compress it, the issue might not be the file size at all. iPhones save photos in HEIC format by default, a format that most portals flat-out don't accept. The portal rejects it before it even checks the file size, and you get the same unhelpful error message either way.
The fix is to convert to JPEG first. This tool handles that automatically when you drop in a HEIC file. It converts and compresses in a single step and outputs a standard JPEG under 100KB. If you want to fix the format issue separately first, the HEIC to JPG converter handles that on its own. Either way, output as JPEG when submitting to official portals. It's the one format every system accepts without question.
Most government portals, job application systems and university submission forms set a 100KB limit on uploaded images to keep database storage manageable and ensure fast processing. The limit is common for profile photos, scanned signatures and supporting documents. The system rejects files that exceed the limit regardless of how the image looks.
For most photographs taken with a phone, compressing to 100KB produces a result that is visually acceptable at the sizes these portals display images. A 3MB phone photo can typically be compressed to 100KB with no visible degradation at normal viewing sizes. Very large, high-resolution images may show slight compression at 100KB.
JPEG, PNG, WebP, AVIF and HEIC are all supported as input. The output is JPEG or WebP depending on your selection. JPEG is the safest choice for submission portals as it is universally accepted.
No. All compression happens entirely in your browser. Your image never leaves your device. You can verify this by disconnecting from the internet after the page loads, the tool still works.
The tool runs a binary search over the quality parameter of the JPEG or WebP encoder. It tries quality 45, checks the output size, then goes higher or lower depending on the result. It converges on the highest quality setting that still produces a file under 100KB in 6 to 8 iterations. If even the lowest quality setting produces a file over 100KB, the tool also reduces the image dimensions proportionally until the target is reached.
Image Compressor and Editor
Compress with quality control, crop, resize and watermark images.
HEIC to JPG
Convert iPhone HEIC photos to JPG before compressing.
PNG to JPG
Convert PNG to JPEG for much smaller files before compressing.
Images to PDF
Combine multiple compressed images into a single PDF for submission.
