Compress Image to 100KB
Selected
Original
Compressed
Add images to see compression results
Target size (KB)
A built-in 5% safety margin is applied (e.g. a 50KB target compresses to ≈47KB), so uploads are never rejected for being just over the limit.
Quality 5–100：
Could not reach target size
Lower the quality further or resize the image, then try again.
Transparent image — kept as PNG
Compress images to 100KB in one click
Online forms, school application systems and email attachments often impose a hard 100KB limit on images. Our tool binary-searches the optimal quality level to bring JPG, PNG, WebP or HEIC photos under 100KB while preserving as much detail as possible — all in your browser, no upload, no sign-up, no limits.
Common scenarios with a 100KB limit
| Scenario | Typical limit | Typical format |
|---|---|---|
| Online forms with a 100KB cap | Under 100KB | JPG |
| Web page images | Photo 100KB | JPG/PNG |
| Email attachments | 100KB – 2MB | Any |
| E-commerce product images | 100–500KB | JPG/WebP |
Photo rules for documents are set by the issuing authority, not by this tool, and they often specify a range rather than a single maximum — some online services also reject files that are too small. Always confirm the current requirements, including any lower size limit, on the official website that handles your application.
How to Compress an Image to a Specific Size
Upload your image
Drag & drop an image or click to select. You can upload several images at once.
Set the target size
Pick a preset (20 KB to 1 MB) or type an exact size in KB. The tool auto-adjusts quality and resolution to hit it.
Compress
Click Compress. Everything runs locally in your browser — your files never leave your device.
Download
Download the compressed images one by one, or grab everything as a ZIP.
Why choose this tool
Accurate results
Binary-searches the quality level so the output lands safely under 100KB while staying as close as possible.
Private, processed locally
Files are processed only in your browser and never uploaded, so even sensitive photos stay safe.
Batch processing + ZIP
Compress many images at once and download them all as a single ZIP.
Smart format & HEIC
Transparent images stay PNG automatically, and iPhone HEIC photos work directly — no conversion needed.
Frequently asked questions
How much quality do I lose at 100KB?
For ordinary photos, very little at the sizes forms actually use. The tool searches for the highest quality that still fits 100KB, so the result depends on the source: finely textured or noisy photos need stronger compression, while flat graphics reach the target easily. Screenshots and text stay crisp if you pick PNG output.
Which input formats are supported?
JPG, PNG, WebP, AVIF, BMP, GIF and iPhone HEIC/HEIF photos are all supported. Output can be JPG, PNG or WebP — pick based on whether you need transparency or the smallest size.
Will my photo dimensions change?
Only if needed to reach 100KB. The tool downscales first and compresses second, so it preserves as much resolution as possible. Very large originals may be reduced in pixels; smaller photos keep their full size.
Is it really true that files are not uploaded?
Yes. All compression happens locally in your browser; the script runs on the page and images never leave your device.
Can I compress images in bulk?
Yes. Drop up to 20 images at once, compress them together, and download all results as a ZIP. Perfect for preparing a batch of product photos or form submissions.
Ready to compress your images to 100KB?
No sign-up, no upload, unlimited use. Drop your images above, pick 100KB, and download compliant files in seconds.
Guides
Longer write-ups on the things these tools deal with: file formats, size limits, and the algorithms behind them.
Passport Photo Size Requirements: Pixels, DPI and KB
How passport and visa photo rules work: print size, pixels, DPI, and the file-size ranges upload systems actually enforce — including the minimum sizes many of them reject files for. Plus how to compress without blurring the face.
How to Reduce PDF File Size
Why PDFs get large, lossless structural optimisation versus lossy image re-encoding, unshrinkable scans, signature warnings, and hitting upload limits.