compress image to 100 kb for catalogue thumbnails
Use this page to compress image to 100 kb when a catalogue grid or a comment box caps each picture so the page stays light. A small photo may already sit under 100 KB.
Preset: Compress image to 100 KB
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Steps to compress image to 100 kb
- Add the picture with Choose files, or drop it. It stays in this tab while you compress image to 100 kb.
- Confirm the target reads 100 KB. Format stays on keep, so a JPEG stays a JPEG and a PNG stays a PNG.
- Run the compress. JPEG and WebP use a quality binary search, then a scale ladder if the file is still too big. A PNG is posterised and then scaled, because a lossless pass often cannot hit a small cap.
- Download the picture and compare its size with 100 KB before you upload it to the form.
How this target is applied
If the picture stays a JPEG or WebP, the tool runs a quality binary search and then a scale ladder if needed. It tries middle qualities and keeps a result that lands under 100 KB.
If the picture stays a PNG, a lossless pass often cannot hit a small cap. The tool posterises and then scales. A flat icon shrinks more willingly than a photograph that was saved as PNG. A small photo can already be under 100 KB.
Why 100 KB is the cap
Catalogue grids and comment boxes often cap a picture at 100 KB so a page of products still loads. The format stays whatever you started with. The search cares about bytes, not about converting to another type. A small product photo may fit with a modest quality drop. A full camera frame usually needs the scale ladder too.
Match 100 KB when that is the number in the upload rules.
What 100 KB does to the picture
Expect a small photo and a large photo to take different paths. The small one may already fit, so you mostly keep the current look.
The search stops at the first result under 100 KB. If nothing fits, you still get the smallest file it made, and you can see that the cap was missed.
Limits, formats and output
| Accepted input | JPEG, PNG, WEBP, GIF, BMP, HEIC, AVIF |
|---|---|
| Files per batch | 1–100 |
| Soft size warning | 50 MB each |
| Hard stop | 500 MB total in memory |
| Output | The chosen image format, or a ZIP for a batch |
| Account | None. The tool runs in this tab. |
Your file never leaves your device
Your image is processed only in this browser and is never uploaded. The work runs in a Web Worker in this tab, using WebAssembly for the heavy parts, and the result comes back as a local blob. This site does not upload the file, store it, or log its name.
To verify: load the page, turn on airplane mode, and drop the file again. It still finishes. Or open DevTools, choose Network, and watch the run: there is no upload. The architecture is described on How it works.
Frequently asked questions
Will a small photo already be under 100 KB?
Often, yes. A small photo that is already under 100 KB can come back close to the size you started with, because the search stops once the file fits. A large camera original is the opposite. It usually needs lower quality and, if that is not enough, a smaller width from the scale ladder.
How does the image target search work?
JPEG and WebP take a quality binary search, then a scale ladder if needed. The search keeps the first result under 100 KB and does not continue after a hit. PNG files on this keep format preset posterise and then scale, because a lossless pass often cannot hit a small cap.
Will the format change?
Format is set to keep, so a JPEG stays a JPEG, a PNG stays a PNG, and a WebP stays a WebP. The target is about bytes. If a form demands JPEG bytes specifically, use a JPEG target instead of this keep format preset.
What if the picture cannot reach 100 KB?
You get the smallest file the search produced, and you can see that it is still over 100 KB. A very detailed photo aimed at a tight cap is the usual reason. Cropping to the subject first gives the compressor less picture to store.
Will a photo suffer more than a logo?
A flat logo or a screenshot loses less at 100 KB than a detailed photo, because smooth areas compress well. A face, foliage, or a product texture shows blockiness sooner. If the picture matters, use the largest cap the form allows rather than the smallest number on this site.
Last updated 2026-09-26. By Tam.