Resize and re-encode JPG, PNG and WebP photos in the page to cut their file size. Pick a quality preset and an optional maximum width, and the result is the smaller file — or the original, honestly labelled, if the original was already smaller.
Nothing to show yet
Keeps the input format — a .jpg file
stays a .jpg file
Validated locally: file type, size and browser support are checked before anything runs
Preparing your file
Reading the file locally and checking that its type and size match what this tool expects. Nothing has been uploaded.
Converting locally
Canvas and createImageBitmap cover PNG, JPG and WebP natively.
You can leave this tab open in the background — the conversion keeps running on your device, and progress is reported when you come back.
Conversion complete
Your converted file is ready to download.
Nothing to show yet
Nothing to show yet
The converted file was assembled in your browser and is released when you leave or reset this page
Something went wrong
The conversion could not be completed. Nothing was uploaded, and no partial file was saved.
This conversion is not supported yet
Your file passed every local check, and this is exactly where the Image codecs engine takes over. It does not implement this particular input and output pair yet, so nothing was converted and no download was offered.
| Engine | Image codecs |
|---|---|
| Frontend module | static/engines/image-engine.js |
| Extra downloads | None — this tool runs on browser APIs alone |
| Runs in a worker | No — the browser is fast enough here |
| Processing | On your device |
This page is the integration point. When the engine lands, it is loaded here and the same six states drive the real conversion.
Resize and re-encode JPG, PNG and WebP photos in the page to cut their file size. Pick a quality preset and an optional maximum width, and the result is the smaller file — or the original, honestly labelled, if the original was already smaller.
For supported tools the file is read with the browser File API and held in memory on your device. It is validated, processed by the Image codecs engine in a Web Worker, and the result is handed back as a download. At no point is the file sent to a server.
The tool writes JPG, JPEG, PNG, WEBP. Formats differ in what they can represent, so expect transparency, colour depth and metadata to be handled differently depending on the format you choose.
Four steps, none of which involve an account.
Drop a jpg, jpeg, png, webp file onto the drop area or browse for it.
The output format is preselected as JPG. Change it if the tool supports other targets.
Everything happens on your device, so speed depends on your machine rather than a queue.
Save the result, then reset the tool to clear it from memory and start again.
These are the six states the workspace moves through. The live tool above uses the same markup; this panel shows each one side by side so the behaviour can be reviewed without converting anything.
1 Empty — no file chosen
2 File selected — ready to convert
3 Preparing — reading locally
Preparing your file
Checking the file type and size. Nothing has been uploaded.
4 Converting — progress reported
Converting locally
Runs in a Web Worker so the page stays responsive.
5 Completed — result ready
Conversion complete
Your converted file is ready to download.
# Release notes
- Faster image conversion
- **New:** Markdown to PDF
- Fixed line ending detectionRelease notes
Faster image conversion
New: Markdown to PDF
Fixed line ending detection
This is the completed state as designed. No file was converted and the download action is disabled, because the conversion engine for this tool has not been connected yet.
The converted file was assembled in your browser and is released when you leave or reset this page
6 Error — recoverable
That file could not be read
The file appears to be damaged or its contents do not match the
.jpg extension. Nothing was uploaded.
Answers specific to Image size reducer.
Yes. Image size reducer is free to use and needs no account, no sign-up and no email address.
This tool is being built for local processing, so the file is handled by your own browser. Until that engine is connected the page shows an explicit notice instead of pretending the conversion succeeded.
Accepted formats are JPG, JPEG, PNG, WEBP. The converter writes JPG, JPEG, PNG, WEBP.
PNG, JPG and WebP work in modern browsers. Other formats depend on the codecs available in your browser; when a format cannot be decoded, the converter reports that instead of returning a broken file.
Lossless formats such as PNG keep every pixel. Lossy formats such as JPG and WebP let you trade a small amount of quality for a much smaller file, and the tool will make that setting explicit.
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