Are my images uploaded to a server?

No. Everything runs in your browser on your device — your images never leave your computer or phone.

Does it work on mobile?

Yes. It’s fully responsive and works in Chrome, Safari, Firefox and Edge on phones, tablets and desktops.

4X Image Upscaler

4XImageUpscalerimprovesclarityanddetailonyourdeviceusingfastimageprocessing—sharpening,edge-preservingsmoothing,denoise,toneandhigh-qualityresampling.Adjustthesliders,comparewiththeoriginal,thendownload.Yourphotoisneveruploaded.

Free forever100% PrivateNo uploadWorks offline

Processing happens in your browser · No upload

This tool processes your image locally in your browser. Your file is never uploaded to a server, so nothing needs to be deleted afterwards — closing the tab removes it completely.

How to use 4X Image Upscaler

11
Upload your image
Drag&droporbrowse.Yourfilestaysonyourdevice—itisneveruploaded.
22
Adjust the sliders
Setsharpen,skin/surfacesmoothing,denoiseandtone.Pickanupscalefactor(2×or4×)whereoffered.
33
Compare
Pressandholdtheimagetoseetheoriginal,soyoucandialinanaturalresult.
44
Apply & export
Werenderthefull-resolutionresultonyourdevice.Downloadtheenhancedimage.

Key features

Sharpen,denoise&edge-preservingsmoothing
High-quality2×/4×upscaling
Before/aftercompare
Realon-deviceprocessing—notaplaceholder
100%free—nosign-up,nowatermark
Runsinyourbrowser—imagesneverleaveyourdevice
WorksonChrome,Safari,FirefoxandEdge(desktop&mobile)

Why use 4X Image Upscaler?

4XImageUpscaleristhefastestprivatewaytogetthejobdone.Becauseeverythingrunslocallyinyourbrowser,therearenouploads,noqueuesandnoprivacyrisk—idealforIDs,documentsandpersonalphotos.Itisfree,unlimitedandworksonanydevice.

100%

Free

∞

Private

All

Devices

Benefits

Genuinelyimprovesclaritywithsharpening,denoiseandedge-preservingsmoothing—notaplaceholder.
Optional2×or4×high-qualityupscalingforlarger,crisperoutput.
Press-and-holdbefore/aftersoyoucandialinanaturalresult.
Yourfileisprocessedonyourdevice—thereisnoupload,soIDsandpersonalphotosstayprivate.

Common use cases

Sharpeningasoftorlow-qualityphotobeforeprintingorposting.
Enlargingasmallimagewhilekeepingitcrisp.
Smoothingskinandbrighteningaportrait.

Helpful tips

💡

Previewtheresultbeforedownloading—youcanalwaysadjustandre-runinstantly.

Troubleshooting

⚠Myimagewon’topenorupload.: Makesureit’sasupportedformat(JPG,PNG,WEBP).HEICandcamera-RAWdependonyourbrowser;convertthemtoJPGfirstifneeded.
⚠Nothingisuploaded—isitreallyworking?: Yes.Thetoolrunsinyourbrowser,soprocessinghappensonyourdevicewithnoserverround-trip.Youcanevenuseitofflineafterthepageloads.