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.

Signature Resizer

Resizeyourdigitalsignatureto50mm×20mmat300DPI—themostcommonexamportalrequirement.

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 Signature Resizer

11
Upload your image
Drag&droporbrowse.Yourfilestaysonyourdevice—itisneveruploaded.
22
Set size & DPI
Enterthesizeincm,mmorinchandaDPI(300forprint).
33
Resize
Weconvertyourphysicalsizetoexactpixelsandresample.
44
Download
Previewtheresult,checkthesize,thendownload.Use“Delete&startover”toclearitinstantly.

Key features

cm/mm/inchwithcustomDPI
Exactprintsizing
100%free—nosign-up,nowatermark
Runsinyourbrowser—imagesneverleaveyourdevice
WorksonChrome,Safari,FirefoxandEdge(desktop&mobile)

Why use Signature Resizer?

SignatureResizeristhefastestprivatewaytogetthejobdone.Becauseeverythingrunslocallyinyourbrowser,therearenouploads,noqueuesandnoprivacyrisk—idealforIDs,documentsandpersonalphotos.Itisfree,unlimitedandworksonanydevice.

100%

Free

∞

Private

All

Devices

Benefits

Convertsreal-worldsizesat300DPIintoexactpixelsforprint-accurateoutput.
Switchbetweencm,mmandincheswithoutdoingthemathyourself.
Yourfileisprocessedonyourdevice—thereisnoupload,soIDsandpersonalphotosstayprivate.

Common use cases

Sizingphotosforprintatcm/mm/inch.
Preparingdocumentsthatspecifyphysicaldimensions.

Helpful tips

💡

Use300DPIforprintand72–96forscreen-onlyuse(thistooldefaultsto300).

Troubleshooting

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