ConvertFast

Free image size checker for upload forms

Drop a photo to see its exact KB, pixel size and DPI, and enter your form's limits to see whether it passes before you upload. Your file is never uploaded: it is processed in your browser, because ConvertFast respects your privacy. Your first conversion each day needs no sign-up; sign in with Google for 2 more.

Your file is not uploaded. It is processed right here in your browser, on your own device, because ConvertFast respects your privacy. If you sign in with Google after your first free try, only your email address is sent to us.

ConvertFast: Beyond Conversion

ConvertFast

Free web tool · No upload, processed on your device

Free: 1 try + 2 with Google / day

Image Tools

All free tools
KBImage CompressorCompress to exact KB⇄Image ConverterJPG / PNG / WebP⤢Image ResizerExact width x heightⓘEXIF RemoverRemove GPS & metadataIDPassport Photo ResizerCommon photo sizes + KB✍Signature ResizerSignature for exam forms

Image Size Checker

KB, pixels and DPI check

Files 0

ConvertFast works with a wide variety of file formats: see all 134 formats. Whole folders, no daily limit, fully offline.Get ConvertFast

Don't want to upload your files anywhere? Use ConvertFast.

ConvertFast is a desktop app for Windows, macOS and Linux with 134 formats, 2,388 conversion paths and 19 utilities. Everything runs on your computer, with no daily limit. One-time payment of $24.99 (regular $49.99) for 2 devices. See all supported formats.

Get ConvertFastTry the interactive demo

Why does a form reject my photo when Windows says it is small enough?

Windows counts 1024 bytes per KB, while many forms count 1000. The checker shows both numbers so you can see the real size.

What if my photo fails?

Use the free image compressor to reach the KB limit, or the image resizer to change the pixel size, then check again.

Are my files uploaded?

No. Your file is processed in your web browser on your own device, because ConvertFast respects your privacy. Your first conversion each day needs no sign-in; after that, you sign in with Google and only your email address is sent to us, to apply the free daily limit.

Why is there a daily limit?

These web tools are a free sample of ConvertFast. The desktop app has no limit and also handles whole folders, HEIC and RAW photos, PDFs, audio and video offline on Windows, macOS and Linux.

Why sign in with Google?

It takes one click, there is no password to create and no code to wait for, and it keeps bots and fake sign-ups out. After you sign in once, the same browser remembers you. We only receive your email address.

More free image tools

Other free tools and guides