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Convierte megabytes a kilobytes y al revés, contando 1 MB como 1024 o 1000 KB. Escribe en cualquiera de las dos casillas.
1024 coincide con Windows y la mayoría de límites de subida; 1000 con macOS y los móviles.
1 MB = 1024 KB
Exactamente 1.048.576 bytes
El compresor apunta al número de la calculadora. Si lo cambias después de comprimir, pulsa «Aplicar ajustes» para rehacer los archivos. Las fotos no salen de tu navegador.
Comprime varias imágenes con configuraciones avanzadas. Compatible con JPEG, PNG, WebP, AVIF y más.
Arrastra imágenes aquí o toca para seleccionar
Compatible con JPEG, PNG, WebP, AVIF · Hasta 50 MB cada una
| Límite | En MB | En bytes | Objetivo |
|---|---|---|---|
| 20 KB | 0,0195 | 20.480 | |
| 50 KB | 0,0488 | 51.200 | |
| 100 KB | 0,0977 | 102.400 | |
| 200 KB | 0,1953 | 204.800 | |
| 500 KB | 0,4883 | 512.000 | |
| 1 MB | 1 | 1.048.576 | |
| 2 MB | 2 | 2.097.152 |
Upload forms state their limits in whatever unit the developer picked: "max 2 MB" on one site, "under 300 KB" on the next. Type a number in either box and the other one updates as you type. In the binary convention used by Windows and most upload checks, one megabyte is 1024 kilobytes; in the decimal convention used by macOS, phones and drive makers it is 1000. The switch above the boxes changes between the two. If your photo turns out to be too big, drop it into the compressor right under the calculator: it takes the number you typed as its target, and the compression runs in your browser without uploading the photo.
Computer memory is counted in powers of two, so early software treated a kilobyte as 1024 bytes and a megabyte as 1024 × 1024 = 1,048,576 bytes. Drive makers and the SI system use powers of ten, where a kilobyte is 1000 bytes and a megabyte 1,000,000. In 1998 the IEC introduced separate names for the binary units, kibibyte (KiB) and mebibyte (MiB), but most software still writes KB and MB for both.
The gap is small for a single photo and grows with size: 1 MB is 1024 or 1000 KB, a 2.4% difference, while 1 GB is 1,073,741,824 or 1,000,000,000 bytes, about 7%. It is why the same 2,100,000-byte photo shows as 2.1 MB in macOS Finder and 2 MB in Windows Explorer.
Most server-side checks compare the raw byte count with a binary limit. PHP’s upload_max_filesize and nginx’s client_max_body_size both read "2M" as 2,097,152 bytes, so a "200 KB" limit on such a site is 204,800 bytes. Some forms use decimal units and mean 200,000. When a file is close to the line, aim under the smaller figure: a photo of 195 KB passes both readings of "200 KB".
The size your own computer shows matters as well. Windows Explorer reports binary units, while macOS Finder and the file managers on iPhone and Android report decimal ones. A file Finder lists as 205 KB is 200.2 binary KB, which a strict 200 KB check rejects.
Exam and government application portals often ask for a passport photo of 20 to 50 KB and a scanned signature of 10 to 20 KB. Job portals and visa forms tend to sit between 100 KB and 1 MB. Gmail caps attachments at 25 MB and Outlook.com at 20 MB. The table on this page lists the common sizes in both conventions; pick a row and it becomes the target of the compressor above it, which then works the photo down to that size. Like the calculator, the compressor runs entirely in your browser, so the photo is never uploaded on the way.
Choose the convention
Leave 1024 selected for Windows sizes and most upload limits, or switch to 1000 for sizes shown on a Mac or a phone.
Type a value
Enter megabytes in the MB box or kilobytes in the KB box. The other box and the exact byte count update as you type.
Compress the photo
Drop the photo into the compressor under the calculator. It aims for the limit you just typed; download the result when it is done.
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