---
title: "Compress image to 4 MB — free, saved as JPG | Herofab"
description: "Compress photos under 4 MB in your browser. Saved as JPG and never cropped: quality first, pixel size only when needed. Free; nothing is uploaded."
url: https://herofab.app/tools/compress-image-to-4mb
language: en
updated: 2026-10-19
---

# Compress an image to 4 MB.

Drop your photos and download each one as a JPG under 4 MB. The quality is lowered first and the pixel dimensions only when that is not enough; the photo is never cropped. It runs in your browser; nothing is uploaded.

![Black-dial watch with a mesh strap on white, three-quarter view · Compress image to 4 MB](https://herofab.app/img/ex/watch-packshot-1100.webp)

Made with Herofab · Packshot studio

## Under 4 MB per image, saved as JPG

Limits come from each platform's own help pages, summarised in the [guides](https://herofab.app/guides/) (checked 24 September 2026).

## Who asks for 4 MB.

Lines from Herofab's platform guides that name 4 MB, as a limit, a recommendation or one end of a range. Each row links to the guide and its official source.

| Platform | Rule | What the guide says | Read |
| --- | --- | --- | --- |
| [ABOUT YOU](https://herofab.app/guides/about-you-product-image-requirements) | File | JPEG up to 2 MB (white or grey background); PNG up to 4 MB (transparent background) | 10 October 2026 |
| [Webflow](https://herofab.app/guides/webflow-ecommerce-product-image-size) | File size | 4 MB maximum for each image | 12 October 2026 |
| [Webflow](https://herofab.app/guides/webflow-ecommerce-product-image-size) | Size | Any image size can be uploaded provided the file is smaller than the 4 MB limit; WebP images have a side length limit of 16,383 pixels | 12 October 2026 |
| [SHOPLINE](https://herofab.app/guides/shopline-product-image-size) | Recommended | 1,600 pixels wide or wider, with a file size under 4 MB for optimal performance | 12 October 2026 |

[Webflow image compressor](https://herofab.app/tools/webflow-image-compressor)

## 4 MB in numbers.

Counted as the compressor counts: 1 KB is 1,000 bytes and 1 MB is 1,000,000 bytes. Bits per pixel divides the limit in bits by the pixels of a 12-megapixel phone photo (4,032 × 3,024 px) kept at full size; the uncompressed size counts 3 bytes per pixel.

- **Bytes:** 4,000,000
- **Bits:** 32,000,000
- **Pixels in a 12-megapixel phone photo:** 4,032 × 3,024 = 12,192,768
- **Bits per pixel at full size:** 32,000,000 ÷ 12,192,768 = 2.62
- **Uncompressed, 3 bytes per pixel:** 36,578,304 bytes, 9.14 times the limit

## Other limits.

[100 KB](https://herofab.app/tools/compress-image-to-100kb) · [500 KB](https://herofab.app/tools/compress-image-to-500kb) · [1 MB](https://herofab.app/tools/compress-image-to-1mb) · [2 MB](https://herofab.app/tools/compress-image-to-2mb) · [3 MB](https://herofab.app/tools/compress-image-to-3mb) · [5 MB](https://herofab.app/tools/compress-image-to-5mb) · [6 MB](https://herofab.app/tools/compress-image-to-6mb) · [8 MB](https://herofab.app/tools/compress-image-to-8mb) · [10 MB](https://herofab.app/tools/compress-image-to-10mb) · [Image compressor](https://herofab.app/tools/image-compressor)

## 4 MB, answered.

**Which platforms ask for 4 MB?**

ABOUT YOU, Webflow, and SHOPLINE. The table on this page gives each rule in full and links to the platform's guide.

**How many bytes is 4 MB?**

4,000,000 bytes: the compressor counts 1 MB as 1,000,000 bytes, the stricter of the two common readings. Counted in units of 1,024, 4 MB would be 4,194,304 bytes, so a file under 4,000,000 bytes is under the limit on either count.

**How many bits per pixel does 4 MB leave for a 12-megapixel photo?**

2.62, if the photo keeps all 12,192,768 pixels (4,032 × 3,024): 32,000,000 bits divided by 12,192,768. Uncompressed, at 3 bytes per pixel, the photo is 36,578,304 bytes, 9.14 times the limit. The compressor lowers the JPG quality first and reduces the pixel dimensions only when that is not enough.