Compress images for Heureka.
Drop your photos and download them under 2 MB, the file-size limit in Heureka's image rules. The quality is lowered first and the pixel dimensions only when needed; the photo is never cropped. It runs in your browser; nothing is uploaded.
Under 2 MB per image, saved as JPG
Limits come from each platform's own help pages, summarised in the guides (checked 24 September 2026).
What Heureka asks for.
Source: Heureka — Jak správně posílat obrázky · checked 27 September 2026
Heureka feed images: at least 20 × 50 px and 30 kB, 175 × 175 px recommended, at most 4,096 × 4,096 px and 2,000 kB; ideally white, not transparent.
- Limit used
- Under 2 MB per image, saved as JPG
- Pixels kept
- A photo with a side over 4,096 px is scaled down to that limit first. The shorter side stays at 20 px or more. The longest side stays at 50 px or more.
- Size
- At least 20 × 50 or 50 × 20 pixels and 30 kB, with at least 175 × 175 pixels recommended; at most 4,096 × 4,096 pixels and 2,000 kB
- Formats
- JPEG and PNG are supported on both official pages; the XML feed specification also lists WebP and BMP, while the image help page says only .jpeg, .png and .jpg are currently supported
Compressors by platform.
Compressing for Heureka, answered.
What is the image file-size limit on Heureka?
2 MB per image, according to the rules summarised in the Heureka guide. This tool saves each photo as a JPG under that size.
Is JPG accepted on Heureka?
Yes. The formats Heureka lists are JPEG and PNG.
Does compressing for Heureka change the pixel size?
Only when lowering the quality is not enough to get under 2 MB. A photo with a side over 4,096 px is scaled down to that limit first. The shorter side stays at 20 px or more. The longest side stays at 50 px or more.
Where do these figures come from?
From Heureka — Jak správně posílat obrázky, read on 27 September 2026. Marketplaces update their rules; the official page is the final reference.
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