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Make your photos smaller without losing quality. Perfect for email, websites or social media.
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Your files never leave your browser. No data is stored on our servers for local tools.
Processing happens directly in your browser — instant, even for large files.
Our algorithms preserve every detail of your documents and images.
Just drag your photo into Zipero and you're done. In a few seconds, you'll have an image up to 90% smaller — with no visible difference in quality. Perfect for sending by email, posting on social media, or speeding up a website.
We support JPG, PNG, and WebP. No account needed — just upload and download. Everything works right in your browser, with nothing to install.
Your photos never leave your device. Nothing is uploaded to our servers. Close the tab and they're gone instantly — no trace left behind.
Image compression rests on a fundamental insight: the human eye is not a perfect sensor. It is far more sensitive to variations in brightness than to variations in colour, and it distinguishes edges and large shapes better than fine texture details in low-interest areas. Compression algorithms exploit these asymmetries to discard what you are not actually looking at.
JPEG divides the image into 8×8-pixel blocks and applies a mathematical transformation (DCT — Discrete Cosine Transform) to each one. The transformation decomposes the block into visual-frequency components. The high-frequency components — representing fine detail — are then quantised (their precision is reduced) in a controlled way. The higher the quality setting, the less aggressive this quantisation is. At 80–85%, artefacts are invisible; at 50%, blocky edges appear at boundaries.
WebP takes a different approach: prediction based on neighbouring blocks rather than DCT. This more sophisticated algorithm produces 25–35% less data at identical visual quality. PNG, by contrast, is lossless: it discards no information, but compresses raw pixel data via DEFLATE (the same algorithm as ZIP) after a prediction-filter preprocessing step. That is why PNG is optimal for logos and screenshots but inefficient on photographs.
Does compression visibly damage my photo quality?
At 70–85% quality, the difference is invisible to the naked eye in virtually every real-world scenario. Zipero uses a perceptual compression algorithm that prioritises areas of detail — faces, text, fine textures — and applies heavier compression only to uniform backgrounds and low-information areas.
What is the maximum file size I can compress?
Free accounts can process image files up to 20 MB per operation. Premium accounts raise this ceiling to 100 MB, which covers RAW-adjacent exports and high-resolution DSLR images in virtually every practical situation.
Can I compress multiple images at once?
Batch image processing is available on the Premium plan. On the free plan you process one image at a time — since each compression completes in a few seconds, the additional step is minimal even for moderate volumes.
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