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Compress Images
Make your photos smaller without losing quality. Perfect for email, websites or social media.
1
Upload2
Process3
DoneDrag & drop files here
or click to browse from your computer
MAX SIZE: 20 MB
Fast Private
Stockage portable
Samsung T7 SSD 1 To
89€env.
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Privacy Guaranteed
Your files never leave your browser. No data is stored on our servers for local tools.
Ultra-Fast Speed
Processing happens directly in your browser — instant, even for large files.
No Compromise Quality
Our algorithms preserve every detail of your documents and images.
Smaller photos, same quality — it's that simple.
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.
How to compress an image with Zipero
- 1Drag and drop your JPG, PNG, or WebP image into the upload area, or click to browse your files from your computer or phone.
- 2Choose your target quality level using the slider. A setting of 75–85% is a great starting point — it cuts file size dramatically while keeping the image looking identical to the naked eye.
- 3Click Compress, then Download. Your optimised image is ready in seconds, still on your device, never uploaded anywhere.
When is image compression useful?
- ▸Sending photos by email: most email providers cap attachments at 10–25 MB. Compressing a photo from 8 MB down to under 1 MB keeps every detail intact while making it sendable without triggering size limits.
- ▸Publishing on a website or blog: large images are the single biggest cause of slow page loads. Compressed images improve your Core Web Vitals scores, reduce hosting bandwidth costs, and make your visitors' experience significantly faster.
- ▸Sharing on WhatsApp or social media: platforms re-compress images on upload, often harshly and unpredictably. Pre-compressing at high quality lets you control the result instead of letting the platform decide — your images arrive looking exactly as intended.
How image compression works — the algorithms explained
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.
Frequently asked questions about image compression
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.
Related articles
How to Reduce Photo Size on Your Smartphone
Modern camera phones produce files of 5–15 MB. How to reduce them without touching perceptible visual quality.
DPI vs Resolution: Understanding the Difference
DPI and resolution are frequently confused. Here's what each term actually means and when it matters.
Preparing Images for Social Media: Formats and Sizes
Every platform has its own recommended dimensions and formats. The guide to publishing sharp images without visible recompression.
Stockage portable
Samsung T7 SSD 1 To
89€env.
View on Amazon
Amazon affiliate link — supports Zipero for free. Go Premium to remove.