Comprimi immagini online

Riduci le dimensioni dei tuoi file JPG, PNG e WebP istantaneamente. Gratuito, senza limiti e completamente privato — nulla viene caricato su alcun server.

100% Privato — I tuoi file non lasciano mai il tuo dispositivo. Tutta l'elaborazione avviene nel tuo browser.

Trascina le tue immagini qui

o clicca per selezionare — JPG, PNG, WebP supportati

Come funziona il compressore di immagini?

Questo strumento utilizza le capacità di elaborazione immagini integrate nel tuo browser (Canvas API) per ricodificare le tue immagini con un'impostazione di qualità inferiore. L'intero processo viene eseguito localmente sul tuo dispositivo — le tue immagini non vengono mai inviate a nessun server. Nemmeno un byte lascia il tuo computer.

Tips for Better Image Compression

  • Start at 80% quality — For most photographs, a quality setting between 75–85% offers the best balance between file size and visual fidelity. The human eye rarely notices differences above 80%.
  • Choose WebP for modern use — If your images are destined for the web, WebP delivers 25–35% smaller files than JPEG at equivalent quality. All major browsers now support it.
  • Use JPEG for photos, PNG for graphics — JPEG compression excels with photographic content. PNG is better for screenshots, logos, and images with sharp edges or text.
  • Compress before uploading — Reducing file size before uploading to social media, email, or your website saves bandwidth and speeds up load times.
  • Batch process for efficiency — Drop multiple images at once to compress an entire folder in seconds. Use "Download All" to grab everything in one click.
  • Compare before and after — Always check the file size reduction shown in the results. If the savings are minimal, try lowering the quality slider by 5–10 points.
  • Keep originals as backup — Since compression is lossy (for JPEG/WebP), always keep your original high-resolution files.

When to Compress Your Images

  • Website optimization — Large images are the #1 cause of slow-loading websites. Compressing product photos, hero banners, and blog images can cut page load times by 40–60%.
  • Email attachments — Most email providers limit attachment size to 25 MB. Compressing high-resolution photos lets you share more images in a single email.
  • Social media uploads — Platforms like Instagram, Facebook, and Twitter re-compress your images anyway. Pre-compressing gives you more control over the final quality.
  • Cloud storage savings — If you sync thousands of photos to cloud services, compression can free up significant storage space without noticeable quality loss.
  • E-commerce product listings — Online marketplaces often have file size requirements. Compressed images load faster in search results.
  • Document preparation — When embedding images in PDFs, Word documents, or presentations, compressed images keep the document file size manageable.

Domande frequenti

È davvero gratuito?
Sì, completamente gratuito e senza limiti nascosti. Siamo finanziati dagli annunci mostrati sulla pagina — non vendiamo mai i tuoi dati né accediamo ai tuoi file. Comprimi quante immagini vuoi, tutte le volte che vuoi.
Le mie immagini sono al sicuro?
Le tue immagini non lasciano mai il tuo dispositivo. C'è zero traffico di rete durante l'elaborazione — puoi verificarlo aprendo gli Strumenti per Sviluppatori del tuo browser (scheda Rete). Fisicamente non possiamo vedere né accedere ai tuoi file.
Quali formati sono supportati?
Puoi comprimere e convertire tra i formati JPEG, PNG e WebP. Importa uno qualsiasi di questi formati e scegli il formato di output desiderato.
Perché il mio file PNG è più grande dopo la compressione?
PNG è un formato senza perdita — il cursore della qualità non ha effetto sull'output PNG. Se hai bisogno di un file più piccolo, prova a convertire in JPEG o WebP.
Cos'è WebP?
WebP è un formato immagine moderno sviluppato da Google che offre una compressione superiore per le immagini sul web. Tipicamente raggiunge dimensioni di file del 25-35% inferiori rispetto a JPEG a qualità visiva equivalente.
Funziona offline?
Sì! Una volta caricata questa pagina, puoi disconnetterti da internet e lo strumento continuerà a funzionare perfettamente poiché tutta l'elaborazione viene eseguita localmente.
What is the difference between lossy and lossless compression?
Lossy compression (JPEG, WebP) permanently removes some image data to achieve smaller files — the lower the quality setting, the more data is discarded. Lossless compression (PNG) reduces file size without any quality loss by finding more efficient ways to encode the same data. For photographs, lossy compression at 80% quality is usually indistinguishable from the original.
Can I compress multiple images at once?
Yes! Simply drag and drop multiple files or select several images at once. ImgLab will compress all of them using your chosen quality setting and output format. Use the "Download All" button to save every compressed image in one click.
What quality setting should I use?
It depends on your use case. For web images, 70–80% offers a good balance. For print or archival purposes, stay above 90%. For social media where platforms re-compress anyway, 75% is usually sufficient. The preview lets you compare quality before downloading.
Is there a file size limit?
There is no hard limit since everything runs in your browser. However, very large images (50+ MP) may be slow to process depending on your device's memory and processing power. For best performance, images up to 20 MP work smoothly on most devices.
Does compression remove image metadata (EXIF data)?
Yes — when ImgLab compresses your image using the Canvas API, metadata such as EXIF, IPTC, and XMP data is automatically stripped. This includes camera settings, GPS coordinates, and timestamps. If you need to preserve metadata, consider using our Metadata Viewer to inspect it first.
How much can I reduce my file size?
Typical results vary by source image and format. A 5 MB JPEG photo at 80% quality usually compresses to 1–2 MB (60–80% reduction). Switching to WebP can yield even better results — up to 35% smaller than the equivalent JPEG. PNG files with many colors may see modest reductions, while screenshots and graphics with flat colors can shrink dramatically.

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