Comprimir Imagem Online Grátis
Diminua o tamanho de fotos JPG, PNG e WebP para o valor exato em KB (para ENEM, vestibulares e concursos) sem perda visível de qualidade. Processamento 100% local no seu aparelho.
Arraste e solte suas imagens aqui
ou clique para selecionar do seu aparelho (JPG, PNG e WebP)
How to Compress Images to Exact KB Without Quality Loss (Step-by-Step)
Reduce JPEG, PNG, and WebP file sizes by up to 80% while preserving crisp visual fidelity for websites, email attachments, and government application portals:
Click 'Select Image' or drag and drop your JPG, PNG, or WebP photo into the upload dropzone. Files up to 50MB are supported.
Choose between 'Smart Auto Compression', adjust the manual quality slider (1% to 100%), or specify an exact target size (e.g., under 50KB or 20KB for official forms).
Inspect the instant before-and-after comparison view showing exact original size, new compressed size, and percentage savings with zero server latency.
Click 'Download Compressed Image' to save your lightweight, high-performance image instantly with 100% client-side privacy.
Exact KB Target Compression for Government Portals & Online Applications
One of the most frustrating digital tasks is uploading identity photos, signatures, or scanned documents to official government recruitment portals, university admission forms, and passport renewal websites that impose strict file size limits (e.g. "Must be between 20KB and 50KB" or "Maximum file size 100KB").
Most basic compressors only offer arbitrary 'Low / Medium / High' presets that either leave your photo at 75KB (rejected) or compress it into an unrecognizable blurry artifact.
With our dual-slider controls, you can adjust the Quality and Scale percentages simultaneously. Reducing image scale by just 10%–15% cuts total pixel count by nearly 30%, allowing you to hit exact targets like 20KB, 50KB, or 100KB while maintaining sharp facial features and crisp signature lines.
The Science of Client-Side Image Compression
High-resolution photography and graphic assets account for over 60% of average web page weight. Unoptimized images slow down page load times, degrade Google Core Web Vitals (specifically Largest Contentful Paint - LCP), and increase mobile data costs for visitors.
Our Image Compressor uses browser-native HTML5 Canvas memory buffers to compress JPEG, PNG, and WebP graphics by 60% to 85% while preserving crisp visual clarity. The entire compression process executes 100% locally on your computer or smartphone, providing complete data privacy for personal photos, identification documents, and sensitive business receipts.
Need to change pixel dimensions or crop bounding boxes before compressing? Use our Image Resizer or bundle compressed pictures into a single document using our JPG to PDF Converter.
Lossy vs. Lossless Compression Explained
- Lossy Compression (JPEG & Lossy WebP): Selectively removes high-frequency color variations that the human eye cannot easily distinguish. This yields dramatic file reductions (up to 80%+) with negligible perceived quality loss.
- Lossless Compression (PNG & Lossless WebP): Eliminates redundant metadata (EXIF tags, GPS coordinates) and optimizes pixel Huffman tables without altering pixel color values. Ideal for sharp icons, logos, and technical blueprints.
- The Sweet Spot: Setting the compression quality slider between 75% and 85% achieves the optimal equilibrium between minimal byte weight and crisp image definition.
Perguntas Frequentes (FAQ)
As minhas imagens são enviadas para algum servidor?
Não. O processamento ocorre 100% no navegador do seu próprio celular ou computador via HTML5 Canvas. Suas fotos e documentos confidenciais nunca são salvos em servidores externos.
Como diminuir o tamanho da foto para menos de 50KB ou 100KB (ENEM e Concursos)?
Basta ajustar a barra de qualidade para cerca de 75% e reduzir a escala para 80%-90%. Isso reduz a contagem de pixels sem distorcer o rosto, atingindo o limite exato exigido por editais de concursos e do ENEM.
Quais tipos de arquivos são suportados?
Você pode comprimir fotos no formato JPEG (.jpg, .jpeg), PNG transparente e WebP.
Existe limite diário ou cobrança oculta?
Nenhum limite. Você pode comprimir quantas imagens desejar, sem necessidade de cadastro, sem marca d’água e 100% gratuito.