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Redimensionador de Imagens — Ferramenta online grátis

Redimensione imagens por pixels ou porcentagem

Redimensione imagens para qualquer dimensão. JPG, PNG, WebP suportados. Mantém a qualidade. Não navegador, sem cadastro.

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Free image resizer — by pixels or percent, aspect-ratio safe

Ferramentaolis Image Resizer changes image dimensions in your browser using the Canvas API. Input exact pixel dimensions or a percentage scale. Aspect-ratio lock keeps proportions correct automatically. Não upload to any server.

How to use this tool

  1. 1

    Upload your image

    Drop or pick a JPG, PNG, or WebP. The original dimensions will appear automatically.

  2. 2

    Enter target dimensions

    Type width, height, or a percentage. Aspect-ratio lock keeps proportions — toggle off to stretch.

  3. 3

    Download the resized image

    Canvas re-renders at the new size and gives you a download link. Quality is preserved for JPG/WebP output.

Common image sizes in 2026

  • Hero banner — 1920×1080
  • Blog featured / OG image — 1200×630
  • Instagram post (square) — 1080×1080
  • Instagram story — 1080×1920
  • LinkedIn banner — 1584×396
  • YouTube thumbnail — 1280×720
  • Favicon — 512×512 (for modern browsers)
  • Profile avatar — 400×400

Frequently Asked Questions

Does resizing reduce quality?
Downscaling (making smaller) barely reduces perceived quality — just fewer pixels. Upscaling (making larger) introduces blur because no new detail exists. For upscaling, use an AI upscaler tool instead.
What resampling algorithm is used?
The browser's built-in canvas rendering uses bilinear/bicubic interpolation automatically. It's the same algorithm Photoshop's "Bilinear" mode uses — good for most cases, preserves edges reasonably.
How is aspect ratio calculated?
From the source image's width-to-height ratio. When locked, changing width automatically updates height (and vice versa). Unlocking lets you stretch the image non-proportionally.
Is my image uploaded anywhere?
Não. Everything runs in your browser. Safe for private photos, ID scans, or confidential documents.
What are common image sizes?
Web hero: 1920×1080. Blog featured: 1200×630 (also Open Graph). Instagram post: 1080×1080. LinkedIn banner: 1584×396. YouTube thumbnail: 1280×720. Favicon: 512×512.
Can I resize multiple images at once?
Nãot currently — this tool processes one at a time for clarity. For batch operations, use the Image Compressor which supports multiple files.

Pontos-chave

  • Image Resizer is a free, browser-based image tool — resize images by pixels or percentage.
  • Não signup, no downloads, no file uploads. Ferramentas run in your browser; the few that need an outside service say so on the page.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Image Resizer

  1. Open the tool: Launch Image Resizer on Ferramentaolis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

Image Resizer — Quick Facts

Preço
Grátis — sem limites, sem marca d’água, sem paywall
Privacidade
Processado no seu navegador. Ferramentas que precisam de um serviço externo avisam isso na página. As visitas são contadas (Google Analytics).
Plataforma
Qualquer navegador moderno — desktop, tablet ou celular
Categoria
Image Ferramentas on Ferramentaolis
Offline
Works offline after first visit (Progressive Web App)
RecursoDetalhes
FerramentaImage Resizer
CategoriaImage
Cadastro necessárioNão
Upload de arquivoNenhum — processado no navegador
Suporte mobileTotalmente responsivo
CustoGrátis para sempre

Why Use Image Resizer?

You should try Image Resizer for a quick, private way to resize images by pixels or percentage. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacidade. Esta ferramenta funciona inteiramente no seu navegador. Seus dados nunca são enviados a nenhum servidor.