toololis
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Image Resizer

Resize images by pixels or percentage

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

Toololis 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. No 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?
No. 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?
Not currently — this tool processes one at a time for clarity. For batch operations, use the Image Compressor which supports multiple files.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.