Image Resizer — Free Online Tool
Resize images by pixels, percent or presets — sharp results. · No signup · Works on mobile
100% private: your files are processed in your browser. Nothing is uploaded to our servers.
How to use the image resizer
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Drop your image into the tool — its current dimensions are detected automatically.
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Enter a new width or height (the other side follows to keep proportions), a percentage, or pick a preset like "Instagram Post 1080×1080".
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Preview the result and download in your chosen format.
What does this tool do?
This free image resizer changes image dimensions by exact pixels, percentage, or one-click social media presets — Instagram post, YouTube thumbnail, Facebook cover, and more. Aspect ratio locks automatically to prevent distortion, and high-quality resampling keeps results sharp. Files never leave your browser.
How does the image resizer work?
Resizing uses the Canvas API with high-quality image smoothing; large downscales are performed in multiple 50% steps, which acts like proper multi-tap filtering and avoids the jagged aliasing single-step resizes produce. Output can be saved as JPG, PNG, or WebP.
Frequently Asked Questions
What are the standard social media image sizes?
The current staples: Instagram post 1080×1080 (square) or 1080×1350 (portrait), Instagram story 1080×1920, YouTube thumbnail 1280×720, Facebook cover 820×312, X/Twitter post 1600×900, LinkedIn post 1200×627, and og:image for link sharing 1200×630. All are one-click presets in this tool.
Will enlarging a small image make it blurry?
Somewhat — upscaling cannot create detail that was never captured, so a 2× enlargement will look slightly soft. Downscaling, by contrast, keeps images sharp. If you must enlarge, keep it under 1.5×, or start from the highest-resolution original you have.
What is the difference between resizing and compressing?
Resizing changes pixel dimensions (4000×3000 → 1200×900), which also reduces file size dramatically. Compressing keeps dimensions but re-encodes at lower quality. For web images, do both: resize to the display size you need, then compress — our image compressor is one click away.
Is the image resizer really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. No account or email needed. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Are my files private when using the image resizer?
Completely. The image resizer processes everything locally in your browser — your files are never uploaded to any server. When you close the tab, everything is gone. This makes it safe for confidential documents, client work, and personal photos.
Does the image resizer work on mobile phones?
Yes. It's built mobile-first and works on any modern phone browser — iPhone (Safari) and Android (Chrome) included. You can pick files straight from your camera roll and download results directly to your device.
Do I need to install any software to use the image resizer?
No. The image resizer runs entirely in your web browser — no downloads, extensions, or signup. Open the page, use the tool, download your result. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.